// Package youtube contains an uploader to push VoDs to a Youtube
// channel
package youtube

import (
	"context"
	"fmt"
	"path"
	"strings"
	"time"

	"github.com/sirupsen/logrus"
	"google.golang.org/api/option"
	"google.golang.org/api/youtube/v3"

	"git.luzifer.io/luzifer/publish-vod/pkg/uploader"
	vaultoauth2 "git.luzifer.io/luzifer/publish-vod/pkg/vault-oauth2"
	oauth4youtube "git.luzifer.io/luzifer/publish-vod/pkg/vault-oauth2/youtube"
	"github.com/Luzifer/go_helpers/v2/fieldcollection"
)

type (
	impl struct{}
)

var ptrStringEmpty = func(v string) *string { return &v }("")

// New creates a new Youtube Uploader
func New() uploader.Uploader { return impl{} }

func (impl) Prepare(ctx context.Context, opts uploader.Opts) error {
	_, ts, err := oauth4youtube.GetOAuth2Client(ctx, opts.Config.MustString("vaultKey", nil))
	if err != nil {
		return fmt.Errorf("getting oauth credentials: %w", err)
	}

	t, err := ts.Token()
	if err != nil {
		return fmt.Errorf("getting token to store: %w", err)
	}

	if err := vaultoauth2.SaveTokenToVault(opts.Config.MustString("vaultKey", nil), t); err != nil {
		return fmt.Errorf("storing token to vault: %w", err)
	}

	return nil
}

func (impl) UploadFile(ctx context.Context, opts uploader.Opts) error {
	client, ts, err := oauth4youtube.GetOAuth2Client(ctx, opts.Config.MustString("vaultKey", nil))
	if err != nil {
		return fmt.Errorf("getting oauth credentials: %w", err)
	}

	defer func() {
		t, err := ts.Token()
		if err != nil {
			logrus.WithError(err).Error("getting token to store back")
		}

		if err := vaultoauth2.SaveTokenToVault(opts.Config.MustString("vaultKey", nil), t); err != nil {
			logrus.WithError(err).Error("storing token back to vault")
		}
	}()

	service, err := youtube.NewService(ctx, option.WithHTTPClient(client))
	if err != nil {
		return fmt.Errorf("creating Youtube client: %w", err)
	}

	upload := &youtube.Video{
		Snippet: &youtube.VideoSnippet{
			CategoryId:           "20", // Gaming
			ChannelId:            opts.Config.MustString("channel", nil),
			DefaultAudioLanguage: "de",
			DefaultLanguage:      "de",
			Description:          opts.Config.MustString("description", ptrStringEmpty),
			LiveBroadcastContent: "none",
			Title:                strings.ReplaceAll(path.Base(opts.Filename), path.Ext(opts.Filename), ""),
		},
		Status: &youtube.VideoStatus{
			Embeddable:          true,
			License:             "youtube",
			MadeForKids:         false,
			PrivacyStatus:       "private",
			PublicStatsViewable: true,
		},
		RecordingDetails: &youtube.VideoRecordingDetails{
			RecordingDate: time.Now().Format(time.RFC3339),
		},
	}

	progressReader := opts.ProgressBar.NewProxyReader(opts.Content)

	resp, err := service.Videos.
		Insert([]string{"snippet", "status", "recordingDetails"}, upload).
		Media(progressReader).
		Do()
	if err != nil {
		return fmt.Errorf("inserting video: %w", err)
	}

	opts.FinalMessage("Video uploaded: https://youtu.be/%s", resp.Id)
	return nil
}

func (impl) ValidateConfig(config *fieldcollection.FieldCollection) error {
	for _, key := range []string{"channel", "vaultKey"} {
		if v, err := config.String(key); err != nil || v == "" {
			return fmt.Errorf("key %q must be non-empty string", key)
		}
	}
	return nil
}