// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
// Copyright (C) 2022 Tulir Asokan
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package database

import (
	"database/sql"
	"sync"
	"time"

	"go.mau.fi/util/dbutil"
	"go.mau.fi/whatsmeow/types"
	log "maunium.net/go/maulogger/v2"

	"maunium.net/go/mautrix/id"
)

type UserQuery struct {
	db  *Database
	log log.Logger
}

func (uq *UserQuery) New() *User {
	return &User{
		db:  uq.db,
		log: uq.log,

		lastReadCache: make(map[PortalKey]time.Time),
		inSpaceCache:  make(map[PortalKey]bool),
	}
}

func (uq *UserQuery) GetAll() (users []*User) {
	rows, err := uq.db.Query(`SELECT mxid, username, agent, device, management_room, space_room, phone_last_seen, phone_last_pinged, timezone FROM "user"`)
	if err != nil || rows == nil {
		return nil
	}
	defer rows.Close()
	for rows.Next() {
		users = append(users, uq.New().Scan(rows))
	}
	return
}

func (uq *UserQuery) GetByMXID(userID id.UserID) *User {
	row := uq.db.QueryRow(`SELECT mxid, username, agent, device, management_room, space_room, phone_last_seen, phone_last_pinged, timezone FROM "user" WHERE mxid=$1`, userID)
	if row == nil {
		return nil
	}
	return uq.New().Scan(row)
}

func (uq *UserQuery) GetByUsername(username string) *User {
	row := uq.db.QueryRow(`SELECT mxid, username, agent, device, management_room, space_room, phone_last_seen, phone_last_pinged, timezone FROM "user" WHERE username=$1`, username)
	if row == nil {
		return nil
	}
	return uq.New().Scan(row)
}

type User struct {
	db  *Database
	log log.Logger

	MXID            id.UserID
	JID             types.JID
	ManagementRoom  id.RoomID
	SpaceRoom       id.RoomID
	PhoneLastSeen   time.Time
	PhoneLastPinged time.Time
	Timezone        string

	lastReadCache     map[PortalKey]time.Time
	lastReadCacheLock sync.Mutex
	inSpaceCache      map[PortalKey]bool
	inSpaceCacheLock  sync.Mutex
}

func (user *User) Scan(row dbutil.Scannable) *User {
	var username, timezone sql.NullString
	var device, agent sql.NullByte
	var phoneLastSeen, phoneLastPinged sql.NullInt64
	err := row.Scan(&user.MXID, &username, &agent, &device, &user.ManagementRoom, &user.SpaceRoom, &phoneLastSeen, &phoneLastPinged, &timezone)
	if err != nil {
		if err != sql.ErrNoRows {
			user.log.Errorln("Database scan failed:", err)
		}
		return nil
	}
	user.Timezone = timezone.String
	if len(username.String) > 0 {
		user.JID = types.NewADJID(username.String, agent.Byte, device.Byte)
	}
	if phoneLastSeen.Valid {
		user.PhoneLastSeen = time.Unix(phoneLastSeen.Int64, 0)
	}
	if phoneLastPinged.Valid {
		user.PhoneLastPinged = time.Unix(phoneLastPinged.Int64, 0)
	}
	return user
}

func (user *User) usernamePtr() *string {
	if !user.JID.IsEmpty() {
		return &user.JID.User
	}
	return nil
}

func (user *User) agentPtr() *uint8 {
	if !user.JID.IsEmpty() {
		zero := uint8(0)
		return &zero
	}
	return nil
}

func (user *User) devicePtr() *uint8 {
	if !user.JID.IsEmpty() {
		device := uint8(user.JID.Device)
		return &device
	}
	return nil
}

func (user *User) phoneLastSeenPtr() *int64 {
	if user.PhoneLastSeen.IsZero() {
		return nil
	}
	ts := user.PhoneLastSeen.Unix()
	return &ts
}

func (user *User) phoneLastPingedPtr() *int64 {
	if user.PhoneLastPinged.IsZero() {
		return nil
	}
	ts := user.PhoneLastPinged.Unix()
	return &ts
}

func (user *User) Insert() {
	_, err := user.db.Exec(`INSERT INTO "user" (mxid, username, agent, device, management_room, space_room, phone_last_seen, phone_last_pinged, timezone) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)`,
		user.MXID, user.usernamePtr(), user.agentPtr(), user.devicePtr(), user.ManagementRoom, user.SpaceRoom, user.phoneLastSeenPtr(), user.phoneLastPingedPtr(), user.Timezone)
	if err != nil {
		user.log.Warnfln("Failed to insert %s: %v", user.MXID, err)
	}
}

func (user *User) Update() {
	_, err := user.db.Exec(`UPDATE "user" SET username=$1, agent=$2, device=$3, management_room=$4, space_room=$5, phone_last_seen=$6, phone_last_pinged=$7, timezone=$8 WHERE mxid=$9`,
		user.usernamePtr(), user.agentPtr(), user.devicePtr(), user.ManagementRoom, user.SpaceRoom, user.phoneLastSeenPtr(), user.phoneLastPingedPtr(), user.Timezone, user.MXID)
	if err != nil {
		user.log.Warnfln("Failed to update %s: %v", user.MXID, err)
	}
}

func (user *User) GetLastAppStateKeyID() ([]byte, error) {
	var keyID []byte
	err := user.db.QueryRow("SELECT key_id FROM whatsmeow_app_state_sync_keys ORDER BY timestamp DESC LIMIT 1").Scan(&keyID)
	return keyID, err
}