package srv_videoinfo

import (
	"context"
	"fmt"
	"strings"
	"videoweb/pub/common/laosiji"
	"videoweb/pub/common/log"
	"videoweb/pub/common/srvdef"
	"videoweb/pub/common/utils"
	"videoweb/pub/models/videoinformationmod"
	"videoweb/web/webg"

	"go.mongodb.org/mongo-driver/bson"
)

// TranscodeVideo 手动提交主视频 H265 转码。
func TranscodeVideo(ctx context.Context, videoId int64) *srvdef.SrvErr {
	info, serr := videoinformationmod.FindOneVideoInformation(ctx, bson.M{
		videoinformationmod.FN.VideoInformation.Id: videoId,
	})
	if serr != nil {
		return serr
	}
	src := strings.TrimSpace(info.Video.Url)
	if src == "" {
		return srvdef.New(srvdef.Err, "", "该视频没有可转码的源地址")
	}
	if laosiji.LaosijiClient == nil || laosiji.LaosijiDomains == nil {
		return srvdef.New(srvdef.Err, "", "转码服务未就绪")
	}
	if info.HevcStatus == videoinformationmod.HevcStatusPending {
		return srvdef.New(srvdef.Err, "", "转码请求已提交，正在转码中，请勿重复提交")
	}
	if err := SubmitTranscodeVideo(ctx, videoId, src, info.Video.FileId); err != nil {
		return srvdef.New(srvdef.Err, "", "提交转码失败："+err.Error())
	}
	return nil
}

func buildTranscodeSourceURL(videoUrl string) string {
	name := strings.TrimSpace(videoUrl)
	if name == "" {
		return ""
	}
	if !strings.Contains(name, ".m3u8") {
		name += ".m3u8"
	}
	host := strings.TrimSpace(webg.Conf.WebM3u8Host)
	if host == "" {
		return ""
	}
	return utils.JoinUrlPath(host, "/api/web/m3u8/"+name)
}

// SubmitTranscodeVideo 提交主视频转码任务。
func SubmitTranscodeVideo(ctx context.Context, videoId int64, src, fileId string) error {
	fileURL := buildTranscodeSourceURL(src)
	if fileURL == "" {
		return fmt.Errorf("empty transcode source url, videoUrl:%s host:%s", src, webg.Conf.WebM3u8Host)
	}
	sd, err := laosiji.LaosijiDomains.Get(ctx)
	if err != nil {
		return err
	}
	result, err := laosiji.LaosijiClient.SubmitTranscoding(ctx, fileURL, fileId, *sd, videoId)
	if err != nil {
		return err
	}
	return applyTranscodeResult(ctx, videoId, result)
}

// RefreshTranscodeVideo 查询转码任务状态并回写。
func RefreshTranscodeVideo(ctx context.Context, videoId int64, src, fileId string) error {
	fileURL := buildTranscodeSourceURL(src)
	if fileURL == "" {
		return fmt.Errorf("empty transcode source url, videoUrl:%s host:%s", src, webg.Conf.WebM3u8Host)
	}
	sd, err := laosiji.LaosijiDomains.Get(ctx)
	if err != nil {
		return err
	}
	result, found, err := laosiji.LaosijiClient.QueryTranscoding(ctx, fileURL, fileId, *sd)
	if err != nil {
		return err
	}
	if !found {
		return nil
	}
	return applyTranscodeResult(ctx, videoId, result)
}

func applyTranscodeResult(ctx context.Context, videoId int64, result laosiji.TranscodeResult) error {
	log.Infof("==applyTranscodeResult===> result", log.Any("videoId", videoId), log.Any("result", result))
	var update bson.M
	switch {
	case result.Done:
		meta := toVideoMetaInfo(result.HevcMeta)
		if meta == nil {
			meta = &videoinformationmod.VideoMetaInfo{}
		}
		h265Url := normalizeH265UrlForSave(result.HevcURL)
		meta.M3u8URL = h265Url
		set := bson.M{
			videoinformationmod.FN.VideoInformation.HevcStatus:    videoinformationmod.HevcStatusSuccess,
			videoinformationmod.FN.VideoInformation.HevcMetaInfo:  meta,
			videoinformationmod.FN.VideoInformation.Video.H265Url: h265Url,
		}
		if result.PreviewVtt != "" {
			set[videoinformationmod.FN.VideoInformation.PreviewVtt] = result.PreviewVtt
		}
		if result.AudioFile != "" {
			set[videoinformationmod.FN.VideoInformation.AudioFile] = result.AudioFile
		}
		if result.SmartCover != "" {
			set[videoinformationmod.FN.VideoInformation.SmartCover] = result.SmartCover
		}
		update = bson.M{"$set": set}
	case result.Failed:
		update = bson.M{
			"$set": bson.M{videoinformationmod.FN.VideoInformation.HevcStatus: videoinformationmod.HevcStatusFailed},
			"$inc": bson.M{videoinformationmod.FN.VideoInformation.HevcFailCount: 1},
		}
	default:
		update = bson.M{"$set": bson.M{videoinformationmod.FN.VideoInformation.HevcStatus: videoinformationmod.HevcStatusPending}}
	}
	if serr := videoinformationmod.UpdateOneVideoInformation(ctx, bson.M{
		videoinformationmod.FN.VideoInformation.Id: videoId,
	}, update); serr != nil {
		return fmt.Errorf("update video transcode status: %v", serr)
	}
	return nil
}

func normalizeH265UrlForSave(url string) string {
	url = strings.TrimSpace(url)
	return strings.TrimPrefix(url, "/")
}

func toVideoMetaInfo(m *laosiji.MetaInfo) *videoinformationmod.VideoMetaInfo {
	if m == nil {
		return nil
	}
	return &videoinformationmod.VideoMetaInfo{
		Codec:           m.Codec,
		Profile:         m.Profile,
		Width:           m.Width,
		Height:          m.Height,
		Fps:             m.Fps,
		VideoBitrate:    m.VideoBitrate,
		PixFmt:          m.PixFmt,
		AudioCodec:      m.AudioCodec,
		AudioBitrate:    m.AudioBitrate,
		AudioSampleRate: m.AudioSampleRate,
		AudioChannels:   m.AudioChannels,
		Bitrate:         m.Bitrate,
		Size:            m.Size,
		Duration:        m.Duration,
	}
}