package view

import (
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"time"

	"github.com/MakeNowJust/heredoc"
	"github.com/cli/cli/api"
	"github.com/cli/cli/internal/ghrepo"
	"github.com/cli/cli/pkg/cmd/run/download"
	"github.com/cli/cli/pkg/cmd/run/shared"
	"github.com/cli/cli/pkg/cmdutil"
	"github.com/cli/cli/pkg/iostreams"
	"github.com/cli/cli/utils"
	"github.com/spf13/cobra"
)

type ViewOptions struct {
	HttpClient func() (*http.Client, error)
	IO         *iostreams.IOStreams
	BaseRepo   func() (ghrepo.Interface, error)

	RunID      string
	Verbose    bool
	ExitStatus bool

	Prompt bool

	Now func() time.Time
}

func NewCmdView(f *cmdutil.Factory, runF func(*ViewOptions) error) *cobra.Command {
	opts := &ViewOptions{
		IO:         f.IOStreams,
		HttpClient: f.HttpClient,
		Now:        time.Now,
	}
	cmd := &cobra.Command{
		Use:    "view [<run-id>]",
		Short:  "View a summary of a workflow run",
		Args:   cobra.MaximumNArgs(1),
		Hidden: true,
		Example: heredoc.Doc(`
		  # Interactively select a run to view
		  $ gh run view

		  # View a specific run
		  $ gh run view 0451

		  # Exit non-zero if a run failed
		  $ gh run view 0451 -e && echo "job pending or passed"
		`),
		RunE: func(cmd *cobra.Command, args []string) error {
			// support `-R, --repo` override
			opts.BaseRepo = f.BaseRepo

			if len(args) > 0 {
				opts.RunID = args[0]
			} else if !opts.IO.CanPrompt() {
				return &cmdutil.FlagError{Err: errors.New("run ID required when not running interactively")}
			} else {
				opts.Prompt = true
			}

			if runF != nil {
				return runF(opts)
			}
			return runView(opts)
		},
	}
	cmd.Flags().BoolVarP(&opts.Verbose, "verbose", "v", false, "Show job steps")
	// TODO should we try and expose pending via another exit code?
	cmd.Flags().BoolVar(&opts.ExitStatus, "exit-status", false, "Exit with non-zero status if run failed")

	return cmd
}

func runView(opts *ViewOptions) error {
	c, err := opts.HttpClient()
	if err != nil {
		return fmt.Errorf("failed to create http client: %w", err)
	}
	client := api.NewClientFromHTTP(c)

	repo, err := opts.BaseRepo()
	if err != nil {
		return fmt.Errorf("failed to determine base repo: %w", err)
	}

	runID := opts.RunID

	if opts.Prompt {
		cs := opts.IO.ColorScheme()
		// TODO arbitrary limit
		runs, err := shared.GetRuns(client, repo, 10)
		if err != nil {
			return fmt.Errorf("failed to get runs: %w", err)
		}
		runID, err = shared.PromptForRun(cs, runs)
		if err != nil {
			return err
		}
	}

	opts.IO.StartProgressIndicator()
	defer opts.IO.StopProgressIndicator()

	run, err := shared.GetRun(client, repo, runID)
	if err != nil {
		return fmt.Errorf("failed to get run: %w", err)
	}

	prNumber := ""
	number, err := shared.PullRequestForRun(client, repo, *run)
	if err == nil {
		prNumber = fmt.Sprintf(" #%d", number)
	}

	jobs, err := shared.GetJobs(client, repo, *run)
	if err != nil {
		return fmt.Errorf("failed to get jobs: %w", err)
	}

	artifacts, err := download.ListArtifacts(c, repo, strconv.Itoa(run.ID))
	if err != nil {
		return fmt.Errorf("failed to get artifacts: %w", err)
	}

	var annotations []shared.Annotation

	var annotationErr error
	var as []shared.Annotation
	for _, job := range jobs {
		as, annotationErr = shared.GetAnnotations(client, repo, job)
		if annotationErr != nil {
			break
		}
		annotations = append(annotations, as...)
	}

	opts.IO.StopProgressIndicator()
	if annotationErr != nil {
		return fmt.Errorf("failed to get annotations: %w", annotationErr)
	}

	out := opts.IO.Out
	cs := opts.IO.ColorScheme()

	ago := opts.Now().Sub(run.CreatedAt)

	fmt.Fprintln(out)
	fmt.Fprintln(out, shared.RenderRunHeader(cs, *run, utils.FuzzyAgo(ago), prNumber))
	fmt.Fprintln(out)

	if len(jobs) == 0 && run.Conclusion == shared.Failure {
		fmt.Fprintf(out, "%s %s\n",
			cs.FailureIcon(),
			cs.Bold("This run likely failed because of a workflow file issue."))

		fmt.Fprintln(out)
		fmt.Fprintf(out, "For more information, see: %s\n", cs.Bold(run.URL))

		if opts.ExitStatus {
			return cmdutil.SilentError
		}
		return nil
	}

	fmt.Fprintln(out, cs.Bold("JOBS"))

	fmt.Fprintln(out, shared.RenderJobs(cs, jobs, opts.Verbose))

	if len(annotations) > 0 {
		fmt.Fprintln(out)
		fmt.Fprintln(out, cs.Bold("ANNOTATIONS"))
		fmt.Fprintln(out, shared.RenderAnnotations(cs, annotations))
	}

	var validArtifacts []download.Artifact
	for _, a := range artifacts {
		if !a.Expired {
			validArtifacts = append(validArtifacts, a)
		}
	}
	if len(validArtifacts) > 0 {
		fmt.Fprintln(out)
		fmt.Fprintln(out, cs.Bold("ARTIFACTS"))
		for _, a := range validArtifacts {
			fmt.Fprintln(out, a.Name)
		}
	}

	fmt.Fprintln(out)
	fmt.Fprintln(out, "For more information about a job, try: gh job view <job-id>")
	fmt.Fprintf(out, cs.Gray("view this run on GitHub: %s\n"), run.URL)

	if opts.ExitStatus && shared.IsFailureState(run.Conclusion) {
		return cmdutil.SilentError
	}

	return nil
}