// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2018 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package repo

import (
	"bytes"
	stdCtx "context"
	"errors"
	"fmt"
	"math/big"
	"net/http"
	"net/url"
	"slices"
	"sort"
	"strconv"
	"strings"
	"time"

	activities_model "code.gitea.io/gitea/models/activities"
	"code.gitea.io/gitea/models/db"
	git_model "code.gitea.io/gitea/models/git"
	issues_model "code.gitea.io/gitea/models/issues"
	"code.gitea.io/gitea/models/organization"
	access_model "code.gitea.io/gitea/models/perm/access"
	project_model "code.gitea.io/gitea/models/project"
	pull_model "code.gitea.io/gitea/models/pull"
	repo_model "code.gitea.io/gitea/models/repo"
	"code.gitea.io/gitea/models/unit"
	user_model "code.gitea.io/gitea/models/user"
	"code.gitea.io/gitea/modules/base"
	"code.gitea.io/gitea/modules/container"
	"code.gitea.io/gitea/modules/emoji"
	"code.gitea.io/gitea/modules/git"
	issue_indexer "code.gitea.io/gitea/modules/indexer/issues"
	issue_template "code.gitea.io/gitea/modules/issue/template"
	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/markup"
	"code.gitea.io/gitea/modules/markup/markdown"
	"code.gitea.io/gitea/modules/optional"
	repo_module "code.gitea.io/gitea/modules/repository"
	"code.gitea.io/gitea/modules/setting"
	api "code.gitea.io/gitea/modules/structs"
	"code.gitea.io/gitea/modules/templates"
	"code.gitea.io/gitea/modules/templates/vars"
	"code.gitea.io/gitea/modules/timeutil"
	"code.gitea.io/gitea/modules/util"
	"code.gitea.io/gitea/modules/web"
	"code.gitea.io/gitea/routers/utils"
	asymkey_service "code.gitea.io/gitea/services/asymkey"
	"code.gitea.io/gitea/services/context"
	"code.gitea.io/gitea/services/context/upload"
	"code.gitea.io/gitea/services/convert"
	"code.gitea.io/gitea/services/forms"
	issue_service "code.gitea.io/gitea/services/issue"
	pull_service "code.gitea.io/gitea/services/pull"
	repo_service "code.gitea.io/gitea/services/repository"
)

const (
	tplAttachment base.TplName = "repo/issue/view_content/attachments"

	tplIssues      base.TplName = "repo/issue/list"
	tplIssueNew    base.TplName = "repo/issue/new"
	tplIssueChoose base.TplName = "repo/issue/choose"
	tplIssueView   base.TplName = "repo/issue/view"

	tplReactions base.TplName = "repo/issue/view_content/reactions"

	issueTemplateKey      = "IssueTemplate"
	issueTemplateTitleKey = "IssueTemplateTitle"
)

// IssueTemplateCandidates issue templates
var IssueTemplateCandidates = []string{
	"ISSUE_TEMPLATE.md",
	"ISSUE_TEMPLATE.yaml",
	"ISSUE_TEMPLATE.yml",
	"issue_template.md",
	"issue_template.yaml",
	"issue_template.yml",
	".gitea/ISSUE_TEMPLATE.md",
	".gitea/ISSUE_TEMPLATE.yaml",
	".gitea/ISSUE_TEMPLATE.yml",
	".gitea/issue_template.md",
	".gitea/issue_template.yaml",
	".gitea/issue_template.yml",
	".github/ISSUE_TEMPLATE.md",
	".github/ISSUE_TEMPLATE.yaml",
	".github/ISSUE_TEMPLATE.yml",
	".github/issue_template.md",
	".github/issue_template.yaml",
	".github/issue_template.yml",
}

// MustAllowUserComment checks to make sure if an issue is locked.
// If locked and user has permissions to write to the repository,
// then the comment is allowed, else it is blocked
func MustAllowUserComment(ctx *context.Context) {
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}

	if issue.IsLocked && !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) && !ctx.Doer.IsAdmin {
		ctx.Flash.Error(ctx.Tr("repo.issues.comment_on_locked"))
		ctx.Redirect(issue.Link())
		return
	}
}

// MustEnableIssues check if repository enable internal issues
func MustEnableIssues(ctx *context.Context) {
	if !ctx.Repo.CanRead(unit.TypeIssues) &&
		!ctx.Repo.CanRead(unit.TypeExternalTracker) {
		ctx.NotFound("MustEnableIssues", nil)
		return
	}

	unit, err := ctx.Repo.Repository.GetUnit(ctx, unit.TypeExternalTracker)
	if err == nil {
		ctx.Redirect(unit.ExternalTrackerConfig().ExternalTrackerURL)
		return
	}
}

// MustAllowPulls check if repository enable pull requests and user have right to do that
func MustAllowPulls(ctx *context.Context) {
	if !ctx.Repo.Repository.CanEnablePulls() || !ctx.Repo.CanRead(unit.TypePullRequests) {
		ctx.NotFound("MustAllowPulls", nil)
		return
	}

	// User can send pull request if owns a forked repository.
	if ctx.IsSigned && repo_model.HasForkedRepo(ctx, ctx.Doer.ID, ctx.Repo.Repository.ID) {
		ctx.Repo.PullRequest.Allowed = true
		ctx.Repo.PullRequest.HeadInfoSubURL = url.PathEscape(ctx.Doer.Name) + ":" + util.PathEscapeSegments(ctx.Repo.BranchName)
	}
}

func issues(ctx *context.Context, milestoneID, projectID int64, isPullOption util.OptionalBool) {
	var err error
	viewType := ctx.FormString("type")
	sortType := ctx.FormString("sort")
	types := []string{"all", "your_repositories", "assigned", "created_by", "mentioned", "review_requested", "reviewed_by"}
	if !util.SliceContainsString(types, viewType, true) {
		viewType = "all"
	}

	var (
		assigneeID        = ctx.FormInt64("assignee")
		posterID          = ctx.FormInt64("poster")
		mentionedID       int64
		reviewRequestedID int64
		reviewedID        int64
	)

	if ctx.IsSigned {
		switch viewType {
		case "created_by":
			posterID = ctx.Doer.ID
		case "mentioned":
			mentionedID = ctx.Doer.ID
		case "assigned":
			assigneeID = ctx.Doer.ID
		case "review_requested":
			reviewRequestedID = ctx.Doer.ID
		case "reviewed_by":
			reviewedID = ctx.Doer.ID
		}
	}

	repo := ctx.Repo.Repository
	var labelIDs []int64
	// 1,-2 means including label 1 and excluding label 2
	// 0 means issues with no label
	// blank means labels will not be filtered for issues
	selectLabels := ctx.FormString("labels")
	if selectLabels == "" {
		ctx.Data["AllLabels"] = true
	} else if selectLabels == "0" {
		ctx.Data["NoLabel"] = true
	}
	if len(selectLabels) > 0 {
		labelIDs, err = base.StringsToInt64s(strings.Split(selectLabels, ","))
		if err != nil {
			ctx.ServerError("StringsToInt64s", err)
			return
		}
	}

	keyword := strings.Trim(ctx.FormString("q"), " ")
	if bytes.Contains([]byte(keyword), []byte{0x00}) {
		keyword = ""
	}

	var mileIDs []int64
	if milestoneID > 0 || milestoneID == db.NoConditionID { // -1 to get those issues which have no any milestone assigned
		mileIDs = []int64{milestoneID}
	}

	var issueStats *issues_model.IssueStats
	statsOpts := &issues_model.IssuesOptions{
		RepoIDs:           []int64{repo.ID},
		LabelIDs:          labelIDs,
		MilestoneIDs:      mileIDs,
		ProjectID:         projectID,
		AssigneeID:        assigneeID,
		MentionedID:       mentionedID,
		PosterID:          posterID,
		ReviewRequestedID: reviewRequestedID,
		ReviewedID:        reviewedID,
		IsPull:            isPullOption,
		IssueIDs:          nil,
	}
	if keyword != "" {
		allIssueIDs, err := issueIDsFromSearch(ctx, keyword, statsOpts)
		if err != nil {
			if issue_indexer.IsAvailable(ctx) {
				ctx.ServerError("issueIDsFromSearch", err)
				return
			}
			ctx.Data["IssueIndexerUnavailable"] = true
			return
		}
		statsOpts.IssueIDs = allIssueIDs
	}
	if keyword != "" && len(statsOpts.IssueIDs) == 0 {
		// So it did search with the keyword, but no issue found.
		// Just set issueStats to empty.
		issueStats = &issues_model.IssueStats{}
	} else {
		// So it did search with the keyword, and found some issues. It needs to get issueStats of these issues.
		// Or the keyword is empty, so it doesn't need issueIDs as filter, just get issueStats with statsOpts.
		issueStats, err = issues_model.GetIssueStats(ctx, statsOpts)
		if err != nil {
			ctx.ServerError("GetIssueStats", err)
			return
		}
	}

	var isShowClosed util.OptionalBool
	switch ctx.FormString("state") {
	case "closed":
		isShowClosed = util.OptionalBoolTrue
	case "all":
		isShowClosed = util.OptionalBoolNone
	default:
		isShowClosed = util.OptionalBoolFalse
	}
	// if there are closed issues and no open issues, default to showing all issues
	if len(ctx.FormString("state")) == 0 && issueStats.OpenCount == 0 && issueStats.ClosedCount != 0 {
		isShowClosed = util.OptionalBoolNone
	}

	if repo.IsTimetrackerEnabled(ctx) {
		totalTrackedTime, err := issues_model.GetIssueTotalTrackedTime(ctx, statsOpts, isShowClosed)
		if err != nil {
			ctx.ServerError("GetIssueTotalTrackedTime", err)
			return
		}
		ctx.Data["TotalTrackedTime"] = totalTrackedTime
	}

	archived := ctx.FormBool("archived")

	page := ctx.FormInt("page")
	if page <= 1 {
		page = 1
	}

	var total int
	switch isShowClosed {
	case util.OptionalBoolTrue:
		total = int(issueStats.ClosedCount)
	case util.OptionalBoolNone:
		total = int(issueStats.OpenCount + issueStats.ClosedCount)
	default:
		total = int(issueStats.OpenCount)
	}
	pager := context.NewPagination(total, setting.UI.IssuePagingNum, page, 5)

	var issues issues_model.IssueList
	{
		ids, err := issueIDsFromSearch(ctx, keyword, &issues_model.IssuesOptions{
			Paginator: &db.ListOptions{
				Page:     pager.Paginater.Current(),
				PageSize: setting.UI.IssuePagingNum,
			},
			RepoIDs:           []int64{repo.ID},
			AssigneeID:        assigneeID,
			PosterID:          posterID,
			MentionedID:       mentionedID,
			ReviewRequestedID: reviewRequestedID,
			ReviewedID:        reviewedID,
			MilestoneIDs:      mileIDs,
			ProjectID:         projectID,
			IsClosed:          isShowClosed,
			IsPull:            isPullOption,
			LabelIDs:          labelIDs,
			SortType:          sortType,
		})
		if err != nil {
			if issue_indexer.IsAvailable(ctx) {
				ctx.ServerError("issueIDsFromSearch", err)
				return
			}
			ctx.Data["IssueIndexerUnavailable"] = true
			return
		}
		issues, err = issues_model.GetIssuesByIDs(ctx, ids, true)
		if err != nil {
			ctx.ServerError("GetIssuesByIDs", err)
			return
		}
	}

	approvalCounts, err := issues.GetApprovalCounts(ctx)
	if err != nil {
		ctx.ServerError("ApprovalCounts", err)
		return
	}

	// Get posters.
	for i := range issues {
		// Check read status
		if !ctx.IsSigned {
			issues[i].IsRead = true
		} else if err = issues[i].GetIsRead(ctx, ctx.Doer.ID); err != nil {
			ctx.ServerError("GetIsRead", err)
			return
		}
	}

	commitStatuses, lastStatus, err := pull_service.GetIssuesAllCommitStatus(ctx, issues)
	if err != nil {
		ctx.ServerError("GetIssuesAllCommitStatus", err)
		return
	}

	if err := issues.LoadAttributes(ctx); err != nil {
		ctx.ServerError("issues.LoadAttributes", err)
		return
	}

	ctx.Data["Issues"] = issues
	ctx.Data["CommitLastStatus"] = lastStatus
	ctx.Data["CommitStatuses"] = commitStatuses

	// Get assignees.
	assigneeUsers, err := repo_model.GetRepoAssignees(ctx, repo)
	if err != nil {
		ctx.ServerError("GetRepoAssignees", err)
		return
	}
	ctx.Data["Assignees"] = MakeSelfOnTop(ctx.Doer, assigneeUsers)

	handleTeamMentions(ctx)
	if ctx.Written() {
		return
	}

	labels, err := issues_model.GetLabelsByRepoID(ctx, repo.ID, "", db.ListOptions{})
	if err != nil {
		ctx.ServerError("GetLabelsByRepoID", err)
		return
	}

	if repo.Owner.IsOrganization() {
		orgLabels, err := issues_model.GetLabelsByOrgID(ctx, repo.Owner.ID, ctx.FormString("sort"), db.ListOptions{})
		if err != nil {
			ctx.ServerError("GetLabelsByOrgID", err)
			return
		}

		ctx.Data["OrgLabels"] = orgLabels
		labels = append(labels, orgLabels...)
	}

	// Get the exclusive scope for every label ID
	labelExclusiveScopes := make([]string, 0, len(labelIDs))
	for _, labelID := range labelIDs {
		foundExclusiveScope := false
		for _, label := range labels {
			if label.ID == labelID || label.ID == -labelID {
				labelExclusiveScopes = append(labelExclusiveScopes, label.ExclusiveScope())
				foundExclusiveScope = true
				break
			}
		}
		if !foundExclusiveScope {
			labelExclusiveScopes = append(labelExclusiveScopes, "")
		}
	}

	for _, l := range labels {
		l.LoadSelectedLabelsAfterClick(labelIDs, labelExclusiveScopes)
	}
	ctx.Data["Labels"] = labels
	ctx.Data["NumLabels"] = len(labels)

	if ctx.FormInt64("assignee") == 0 {
		assigneeID = 0 // Reset ID to prevent unexpected selection of assignee.
	}

	ctx.Data["IssueRefEndNames"], ctx.Data["IssueRefURLs"] = issue_service.GetRefEndNamesAndURLs(issues, ctx.Repo.RepoLink)

	ctx.Data["ApprovalCounts"] = func(issueID int64, typ string) int64 {
		counts, ok := approvalCounts[issueID]
		if !ok || len(counts) == 0 {
			return 0
		}
		reviewTyp := issues_model.ReviewTypeApprove
		if typ == "reject" {
			reviewTyp = issues_model.ReviewTypeReject
		} else if typ == "waiting" {
			reviewTyp = issues_model.ReviewTypeRequest
		}
		for _, count := range counts {
			if count.Type == reviewTyp {
				return count.Count
			}
		}
		return 0
	}

	retrieveProjects(ctx, repo)
	if ctx.Written() {
		return
	}

	pinned, err := issues_model.GetPinnedIssues(ctx, repo.ID, isPullOption.IsTrue())
	if err != nil {
		ctx.ServerError("GetPinnedIssues", err)
		return
	}

	ctx.Data["PinnedIssues"] = pinned
	ctx.Data["IsRepoAdmin"] = ctx.IsSigned && (ctx.Repo.IsAdmin() || ctx.Doer.IsAdmin)
	ctx.Data["IssueStats"] = issueStats
	ctx.Data["OpenCount"] = issueStats.OpenCount
	ctx.Data["ClosedCount"] = issueStats.ClosedCount
	linkStr := "%s?q=%s&type=%s&sort=%s&state=%s&labels=%s&milestone=%d&project=%d&assignee=%d&poster=%d&archived=%t"
	ctx.Data["AllStatesLink"] = fmt.Sprintf(linkStr, ctx.Link,
		url.QueryEscape(keyword), url.QueryEscape(viewType), url.QueryEscape(sortType), "all", url.QueryEscape(selectLabels),
		mentionedID, projectID, assigneeID, posterID, archived)
	ctx.Data["OpenLink"] = fmt.Sprintf(linkStr, ctx.Link,
		url.QueryEscape(keyword), url.QueryEscape(viewType), url.QueryEscape(sortType), "open", url.QueryEscape(selectLabels),
		mentionedID, projectID, assigneeID, posterID, archived)
	ctx.Data["ClosedLink"] = fmt.Sprintf(linkStr, ctx.Link,
		url.QueryEscape(keyword), url.QueryEscape(viewType), url.QueryEscape(sortType), "closed", url.QueryEscape(selectLabels),
		mentionedID, projectID, assigneeID, posterID, archived)
	ctx.Data["SelLabelIDs"] = labelIDs
	ctx.Data["SelectLabels"] = selectLabels
	ctx.Data["ViewType"] = viewType
	ctx.Data["SortType"] = sortType
	ctx.Data["MilestoneID"] = milestoneID
	ctx.Data["ProjectID"] = projectID
	ctx.Data["AssigneeID"] = assigneeID
	ctx.Data["PosterID"] = posterID
	ctx.Data["Keyword"] = keyword
	switch isShowClosed {
	case util.OptionalBoolTrue:
		ctx.Data["State"] = "closed"
	case util.OptionalBoolNone:
		ctx.Data["State"] = "all"
	default:
		ctx.Data["State"] = "open"
	}
	ctx.Data["ShowArchivedLabels"] = archived

	pager.AddParam(ctx, "q", "Keyword")
	pager.AddParam(ctx, "type", "ViewType")
	pager.AddParam(ctx, "sort", "SortType")
	pager.AddParam(ctx, "state", "State")
	pager.AddParam(ctx, "labels", "SelectLabels")
	pager.AddParam(ctx, "milestone", "MilestoneID")
	pager.AddParam(ctx, "project", "ProjectID")
	pager.AddParam(ctx, "assignee", "AssigneeID")
	pager.AddParam(ctx, "poster", "PosterID")
	pager.AddParam(ctx, "archived", "ShowArchivedLabels")

	ctx.Data["Page"] = pager
}

func issueIDsFromSearch(ctx *context.Context, keyword string, opts *issues_model.IssuesOptions) ([]int64, error) {
	ids, _, err := issue_indexer.SearchIssues(ctx, issue_indexer.ToSearchOptions(keyword, opts))
	if err != nil {
		return nil, fmt.Errorf("SearchIssues: %w", err)
	}
	return ids, nil
}

// Issues render issues page
func Issues(ctx *context.Context) {
	isPullList := ctx.Params(":type") == "pulls"
	if isPullList {
		MustAllowPulls(ctx)
		if ctx.Written() {
			return
		}
		ctx.Data["Title"] = ctx.Tr("repo.pulls")
		ctx.Data["PageIsPullList"] = true
	} else {
		MustEnableIssues(ctx)
		if ctx.Written() {
			return
		}
		ctx.Data["Title"] = ctx.Tr("repo.issues")
		ctx.Data["PageIsIssueList"] = true
		ctx.Data["NewIssueChooseTemplate"] = issue_service.HasTemplatesOrContactLinks(ctx.Repo.Repository, ctx.Repo.GitRepo)
	}

	issues(ctx, ctx.FormInt64("milestone"), ctx.FormInt64("project"), util.OptionalBoolOf(isPullList))
	if ctx.Written() {
		return
	}

	renderMilestones(ctx)
	if ctx.Written() {
		return
	}

	ctx.Data["CanWriteIssuesOrPulls"] = ctx.Repo.CanWriteIssuesOrPulls(isPullList)

	ctx.HTML(http.StatusOK, tplIssues)
}

func renderMilestones(ctx *context.Context) {
	// Get milestones
	milestones, err := db.Find[issues_model.Milestone](ctx, issues_model.FindMilestoneOptions{
		RepoID: ctx.Repo.Repository.ID,
	})
	if err != nil {
		ctx.ServerError("GetAllRepoMilestones", err)
		return
	}

	openMilestones, closedMilestones := issues_model.MilestoneList{}, issues_model.MilestoneList{}
	for _, milestone := range milestones {
		if milestone.IsClosed {
			closedMilestones = append(closedMilestones, milestone)
		} else {
			openMilestones = append(openMilestones, milestone)
		}
	}
	ctx.Data["OpenMilestones"] = openMilestones
	ctx.Data["ClosedMilestones"] = closedMilestones
}

// RetrieveRepoMilestonesAndAssignees find all the milestones and assignees of a repository
func RetrieveRepoMilestonesAndAssignees(ctx *context.Context, repo *repo_model.Repository) {
	var err error
	ctx.Data["OpenMilestones"], err = db.Find[issues_model.Milestone](ctx, issues_model.FindMilestoneOptions{
		RepoID:   repo.ID,
		IsClosed: util.OptionalBoolFalse,
	})
	if err != nil {
		ctx.ServerError("GetMilestones", err)
		return
	}
	ctx.Data["ClosedMilestones"], err = db.Find[issues_model.Milestone](ctx, issues_model.FindMilestoneOptions{
		RepoID:   repo.ID,
		IsClosed: util.OptionalBoolTrue,
	})
	if err != nil {
		ctx.ServerError("GetMilestones", err)
		return
	}

	assigneeUsers, err := repo_model.GetRepoAssignees(ctx, repo)
	if err != nil {
		ctx.ServerError("GetRepoAssignees", err)
		return
	}
	ctx.Data["Assignees"] = MakeSelfOnTop(ctx.Doer, assigneeUsers)

	handleTeamMentions(ctx)
}

func retrieveProjects(ctx *context.Context, repo *repo_model.Repository) {
	// Distinguish whether the owner of the repository
	// is an individual or an organization
	repoOwnerType := project_model.TypeIndividual
	if repo.Owner.IsOrganization() {
		repoOwnerType = project_model.TypeOrganization
	}
	var err error
	projects, err := db.Find[project_model.Project](ctx, project_model.SearchOptions{
		ListOptions: db.ListOptionsAll,
		RepoID:      repo.ID,
		IsClosed:    util.OptionalBoolFalse,
		Type:        project_model.TypeRepository,
	})
	if err != nil {
		ctx.ServerError("GetProjects", err)
		return
	}
	projects2, err := db.Find[project_model.Project](ctx, project_model.SearchOptions{
		ListOptions: db.ListOptionsAll,
		OwnerID:     repo.OwnerID,
		IsClosed:    util.OptionalBoolFalse,
		Type:        repoOwnerType,
	})
	if err != nil {
		ctx.ServerError("GetProjects", err)
		return
	}

	ctx.Data["OpenProjects"] = append(projects, projects2...)

	projects, err = db.Find[project_model.Project](ctx, project_model.SearchOptions{
		ListOptions: db.ListOptionsAll,
		RepoID:      repo.ID,
		IsClosed:    util.OptionalBoolTrue,
		Type:        project_model.TypeRepository,
	})
	if err != nil {
		ctx.ServerError("GetProjects", err)
		return
	}
	projects2, err = db.Find[project_model.Project](ctx, project_model.SearchOptions{
		ListOptions: db.ListOptionsAll,
		OwnerID:     repo.OwnerID,
		IsClosed:    util.OptionalBoolTrue,
		Type:        repoOwnerType,
	})
	if err != nil {
		ctx.ServerError("GetProjects", err)
		return
	}

	ctx.Data["ClosedProjects"] = append(projects, projects2...)
}

// repoReviewerSelection items to bee shown
type repoReviewerSelection struct {
	IsTeam    bool
	Team      *organization.Team
	User      *user_model.User
	Review    *issues_model.Review
	CanChange bool
	Checked   bool
	ItemID    int64
}

// RetrieveRepoReviewers find all reviewers of a repository
func RetrieveRepoReviewers(ctx *context.Context, repo *repo_model.Repository, issue *issues_model.Issue, canChooseReviewer bool) {
	ctx.Data["CanChooseReviewer"] = canChooseReviewer

	originalAuthorReviews, err := issues_model.GetReviewersFromOriginalAuthorsByIssueID(ctx, issue.ID)
	if err != nil {
		ctx.ServerError("GetReviewersFromOriginalAuthorsByIssueID", err)
		return
	}
	ctx.Data["OriginalReviews"] = originalAuthorReviews

	reviews, err := issues_model.GetReviewsByIssueID(ctx, issue.ID)
	if err != nil {
		ctx.ServerError("GetReviewersByIssueID", err)
		return
	}

	if len(reviews) == 0 && !canChooseReviewer {
		return
	}

	var (
		pullReviews         []*repoReviewerSelection
		reviewersResult     []*repoReviewerSelection
		teamReviewersResult []*repoReviewerSelection
		teamReviewers       []*organization.Team
		reviewers           []*user_model.User
	)

	if canChooseReviewer {
		posterID := issue.PosterID
		if issue.OriginalAuthorID > 0 {
			posterID = 0
		}

		reviewers, err = repo_model.GetReviewers(ctx, repo, ctx.Doer.ID, posterID)
		if err != nil {
			ctx.ServerError("GetReviewers", err)
			return
		}

		teamReviewers, err = repo_service.GetReviewerTeams(ctx, repo)
		if err != nil {
			ctx.ServerError("GetReviewerTeams", err)
			return
		}

		if len(reviewers) > 0 {
			reviewersResult = make([]*repoReviewerSelection, 0, len(reviewers))
		}

		if len(teamReviewers) > 0 {
			teamReviewersResult = make([]*repoReviewerSelection, 0, len(teamReviewers))
		}
	}

	pullReviews = make([]*repoReviewerSelection, 0, len(reviews))

	for _, review := range reviews {
		tmp := &repoReviewerSelection{
			Checked: review.Type == issues_model.ReviewTypeRequest,
			Review:  review,
			ItemID:  review.ReviewerID,
		}
		if review.ReviewerTeamID > 0 {
			tmp.IsTeam = true
			tmp.ItemID = -review.ReviewerTeamID
		}

		if canChooseReviewer {
			// Users who can choose reviewers can also remove review requests
			tmp.CanChange = true
		} else if ctx.Doer != nil && ctx.Doer.ID == review.ReviewerID && review.Type == issues_model.ReviewTypeRequest {
			// A user can refuse review requests
			tmp.CanChange = true
		}

		pullReviews = append(pullReviews, tmp)

		if canChooseReviewer {
			if tmp.IsTeam {
				teamReviewersResult = append(teamReviewersResult, tmp)
			} else {
				reviewersResult = append(reviewersResult, tmp)
			}
		}
	}

	if len(pullReviews) > 0 {
		// Drop all non-existing users and teams from the reviews
		currentPullReviewers := make([]*repoReviewerSelection, 0, len(pullReviews))
		for _, item := range pullReviews {
			if item.Review.ReviewerID > 0 {
				if err = item.Review.LoadReviewer(ctx); err != nil {
					if user_model.IsErrUserNotExist(err) {
						continue
					}
					ctx.ServerError("LoadReviewer", err)
					return
				}
				item.User = item.Review.Reviewer
			} else if item.Review.ReviewerTeamID > 0 {
				if err = item.Review.LoadReviewerTeam(ctx); err != nil {
					if organization.IsErrTeamNotExist(err) {
						continue
					}
					ctx.ServerError("LoadReviewerTeam", err)
					return
				}
				item.Team = item.Review.ReviewerTeam
			} else {
				continue
			}

			currentPullReviewers = append(currentPullReviewers, item)
		}
		ctx.Data["PullReviewers"] = currentPullReviewers
	}

	if canChooseReviewer && reviewersResult != nil {
		preadded := len(reviewersResult)
		for _, reviewer := range reviewers {
			found := false
		reviewAddLoop:
			for _, tmp := range reviewersResult[:preadded] {
				if tmp.ItemID == reviewer.ID {
					tmp.User = reviewer
					found = true
					break reviewAddLoop
				}
			}

			if found {
				continue
			}

			reviewersResult = append(reviewersResult, &repoReviewerSelection{
				IsTeam:    false,
				CanChange: true,
				User:      reviewer,
				ItemID:    reviewer.ID,
			})
		}

		ctx.Data["Reviewers"] = reviewersResult
	}

	if canChooseReviewer && teamReviewersResult != nil {
		preadded := len(teamReviewersResult)
		for _, team := range teamReviewers {
			found := false
		teamReviewAddLoop:
			for _, tmp := range teamReviewersResult[:preadded] {
				if tmp.ItemID == -team.ID {
					tmp.Team = team
					found = true
					break teamReviewAddLoop
				}
			}

			if found {
				continue
			}

			teamReviewersResult = append(teamReviewersResult, &repoReviewerSelection{
				IsTeam:    true,
				CanChange: true,
				Team:      team,
				ItemID:    -team.ID,
			})
		}

		ctx.Data["TeamReviewers"] = teamReviewersResult
	}
}

// RetrieveRepoMetas find all the meta information of a repository
func RetrieveRepoMetas(ctx *context.Context, repo *repo_model.Repository, isPull bool) []*issues_model.Label {
	if !ctx.Repo.CanWriteIssuesOrPulls(isPull) {
		return nil
	}

	labels, err := issues_model.GetLabelsByRepoID(ctx, repo.ID, "", db.ListOptions{})
	if err != nil {
		ctx.ServerError("GetLabelsByRepoID", err)
		return nil
	}
	ctx.Data["Labels"] = labels
	if repo.Owner.IsOrganization() {
		orgLabels, err := issues_model.GetLabelsByOrgID(ctx, repo.Owner.ID, ctx.FormString("sort"), db.ListOptions{})
		if err != nil {
			return nil
		}

		ctx.Data["OrgLabels"] = orgLabels
		labels = append(labels, orgLabels...)
	}

	RetrieveRepoMilestonesAndAssignees(ctx, repo)
	if ctx.Written() {
		return nil
	}

	retrieveProjects(ctx, repo)
	if ctx.Written() {
		return nil
	}

	PrepareBranchList(ctx)
	if ctx.Written() {
		return nil
	}

	// Contains true if the user can create issue dependencies
	ctx.Data["CanCreateIssueDependencies"] = ctx.Repo.CanCreateIssueDependencies(ctx, ctx.Doer, isPull)

	return labels
}

// Tries to load and set an issue template. The first return value indicates if a template was loaded.
func setTemplateIfExists(ctx *context.Context, ctxDataKey string, possibleFiles []string) (bool, map[string]error) {
	commit, err := ctx.Repo.GitRepo.GetBranchCommit(ctx.Repo.Repository.DefaultBranch)
	if err != nil {
		return false, nil
	}

	templateCandidates := make([]string, 0, 1+len(possibleFiles))
	if t := ctx.FormString("template"); t != "" {
		templateCandidates = append(templateCandidates, t)
	}
	templateCandidates = append(templateCandidates, possibleFiles...) // Append files to the end because they should be fallback

	templateErrs := map[string]error{}
	for _, filename := range templateCandidates {
		if ok, _ := commit.HasFile(filename); !ok {
			continue
		}
		template, err := issue_template.UnmarshalFromCommit(commit, filename)
		if err != nil {
			templateErrs[filename] = err
			continue
		}
		ctx.Data[issueTemplateTitleKey] = template.Title
		ctx.Data[ctxDataKey] = template.Content

		if template.Type() == api.IssueTemplateTypeYaml {
			// Replace field default values by values from query
			for _, field := range template.Fields {
				fieldValue := ctx.FormString("field:" + field.ID)
				if fieldValue != "" {
					field.Attributes["value"] = fieldValue
				}
			}

			ctx.Data["Fields"] = template.Fields
			ctx.Data["TemplateFile"] = template.FileName
		}
		labelIDs := make([]string, 0, len(template.Labels))
		if repoLabels, err := issues_model.GetLabelsByRepoID(ctx, ctx.Repo.Repository.ID, "", db.ListOptions{}); err == nil {
			ctx.Data["Labels"] = repoLabels
			if ctx.Repo.Owner.IsOrganization() {
				if orgLabels, err := issues_model.GetLabelsByOrgID(ctx, ctx.Repo.Owner.ID, ctx.FormString("sort"), db.ListOptions{}); err == nil {
					ctx.Data["OrgLabels"] = orgLabels
					repoLabels = append(repoLabels, orgLabels...)
				}
			}

			for _, metaLabel := range template.Labels {
				for _, repoLabel := range repoLabels {
					if strings.EqualFold(repoLabel.Name, metaLabel) {
						repoLabel.IsChecked = true
						labelIDs = append(labelIDs, strconv.FormatInt(repoLabel.ID, 10))
						break
					}
				}
			}

		}

		if template.Ref != "" && !strings.HasPrefix(template.Ref, "refs/") { // Assume that the ref intended is always a branch - for tags users should use refs/tags/<ref>
			template.Ref = git.BranchPrefix + template.Ref
		}
		ctx.Data["HasSelectedLabel"] = len(labelIDs) > 0
		ctx.Data["label_ids"] = strings.Join(labelIDs, ",")
		ctx.Data["Reference"] = template.Ref
		ctx.Data["RefEndName"] = git.RefName(template.Ref).ShortName()
		return true, templateErrs
	}
	return false, templateErrs
}

// NewIssue render creating issue page
func NewIssue(ctx *context.Context) {
	issueConfig, _ := issue_service.GetTemplateConfigFromDefaultBranch(ctx.Repo.Repository, ctx.Repo.GitRepo)
	hasTemplates := issue_service.HasTemplatesOrContactLinks(ctx.Repo.Repository, ctx.Repo.GitRepo)

	ctx.Data["Title"] = ctx.Tr("repo.issues.new")
	ctx.Data["PageIsIssueList"] = true
	ctx.Data["NewIssueChooseTemplate"] = hasTemplates
	ctx.Data["PullRequestWorkInProgressPrefixes"] = setting.Repository.PullRequest.WorkInProgressPrefixes
	title := ctx.FormString("title")
	ctx.Data["TitleQuery"] = title
	body := ctx.FormString("body")
	ctx.Data["BodyQuery"] = body

	isProjectsEnabled := ctx.Repo.CanRead(unit.TypeProjects)
	ctx.Data["IsProjectsEnabled"] = isProjectsEnabled
	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
	upload.AddUploadContext(ctx, "comment")

	milestoneID := ctx.FormInt64("milestone")
	if milestoneID > 0 {
		milestone, err := issues_model.GetMilestoneByRepoID(ctx, ctx.Repo.Repository.ID, milestoneID)
		if err != nil {
			log.Error("GetMilestoneByID: %d: %v", milestoneID, err)
		} else {
			ctx.Data["milestone_id"] = milestoneID
			ctx.Data["Milestone"] = milestone
		}
	}

	projectID := ctx.FormInt64("project")
	if projectID > 0 && isProjectsEnabled {
		project, err := project_model.GetProjectByID(ctx, projectID)
		if err != nil {
			log.Error("GetProjectByID: %d: %v", projectID, err)
		} else if project.RepoID != ctx.Repo.Repository.ID {
			log.Error("GetProjectByID: %d: %v", projectID, fmt.Errorf("project[%d] not in repo [%d]", project.ID, ctx.Repo.Repository.ID))
		} else {
			ctx.Data["project_id"] = projectID
			ctx.Data["Project"] = project
		}

		if len(ctx.Req.URL.Query().Get("project")) > 0 {
			ctx.Data["redirect_after_creation"] = "project"
		}
	}

	RetrieveRepoMetas(ctx, ctx.Repo.Repository, false)

	tags, err := repo_model.GetTagNamesByRepoID(ctx, ctx.Repo.Repository.ID)
	if err != nil {
		ctx.ServerError("GetTagNamesByRepoID", err)
		return
	}
	ctx.Data["Tags"] = tags

	ret := issue_service.ParseTemplatesFromDefaultBranch(ctx.Repo.Repository, ctx.Repo.GitRepo)
	templateLoaded, errs := setTemplateIfExists(ctx, issueTemplateKey, IssueTemplateCandidates)
	for k, v := range errs {
		ret.TemplateErrors[k] = v
	}
	if ctx.Written() {
		return
	}

	if len(ret.TemplateErrors) > 0 {
		ctx.Flash.Warning(renderErrorOfTemplates(ctx, ret.TemplateErrors), true)
	}

	ctx.Data["HasIssuesOrPullsWritePermission"] = ctx.Repo.CanWrite(unit.TypeIssues)

	if !issueConfig.BlankIssuesEnabled && hasTemplates && !templateLoaded {
		// The "issues/new" and "issues/new/choose" share the same query parameters "project" and "milestone", if blank issues are disabled, just redirect to the "issues/choose" page with these parameters.
		ctx.Redirect(fmt.Sprintf("%s/issues/new/choose?%s", ctx.Repo.Repository.Link(), ctx.Req.URL.RawQuery), http.StatusSeeOther)
		return
	}

	ctx.HTML(http.StatusOK, tplIssueNew)
}

func renderErrorOfTemplates(ctx *context.Context, errs map[string]error) string {
	var files []string
	for k := range errs {
		files = append(files, k)
	}
	sort.Strings(files) // keep the output stable

	var lines []string
	for _, file := range files {
		lines = append(lines, fmt.Sprintf("%s: %v", file, errs[file]))
	}

	flashError, err := ctx.RenderToString(tplAlertDetails, map[string]any{
		"Message": ctx.Tr("repo.issues.choose.ignore_invalid_templates"),
		"Summary": ctx.Tr("repo.issues.choose.invalid_templates", len(errs)),
		"Details": utils.SanitizeFlashErrorString(strings.Join(lines, "\n")),
	})
	if err != nil {
		log.Debug("render flash error: %v", err)
		flashError = ctx.Locale.TrString("repo.issues.choose.ignore_invalid_templates")
	}
	return flashError
}

// NewIssueChooseTemplate render creating issue from template page
func NewIssueChooseTemplate(ctx *context.Context) {
	ctx.Data["Title"] = ctx.Tr("repo.issues.new")
	ctx.Data["PageIsIssueList"] = true

	ret := issue_service.ParseTemplatesFromDefaultBranch(ctx.Repo.Repository, ctx.Repo.GitRepo)
	ctx.Data["IssueTemplates"] = ret.IssueTemplates

	if len(ret.TemplateErrors) > 0 {
		ctx.Flash.Warning(renderErrorOfTemplates(ctx, ret.TemplateErrors), true)
	}

	if !issue_service.HasTemplatesOrContactLinks(ctx.Repo.Repository, ctx.Repo.GitRepo) {
		// The "issues/new" and "issues/new/choose" share the same query parameters "project" and "milestone", if no template here, just redirect to the "issues/new" page with these parameters.
		ctx.Redirect(fmt.Sprintf("%s/issues/new?%s", ctx.Repo.Repository.Link(), ctx.Req.URL.RawQuery), http.StatusSeeOther)
		return
	}

	issueConfig, err := issue_service.GetTemplateConfigFromDefaultBranch(ctx.Repo.Repository, ctx.Repo.GitRepo)
	ctx.Data["IssueConfig"] = issueConfig
	ctx.Data["IssueConfigError"] = err // ctx.Flash.Err makes problems here

	ctx.Data["milestone"] = ctx.FormInt64("milestone")
	ctx.Data["project"] = ctx.FormInt64("project")

	ctx.HTML(http.StatusOK, tplIssueChoose)
}

// DeleteIssue deletes an issue
func DeleteIssue(ctx *context.Context) {
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}

	if err := issue_service.DeleteIssue(ctx, ctx.Doer, ctx.Repo.GitRepo, issue); err != nil {
		ctx.ServerError("DeleteIssueByID", err)
		return
	}

	if issue.IsPull {
		ctx.Redirect(fmt.Sprintf("%s/pulls", ctx.Repo.Repository.Link()), http.StatusSeeOther)
		return
	}

	ctx.Redirect(fmt.Sprintf("%s/issues", ctx.Repo.Repository.Link()), http.StatusSeeOther)
}

// ValidateRepoMetas check and returns repository's meta information
func ValidateRepoMetas(ctx *context.Context, form forms.CreateIssueForm, isPull bool) ([]int64, []int64, int64, int64) {
	var (
		repo = ctx.Repo.Repository
		err  error
	)

	labels := RetrieveRepoMetas(ctx, ctx.Repo.Repository, isPull)
	if ctx.Written() {
		return nil, nil, 0, 0
	}

	var labelIDs []int64
	hasSelected := false
	// Check labels.
	if len(form.LabelIDs) > 0 {
		labelIDs, err = base.StringsToInt64s(strings.Split(form.LabelIDs, ","))
		if err != nil {
			return nil, nil, 0, 0
		}
		labelIDMark := make(container.Set[int64])
		labelIDMark.AddMultiple(labelIDs...)

		for i := range labels {
			if labelIDMark.Contains(labels[i].ID) {
				labels[i].IsChecked = true
				hasSelected = true
			}
		}
	}

	ctx.Data["Labels"] = labels
	ctx.Data["HasSelectedLabel"] = hasSelected
	ctx.Data["label_ids"] = form.LabelIDs

	// Check milestone.
	milestoneID := form.MilestoneID
	if milestoneID > 0 {
		milestone, err := issues_model.GetMilestoneByRepoID(ctx, ctx.Repo.Repository.ID, milestoneID)
		if err != nil {
			ctx.ServerError("GetMilestoneByID", err)
			return nil, nil, 0, 0
		}
		if milestone.RepoID != repo.ID {
			ctx.ServerError("GetMilestoneByID", err)
			return nil, nil, 0, 0
		}
		ctx.Data["Milestone"] = milestone
		ctx.Data["milestone_id"] = milestoneID
	}

	if form.ProjectID > 0 {
		p, err := project_model.GetProjectByID(ctx, form.ProjectID)
		if err != nil {
			ctx.ServerError("GetProjectByID", err)
			return nil, nil, 0, 0
		}
		if p.RepoID != ctx.Repo.Repository.ID && p.OwnerID != ctx.Repo.Repository.OwnerID {
			ctx.NotFound("", nil)
			return nil, nil, 0, 0
		}

		ctx.Data["Project"] = p
		ctx.Data["project_id"] = form.ProjectID
	}

	// Check assignees
	var assigneeIDs []int64
	if len(form.AssigneeIDs) > 0 {
		assigneeIDs, err = base.StringsToInt64s(strings.Split(form.AssigneeIDs, ","))
		if err != nil {
			return nil, nil, 0, 0
		}

		// Check if the passed assignees actually exists and is assignable
		for _, aID := range assigneeIDs {
			assignee, err := user_model.GetUserByID(ctx, aID)
			if err != nil {
				ctx.ServerError("GetUserByID", err)
				return nil, nil, 0, 0
			}

			valid, err := access_model.CanBeAssigned(ctx, assignee, repo, isPull)
			if err != nil {
				ctx.ServerError("CanBeAssigned", err)
				return nil, nil, 0, 0
			}

			if !valid {
				ctx.ServerError("canBeAssigned", repo_model.ErrUserDoesNotHaveAccessToRepo{UserID: aID, RepoName: repo.Name})
				return nil, nil, 0, 0
			}
		}
	}

	// Keep the old assignee id thingy for compatibility reasons
	if form.AssigneeID > 0 {
		assigneeIDs = append(assigneeIDs, form.AssigneeID)
	}

	return labelIDs, assigneeIDs, milestoneID, form.ProjectID
}

// NewIssuePost response for creating new issue
func NewIssuePost(ctx *context.Context) {
	form := web.GetForm(ctx).(*forms.CreateIssueForm)
	ctx.Data["Title"] = ctx.Tr("repo.issues.new")
	ctx.Data["PageIsIssueList"] = true
	ctx.Data["NewIssueChooseTemplate"] = issue_service.HasTemplatesOrContactLinks(ctx.Repo.Repository, ctx.Repo.GitRepo)
	ctx.Data["PullRequestWorkInProgressPrefixes"] = setting.Repository.PullRequest.WorkInProgressPrefixes
	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
	upload.AddUploadContext(ctx, "comment")

	var (
		repo        = ctx.Repo.Repository
		attachments []string
	)

	labelIDs, assigneeIDs, milestoneID, projectID := ValidateRepoMetas(ctx, *form, false)
	if ctx.Written() {
		return
	}

	if setting.Attachment.Enabled {
		attachments = form.Files
	}

	if ctx.HasError() {
		ctx.JSONError(ctx.GetErrMsg())
		return
	}

	if util.IsEmptyString(form.Title) {
		ctx.JSONError(ctx.Tr("repo.issues.new.title_empty"))
		return
	}

	content := form.Content
	if filename := ctx.Req.Form.Get("template-file"); filename != "" {
		if template, err := issue_template.UnmarshalFromRepo(ctx.Repo.GitRepo, ctx.Repo.Repository.DefaultBranch, filename); err == nil {
			content = issue_template.RenderToMarkdown(template, ctx.Req.Form)
		}
	}

	issue := &issues_model.Issue{
		RepoID:      repo.ID,
		Repo:        repo,
		Title:       form.Title,
		PosterID:    ctx.Doer.ID,
		Poster:      ctx.Doer,
		MilestoneID: milestoneID,
		Content:     content,
		Ref:         form.Ref,
	}

	if err := issue_service.NewIssue(ctx, repo, issue, labelIDs, attachments, assigneeIDs); err != nil {
		if repo_model.IsErrUserDoesNotHaveAccessToRepo(err) {
			ctx.Error(http.StatusBadRequest, "UserDoesNotHaveAccessToRepo", err.Error())
			return
		}
		ctx.ServerError("NewIssue", err)
		return
	}

	if projectID > 0 {
		if !ctx.Repo.CanRead(unit.TypeProjects) {
			// User must also be able to see the project.
			ctx.Error(http.StatusBadRequest, "user hasn't permissions to read projects")
			return
		}
		if err := issues_model.ChangeProjectAssign(ctx, issue, ctx.Doer, projectID); err != nil {
			ctx.ServerError("ChangeProjectAssign", err)
			return
		}
	}

	log.Trace("Issue created: %d/%d", repo.ID, issue.ID)
	if ctx.FormString("redirect_after_creation") == "project" && projectID > 0 {
		ctx.JSONRedirect(ctx.Repo.RepoLink + "/projects/" + strconv.FormatInt(projectID, 10))
	} else {
		ctx.JSONRedirect(issue.Link())
	}
}

// roleDescriptor returns the role descriptor for a comment in/with the given repo, poster and issue
func roleDescriptor(ctx stdCtx.Context, repo *repo_model.Repository, poster *user_model.User, issue *issues_model.Issue, hasOriginalAuthor bool) (issues_model.RoleDescriptor, error) {
	roleDescriptor := issues_model.RoleDescriptor{}

	if hasOriginalAuthor {
		return roleDescriptor, nil
	}

	perm, err := access_model.GetUserRepoPermission(ctx, repo, poster)
	if err != nil {
		return roleDescriptor, err
	}

	// If the poster is the actual poster of the issue, enable Poster role.
	roleDescriptor.IsPoster = issue.IsPoster(poster.ID)

	// Check if the poster is owner of the repo.
	if perm.IsOwner() {
		// If the poster isn't an admin, enable the owner role.
		if !poster.IsAdmin {
			roleDescriptor.RoleInRepo = issues_model.RoleRepoOwner
			return roleDescriptor, nil
		}

		// Otherwise check if poster is the real repo admin.
		ok, err := access_model.IsUserRealRepoAdmin(ctx, repo, poster)
		if err != nil {
			return roleDescriptor, err
		}
		if ok {
			roleDescriptor.RoleInRepo = issues_model.RoleRepoOwner
			return roleDescriptor, nil
		}
	}

	// If repo is organization, check Member role
	if err := repo.LoadOwner(ctx); err != nil {
		return roleDescriptor, err
	}
	if repo.Owner.IsOrganization() {
		if isMember, err := organization.IsOrganizationMember(ctx, repo.Owner.ID, poster.ID); err != nil {
			return roleDescriptor, err
		} else if isMember {
			roleDescriptor.RoleInRepo = issues_model.RoleRepoMember
			return roleDescriptor, nil
		}
	}

	// If the poster is the collaborator of the repo
	if isCollaborator, err := repo_model.IsCollaborator(ctx, repo.ID, poster.ID); err != nil {
		return roleDescriptor, err
	} else if isCollaborator {
		roleDescriptor.RoleInRepo = issues_model.RoleRepoCollaborator
		return roleDescriptor, nil
	}

	hasMergedPR, err := issues_model.HasMergedPullRequestInRepo(ctx, repo.ID, poster.ID)
	if err != nil {
		return roleDescriptor, err
	} else if hasMergedPR {
		roleDescriptor.RoleInRepo = issues_model.RoleRepoContributor
	} else if issue.IsPull {
		// only display first time contributor in the first opening pull request
		roleDescriptor.RoleInRepo = issues_model.RoleRepoFirstTimeContributor
	}

	return roleDescriptor, nil
}

func getBranchData(ctx *context.Context, issue *issues_model.Issue) {
	ctx.Data["BaseBranch"] = nil
	ctx.Data["HeadBranch"] = nil
	ctx.Data["HeadUserName"] = nil
	ctx.Data["BaseName"] = ctx.Repo.Repository.OwnerName
	if issue.IsPull {
		pull := issue.PullRequest
		ctx.Data["BaseBranch"] = pull.BaseBranch
		ctx.Data["HeadBranch"] = pull.HeadBranch
		ctx.Data["HeadUserName"] = pull.MustHeadUserName(ctx)
	}
}

// ViewIssue render issue view page
func ViewIssue(ctx *context.Context) {
	if ctx.Params(":type") == "issues" {
		// If issue was requested we check if repo has external tracker and redirect
		extIssueUnit, err := ctx.Repo.Repository.GetUnit(ctx, unit.TypeExternalTracker)
		if err == nil && extIssueUnit != nil {
			if extIssueUnit.ExternalTrackerConfig().ExternalTrackerStyle == markup.IssueNameStyleNumeric || extIssueUnit.ExternalTrackerConfig().ExternalTrackerStyle == "" {
				metas := ctx.Repo.Repository.ComposeMetas(ctx)
				metas["index"] = ctx.Params(":index")
				res, err := vars.Expand(extIssueUnit.ExternalTrackerConfig().ExternalTrackerFormat, metas)
				if err != nil {
					log.Error("unable to expand template vars for issue url. issue: %s, err: %v", metas["index"], err)
					ctx.ServerError("Expand", err)
					return
				}
				ctx.Redirect(res)
				return
			}
		} else if err != nil && !repo_model.IsErrUnitTypeNotExist(err) {
			ctx.ServerError("GetUnit", err)
			return
		}
	}

	issue, err := issues_model.GetIssueByIndex(ctx, ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
	if err != nil {
		if issues_model.IsErrIssueNotExist(err) {
			ctx.NotFound("GetIssueByIndex", err)
		} else {
			ctx.ServerError("GetIssueByIndex", err)
		}
		return
	}
	if issue.Repo == nil {
		issue.Repo = ctx.Repo.Repository
	}

	// Make sure type and URL matches.
	if ctx.Params(":type") == "issues" && issue.IsPull {
		ctx.Redirect(issue.Link())
		return
	} else if ctx.Params(":type") == "pulls" && !issue.IsPull {
		ctx.Redirect(issue.Link())
		return
	}

	if issue.IsPull {
		MustAllowPulls(ctx)
		if ctx.Written() {
			return
		}
		ctx.Data["PageIsPullList"] = true
		ctx.Data["PageIsPullConversation"] = true
	} else {
		MustEnableIssues(ctx)
		if ctx.Written() {
			return
		}
		ctx.Data["PageIsIssueList"] = true
		ctx.Data["NewIssueChooseTemplate"] = issue_service.HasTemplatesOrContactLinks(ctx.Repo.Repository, ctx.Repo.GitRepo)
	}

	if issue.IsPull && !ctx.Repo.CanRead(unit.TypeIssues) {
		ctx.Data["IssueType"] = "pulls"
	} else if !issue.IsPull && !ctx.Repo.CanRead(unit.TypePullRequests) {
		ctx.Data["IssueType"] = "issues"
	} else {
		ctx.Data["IssueType"] = "all"
	}

	ctx.Data["IsProjectsEnabled"] = ctx.Repo.CanRead(unit.TypeProjects)
	ctx.Data["IsAttachmentEnabled"] = setting.Attachment.Enabled
	upload.AddUploadContext(ctx, "comment")

	if err = issue.LoadAttributes(ctx); err != nil {
		ctx.ServerError("LoadAttributes", err)
		return
	}

	if err = filterXRefComments(ctx, issue); err != nil {
		ctx.ServerError("filterXRefComments", err)
		return
	}

	ctx.Data["Title"] = fmt.Sprintf("#%d - %s", issue.Index, emoji.ReplaceAliases(issue.Title))

	iw := new(issues_model.IssueWatch)
	if ctx.Doer != nil {
		iw.UserID = ctx.Doer.ID
		iw.IssueID = issue.ID
		iw.IsWatching, err = issues_model.CheckIssueWatch(ctx, ctx.Doer, issue)
		if err != nil {
			ctx.ServerError("CheckIssueWatch", err)
			return
		}
	}
	ctx.Data["IssueWatch"] = iw
	issue.RenderedContent, err = markdown.RenderString(&markup.RenderContext{
		Links: markup.Links{
			Base: ctx.Repo.RepoLink,
		},
		Metas:   ctx.Repo.Repository.ComposeMetas(ctx),
		GitRepo: ctx.Repo.GitRepo,
		Ctx:     ctx,
	}, issue.Content)
	if err != nil {
		ctx.ServerError("RenderString", err)
		return
	}

	repo := ctx.Repo.Repository

	// Get more information if it's a pull request.
	if issue.IsPull {
		if issue.PullRequest.HasMerged {
			ctx.Data["DisableStatusChange"] = issue.PullRequest.HasMerged
			PrepareMergedViewPullInfo(ctx, issue)
		} else {
			PrepareViewPullInfo(ctx, issue)
			ctx.Data["DisableStatusChange"] = ctx.Data["IsPullRequestBroken"] == true && issue.IsClosed
		}
		if ctx.Written() {
			return
		}
	}

	// Metas.
	// Check labels.
	labelIDMark := make(container.Set[int64])
	for _, label := range issue.Labels {
		labelIDMark.Add(label.ID)
	}
	labels, err := issues_model.GetLabelsByRepoID(ctx, repo.ID, "", db.ListOptions{})
	if err != nil {
		ctx.ServerError("GetLabelsByRepoID", err)
		return
	}
	ctx.Data["Labels"] = labels

	if repo.Owner.IsOrganization() {
		orgLabels, err := issues_model.GetLabelsByOrgID(ctx, repo.Owner.ID, ctx.FormString("sort"), db.ListOptions{})
		if err != nil {
			ctx.ServerError("GetLabelsByOrgID", err)
			return
		}
		ctx.Data["OrgLabels"] = orgLabels

		labels = append(labels, orgLabels...)
	}

	hasSelected := false
	for i := range labels {
		if labelIDMark.Contains(labels[i].ID) {
			labels[i].IsChecked = true
			hasSelected = true
		}
	}
	ctx.Data["HasSelectedLabel"] = hasSelected

	// Check milestone and assignee.
	if ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) {
		RetrieveRepoMilestonesAndAssignees(ctx, repo)
		retrieveProjects(ctx, repo)

		if ctx.Written() {
			return
		}
	}

	if issue.IsPull {
		canChooseReviewer := false
		if ctx.Doer != nil && ctx.IsSigned {
			canChooseReviewer = issue_service.CanDoerChangeReviewRequests(ctx, ctx.Doer, repo, issue)
		}

		RetrieveRepoReviewers(ctx, repo, issue, canChooseReviewer)
		if ctx.Written() {
			return
		}
	}

	if ctx.IsSigned {
		// Update issue-user.
		if err = activities_model.SetIssueReadBy(ctx, issue.ID, ctx.Doer.ID); err != nil {
			ctx.ServerError("ReadBy", err)
			return
		}
	}

	var (
		role                 issues_model.RoleDescriptor
		ok                   bool
		marked               = make(map[int64]issues_model.RoleDescriptor)
		comment              *issues_model.Comment
		participants         = make([]*user_model.User, 1, 10)
		latestCloseCommentID int64
	)
	if ctx.Repo.Repository.IsTimetrackerEnabled(ctx) {
		if ctx.IsSigned {
			// Deal with the stopwatch
			ctx.Data["IsStopwatchRunning"] = issues_model.StopwatchExists(ctx, ctx.Doer.ID, issue.ID)
			if !ctx.Data["IsStopwatchRunning"].(bool) {
				var exists bool
				var swIssue *issues_model.Issue
				if exists, _, swIssue, err = issues_model.HasUserStopwatch(ctx, ctx.Doer.ID); err != nil {
					ctx.ServerError("HasUserStopwatch", err)
					return
				}
				ctx.Data["HasUserStopwatch"] = exists
				if exists {
					// Add warning if the user has already a stopwatch
					// Add link to the issue of the already running stopwatch
					ctx.Data["OtherStopwatchURL"] = swIssue.Link()
				}
			}
			ctx.Data["CanUseTimetracker"] = ctx.Repo.CanUseTimetracker(ctx, issue, ctx.Doer)
		} else {
			ctx.Data["CanUseTimetracker"] = false
		}
		if ctx.Data["WorkingUsers"], err = issues_model.TotalTimesForEachUser(ctx, &issues_model.FindTrackedTimesOptions{IssueID: issue.ID}); err != nil {
			ctx.ServerError("TotalTimesForEachUser", err)
			return
		}
	}

	// Check if the user can use the dependencies
	ctx.Data["CanCreateIssueDependencies"] = ctx.Repo.CanCreateIssueDependencies(ctx, ctx.Doer, issue.IsPull)

	// check if dependencies can be created across repositories
	ctx.Data["AllowCrossRepositoryDependencies"] = setting.Service.AllowCrossRepositoryDependencies

	if issue.ShowRole, err = roleDescriptor(ctx, repo, issue.Poster, issue, issue.HasOriginalAuthor()); err != nil {
		ctx.ServerError("roleDescriptor", err)
		return
	}
	marked[issue.PosterID] = issue.ShowRole

	// Render comments and and fetch participants.
	participants[0] = issue.Poster
	for _, comment = range issue.Comments {
		comment.Issue = issue

		if err := comment.LoadPoster(ctx); err != nil {
			ctx.ServerError("LoadPoster", err)
			return
		}

		if comment.Type == issues_model.CommentTypeComment || comment.Type == issues_model.CommentTypeReview {
			if err := comment.LoadAttachments(ctx); err != nil {
				ctx.ServerError("LoadAttachments", err)
				return
			}

			comment.RenderedContent, err = markdown.RenderString(&markup.RenderContext{
				Links: markup.Links{
					Base: ctx.Repo.RepoLink,
				},
				Metas:   ctx.Repo.Repository.ComposeMetas(ctx),
				GitRepo: ctx.Repo.GitRepo,
				Ctx:     ctx,
			}, comment.Content)
			if err != nil {
				ctx.ServerError("RenderString", err)
				return
			}
			// Check tag.
			role, ok = marked[comment.PosterID]
			if ok {
				comment.ShowRole = role
				continue
			}

			comment.ShowRole, err = roleDescriptor(ctx, repo, comment.Poster, issue, comment.HasOriginalAuthor())
			if err != nil {
				ctx.ServerError("roleDescriptor", err)
				return
			}
			marked[comment.PosterID] = comment.ShowRole
			participants = addParticipant(comment.Poster, participants)
		} else if comment.Type == issues_model.CommentTypeLabel {
			if err = comment.LoadLabel(ctx); err != nil {
				ctx.ServerError("LoadLabel", err)
				return
			}
		} else if comment.Type == issues_model.CommentTypeMilestone {
			if err = comment.LoadMilestone(ctx); err != nil {
				ctx.ServerError("LoadMilestone", err)
				return
			}
			ghostMilestone := &issues_model.Milestone{
				ID:   -1,
				Name: ctx.Locale.TrString("repo.issues.deleted_milestone"),
			}
			if comment.OldMilestoneID > 0 && comment.OldMilestone == nil {
				comment.OldMilestone = ghostMilestone
			}
			if comment.MilestoneID > 0 && comment.Milestone == nil {
				comment.Milestone = ghostMilestone
			}
		} else if comment.Type == issues_model.CommentTypeProject {

			if err = comment.LoadProject(ctx); err != nil {
				ctx.ServerError("LoadProject", err)
				return
			}

			ghostProject := &project_model.Project{
				ID:    -1,
				Title: ctx.Locale.TrString("repo.issues.deleted_project"),
			}

			if comment.OldProjectID > 0 && comment.OldProject == nil {
				comment.OldProject = ghostProject
			}

			if comment.ProjectID > 0 && comment.Project == nil {
				comment.Project = ghostProject
			}

		} else if comment.Type == issues_model.CommentTypeAssignees || comment.Type == issues_model.CommentTypeReviewRequest {
			if err = comment.LoadAssigneeUserAndTeam(ctx); err != nil {
				ctx.ServerError("LoadAssigneeUserAndTeam", err)
				return
			}
		} else if comment.Type == issues_model.CommentTypeRemoveDependency || comment.Type == issues_model.CommentTypeAddDependency {
			if err = comment.LoadDepIssueDetails(ctx); err != nil {
				if !issues_model.IsErrIssueNotExist(err) {
					ctx.ServerError("LoadDepIssueDetails", err)
					return
				}
			}
		} else if comment.Type.HasContentSupport() {
			comment.RenderedContent, err = markdown.RenderString(&markup.RenderContext{
				Links: markup.Links{
					Base: ctx.Repo.RepoLink,
				},
				Metas:   ctx.Repo.Repository.ComposeMetas(ctx),
				GitRepo: ctx.Repo.GitRepo,
				Ctx:     ctx,
			}, comment.Content)
			if err != nil {
				ctx.ServerError("RenderString", err)
				return
			}
			if err = comment.LoadReview(ctx); err != nil && !issues_model.IsErrReviewNotExist(err) {
				ctx.ServerError("LoadReview", err)
				return
			}
			participants = addParticipant(comment.Poster, participants)
			if comment.Review == nil {
				continue
			}
			if err = comment.Review.LoadAttributes(ctx); err != nil {
				if !user_model.IsErrUserNotExist(err) {
					ctx.ServerError("Review.LoadAttributes", err)
					return
				}
				comment.Review.Reviewer = user_model.NewGhostUser()
			}
			if err = comment.Review.LoadCodeComments(ctx); err != nil {
				ctx.ServerError("Review.LoadCodeComments", err)
				return
			}
			for _, codeComments := range comment.Review.CodeComments {
				for _, lineComments := range codeComments {
					for _, c := range lineComments {
						if err := c.LoadAttachments(ctx); err != nil {
							ctx.ServerError("LoadAttachments", err)
							return
						}
						// Check tag.
						role, ok = marked[c.PosterID]
						if ok {
							c.ShowRole = role
							continue
						}

						c.ShowRole, err = roleDescriptor(ctx, repo, c.Poster, issue, c.HasOriginalAuthor())
						if err != nil {
							ctx.ServerError("roleDescriptor", err)
							return
						}
						marked[c.PosterID] = c.ShowRole
						participants = addParticipant(c.Poster, participants)
					}
				}
			}
			if err = comment.LoadResolveDoer(ctx); err != nil {
				ctx.ServerError("LoadResolveDoer", err)
				return
			}
		} else if comment.Type == issues_model.CommentTypePullRequestPush {
			participants = addParticipant(comment.Poster, participants)
			if err = comment.LoadPushCommits(ctx); err != nil {
				ctx.ServerError("LoadPushCommits", err)
				return
			}
		} else if comment.Type == issues_model.CommentTypeAddTimeManual ||
			comment.Type == issues_model.CommentTypeStopTracking ||
			comment.Type == issues_model.CommentTypeDeleteTimeManual {
			// drop error since times could be pruned from DB..
			_ = comment.LoadTime(ctx)
			if comment.Content != "" {
				// Content before v1.21 did store the formated string instead of seconds,
				// so "|" is used as delimeter to mark the new format
				if comment.Content[0] != '|' {
					// handle old time comments that have formatted text stored
					comment.RenderedContent = templates.SanitizeHTML(comment.Content)
					comment.Content = ""
				} else {
					// else it's just a duration in seconds to pass on to the frontend
					comment.Content = comment.Content[1:]
				}
			}
		}

		if comment.Type == issues_model.CommentTypeClose || comment.Type == issues_model.CommentTypeMergePull {
			// record ID of the latest closed/merged comment.
			// if PR is closed, the comments whose type is CommentTypePullRequestPush(29) after latestCloseCommentID won't be rendered.
			latestCloseCommentID = comment.ID
		}
	}

	ctx.Data["LatestCloseCommentID"] = latestCloseCommentID

	// Combine multiple label assignments into a single comment
	combineLabelComments(issue)

	getBranchData(ctx, issue)
	if issue.IsPull {
		pull := issue.PullRequest
		pull.Issue = issue
		canDelete := false
		allowMerge := false

		if ctx.IsSigned {
			if err := pull.LoadHeadRepo(ctx); err != nil {
				log.Error("LoadHeadRepo: %v", err)
			} else if pull.HeadRepo != nil {
				perm, err := access_model.GetUserRepoPermission(ctx, pull.HeadRepo, ctx.Doer)
				if err != nil {
					ctx.ServerError("GetUserRepoPermission", err)
					return
				}
				if perm.CanWrite(unit.TypeCode) {
					// Check if branch is not protected
					if pull.HeadBranch != pull.HeadRepo.DefaultBranch {
						if protected, err := git_model.IsBranchProtected(ctx, pull.HeadRepo.ID, pull.HeadBranch); err != nil {
							log.Error("IsProtectedBranch: %v", err)
						} else if !protected {
							canDelete = true
							ctx.Data["DeleteBranchLink"] = issue.Link() + "/cleanup"
						}
					}
					ctx.Data["CanWriteToHeadRepo"] = true
				}
			}

			if err := pull.LoadBaseRepo(ctx); err != nil {
				log.Error("LoadBaseRepo: %v", err)
			}
			perm, err := access_model.GetUserRepoPermission(ctx, pull.BaseRepo, ctx.Doer)
			if err != nil {
				ctx.ServerError("GetUserRepoPermission", err)
				return
			}
			allowMerge, err = pull_service.IsUserAllowedToMerge(ctx, pull, perm, ctx.Doer)
			if err != nil {
				ctx.ServerError("IsUserAllowedToMerge", err)
				return
			}

			if ctx.Data["CanMarkConversation"], err = issues_model.CanMarkConversation(ctx, issue, ctx.Doer); err != nil {
				ctx.ServerError("CanMarkConversation", err)
				return
			}
		}

		ctx.Data["AllowMerge"] = allowMerge

		prUnit, err := repo.GetUnit(ctx, unit.TypePullRequests)
		if err != nil {
			ctx.ServerError("GetUnit", err)
			return
		}
		prConfig := prUnit.PullRequestsConfig()

		var mergeStyle repo_model.MergeStyle
		// Check correct values and select default
		if ms, ok := ctx.Data["MergeStyle"].(repo_model.MergeStyle); !ok ||
			!prConfig.IsMergeStyleAllowed(ms) {
			defaultMergeStyle := prConfig.GetDefaultMergeStyle()
			if prConfig.IsMergeStyleAllowed(defaultMergeStyle) && !ok {
				mergeStyle = defaultMergeStyle
			} else if prConfig.AllowMerge {
				mergeStyle = repo_model.MergeStyleMerge
			} else if prConfig.AllowRebase {
				mergeStyle = repo_model.MergeStyleRebase
			} else if prConfig.AllowRebaseMerge {
				mergeStyle = repo_model.MergeStyleRebaseMerge
			} else if prConfig.AllowSquash {
				mergeStyle = repo_model.MergeStyleSquash
			} else if prConfig.AllowFastForwardOnly {
				mergeStyle = repo_model.MergeStyleFastForwardOnly
			} else if prConfig.AllowManualMerge {
				mergeStyle = repo_model.MergeStyleManuallyMerged
			}
		}

		ctx.Data["MergeStyle"] = mergeStyle

		defaultMergeMessage, defaultMergeBody, err := pull_service.GetDefaultMergeMessage(ctx, ctx.Repo.GitRepo, pull, mergeStyle)
		if err != nil {
			ctx.ServerError("GetDefaultMergeMessage", err)
			return
		}
		ctx.Data["DefaultMergeMessage"] = defaultMergeMessage
		ctx.Data["DefaultMergeBody"] = defaultMergeBody

		defaultSquashMergeMessage, defaultSquashMergeBody, err := pull_service.GetDefaultMergeMessage(ctx, ctx.Repo.GitRepo, pull, repo_model.MergeStyleSquash)
		if err != nil {
			ctx.ServerError("GetDefaultSquashMergeMessage", err)
			return
		}
		ctx.Data["DefaultSquashMergeMessage"] = defaultSquashMergeMessage
		ctx.Data["DefaultSquashMergeBody"] = defaultSquashMergeBody

		pb, err := git_model.GetFirstMatchProtectedBranchRule(ctx, pull.BaseRepoID, pull.BaseBranch)
		if err != nil {
			ctx.ServerError("LoadProtectedBranch", err)
			return
		}
		ctx.Data["ShowMergeInstructions"] = true
		if pb != nil {
			pb.Repo = pull.BaseRepo
			var showMergeInstructions bool
			if ctx.Doer != nil {
				showMergeInstructions = pb.CanUserPush(ctx, ctx.Doer)
			}
			ctx.Data["ProtectedBranch"] = pb
			ctx.Data["IsBlockedByApprovals"] = !issues_model.HasEnoughApprovals(ctx, pb, pull)
			ctx.Data["IsBlockedByRejection"] = issues_model.MergeBlockedByRejectedReview(ctx, pb, pull)
			ctx.Data["IsBlockedByOfficialReviewRequests"] = issues_model.MergeBlockedByOfficialReviewRequests(ctx, pb, pull)
			ctx.Data["IsBlockedByOutdatedBranch"] = issues_model.MergeBlockedByOutdatedBranch(pb, pull)
			ctx.Data["GrantedApprovals"] = issues_model.GetGrantedApprovalsCount(ctx, pb, pull)
			ctx.Data["RequireSigned"] = pb.RequireSignedCommits
			ctx.Data["ChangedProtectedFiles"] = pull.ChangedProtectedFiles
			ctx.Data["IsBlockedByChangedProtectedFiles"] = len(pull.ChangedProtectedFiles) != 0
			ctx.Data["ChangedProtectedFilesNum"] = len(pull.ChangedProtectedFiles)
			ctx.Data["ShowMergeInstructions"] = showMergeInstructions
		}
		ctx.Data["WillSign"] = false
		if ctx.Doer != nil {
			sign, key, _, err := asymkey_service.SignMerge(ctx, pull, ctx.Doer, pull.BaseRepo.RepoPath(), pull.BaseBranch, pull.GetGitRefName())
			ctx.Data["WillSign"] = sign
			ctx.Data["SigningKey"] = key
			if err != nil {
				if asymkey_service.IsErrWontSign(err) {
					ctx.Data["WontSignReason"] = err.(*asymkey_service.ErrWontSign).Reason
				} else {
					ctx.Data["WontSignReason"] = "error"
					log.Error("Error whilst checking if could sign pr %d in repo %s. Error: %v", pull.ID, pull.BaseRepo.FullName(), err)
				}
			}
		} else {
			ctx.Data["WontSignReason"] = "not_signed_in"
		}

		isPullBranchDeletable := canDelete &&
			pull.HeadRepo != nil &&
			git.IsBranchExist(ctx, pull.HeadRepo.RepoPath(), pull.HeadBranch) &&
			(!pull.HasMerged || ctx.Data["HeadBranchCommitID"] == ctx.Data["PullHeadCommitID"])

		if isPullBranchDeletable && pull.HasMerged {
			exist, err := issues_model.HasUnmergedPullRequestsByHeadInfo(ctx, pull.HeadRepoID, pull.HeadBranch)
			if err != nil {
				ctx.ServerError("HasUnmergedPullRequestsByHeadInfo", err)
				return
			}

			isPullBranchDeletable = !exist
		}
		ctx.Data["IsPullBranchDeletable"] = isPullBranchDeletable

		stillCanManualMerge := func() bool {
			if pull.HasMerged || issue.IsClosed || !ctx.IsSigned {
				return false
			}
			if pull.CanAutoMerge() || pull.IsWorkInProgress(ctx) || pull.IsChecking() {
				return false
			}
			if allowMerge && prConfig.AllowManualMerge {
				return true
			}

			return false
		}

		ctx.Data["StillCanManualMerge"] = stillCanManualMerge()

		// Check if there is a pending pr merge
		ctx.Data["HasPendingPullRequestMerge"], ctx.Data["PendingPullRequestMerge"], err = pull_model.GetScheduledMergeByPullID(ctx, pull.ID)
		if err != nil {
			ctx.ServerError("GetScheduledMergeByPullID", err)
			return
		}
	}

	// Get Dependencies
	blockedBy, err := issue.BlockedByDependencies(ctx, db.ListOptions{})
	if err != nil {
		ctx.ServerError("BlockedByDependencies", err)
		return
	}
	ctx.Data["BlockedByDependencies"], ctx.Data["BlockedByDependenciesNotPermitted"] = checkBlockedByIssues(ctx, blockedBy)
	if ctx.Written() {
		return
	}

	blocking, err := issue.BlockingDependencies(ctx)
	if err != nil {
		ctx.ServerError("BlockingDependencies", err)
		return
	}

	ctx.Data["BlockingDependencies"], ctx.Data["BlockingDependenciesNotPermitted"] = checkBlockedByIssues(ctx, blocking)
	if ctx.Written() {
		return
	}

	var pinAllowed bool
	if !issue.IsPinned() {
		pinAllowed, err = issues_model.IsNewPinAllowed(ctx, issue.RepoID, issue.IsPull)
		if err != nil {
			ctx.ServerError("IsNewPinAllowed", err)
			return
		}
	} else {
		pinAllowed = true
	}

	ctx.Data["Participants"] = participants
	ctx.Data["NumParticipants"] = len(participants)
	ctx.Data["Issue"] = issue
	ctx.Data["Reference"] = issue.Ref
	ctx.Data["SignInLink"] = setting.AppSubURL + "/user/login?redirect_to=" + url.QueryEscape(ctx.Data["Link"].(string))
	ctx.Data["IsIssuePoster"] = ctx.IsSigned && issue.IsPoster(ctx.Doer.ID)
	ctx.Data["HasIssuesOrPullsWritePermission"] = ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull)
	ctx.Data["HasProjectsWritePermission"] = ctx.Repo.CanWrite(unit.TypeProjects)
	ctx.Data["IsRepoAdmin"] = ctx.IsSigned && (ctx.Repo.IsAdmin() || ctx.Doer.IsAdmin)
	ctx.Data["LockReasons"] = setting.Repository.Issue.LockReasons
	ctx.Data["RefEndName"] = git.RefName(issue.Ref).ShortName()
	ctx.Data["NewPinAllowed"] = pinAllowed
	ctx.Data["PinEnabled"] = setting.Repository.Issue.MaxPinned != 0

	var hiddenCommentTypes *big.Int
	if ctx.IsSigned {
		val, err := user_model.GetUserSetting(ctx, ctx.Doer.ID, user_model.SettingsKeyHiddenCommentTypes)
		if err != nil {
			ctx.ServerError("GetUserSetting", err)
			return
		}
		hiddenCommentTypes, _ = new(big.Int).SetString(val, 10) // we can safely ignore the failed conversion here
	}
	ctx.Data["ShouldShowCommentType"] = func(commentType issues_model.CommentType) bool {
		return hiddenCommentTypes == nil || hiddenCommentTypes.Bit(int(commentType)) == 0
	}
	// For sidebar
	PrepareBranchList(ctx)

	if ctx.Written() {
		return
	}

	tags, err := repo_model.GetTagNamesByRepoID(ctx, ctx.Repo.Repository.ID)
	if err != nil {
		ctx.ServerError("GetTagNamesByRepoID", err)
		return
	}
	ctx.Data["Tags"] = tags

	ctx.HTML(http.StatusOK, tplIssueView)
}

// checkBlockedByIssues return canRead and notPermitted
func checkBlockedByIssues(ctx *context.Context, blockers []*issues_model.DependencyInfo) (canRead, notPermitted []*issues_model.DependencyInfo) {
	repoPerms := make(map[int64]access_model.Permission)
	repoPerms[ctx.Repo.Repository.ID] = ctx.Repo.Permission
	for _, blocker := range blockers {
		// Get the permissions for this repository
		// If the repo ID exists in the map, return the exist permissions
		// else get the permission and add it to the map
		var perm access_model.Permission
		existPerm, ok := repoPerms[blocker.RepoID]
		if ok {
			perm = existPerm
		} else {
			var err error
			perm, err = access_model.GetUserRepoPermission(ctx, &blocker.Repository, ctx.Doer)
			if err != nil {
				ctx.ServerError("GetUserRepoPermission", err)
				return nil, nil
			}
			repoPerms[blocker.RepoID] = perm
		}
		if perm.CanReadIssuesOrPulls(blocker.Issue.IsPull) {
			canRead = append(canRead, blocker)
		} else {
			notPermitted = append(notPermitted, blocker)
		}
	}
	sortDependencyInfo(canRead)
	sortDependencyInfo(notPermitted)
	return canRead, notPermitted
}

func sortDependencyInfo(blockers []*issues_model.DependencyInfo) {
	sort.Slice(blockers, func(i, j int) bool {
		if blockers[i].RepoID == blockers[j].RepoID {
			return blockers[i].Issue.CreatedUnix < blockers[j].Issue.CreatedUnix
		}
		return blockers[i].RepoID < blockers[j].RepoID
	})
}

// GetActionIssue will return the issue which is used in the context.
func GetActionIssue(ctx *context.Context) *issues_model.Issue {
	issue, err := issues_model.GetIssueByIndex(ctx, ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
	if err != nil {
		ctx.NotFoundOrServerError("GetIssueByIndex", issues_model.IsErrIssueNotExist, err)
		return nil
	}
	issue.Repo = ctx.Repo.Repository
	checkIssueRights(ctx, issue)
	if ctx.Written() {
		return nil
	}
	if err = issue.LoadAttributes(ctx); err != nil {
		ctx.ServerError("LoadAttributes", err)
		return nil
	}
	return issue
}

func checkIssueRights(ctx *context.Context, issue *issues_model.Issue) {
	if issue.IsPull && !ctx.Repo.CanRead(unit.TypePullRequests) ||
		!issue.IsPull && !ctx.Repo.CanRead(unit.TypeIssues) {
		ctx.NotFound("IssueOrPullRequestUnitNotAllowed", nil)
	}
}

func getActionIssues(ctx *context.Context) issues_model.IssueList {
	commaSeparatedIssueIDs := ctx.FormString("issue_ids")
	if len(commaSeparatedIssueIDs) == 0 {
		return nil
	}
	issueIDs := make([]int64, 0, 10)
	for _, stringIssueID := range strings.Split(commaSeparatedIssueIDs, ",") {
		issueID, err := strconv.ParseInt(stringIssueID, 10, 64)
		if err != nil {
			ctx.ServerError("ParseInt", err)
			return nil
		}
		issueIDs = append(issueIDs, issueID)
	}
	issues, err := issues_model.GetIssuesByIDs(ctx, issueIDs)
	if err != nil {
		ctx.ServerError("GetIssuesByIDs", err)
		return nil
	}
	// Check access rights for all issues
	issueUnitEnabled := ctx.Repo.CanRead(unit.TypeIssues)
	prUnitEnabled := ctx.Repo.CanRead(unit.TypePullRequests)
	for _, issue := range issues {
		if issue.RepoID != ctx.Repo.Repository.ID {
			ctx.NotFound("some issue's RepoID is incorrect", errors.New("some issue's RepoID is incorrect"))
			return nil
		}
		if issue.IsPull && !prUnitEnabled || !issue.IsPull && !issueUnitEnabled {
			ctx.NotFound("IssueOrPullRequestUnitNotAllowed", nil)
			return nil
		}
		if err = issue.LoadAttributes(ctx); err != nil {
			ctx.ServerError("LoadAttributes", err)
			return nil
		}
	}
	return issues
}

// GetIssueInfo get an issue of a repository
func GetIssueInfo(ctx *context.Context) {
	issue, err := issues_model.GetIssueWithAttrsByIndex(ctx, ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
	if err != nil {
		if issues_model.IsErrIssueNotExist(err) {
			ctx.Error(http.StatusNotFound)
		} else {
			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err.Error())
		}
		return
	}

	if issue.IsPull {
		// Need to check if Pulls are enabled and we can read Pulls
		if !ctx.Repo.Repository.CanEnablePulls() || !ctx.Repo.CanRead(unit.TypePullRequests) {
			ctx.Error(http.StatusNotFound)
			return
		}
	} else {
		// Need to check if Issues are enabled and we can read Issues
		if !ctx.Repo.CanRead(unit.TypeIssues) {
			ctx.Error(http.StatusNotFound)
			return
		}
	}

	ctx.JSON(http.StatusOK, convert.ToIssue(ctx, issue))
}

// UpdateIssueTitle change issue's title
func UpdateIssueTitle(ctx *context.Context) {
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}

	if !ctx.IsSigned || (!issue.IsPoster(ctx.Doer.ID) && !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull)) {
		ctx.Error(http.StatusForbidden)
		return
	}

	title := ctx.FormTrim("title")
	if len(title) == 0 {
		ctx.Error(http.StatusNoContent)
		return
	}

	if err := issue_service.ChangeTitle(ctx, issue, ctx.Doer, title); err != nil {
		ctx.ServerError("ChangeTitle", err)
		return
	}

	ctx.JSON(http.StatusOK, map[string]any{
		"title": issue.Title,
	})
}

// UpdateIssueRef change issue's ref (branch)
func UpdateIssueRef(ctx *context.Context) {
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}

	if !ctx.IsSigned || (!issue.IsPoster(ctx.Doer.ID) && !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull)) || issue.IsPull {
		ctx.Error(http.StatusForbidden)
		return
	}

	ref := ctx.FormTrim("ref")

	if err := issue_service.ChangeIssueRef(ctx, issue, ctx.Doer, ref); err != nil {
		ctx.ServerError("ChangeRef", err)
		return
	}

	ctx.JSON(http.StatusOK, map[string]any{
		"ref": ref,
	})
}

// UpdateIssueContent change issue's content
func UpdateIssueContent(ctx *context.Context) {
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}

	if !ctx.IsSigned || (ctx.Doer.ID != issue.PosterID && !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull)) {
		ctx.Error(http.StatusForbidden)
		return
	}

	if err := issue_service.ChangeContent(ctx, issue, ctx.Doer, ctx.Req.FormValue("content")); err != nil {
		ctx.ServerError("ChangeContent", err)
		return
	}

	// when update the request doesn't intend to update attachments (eg: change checkbox state), ignore attachment updates
	if !ctx.FormBool("ignore_attachments") {
		if err := updateAttachments(ctx, issue, ctx.FormStrings("files[]")); err != nil {
			ctx.ServerError("UpdateAttachments", err)
			return
		}
	}

	content, err := markdown.RenderString(&markup.RenderContext{
		Links: markup.Links{
			Base: ctx.FormString("context"), // FIXME: <- IS THIS SAFE ?
		},
		Metas:   ctx.Repo.Repository.ComposeMetas(ctx),
		GitRepo: ctx.Repo.GitRepo,
		Ctx:     ctx,
	}, issue.Content)
	if err != nil {
		ctx.ServerError("RenderString", err)
		return
	}

	ctx.JSON(http.StatusOK, map[string]any{
		"content":     content,
		"attachments": attachmentsHTML(ctx, issue.Attachments, issue.Content),
	})
}

// UpdateIssueDeadline updates an issue deadline
func UpdateIssueDeadline(ctx *context.Context) {
	form := web.GetForm(ctx).(*api.EditDeadlineOption)
	issue, err := issues_model.GetIssueByIndex(ctx, ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))
	if err != nil {
		if issues_model.IsErrIssueNotExist(err) {
			ctx.NotFound("GetIssueByIndex", err)
		} else {
			ctx.Error(http.StatusInternalServerError, "GetIssueByIndex", err.Error())
		}
		return
	}

	if !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) {
		ctx.Error(http.StatusForbidden, "", "Not repo writer")
		return
	}

	var deadlineUnix timeutil.TimeStamp
	var deadline time.Time
	if form.Deadline != nil && !form.Deadline.IsZero() {
		deadline = time.Date(form.Deadline.Year(), form.Deadline.Month(), form.Deadline.Day(),
			23, 59, 59, 0, time.Local)
		deadlineUnix = timeutil.TimeStamp(deadline.Unix())
	}

	if err := issues_model.UpdateIssueDeadline(ctx, issue, deadlineUnix, ctx.Doer); err != nil {
		ctx.Error(http.StatusInternalServerError, "UpdateIssueDeadline", err.Error())
		return
	}

	ctx.JSON(http.StatusCreated, api.IssueDeadline{Deadline: &deadline})
}

// UpdateIssueMilestone change issue's milestone
func UpdateIssueMilestone(ctx *context.Context) {
	issues := getActionIssues(ctx)
	if ctx.Written() {
		return
	}

	milestoneID := ctx.FormInt64("id")
	for _, issue := range issues {
		oldMilestoneID := issue.MilestoneID
		if oldMilestoneID == milestoneID {
			continue
		}
		issue.MilestoneID = milestoneID
		if err := issue_service.ChangeMilestoneAssign(ctx, issue, ctx.Doer, oldMilestoneID); err != nil {
			ctx.ServerError("ChangeMilestoneAssign", err)
			return
		}
	}

	ctx.JSONOK()
}

// UpdateIssueAssignee change issue's or pull's assignee
func UpdateIssueAssignee(ctx *context.Context) {
	issues := getActionIssues(ctx)
	if ctx.Written() {
		return
	}

	assigneeID := ctx.FormInt64("id")
	action := ctx.FormString("action")

	for _, issue := range issues {
		switch action {
		case "clear":
			if err := issue_service.DeleteNotPassedAssignee(ctx, issue, ctx.Doer, []*user_model.User{}); err != nil {
				ctx.ServerError("ClearAssignees", err)
				return
			}
		default:
			assignee, err := user_model.GetUserByID(ctx, assigneeID)
			if err != nil {
				ctx.ServerError("GetUserByID", err)
				return
			}

			valid, err := access_model.CanBeAssigned(ctx, assignee, issue.Repo, issue.IsPull)
			if err != nil {
				ctx.ServerError("canBeAssigned", err)
				return
			}
			if !valid {
				ctx.ServerError("canBeAssigned", repo_model.ErrUserDoesNotHaveAccessToRepo{UserID: assigneeID, RepoName: issue.Repo.Name})
				return
			}

			_, _, err = issue_service.ToggleAssigneeWithNotify(ctx, issue, ctx.Doer, assigneeID)
			if err != nil {
				ctx.ServerError("ToggleAssignee", err)
				return
			}
		}
	}
	ctx.JSONOK()
}

// UpdatePullReviewRequest add or remove review request
func UpdatePullReviewRequest(ctx *context.Context) {
	issues := getActionIssues(ctx)
	if ctx.Written() {
		return
	}

	reviewID := ctx.FormInt64("id")
	action := ctx.FormString("action")

	// TODO: Not support 'clear' now
	if action != "attach" && action != "detach" {
		ctx.Status(http.StatusForbidden)
		return
	}

	for _, issue := range issues {
		if err := issue.LoadRepo(ctx); err != nil {
			ctx.ServerError("issue.LoadRepo", err)
			return
		}

		if !issue.IsPull {
			log.Warn(
				"UpdatePullReviewRequest: refusing to add review request for non-PR issue %-v#%d",
				issue.Repo, issue.Index,
			)
			ctx.Status(http.StatusForbidden)
			return
		}
		if reviewID < 0 {
			// negative reviewIDs represent team requests
			if err := issue.Repo.LoadOwner(ctx); err != nil {
				ctx.ServerError("issue.Repo.LoadOwner", err)
				return
			}

			if !issue.Repo.Owner.IsOrganization() {
				log.Warn(
					"UpdatePullReviewRequest: refusing to add team review request for %s#%d owned by non organization UID[%d]",
					issue.Repo.FullName(), issue.Index, issue.Repo.ID,
				)
				ctx.Status(http.StatusForbidden)
				return
			}

			team, err := organization.GetTeamByID(ctx, -reviewID)
			if err != nil {
				ctx.ServerError("GetTeamByID", err)
				return
			}

			if team.OrgID != issue.Repo.OwnerID {
				log.Warn(
					"UpdatePullReviewRequest: refusing to add team review request for UID[%d] team %s to %s#%d owned by UID[%d]",
					team.OrgID, team.Name, issue.Repo.FullName(), issue.Index, issue.Repo.ID)
				ctx.Status(http.StatusForbidden)
				return
			}

			err = issue_service.IsValidTeamReviewRequest(ctx, team, ctx.Doer, action == "attach", issue)
			if err != nil {
				if issues_model.IsErrNotValidReviewRequest(err) {
					log.Warn(
						"UpdatePullReviewRequest: refusing to add invalid team review request for UID[%d] team %s to %s#%d owned by UID[%d]: Error: %v",
						team.OrgID, team.Name, issue.Repo.FullName(), issue.Index, issue.Repo.ID,
						err,
					)
					ctx.Status(http.StatusForbidden)
					return
				}
				ctx.ServerError("IsValidTeamReviewRequest", err)
				return
			}

			_, err = issue_service.TeamReviewRequest(ctx, issue, ctx.Doer, team, action == "attach")
			if err != nil {
				ctx.ServerError("TeamReviewRequest", err)
				return
			}
			continue
		}

		reviewer, err := user_model.GetUserByID(ctx, reviewID)
		if err != nil {
			if user_model.IsErrUserNotExist(err) {
				log.Warn(
					"UpdatePullReviewRequest: requested reviewer [%d] for %-v to %-v#%d is not exist: Error: %v",
					reviewID, issue.Repo, issue.Index,
					err,
				)
				ctx.Status(http.StatusForbidden)
				return
			}
			ctx.ServerError("GetUserByID", err)
			return
		}

		err = issue_service.IsValidReviewRequest(ctx, reviewer, ctx.Doer, action == "attach", issue, nil)
		if err != nil {
			if issues_model.IsErrNotValidReviewRequest(err) {
				log.Warn(
					"UpdatePullReviewRequest: refusing to add invalid review request for %-v to %-v#%d: Error: %v",
					reviewer, issue.Repo, issue.Index,
					err,
				)
				ctx.Status(http.StatusForbidden)
				return
			}
			ctx.ServerError("isValidReviewRequest", err)
			return
		}

		_, err = issue_service.ReviewRequest(ctx, issue, ctx.Doer, reviewer, action == "attach")
		if err != nil {
			ctx.ServerError("ReviewRequest", err)
			return
		}
	}

	ctx.JSONOK()
}

// SearchIssues searches for issues across the repositories that the user has access to
func SearchIssues(ctx *context.Context) {
	before, since, err := context.GetQueryBeforeSince(ctx.Base)
	if err != nil {
		ctx.Error(http.StatusUnprocessableEntity, err.Error())
		return
	}

	var isClosed util.OptionalBool
	switch ctx.FormString("state") {
	case "closed":
		isClosed = util.OptionalBoolTrue
	case "all":
		isClosed = util.OptionalBoolNone
	default:
		isClosed = util.OptionalBoolFalse
	}

	var (
		repoIDs   []int64
		allPublic bool
	)
	{
		// find repos user can access (for issue search)
		opts := &repo_model.SearchRepoOptions{
			Private:     false,
			AllPublic:   true,
			TopicOnly:   false,
			Collaborate: optional.None[bool](),
			// This needs to be a column that is not nil in fixtures or
			// MySQL will return different results when sorting by null in some cases
			OrderBy: db.SearchOrderByAlphabetically,
			Actor:   ctx.Doer,
		}
		if ctx.IsSigned {
			opts.Private = true
			opts.AllLimited = true
		}
		if ctx.FormString("owner") != "" {
			owner, err := user_model.GetUserByName(ctx, ctx.FormString("owner"))
			if err != nil {
				if user_model.IsErrUserNotExist(err) {
					ctx.Error(http.StatusBadRequest, "Owner not found", err.Error())
				} else {
					ctx.Error(http.StatusInternalServerError, "GetUserByName", err.Error())
				}
				return
			}
			opts.OwnerID = owner.ID
			opts.AllLimited = false
			opts.AllPublic = false
			opts.Collaborate = optional.Some(false)
		}
		if ctx.FormString("team") != "" {
			if ctx.FormString("owner") == "" {
				ctx.Error(http.StatusBadRequest, "", "Owner organisation is required for filtering on team")
				return
			}
			team, err := organization.GetTeam(ctx, opts.OwnerID, ctx.FormString("team"))
			if err != nil {
				if organization.IsErrTeamNotExist(err) {
					ctx.Error(http.StatusBadRequest, "Team not found", err.Error())
				} else {
					ctx.Error(http.StatusInternalServerError, "GetUserByName", err.Error())
				}
				return
			}
			opts.TeamID = team.ID
		}

		if opts.AllPublic {
			allPublic = true
			opts.AllPublic = false // set it false to avoid returning too many repos, we could filter by indexer
		}
		repoIDs, _, err = repo_model.SearchRepositoryIDs(ctx, opts)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, "SearchRepositoryIDs", err.Error())
			return
		}
		if len(repoIDs) == 0 {
			// no repos found, don't let the indexer return all repos
			repoIDs = []int64{0}
		}
	}

	keyword := ctx.FormTrim("q")
	if strings.IndexByte(keyword, 0) >= 0 {
		keyword = ""
	}

	var isPull util.OptionalBool
	switch ctx.FormString("type") {
	case "pulls":
		isPull = util.OptionalBoolTrue
	case "issues":
		isPull = util.OptionalBoolFalse
	default:
		isPull = util.OptionalBoolNone
	}

	var includedAnyLabels []int64
	{

		labels := ctx.FormTrim("labels")
		var includedLabelNames []string
		if len(labels) > 0 {
			includedLabelNames = strings.Split(labels, ",")
		}
		includedAnyLabels, err = issues_model.GetLabelIDsByNames(ctx, includedLabelNames)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, "GetLabelIDsByNames", err.Error())
			return
		}
	}

	var includedMilestones []int64
	{
		milestones := ctx.FormTrim("milestones")
		var includedMilestoneNames []string
		if len(milestones) > 0 {
			includedMilestoneNames = strings.Split(milestones, ",")
		}
		includedMilestones, err = issues_model.GetMilestoneIDsByNames(ctx, includedMilestoneNames)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, "GetMilestoneIDsByNames", err.Error())
			return
		}
	}

	var projectID *int64
	if v := ctx.FormInt64("project"); v > 0 {
		projectID = &v
	}

	// this api is also used in UI,
	// so the default limit is set to fit UI needs
	limit := ctx.FormInt("limit")
	if limit == 0 {
		limit = setting.UI.IssuePagingNum
	} else if limit > setting.API.MaxResponseItems {
		limit = setting.API.MaxResponseItems
	}

	searchOpt := &issue_indexer.SearchOptions{
		Paginator: &db.ListOptions{
			Page:     ctx.FormInt("page"),
			PageSize: limit,
		},
		Keyword:             keyword,
		RepoIDs:             repoIDs,
		AllPublic:           allPublic,
		IsPull:              isPull,
		IsClosed:            isClosed,
		IncludedAnyLabelIDs: includedAnyLabels,
		MilestoneIDs:        includedMilestones,
		ProjectID:           projectID,
		SortBy:              issue_indexer.SortByCreatedDesc,
	}

	if since != 0 {
		searchOpt.UpdatedAfterUnix = &since
	}
	if before != 0 {
		searchOpt.UpdatedBeforeUnix = &before
	}

	if ctx.IsSigned {
		ctxUserID := ctx.Doer.ID
		if ctx.FormBool("created") {
			searchOpt.PosterID = &ctxUserID
		}
		if ctx.FormBool("assigned") {
			searchOpt.AssigneeID = &ctxUserID
		}
		if ctx.FormBool("mentioned") {
			searchOpt.MentionID = &ctxUserID
		}
		if ctx.FormBool("review_requested") {
			searchOpt.ReviewRequestedID = &ctxUserID
		}
		if ctx.FormBool("reviewed") {
			searchOpt.ReviewedID = &ctxUserID
		}
	}

	// FIXME: It's unsupported to sort by priority repo when searching by indexer,
	//        it's indeed an regression, but I think it is worth to support filtering by indexer first.
	_ = ctx.FormInt64("priority_repo_id")

	ids, total, err := issue_indexer.SearchIssues(ctx, searchOpt)
	if err != nil {
		ctx.Error(http.StatusInternalServerError, "SearchIssues", err.Error())
		return
	}
	issues, err := issues_model.GetIssuesByIDs(ctx, ids, true)
	if err != nil {
		ctx.Error(http.StatusInternalServerError, "FindIssuesByIDs", err.Error())
		return
	}

	ctx.SetTotalCountHeader(total)
	ctx.JSON(http.StatusOK, convert.ToIssueList(ctx, issues))
}

func getUserIDForFilter(ctx *context.Context, queryName string) int64 {
	userName := ctx.FormString(queryName)
	if len(userName) == 0 {
		return 0
	}

	user, err := user_model.GetUserByName(ctx, userName)
	if user_model.IsErrUserNotExist(err) {
		ctx.NotFound("", err)
		return 0
	}

	if err != nil {
		ctx.Error(http.StatusInternalServerError, err.Error())
		return 0
	}

	return user.ID
}

// ListIssues list the issues of a repository
func ListIssues(ctx *context.Context) {
	before, since, err := context.GetQueryBeforeSince(ctx.Base)
	if err != nil {
		ctx.Error(http.StatusUnprocessableEntity, err.Error())
		return
	}

	var isClosed util.OptionalBool
	switch ctx.FormString("state") {
	case "closed":
		isClosed = util.OptionalBoolTrue
	case "all":
		isClosed = util.OptionalBoolNone
	default:
		isClosed = util.OptionalBoolFalse
	}

	keyword := ctx.FormTrim("q")
	if strings.IndexByte(keyword, 0) >= 0 {
		keyword = ""
	}

	var labelIDs []int64
	if splitted := strings.Split(ctx.FormString("labels"), ","); len(splitted) > 0 {
		labelIDs, err = issues_model.GetLabelIDsInRepoByNames(ctx, ctx.Repo.Repository.ID, splitted)
		if err != nil {
			ctx.Error(http.StatusInternalServerError, err.Error())
			return
		}
	}

	var mileIDs []int64
	if part := strings.Split(ctx.FormString("milestones"), ","); len(part) > 0 {
		for i := range part {
			// uses names and fall back to ids
			// non existent milestones are discarded
			mile, err := issues_model.GetMilestoneByRepoIDANDName(ctx, ctx.Repo.Repository.ID, part[i])
			if err == nil {
				mileIDs = append(mileIDs, mile.ID)
				continue
			}
			if !issues_model.IsErrMilestoneNotExist(err) {
				ctx.Error(http.StatusInternalServerError, err.Error())
				return
			}
			id, err := strconv.ParseInt(part[i], 10, 64)
			if err != nil {
				continue
			}
			mile, err = issues_model.GetMilestoneByRepoID(ctx, ctx.Repo.Repository.ID, id)
			if err == nil {
				mileIDs = append(mileIDs, mile.ID)
				continue
			}
			if issues_model.IsErrMilestoneNotExist(err) {
				continue
			}
			ctx.Error(http.StatusInternalServerError, err.Error())
		}
	}

	var projectID *int64
	if v := ctx.FormInt64("project"); v > 0 {
		projectID = &v
	}

	var isPull util.OptionalBool
	switch ctx.FormString("type") {
	case "pulls":
		isPull = util.OptionalBoolTrue
	case "issues":
		isPull = util.OptionalBoolFalse
	default:
		isPull = util.OptionalBoolNone
	}

	// FIXME: we should be more efficient here
	createdByID := getUserIDForFilter(ctx, "created_by")
	if ctx.Written() {
		return
	}
	assignedByID := getUserIDForFilter(ctx, "assigned_by")
	if ctx.Written() {
		return
	}
	mentionedByID := getUserIDForFilter(ctx, "mentioned_by")
	if ctx.Written() {
		return
	}

	searchOpt := &issue_indexer.SearchOptions{
		Paginator: &db.ListOptions{
			Page:     ctx.FormInt("page"),
			PageSize: convert.ToCorrectPageSize(ctx.FormInt("limit")),
		},
		Keyword:        keyword,
		RepoIDs:        []int64{ctx.Repo.Repository.ID},
		IsPull:         isPull,
		IsClosed:       isClosed,
		ProjectBoardID: projectID,
		SortBy:         issue_indexer.SortByCreatedDesc,
	}
	if since != 0 {
		searchOpt.UpdatedAfterUnix = &since
	}
	if before != 0 {
		searchOpt.UpdatedBeforeUnix = &before
	}
	if len(labelIDs) == 1 && labelIDs[0] == 0 {
		searchOpt.NoLabelOnly = true
	} else {
		for _, labelID := range labelIDs {
			if labelID > 0 {
				searchOpt.IncludedLabelIDs = append(searchOpt.IncludedLabelIDs, labelID)
			} else {
				searchOpt.ExcludedLabelIDs = append(searchOpt.ExcludedLabelIDs, -labelID)
			}
		}
	}

	if len(mileIDs) == 1 && mileIDs[0] == db.NoConditionID {
		searchOpt.MilestoneIDs = []int64{0}
	} else {
		searchOpt.MilestoneIDs = mileIDs
	}

	if createdByID > 0 {
		searchOpt.PosterID = &createdByID
	}
	if assignedByID > 0 {
		searchOpt.AssigneeID = &assignedByID
	}
	if mentionedByID > 0 {
		searchOpt.MentionID = &mentionedByID
	}

	ids, total, err := issue_indexer.SearchIssues(ctx, searchOpt)
	if err != nil {
		ctx.Error(http.StatusInternalServerError, "SearchIssues", err.Error())
		return
	}
	issues, err := issues_model.GetIssuesByIDs(ctx, ids, true)
	if err != nil {
		ctx.Error(http.StatusInternalServerError, "FindIssuesByIDs", err.Error())
		return
	}

	ctx.SetTotalCountHeader(total)
	ctx.JSON(http.StatusOK, convert.ToIssueList(ctx, issues))
}

func BatchDeleteIssues(ctx *context.Context) {
	issues := getActionIssues(ctx)
	if ctx.Written() {
		return
	}
	for _, issue := range issues {
		if err := issue_service.DeleteIssue(ctx, ctx.Doer, ctx.Repo.GitRepo, issue); err != nil {
			ctx.ServerError("DeleteIssue", err)
			return
		}
	}
	ctx.JSONOK()
}

// UpdateIssueStatus change issue's status
func UpdateIssueStatus(ctx *context.Context) {
	issues := getActionIssues(ctx)
	if ctx.Written() {
		return
	}

	var isClosed bool
	switch action := ctx.FormString("action"); action {
	case "open":
		isClosed = false
	case "close":
		isClosed = true
	default:
		log.Warn("Unrecognized action: %s", action)
	}

	if _, err := issues.LoadRepositories(ctx); err != nil {
		ctx.ServerError("LoadRepositories", err)
		return
	}
	if err := issues.LoadPullRequests(ctx); err != nil {
		ctx.ServerError("LoadPullRequests", err)
		return
	}

	for _, issue := range issues {
		if issue.IsPull && issue.PullRequest.HasMerged {
			continue
		}
		if issue.IsClosed != isClosed {
			if err := issue_service.ChangeStatus(ctx, issue, ctx.Doer, "", isClosed); err != nil {
				if issues_model.IsErrDependenciesLeft(err) {
					ctx.JSON(http.StatusPreconditionFailed, map[string]any{
						"error": ctx.Tr("repo.issues.dependency.issue_batch_close_blocked", issue.Index),
					})
					return
				}
				ctx.ServerError("ChangeStatus", err)
				return
			}
		}
	}
	ctx.JSONOK()
}

// NewComment create a comment for issue
func NewComment(ctx *context.Context) {
	form := web.GetForm(ctx).(*forms.CreateCommentForm)
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}

	if !ctx.IsSigned || (ctx.Doer.ID != issue.PosterID && !ctx.Repo.CanReadIssuesOrPulls(issue.IsPull)) {
		if log.IsTrace() {
			if ctx.IsSigned {
				issueType := "issues"
				if issue.IsPull {
					issueType = "pulls"
				}
				log.Trace("Permission Denied: User %-v not the Poster (ID: %d) and cannot read %s in Repo %-v.\n"+
					"User in Repo has Permissions: %-+v",
					ctx.Doer,
					issue.PosterID,
					issueType,
					ctx.Repo.Repository,
					ctx.Repo.Permission)
			} else {
				log.Trace("Permission Denied: Not logged in")
			}
		}

		ctx.Error(http.StatusForbidden)
		return
	}

	if issue.IsLocked && !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) && !ctx.Doer.IsAdmin {
		ctx.JSONError(ctx.Tr("repo.issues.comment_on_locked"))
		return
	}

	var attachments []string
	if setting.Attachment.Enabled {
		attachments = form.Files
	}

	if ctx.HasError() {
		ctx.JSONError(ctx.GetErrMsg())
		return
	}

	var comment *issues_model.Comment
	defer func() {
		// Check if issue admin/poster changes the status of issue.
		if (ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) || (ctx.IsSigned && issue.IsPoster(ctx.Doer.ID))) &&
			(form.Status == "reopen" || form.Status == "close") &&
			!(issue.IsPull && issue.PullRequest.HasMerged) {

			// Duplication and conflict check should apply to reopen pull request.
			var pr *issues_model.PullRequest

			if form.Status == "reopen" && issue.IsPull {
				pull := issue.PullRequest
				var err error
				pr, err = issues_model.GetUnmergedPullRequest(ctx, pull.HeadRepoID, pull.BaseRepoID, pull.HeadBranch, pull.BaseBranch, pull.Flow)
				if err != nil {
					if !issues_model.IsErrPullRequestNotExist(err) {
						ctx.JSONError(ctx.Tr("repo.issues.dependency.pr_close_blocked"))
						return
					}
				}

				// Regenerate patch and test conflict.
				if pr == nil {
					issue.PullRequest.HeadCommitID = ""
					pull_service.AddToTaskQueue(ctx, issue.PullRequest)
				}

				// check whether the ref of PR <refs/pulls/pr_index/head> in base repo is consistent with the head commit of head branch in the head repo
				// get head commit of PR
				if pull.Flow == issues_model.PullRequestFlowGithub {
					prHeadRef := pull.GetGitRefName()
					if err := pull.LoadBaseRepo(ctx); err != nil {
						ctx.ServerError("Unable to load base repo", err)
						return
					}
					prHeadCommitID, err := git.GetFullCommitID(ctx, pull.BaseRepo.RepoPath(), prHeadRef)
					if err != nil {
						ctx.ServerError("Get head commit Id of pr fail", err)
						return
					}

					// get head commit of branch in the head repo
					if err := pull.LoadHeadRepo(ctx); err != nil {
						ctx.ServerError("Unable to load head repo", err)
						return
					}
					if ok := git.IsBranchExist(ctx, pull.HeadRepo.RepoPath(), pull.BaseBranch); !ok {
						// todo localize
						ctx.JSONError("The origin branch is delete, cannot reopen.")
						return
					}
					headBranchRef := pull.GetGitHeadBranchRefName()
					headBranchCommitID, err := git.GetFullCommitID(ctx, pull.HeadRepo.RepoPath(), headBranchRef)
					if err != nil {
						ctx.ServerError("Get head commit Id of head branch fail", err)
						return
					}

					err = pull.LoadIssue(ctx)
					if err != nil {
						ctx.ServerError("load the issue of pull request error", err)
						return
					}

					if prHeadCommitID != headBranchCommitID {
						// force push to base repo
						err := git.Push(ctx, pull.HeadRepo.RepoPath(), git.PushOptions{
							Remote: pull.BaseRepo.RepoPath(),
							Branch: pull.HeadBranch + ":" + prHeadRef,
							Force:  true,
							Env:    repo_module.InternalPushingEnvironment(pull.Issue.Poster, pull.BaseRepo),
						})
						if err != nil {
							ctx.ServerError("force push error", err)
							return
						}
					}
				}
			}

			if pr != nil {
				ctx.Flash.Info(ctx.Tr("repo.pulls.open_unmerged_pull_exists", pr.Index))
			} else {
				isClosed := form.Status == "close"
				if err := issue_service.ChangeStatus(ctx, issue, ctx.Doer, "", isClosed); err != nil {
					log.Error("ChangeStatus: %v", err)

					if issues_model.IsErrDependenciesLeft(err) {
						if issue.IsPull {
							ctx.JSONError(ctx.Tr("repo.issues.dependency.pr_close_blocked"))
						} else {
							ctx.JSONError(ctx.Tr("repo.issues.dependency.issue_close_blocked"))
						}
						return
					}
				} else {
					if err := stopTimerIfAvailable(ctx, ctx.Doer, issue); err != nil {
						ctx.ServerError("CreateOrStopIssueStopwatch", err)
						return
					}

					log.Trace("Issue [%d] status changed to closed: %v", issue.ID, issue.IsClosed)
				}
			}
		}

		// Redirect to comment hashtag if there is any actual content.
		typeName := "issues"
		if issue.IsPull {
			typeName = "pulls"
		}
		if comment != nil {
			ctx.JSONRedirect(fmt.Sprintf("%s/%s/%d#%s", ctx.Repo.RepoLink, typeName, issue.Index, comment.HashTag()))
		} else {
			ctx.JSONRedirect(fmt.Sprintf("%s/%s/%d", ctx.Repo.RepoLink, typeName, issue.Index))
		}
	}()

	// Fix #321: Allow empty comments, as long as we have attachments.
	if len(form.Content) == 0 && len(attachments) == 0 {
		return
	}

	comment, err := issue_service.CreateIssueComment(ctx, ctx.Doer, ctx.Repo.Repository, issue, form.Content, attachments)
	if err != nil {
		ctx.ServerError("CreateIssueComment", err)
		return
	}

	log.Trace("Comment created: %d/%d/%d", ctx.Repo.Repository.ID, issue.ID, comment.ID)
}

// UpdateCommentContent change comment of issue's content
func UpdateCommentContent(ctx *context.Context) {
	comment, err := issues_model.GetCommentByID(ctx, ctx.ParamsInt64(":id"))
	if err != nil {
		ctx.NotFoundOrServerError("GetCommentByID", issues_model.IsErrCommentNotExist, err)
		return
	}

	if err := comment.LoadIssue(ctx); err != nil {
		ctx.NotFoundOrServerError("LoadIssue", issues_model.IsErrIssueNotExist, err)
		return
	}

	if comment.Issue.RepoID != ctx.Repo.Repository.ID {
		ctx.NotFound("CompareRepoID", issues_model.ErrCommentNotExist{})
		return
	}

	if !ctx.IsSigned || (ctx.Doer.ID != comment.PosterID && !ctx.Repo.CanWriteIssuesOrPulls(comment.Issue.IsPull)) {
		ctx.Error(http.StatusForbidden)
		return
	}

	if !comment.Type.HasContentSupport() {
		ctx.Error(http.StatusNoContent)
		return
	}

	oldContent := comment.Content
	comment.Content = ctx.FormString("content")
	if len(comment.Content) == 0 {
		ctx.JSON(http.StatusOK, map[string]any{
			"content": "",
		})
		return
	}
	if err = issue_service.UpdateComment(ctx, comment, ctx.Doer, oldContent); err != nil {
		ctx.ServerError("UpdateComment", err)
		return
	}

	if err := comment.LoadAttachments(ctx); err != nil {
		ctx.ServerError("LoadAttachments", err)
		return
	}

	// when the update request doesn't intend to update attachments (eg: change checkbox state), ignore attachment updates
	if !ctx.FormBool("ignore_attachments") {
		if err := updateAttachments(ctx, comment, ctx.FormStrings("files[]")); err != nil {
			ctx.ServerError("UpdateAttachments", err)
			return
		}
	}

	content, err := markdown.RenderString(&markup.RenderContext{
		Links: markup.Links{
			Base: ctx.FormString("context"), // FIXME: <- IS THIS SAFE ?
		},
		Metas:   ctx.Repo.Repository.ComposeMetas(ctx),
		GitRepo: ctx.Repo.GitRepo,
		Ctx:     ctx,
	}, comment.Content)
	if err != nil {
		ctx.ServerError("RenderString", err)
		return
	}

	ctx.JSON(http.StatusOK, map[string]any{
		"content":     content,
		"attachments": attachmentsHTML(ctx, comment.Attachments, comment.Content),
	})
}

// DeleteComment delete comment of issue
func DeleteComment(ctx *context.Context) {
	comment, err := issues_model.GetCommentByID(ctx, ctx.ParamsInt64(":id"))
	if err != nil {
		ctx.NotFoundOrServerError("GetCommentByID", issues_model.IsErrCommentNotExist, err)
		return
	}

	if err := comment.LoadIssue(ctx); err != nil {
		ctx.NotFoundOrServerError("LoadIssue", issues_model.IsErrIssueNotExist, err)
		return
	}

	if comment.Issue.RepoID != ctx.Repo.Repository.ID {
		ctx.NotFound("CompareRepoID", issues_model.ErrCommentNotExist{})
		return
	}

	if !ctx.IsSigned || (ctx.Doer.ID != comment.PosterID && !ctx.Repo.CanWriteIssuesOrPulls(comment.Issue.IsPull)) {
		ctx.Error(http.StatusForbidden)
		return
	} else if !comment.Type.HasContentSupport() {
		ctx.Error(http.StatusNoContent)
		return
	}

	if err = issue_service.DeleteComment(ctx, ctx.Doer, comment); err != nil {
		ctx.ServerError("DeleteComment", err)
		return
	}

	ctx.Status(http.StatusOK)
}

// ChangeIssueReaction create a reaction for issue
func ChangeIssueReaction(ctx *context.Context) {
	form := web.GetForm(ctx).(*forms.ReactionForm)
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}

	if !ctx.IsSigned || (ctx.Doer.ID != issue.PosterID && !ctx.Repo.CanReadIssuesOrPulls(issue.IsPull)) {
		if log.IsTrace() {
			if ctx.IsSigned {
				issueType := "issues"
				if issue.IsPull {
					issueType = "pulls"
				}
				log.Trace("Permission Denied: User %-v not the Poster (ID: %d) and cannot read %s in Repo %-v.\n"+
					"User in Repo has Permissions: %-+v",
					ctx.Doer,
					issue.PosterID,
					issueType,
					ctx.Repo.Repository,
					ctx.Repo.Permission)
			} else {
				log.Trace("Permission Denied: Not logged in")
			}
		}

		ctx.Error(http.StatusForbidden)
		return
	}

	if ctx.HasError() {
		ctx.ServerError("ChangeIssueReaction", errors.New(ctx.GetErrMsg()))
		return
	}

	switch ctx.Params(":action") {
	case "react":
		reaction, err := issues_model.CreateIssueReaction(ctx, ctx.Doer.ID, issue.ID, form.Content)
		if err != nil {
			if issues_model.IsErrForbiddenIssueReaction(err) {
				ctx.ServerError("ChangeIssueReaction", err)
				return
			}
			log.Info("CreateIssueReaction: %s", err)
			break
		}
		// Reload new reactions
		issue.Reactions = nil
		if err = issue.LoadAttributes(ctx); err != nil {
			log.Info("issue.LoadAttributes: %s", err)
			break
		}

		log.Trace("Reaction for issue created: %d/%d/%d", ctx.Repo.Repository.ID, issue.ID, reaction.ID)
	case "unreact":
		if err := issues_model.DeleteIssueReaction(ctx, ctx.Doer.ID, issue.ID, form.Content); err != nil {
			ctx.ServerError("DeleteIssueReaction", err)
			return
		}

		// Reload new reactions
		issue.Reactions = nil
		if err := issue.LoadAttributes(ctx); err != nil {
			log.Info("issue.LoadAttributes: %s", err)
			break
		}

		log.Trace("Reaction for issue removed: %d/%d", ctx.Repo.Repository.ID, issue.ID)
	default:
		ctx.NotFound(fmt.Sprintf("Unknown action %s", ctx.Params(":action")), nil)
		return
	}

	if len(issue.Reactions) == 0 {
		ctx.JSON(http.StatusOK, map[string]any{
			"empty": true,
			"html":  "",
		})
		return
	}

	html, err := ctx.RenderToString(tplReactions, map[string]any{
		"ctxData":   ctx.Data,
		"ActionURL": fmt.Sprintf("%s/issues/%d/reactions", ctx.Repo.RepoLink, issue.Index),
		"Reactions": issue.Reactions.GroupByType(),
	})
	if err != nil {
		ctx.ServerError("ChangeIssueReaction.HTMLString", err)
		return
	}
	ctx.JSON(http.StatusOK, map[string]any{
		"html": html,
	})
}

// ChangeCommentReaction create a reaction for comment
func ChangeCommentReaction(ctx *context.Context) {
	form := web.GetForm(ctx).(*forms.ReactionForm)
	comment, err := issues_model.GetCommentByID(ctx, ctx.ParamsInt64(":id"))
	if err != nil {
		ctx.NotFoundOrServerError("GetCommentByID", issues_model.IsErrCommentNotExist, err)
		return
	}

	if err := comment.LoadIssue(ctx); err != nil {
		ctx.NotFoundOrServerError("LoadIssue", issues_model.IsErrIssueNotExist, err)
		return
	}

	if comment.Issue.RepoID != ctx.Repo.Repository.ID {
		ctx.NotFound("CompareRepoID", issues_model.ErrCommentNotExist{})
		return
	}

	if !ctx.IsSigned || (ctx.Doer.ID != comment.PosterID && !ctx.Repo.CanReadIssuesOrPulls(comment.Issue.IsPull)) {
		if log.IsTrace() {
			if ctx.IsSigned {
				issueType := "issues"
				if comment.Issue.IsPull {
					issueType = "pulls"
				}
				log.Trace("Permission Denied: User %-v not the Poster (ID: %d) and cannot read %s in Repo %-v.\n"+
					"User in Repo has Permissions: %-+v",
					ctx.Doer,
					comment.Issue.PosterID,
					issueType,
					ctx.Repo.Repository,
					ctx.Repo.Permission)
			} else {
				log.Trace("Permission Denied: Not logged in")
			}
		}

		ctx.Error(http.StatusForbidden)
		return
	}

	if !comment.Type.HasContentSupport() {
		ctx.Error(http.StatusNoContent)
		return
	}

	switch ctx.Params(":action") {
	case "react":
		reaction, err := issues_model.CreateCommentReaction(ctx, ctx.Doer.ID, comment.Issue.ID, comment.ID, form.Content)
		if err != nil {
			if issues_model.IsErrForbiddenIssueReaction(err) {
				ctx.ServerError("ChangeIssueReaction", err)
				return
			}
			log.Info("CreateCommentReaction: %s", err)
			break
		}
		// Reload new reactions
		comment.Reactions = nil
		if err = comment.LoadReactions(ctx, ctx.Repo.Repository); err != nil {
			log.Info("comment.LoadReactions: %s", err)
			break
		}

		log.Trace("Reaction for comment created: %d/%d/%d/%d", ctx.Repo.Repository.ID, comment.Issue.ID, comment.ID, reaction.ID)
	case "unreact":
		if err := issues_model.DeleteCommentReaction(ctx, ctx.Doer.ID, comment.Issue.ID, comment.ID, form.Content); err != nil {
			ctx.ServerError("DeleteCommentReaction", err)
			return
		}

		// Reload new reactions
		comment.Reactions = nil
		if err = comment.LoadReactions(ctx, ctx.Repo.Repository); err != nil {
			log.Info("comment.LoadReactions: %s", err)
			break
		}

		log.Trace("Reaction for comment removed: %d/%d/%d", ctx.Repo.Repository.ID, comment.Issue.ID, comment.ID)
	default:
		ctx.NotFound(fmt.Sprintf("Unknown action %s", ctx.Params(":action")), nil)
		return
	}

	if len(comment.Reactions) == 0 {
		ctx.JSON(http.StatusOK, map[string]any{
			"empty": true,
			"html":  "",
		})
		return
	}

	html, err := ctx.RenderToString(tplReactions, map[string]any{
		"ctxData":   ctx.Data,
		"ActionURL": fmt.Sprintf("%s/comments/%d/reactions", ctx.Repo.RepoLink, comment.ID),
		"Reactions": comment.Reactions.GroupByType(),
	})
	if err != nil {
		ctx.ServerError("ChangeCommentReaction.HTMLString", err)
		return
	}
	ctx.JSON(http.StatusOK, map[string]any{
		"html": html,
	})
}

func addParticipant(poster *user_model.User, participants []*user_model.User) []*user_model.User {
	for _, part := range participants {
		if poster.ID == part.ID {
			return participants
		}
	}
	return append(participants, poster)
}

func filterXRefComments(ctx *context.Context, issue *issues_model.Issue) error {
	// Remove comments that the user has no permissions to see
	for i := 0; i < len(issue.Comments); {
		c := issue.Comments[i]
		if issues_model.CommentTypeIsRef(c.Type) && c.RefRepoID != issue.RepoID && c.RefRepoID != 0 {
			var err error
			// Set RefRepo for description in template
			c.RefRepo, err = repo_model.GetRepositoryByID(ctx, c.RefRepoID)
			if err != nil {
				return err
			}
			perm, err := access_model.GetUserRepoPermission(ctx, c.RefRepo, ctx.Doer)
			if err != nil {
				return err
			}
			if !perm.CanReadIssuesOrPulls(c.RefIsPull) {
				issue.Comments = append(issue.Comments[:i], issue.Comments[i+1:]...)
				continue
			}
		}
		i++
	}
	return nil
}

// GetIssueAttachments returns attachments for the issue
func GetIssueAttachments(ctx *context.Context) {
	issue := GetActionIssue(ctx)
	if ctx.Written() {
		return
	}
	attachments := make([]*api.Attachment, len(issue.Attachments))
	for i := 0; i < len(issue.Attachments); i++ {
		attachments[i] = convert.ToAttachment(ctx.Repo.Repository, issue.Attachments[i])
	}
	ctx.JSON(http.StatusOK, attachments)
}

// GetCommentAttachments returns attachments for the comment
func GetCommentAttachments(ctx *context.Context) {
	comment, err := issues_model.GetCommentByID(ctx, ctx.ParamsInt64(":id"))
	if err != nil {
		ctx.NotFoundOrServerError("GetCommentByID", issues_model.IsErrCommentNotExist, err)
		return
	}

	if err := comment.LoadIssue(ctx); err != nil {
		ctx.NotFoundOrServerError("LoadIssue", issues_model.IsErrIssueNotExist, err)
		return
	}

	if comment.Issue.RepoID != ctx.Repo.Repository.ID {
		ctx.NotFound("CompareRepoID", issues_model.ErrCommentNotExist{})
		return
	}

	if !ctx.Repo.Permission.CanReadIssuesOrPulls(comment.Issue.IsPull) {
		ctx.NotFound("CanReadIssuesOrPulls", issues_model.ErrCommentNotExist{})
		return
	}

	if !comment.Type.HasAttachmentSupport() {
		ctx.ServerError("GetCommentAttachments", fmt.Errorf("comment type %v does not support attachments", comment.Type))
		return
	}

	attachments := make([]*api.Attachment, 0)
	if err := comment.LoadAttachments(ctx); err != nil {
		ctx.ServerError("LoadAttachments", err)
		return
	}
	for i := 0; i < len(comment.Attachments); i++ {
		attachments = append(attachments, convert.ToAttachment(ctx.Repo.Repository, comment.Attachments[i]))
	}
	ctx.JSON(http.StatusOK, attachments)
}

func updateAttachments(ctx *context.Context, item any, files []string) error {
	var attachments []*repo_model.Attachment
	switch content := item.(type) {
	case *issues_model.Issue:
		attachments = content.Attachments
	case *issues_model.Comment:
		attachments = content.Attachments
	default:
		return fmt.Errorf("unknown Type: %T", content)
	}
	for i := 0; i < len(attachments); i++ {
		if util.SliceContainsString(files, attachments[i].UUID) {
			continue
		}
		if err := repo_model.DeleteAttachment(ctx, attachments[i], true); err != nil {
			return err
		}
	}
	var err error
	if len(files) > 0 {
		switch content := item.(type) {
		case *issues_model.Issue:
			err = issues_model.UpdateIssueAttachments(ctx, content.ID, files)
		case *issues_model.Comment:
			err = content.UpdateAttachments(ctx, files)
		default:
			return fmt.Errorf("unknown Type: %T", content)
		}
		if err != nil {
			return err
		}
	}
	switch content := item.(type) {
	case *issues_model.Issue:
		content.Attachments, err = repo_model.GetAttachmentsByIssueID(ctx, content.ID)
	case *issues_model.Comment:
		content.Attachments, err = repo_model.GetAttachmentsByCommentID(ctx, content.ID)
	default:
		return fmt.Errorf("unknown Type: %T", content)
	}
	return err
}

func attachmentsHTML(ctx *context.Context, attachments []*repo_model.Attachment, content string) string {
	attachHTML, err := ctx.RenderToString(tplAttachment, map[string]any{
		"ctxData":     ctx.Data,
		"Attachments": attachments,
		"Content":     content,
	})
	if err != nil {
		ctx.ServerError("attachmentsHTML.HTMLString", err)
		return ""
	}
	return attachHTML
}

// combineLabelComments combine the nearby label comments as one.
func combineLabelComments(issue *issues_model.Issue) {
	var prev, cur *issues_model.Comment
	for i := 0; i < len(issue.Comments); i++ {
		cur = issue.Comments[i]
		if i > 0 {
			prev = issue.Comments[i-1]
		}
		if i == 0 || cur.Type != issues_model.CommentTypeLabel ||
			(prev != nil && prev.PosterID != cur.PosterID) ||
			(prev != nil && cur.CreatedUnix-prev.CreatedUnix >= 60) {
			if cur.Type == issues_model.CommentTypeLabel && cur.Label != nil {
				if cur.Content != "1" {
					cur.RemovedLabels = append(cur.RemovedLabels, cur.Label)
				} else {
					cur.AddedLabels = append(cur.AddedLabels, cur.Label)
				}
			}
			continue
		}

		if cur.Label != nil { // now cur MUST be label comment
			if prev.Type == issues_model.CommentTypeLabel { // we can combine them only prev is a label comment
				if cur.Content != "1" {
					// remove labels from the AddedLabels list if the label that was removed is already
					// in this list, and if it's not in this list, add the label to RemovedLabels
					addedAndRemoved := false
					for i, label := range prev.AddedLabels {
						if cur.Label.ID == label.ID {
							prev.AddedLabels = append(prev.AddedLabels[:i], prev.AddedLabels[i+1:]...)
							addedAndRemoved = true
							break
						}
					}
					if !addedAndRemoved {
						prev.RemovedLabels = append(prev.RemovedLabels, cur.Label)
					}
				} else {
					// remove labels from the RemovedLabels list if the label that was added is already
					// in this list, and if it's not in this list, add the label to AddedLabels
					removedAndAdded := false
					for i, label := range prev.RemovedLabels {
						if cur.Label.ID == label.ID {
							prev.RemovedLabels = append(prev.RemovedLabels[:i], prev.RemovedLabels[i+1:]...)
							removedAndAdded = true
							break
						}
					}
					if !removedAndAdded {
						prev.AddedLabels = append(prev.AddedLabels, cur.Label)
					}
				}
				prev.CreatedUnix = cur.CreatedUnix
				// remove the current comment since it has been combined to prev comment
				issue.Comments = append(issue.Comments[:i], issue.Comments[i+1:]...)
				i--
			} else { // if prev is not a label comment, start a new group
				if cur.Content != "1" {
					cur.RemovedLabels = append(cur.RemovedLabels, cur.Label)
				} else {
					cur.AddedLabels = append(cur.AddedLabels, cur.Label)
				}
			}
		}
	}
}

// get all teams that current user can mention
func handleTeamMentions(ctx *context.Context) {
	if ctx.Doer == nil || !ctx.Repo.Owner.IsOrganization() {
		return
	}

	var isAdmin bool
	var err error
	var teams []*organization.Team
	org := organization.OrgFromUser(ctx.Repo.Owner)
	// Admin has super access.
	if ctx.Doer.IsAdmin {
		isAdmin = true
	} else {
		isAdmin, err = org.IsOwnedBy(ctx, ctx.Doer.ID)
		if err != nil {
			ctx.ServerError("IsOwnedBy", err)
			return
		}
	}

	if isAdmin {
		teams, err = org.LoadTeams(ctx)
		if err != nil {
			ctx.ServerError("LoadTeams", err)
			return
		}
	} else {
		teams, err = org.GetUserTeams(ctx, ctx.Doer.ID)
		if err != nil {
			ctx.ServerError("GetUserTeams", err)
			return
		}
	}

	ctx.Data["MentionableTeams"] = teams
	ctx.Data["MentionableTeamsOrg"] = ctx.Repo.Owner.Name
	ctx.Data["MentionableTeamsOrgAvatar"] = ctx.Repo.Owner.AvatarLink(ctx)
}

type userSearchInfo struct {
	UserID     int64  `json:"user_id"`
	UserName   string `json:"username"`
	AvatarLink string `json:"avatar_link"`
	FullName   string `json:"full_name"`
}

type userSearchResponse struct {
	Results []*userSearchInfo `json:"results"`
}

// IssuePosters get posters for current repo's issues/pull requests
func IssuePosters(ctx *context.Context) {
	issuePosters(ctx, false)
}

func PullPosters(ctx *context.Context) {
	issuePosters(ctx, true)
}

func issuePosters(ctx *context.Context, isPullList bool) {
	repo := ctx.Repo.Repository
	search := strings.TrimSpace(ctx.FormString("q"))
	posters, err := repo_model.GetIssuePostersWithSearch(ctx, repo, isPullList, search, setting.UI.DefaultShowFullName)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, err)
		return
	}

	if search == "" && ctx.Doer != nil {
		// the returned posters slice only contains limited number of users,
		// to make the current user (doer) can quickly filter their own issues, always add doer to the posters slice
		if !slices.ContainsFunc(posters, func(user *user_model.User) bool { return user.ID == ctx.Doer.ID }) {
			posters = append(posters, ctx.Doer)
		}
	}

	posters = MakeSelfOnTop(ctx.Doer, posters)

	resp := &userSearchResponse{}
	resp.Results = make([]*userSearchInfo, len(posters))
	for i, user := range posters {
		resp.Results[i] = &userSearchInfo{UserID: user.ID, UserName: user.Name, AvatarLink: user.AvatarLink(ctx)}
		if setting.UI.DefaultShowFullName {
			resp.Results[i].FullName = user.FullName
		}
	}
	ctx.JSON(http.StatusOK, resp)
}