// Copyright 2016-2018, Pulumi Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cmd

import (
	"context"

	"github.com/pkg/errors"
	"github.com/spf13/cobra"

	"github.com/pulumi/pulumi/pkg/backend"
	"github.com/pulumi/pulumi/pkg/backend/display"
	"github.com/pulumi/pulumi/pkg/engine"
	"github.com/pulumi/pulumi/pkg/resource"
	"github.com/pulumi/pulumi/pkg/util/cmdutil"
	"github.com/pulumi/pulumi/pkg/util/result"
)

func newRefreshCmd() *cobra.Command {
	var debug bool
	var expectNop bool
	var message string
	var stack string

	// Flags for engine.UpdateOptions.
	var diffDisplay bool
	var eventLogPath string
	var parallel int
	var showConfig bool
	var showReplacementSteps bool
	var showSames bool
	var skipPreview bool
	var suppressOutputs bool
	var yes bool
	var targets *[]string

	var cmd = &cobra.Command{
		Use:   "refresh",
		Short: "Refresh the resources in a stack",
		Long: "Refresh the resources in a stack.\n" +
			"\n" +
			"This command compares the current stack's resource state with the state known to exist in\n" +
			"the actual cloud provider. Any such changes are adopted into the current stack. Note that if\n" +
			"the program text isn't updated accordingly, subsequent updates may still appear to be out of\n" +
			"synch with respect to the cloud provider's source of truth.\n" +
			"\n" +
			"The program to run is loaded from the project in the current directory. Use the `-C` or\n" +
			"`--cwd` flag to use a different directory.",
		Args: cmdutil.NoArgs,
		Run: cmdutil.RunResultFunc(func(cmd *cobra.Command, args []string) result.Result {
			interactive := cmdutil.Interactive()
			if !interactive {
				yes = true // auto-approve changes, since we cannot prompt.
			}

			opts, err := updateFlagsToOptions(interactive, skipPreview, yes)
			if err != nil {
				return result.FromError(err)
			}

			var displayType = display.DisplayProgress
			if diffDisplay {
				displayType = display.DisplayDiff
			}

			opts.Display = display.Options{
				Color:                cmdutil.GetGlobalColorization(),
				ShowConfig:           showConfig,
				ShowReplacementSteps: showReplacementSteps,
				ShowSameResources:    showSames,
				SuppressOutputs:      suppressOutputs,
				IsInteractive:        interactive,
				Type:                 displayType,
				EventLogPath:         eventLogPath,
				Debug:                debug,
			}

			s, err := requireStack(stack, true, opts.Display, true /*setCurrent*/)
			if err != nil {
				return result.FromError(err)
			}

			proj, root, err := readProject()
			if err != nil {
				return result.FromError(err)
			}

			m, err := getUpdateMetadata(message, root)
			if err != nil {
				return result.FromError(errors.Wrap(err, "gathering environment metadata"))
			}

			sm, err := getStackSecretsManager(s)
			if err != nil {
				return result.FromError(errors.Wrap(err, "getting secrets manager"))
			}

			cfg, err := getStackConfiguration(s, sm)
			if err != nil {
				return result.FromError(errors.Wrap(err, "getting stack configuration"))
			}

			targetUrns := []resource.URN{}
			for _, t := range *targets {
				targetUrns = append(targetUrns, resource.URN(t))
			}

			opts.Engine = engine.UpdateOptions{
				Parallel:       parallel,
				Debug:          debug,
				UseLegacyDiff:  useLegacyDiff(),
				RefreshTargets: targetUrns,
			}

			changes, res := s.Refresh(commandContext(), backend.UpdateOperation{
				Proj:               proj,
				Root:               root,
				M:                  m,
				Opts:               opts,
				StackConfiguration: cfg,
				SecretsManager:     sm,
				Scopes:             cancellationScopes,
			})

			switch {
			case res != nil && res.Error() == context.Canceled:
				return result.FromError(errors.New("refresh cancelled"))
			case res != nil:
				return PrintEngineResult(res)
			case expectNop && changes != nil && changes.HasChanges():
				return result.FromError(errors.New("error: no changes were expected but changes occurred"))
			default:
				return nil
			}
		}),
	}

	cmd.PersistentFlags().BoolVarP(
		&debug, "debug", "d", false,
		"Print detailed debugging output during resource operations")
	cmd.PersistentFlags().BoolVar(
		&expectNop, "expect-no-changes", false,
		"Return an error if any changes occur during this update")
	cmd.PersistentFlags().StringVarP(
		&stack, "stack", "s", "",
		"The name of the stack to operate on. Defaults to the current stack")
	cmd.PersistentFlags().StringVar(
		&stackConfigFile, "config-file", "",
		"Use the configuration values in the specified file rather than detecting the file name")

	cmd.PersistentFlags().StringVarP(
		&message, "message", "m", "",
		"Optional message to associate with the update operation")

	targets = cmd.PersistentFlags().StringArrayP(
		"target", "t", []string{},
		"Specify a single resource URN to refresh. Multiple resource can be specified using: --target urn1 --target urn2")

	// Flags for engine.UpdateOptions.
	cmd.PersistentFlags().BoolVar(
		&diffDisplay, "diff", false,
		"Display operation as a rich diff showing the overall change")
	cmd.PersistentFlags().IntVarP(
		&parallel, "parallel", "p", defaultParallel,
		"Allow P resource operations to run in parallel at once (1 for no parallelism). Defaults to unbounded.")
	cmd.PersistentFlags().BoolVar(
		&showReplacementSteps, "show-replacement-steps", false,
		"Show detailed resource replacement creates and deletes instead of a single step")
	cmd.PersistentFlags().BoolVar(
		&showSames, "show-sames", false,
		"Show resources that needn't be updated because they haven't changed, alongside those that do")
	cmd.PersistentFlags().BoolVar(
		&skipPreview, "skip-preview", false,
		"Do not perform a preview before performing the refresh")
	cmd.PersistentFlags().BoolVar(
		&suppressOutputs, "suppress-outputs", false,
		"Suppress display of stack outputs (in case they contain sensitive values)")
	cmd.PersistentFlags().BoolVarP(
		&yes, "yes", "y", false,
		"Automatically approve and perform the refresh after previewing it")

	if hasDebugCommands() {
		cmd.PersistentFlags().StringVar(
			&eventLogPath, "event-log", "",
			"Log events to a file at this path")
	}
	return cmd
}
