package videomoderation

import (
	"encoding/json"
	"fmt"
	"net/http"
	"service/api/consts"
	video_moderation_proto "service/api/proto/video_moderation/proto"
	video_moderation_task_proto "service/api/proto/video_moderation_task/proto"
	"service/bizcommon/util"
	"service/dbstruct"
	"service/library/logger"
	"strings"

	green20220302 "github.com/alibabacloud-go/green-20220302/client"
	"github.com/gin-gonic/gin"
	goproto "google.golang.org/protobuf/proto"
)

func HandleVideoModerationContent(content string) (err error) {
	// 获取ResponseBody，解析出batchId和视频审核表id
	logger.Info("Unmarshaling ResponseBody...")
	result := &green20220302.VideoModerationResultResponseBody{}
	err = json.Unmarshal([]byte(content), result)
	if err != nil {
		logger.Error("json unmarshal failed, err: %v", err)
		return
	}

	err = handleVideoModerationResultResponseBody(result)
	return
}

func handleVideoModerationResultResponseBody(result *green20220302.VideoModerationResultResponseBody) (err error) {

	isTaskCompleted := false
	isActionCompleted := false
	action := &VideoModerationAction{}

	// 1.立即在视频审核表更新该次审核结果
	logger.Info("Handling its moderation record...")
	isPassed, videomoderation, err := handleVideoModeration(result)
	if err != nil {
		logger.Error("handleVideoModeration fail: %v", err)
	}

	// 2.通过batchId从缓存的批次任务控制块里获取信息
	logger.Info("Retriving batch task control block...")
	btcb, ok := getBtcb(videomoderation.GetBatchId())
	if !ok || btcb == nil {
		// 若任务控制块已不存在，则认为该审核任务已过期
		logger.Info("video moderation batch task of batch_id %v has expired and been removed, you may want to rerun it from xxl-job...")
		return
	}

	// 3.取出task
	logger.Info("Retriving its moderation task...")
	tcb, ok := btcb.VidmodId2taskMap[videomoderation.GetId()]
	if !ok || tcb == nil {
		logger.Info("video moderation task of id %v has expired and been removed, this is abnormal, you may want to check your code...")
		return
	}

	// 4.在task中记录本分片结果，并累积已到达的分片数，直到所有分片到达，决定该任务是否成功(非分片任务分片数为1)
	logger.Info("Recording it to task...")
	isTaskCompleted = handleTask(tcb, isPassed, videomoderation)

	// 5.通过task的actionId，去actionId-[]*task的map查出本批次对该字段的动作链，更新其中关于自己的状态
	logger.Info("Recording the task result...")
	if isTaskCompleted {
		isActionCompleted, action = handleTaskAction(tcb, btcb.ActionMap)
	}

	// 6.等待所有动作链元素均已抵达，判定本批次对该字段的操作是否成功
	logger.Info("Recording the action result...")
	if isActionCompleted {
		if err = finalizeTask(action); err != nil {
			logger.Error("finalizeTask fail: %v", err)
		}
		logger.Info("video moderation task of id %v has finished...", tcb.VideoModerationTask.GetId())

		// 如果批次任务已经完成，从map中移除该批次任务控制块
		batchId := btcb.BatchId
		btcb.FinishATask()
		if btcb.IsBatchFinished() {
			removeBtcb(btcb.BatchId)
		}
		logger.Info("video moderation batch task of batch_id %v has finished and been removed, all referenced request will be regarded as expired...", batchId)
	}

	return nil
}

func handleVideoModeration(result *green20220302.VideoModerationResultResponseBody) (isPassed bool, videomoderation *dbstruct.VideoModeration, err error) {

	dataId := util.DerefString(result.Data.DataId)
	batchId := dataId[:14]
	videomoderationId := dataId[14:]
	isPassed = true

	videomoderation = &dbstruct.VideoModeration{
		Id: goproto.String(videomoderationId),
	}

	if util.DerefInt32(result.Code) != http.StatusOK {
		// 阿里云服务失败
		logger.Error("response not success. status: %d", util.DerefInt32(result.Code))
		isPassed = false
		videomoderation.Status = goproto.Int64(consts.VideoModeration_ServiceFailed)
		videomoderation.Remarks = goproto.String(fmt.Sprintf("任务失败:%v", util.DerefString(result.Message)))

	} else {
		// 阿里云服务成功
		frameResult := result.Data.FrameResult
		audioResult := result.Data.AudioResult

		// 解析信息
		isFramesPassed := true
		isAudioPassed := true
		if frameResult != nil {
			var frameSummaries []*dbstruct.FrameSummary
			frameSummaries, isFramesPassed = buildFrameSummaries(frameResult.FrameSummarys)
			frameDetails := buildFrameDetails(frameResult.Frames)
			videomoderation.SetFrameSummaries(frameSummaries).SetFrameDetails(frameDetails)
			videomoderation.FrameNum = frameResult.FrameNum
		}
		if audioResult != nil {
			var audioSummaries []*dbstruct.AudioSummary
			audioSummaries, isAudioPassed = buildAudioSummaries(audioResult.AudioSummarys)
			audioDetails := buildAudioDetails(audioResult.SliceDetails)
			videomoderation.SetAudioSummaries(audioSummaries).SetAudioDetails(audioDetails)
		}

		// 判定检测结果
		if isFramesPassed && isAudioPassed {
			videomoderation.Status = goproto.Int64(consts.VideoModeration_Passed)
		} else {
			videomoderation.Status = goproto.Int64(consts.VideoModeration_Rejected)
			isPassed = false
		}
	}

	if err = _DefaultVideoModeration.OpUpdate(&gin.Context{}, &video_moderation_proto.OpUpdateReq{
		VideoModeration: videomoderation,
	}); err != nil {
		logger.Error("_DefaultVideoModeration OpUpdate fail: %v\n", err)
		return
	}

	videomoderation.BatchId = goproto.String(batchId)
	switch videomoderation.GetStatus() {
	case consts.VideoModeration_Rejected:
		sb := &strings.Builder{}
		for _, summary := range videomoderation.GetFrameSummaries() {
			if summary.GetLabel() != VideoModerationPassLabel {
				sb.WriteString(fmt.Sprintf("共检测到%d处%s的画面；", summary.GetLabelSum(), FrameLabelDescMap[summary.GetLabel()]))
			}
		}
		for _, summary := range videomoderation.GetAudioSummaries() {
			if summary.GetLabel() != AudioModerationPassLabel {
				sb.WriteString(fmt.Sprintf("共检测到%d处%s的音频；", summary.GetLabelSum(), AudioLabelDescMap[summary.GetLabel()]))
			}
		}
		videomoderation.Description = sb.String()
	case consts.VideoModeration_ServiceFailed:
		videomoderation.Description = videomoderation.GetRemarks()
	}

	return
}

func buildFrameSummaries(summaries []*green20220302.VideoModerationResultResponseBodyDataFrameResultFrameSummarys) (frameSummaries []*dbstruct.FrameSummary, isPassed bool) {
	isPassed = true
	frameSummaries = make([]*dbstruct.FrameSummary, 0)
	for _, summary := range summaries {
		if summary != nil {
			frameSummaries = append(frameSummaries, &dbstruct.FrameSummary{
				Label:    summary.Label,
				LabelSum: summary.LabelSum,
			})
			if util.DerefString(summary.Label) != VideoModerationPassLabel {
				isPassed = false
			}
		}
	}
	return
}

func buildFrameDetails(details []*green20220302.VideoModerationResultResponseBodyDataFrameResultFrames) (frameDetails []*dbstruct.FrameDetail) {
	frameDetails = make([]*dbstruct.FrameDetail, 0)
	for _, detail := range details {
		if detail != nil {
			frameDetail := &dbstruct.FrameDetail{
				Offset: detail.Offset,
			}
			frameDetail.SetFrameServiceDetails(buildFrameServiceDetails(detail.Results))
			frameDetails = append(frameDetails, frameDetail)
		}
	}
	return
}

func buildFrameServiceDetails(details []*green20220302.VideoModerationResultResponseBodyDataFrameResultFramesResults) (frameServiceDetails []*dbstruct.FrameServiceDetail) {
	frameServiceDetails = make([]*dbstruct.FrameServiceDetail, 0)
	for _, detail := range details {
		if detail != nil {
			frameServiceDetail := &dbstruct.FrameServiceDetail{
				Service: detail.Service,
			}
			frameServiceDetail.SetFrameLabelDetails(buildFrameLabelDetails(detail.Result))
			frameServiceDetails = append(frameServiceDetails, frameServiceDetail)
		}
	}
	return
}

func buildFrameLabelDetails(details []*green20220302.VideoModerationResultResponseBodyDataFrameResultFramesResultsResult) (frameLabelDetails []*dbstruct.FrameLabelDetail) {
	frameLabelDetails = make([]*dbstruct.FrameLabelDetail, 0)
	for _, detail := range details {
		if detail != nil {
			frameLabelDetails = append(frameLabelDetails, &dbstruct.FrameLabelDetail{
				Confidence: detail.Confidence,
				Label:      detail.Label,
			})
		}
	}
	return
}

func buildAudioSummaries(summaries []*green20220302.VideoModerationResultResponseBodyDataAudioResultAudioSummarys) (audioSummaries []*dbstruct.AudioSummary, isPassed bool) {
	isPassed = true
	audioSummaries = make([]*dbstruct.AudioSummary, 0)
	for _, summary := range summaries {
		if summary != nil {
			audioSummaries = append(audioSummaries, &dbstruct.AudioSummary{
				Label:    summary.Label,
				LabelSum: summary.LabelSum,
			})
			if util.DerefString(summary.Label) != AudioModerationPassLabel {
				isPassed = false
			}
		}
	}
	return
}

func buildAudioDetails(details []*green20220302.VideoModerationResultResponseBodyDataAudioResultSliceDetails) (audioDetails []*dbstruct.AudioDetail) {
	audioDetails = make([]*dbstruct.AudioDetail, 0)
	for _, detail := range details {
		if detail != nil {
			audioDetails = append(audioDetails, &dbstruct.AudioDetail{
				EndTime:        detail.EndTime,
				EndTimestamp:   detail.EndTimestamp,
				Extend:         detail.Extend,
				Labels:         detail.Labels,
				RiskTips:       detail.RiskTips,
				RiskWords:      detail.RiskWords,
				Score:          detail.Score,
				StartTime:      detail.StartTime,
				StartTimestamp: detail.StartTimestamp,
				Text:           detail.Text,
			})
		}
	}
	return
}

// 处理task，若task已分片，在task中记录本分片结果，并累积已到达的分片数，直到所有分片到达，决定该任务是否成功
func handleTask(task *VideoModerationTaskControlBlock, isPassed bool, videoMod *dbstruct.VideoModeration) (isTaskCompleted bool) {
	task.VideoModerationTask.AuditedMediaResults = append(task.VideoModerationTask.AuditedMediaResults, isPassed)
	task.VideoModerationTask.Description = append(task.VideoModerationTask.Description, videoMod.Description)
	task.IsTaskPassed = task.IsTaskPassed && isPassed
	task.AuditedFragmentsNum++

	return task.AuditedFragmentsNum <= int(task.VideoModerationTask.GetFragmentsNum())
}

// 通过task的actionId查出action, 通知该task已完成
func handleTaskAction(task *VideoModerationTaskControlBlock, actionMap map[string]*VideoModerationAction) (isActionCompleted bool, action *VideoModerationAction) {
	action = actionMap[task.ActionId]
	action.AuditedTaskNum++

	isActionCompleted = action.TaskNum <= action.AuditedTaskNum
	return

}

// 等待所有动作链元素均已抵达，判定本批次对该字段的操作是否成功
func finalizeTask(action *VideoModerationAction) (err error) {

	lastValidTask, lastValidTaskIndex := action.TaskChain[0], 0 // 仅在动作链终态不成功时有意义，表示最后一个可以用以回退的失败任务和它的索引
	passTaskIds := make([]string, 0)                            // 所有已审核成功的任务的taskId
	expiredTaskIds := make([]string, 0)                         // 所有已失效任务的taskId，失效任务是指那些前驱任务依然失败的失败任务，或之后已有任务成功的失败任务，这些任务已失去实际意义，不可以用来回退
	statuses := make([]int64, len(action.TaskChain))            // 所有任务的终态状态，成功，回退，或失效
	isActionInPassedStatus := true                              // 当前动作链是否处于成功中
	for i, task := range action.TaskChain {
		if !task.IsTaskPassed { // 动作链检测到失败任务
			if isActionInPassedStatus { // 若动作链处于成功状态，则这是目前为止，最后一个可以用于回退的任务
				lastValidTask, lastValidTaskIndex = task, i
				statuses[i] = consts.VideoModeration_Rollbacked
				isActionInPassedStatus = false
			} else { // 否则，若动作链处于失败状态，则该任务已失效
				statuses[i] = consts.VideoModeration_Expired
				expiredTaskIds = append(expiredTaskIds, task.VideoModerationTask.GetId())
			}
		} else { // 若动作链检测到成功任务，则重置动作链任务态，并将最后有效任务标志为失效（它已不再用于回退）
			passTaskIds = append(passTaskIds, task.VideoModerationTask.GetId())
			statuses[i] = consts.VideoModeration_Passed
			isActionInPassedStatus = true
			if statuses[lastValidTaskIndex] == consts.VideoModeration_Rollbacked {
				statuses[lastValidTaskIndex] = consts.VideoModeration_Expired
				expiredTaskIds = append(expiredTaskIds, action.TaskChain[lastValidTaskIndex].VideoModerationTask.GetId())
			}
		}
	}

	// 判定任务链终态，终态非成功，执行回退操作，记录到数据库中
	if !action.IsPassed() {
		if err = executeRollBack(lastValidTask.VideoModerationTask); err != nil {
			return
		}
	}

	// 更新所有任务状态
	if err = updatePassedTasks(passTaskIds); err != nil {
		return
	}
	if err = updateExpiredTasks(expiredTaskIds); err != nil {
		return
	}

	// 终态成功，执行成功后操作
	if action.IsPassed() {
		if err = handleSuccess(action.TaskChain[len(action.TaskChain)-1].VideoModerationTask); err != nil {
			return
		}
	}

	logger.Info("action statuses : %v", statuses)

	return
}

func executeRollBack(lastValidTask *dbstruct.VideoModerationTask) (err error) {
	ctx := &gin.Context{}
	lastValidTask.Status = goproto.Int64(consts.VideoModeration_Rollbacked)
	if err = _DefaultResultHandler.Handle(ctx, lastValidTask, consts.VideoModerationTaskUpdate_Rollback); err != nil {
		logger.Error("Roll back taskId:%v fail:%v", lastValidTask.GetId(), err)
		if err = _DefaultVideoModerationTask.OpUpdate(ctx, &video_moderation_task_proto.OpUpdateReq{
			VideoModerationTask: &dbstruct.VideoModerationTask{
				Id:      lastValidTask.Id,
				Status:  goproto.Int64(consts.VideoModeration_Failed),
				Remarks: goproto.String("任务审核失败，回退失败，请联系管理员排查"),
			},
		}); err != nil {
			logger.Error("_DefaultVideoModeration OpUpdate fail: %v\n", err)
		}
		return
	}
	if err = _DefaultVideoModerationTask.OpUpdate(ctx, &video_moderation_task_proto.OpUpdateReq{
		VideoModerationTask: &dbstruct.VideoModerationTask{
			Id:      lastValidTask.Id,
			Status:  goproto.Int64(consts.VideoModeration_Rollbacked),
			Remarks: goproto.String("任务审核失败，已将字段回退至之前的版本"),
		},
	}); err != nil {
		logger.Error("_DefaultVideoModeration OpUpdate fail: %v\n", err)
	}
	return
}

func handleSuccess(task *dbstruct.VideoModerationTask) (err error) {
	ctx := &gin.Context{}
	task.Status = goproto.Int64(consts.VideoModeration_Passed)
	if err = _DefaultResultHandler.Handle(ctx, task, consts.VideoModerationTaskUpdate_Success); err != nil {
		logger.Error("Handle success taskId:%v fail:%v", task.GetId(), err)
		if err = _DefaultVideoModerationTask.OpUpdate(ctx, &video_moderation_task_proto.OpUpdateReq{
			VideoModerationTask: &dbstruct.VideoModerationTask{
				Id:      task.Id,
				Status:  goproto.Int64(consts.VideoModeration_Failed),
				Remarks: goproto.String("任务审核成功，执行成功后操作失败，请联系管理员排查"),
			},
		}); err != nil {
			logger.Error("_DefaultVideoModerationTask OpUpdate fail: %v\n", err)
		}
		return
	}
	return
}

func updatePassedTasks(passTaskIds []string) (err error) {
	ctx := &gin.Context{}
	if err = _DefaultVideoModerationTask.OpUpdateByIds(ctx, &video_moderation_task_proto.OpUpdateByIdsReq{
		VideoModerationTask: &dbstruct.VideoModerationTask{
			Status:  goproto.Int64(consts.VideoModeration_Passed),
			Remarks: goproto.String("任务审核通过"),
		},
		Ids: passTaskIds,
	}); err != nil {
		logger.Error("_DefaultVideoModeration OpUpdateByIds fail: %v\n", err)
		return
	}
	return
}

func updateExpiredTasks(expiredTaskIds []string) (err error) {
	ctx := &gin.Context{}
	if err = _DefaultVideoModerationTask.OpUpdateByIds(ctx, &video_moderation_task_proto.OpUpdateByIdsReq{
		VideoModerationTask: &dbstruct.VideoModerationTask{
			Status:  goproto.Int64(consts.VideoModeration_Expired),
			Remarks: goproto.String("该任务审核未通过，但之前已有对同字段的审核任务失败，或之后有对同字段的审核任务成功，该任务已失效"),
		},
		Ids: expiredTaskIds,
	}); err != nil {
		logger.Error("_DefaultVideoModeration OpUpdateByIds fail: %v\n", err)
		return
	}
	return
}