package imageaudit

import (
	"encoding/json"
	"service/api/consts"
	imageauditproto "service/api/proto/imageaudit/proto"
	imageaudittaskproto "service/api/proto/imageaudittask/proto"
	"service/bizcommon/util"
	"service/dbstruct"
	"service/library/logger"
	"service/library/mediafiller"

	imageaudit "github.com/alibabacloud-go/imageaudit-20191230/v3/client"
	teautils "github.com/alibabacloud-go/tea-utils/v2/service"
	"github.com/alibabacloud-go/tea/tea"
	goproto "google.golang.org/protobuf/proto"

	"github.com/gin-gonic/gin"
)

// 图像审核主逻辑
func executeImageAuditTasks(tasks []*ImageAuditTaskControlBlock, batchId string) (err error) {

	if len(tasks) == 0 {
		return
	}

	logger.Info("Image audit batch started, batchId : %v, task number : %v\n", batchId, len(tasks))

	// 1.创建请求
	req, taskMap, actionMap, err := createScanImageRequest(tasks, batchId)
	if err != nil {
		logger.Info("Create Scan ImageRequest fail: %v", err)
		return
	}

	// 2.调用阿里的服务,收到应答
	runtime := &teautils.RuntimeOptions{
		ConnectTimeout: tea.Int(30000),
	}
	_result, err := defaultImageAuditClient.ScanImageWithOptions(req, runtime)
	if err != nil {
		logger.Error("ScanImageWithOptions fail : %v", err)
	}

	// 3.处理应答
	err = handleScanImageResponse(_result, batchId, taskMap, actionMap)

	return

}

func createScanImageRequest(tasks []*ImageAuditTaskControlBlock, batchId string) (request *imageaudit.ScanImageRequest,
	taskMap map[int]*ImageAuditTaskControlBlock, actionMap map[string]*ImageAuditAction, err error) {

	ctx := &gin.Context{}
	// todo:taskMap其实可以删掉
	taskMap = make(map[int]*ImageAuditTaskControlBlock) // 图像审核索引号-task的map
	actionMap = make(map[string]*ImageAuditAction)      // 动作Id号-action的map

	// 1.获取所有图像信息
	offset := 0
	images := make([]mediafiller.MediaFillable, 0)
	for _, task := range tasks {
		// 写map记录
		if actionMap[task.ActionId] == nil { // 写入actionMap
			actionMap[task.ActionId] = NewImageAuditAction()
		}
		actionMap[task.ActionId].Record(task)

		//获取图像
		for _, image := range task.Images {
			images = append(images, image)
			taskMap[offset] = task
			offset++
		}
	}
	mediafiller.FillList(ctx, images)

	// 2.打包图像url及图像审核id，转成ScanImageRequest
	reqTasks := make([]*imageaudit.ScanImageRequestTask, 0)
	for _, task := range tasks {
		if util.DerefInt64(task.ImageAuditTask.IsFragmented) == 1 {
			imageauditIds := util.DerefStringSlice(task.ImageAuditTask.ImageAuditFragmentIds)
			for i := range task.Images {
				reqTasks = append(reqTasks, &imageaudit.ScanImageRequestTask{
					DataId:   goproto.String(imageauditIds[i]),
					ImageURL: goproto.String(task.Images[i].Images[0].Urls[0]),
				})
			}
		} else {
			reqTasks = append(reqTasks, &imageaudit.ScanImageRequestTask{
				DataId:   task.ImageAuditTask.ImageAuditId,
				ImageURL: goproto.String(task.Images[0].Images[0].Urls[0]),
			})
		}

	}

	request = &imageaudit.ScanImageRequest{
		Scene: scenes,
		Task:  reqTasks,
	}
	logger.Info("本次打包:%v", reqTasks)
	return
}

func handleScanImageResponse(resp *imageaudit.ScanImageResponse, batchId string, taskMap map[int]*ImageAuditTaskControlBlock, actionMap map[string]*ImageAuditAction) (err error) {
	results := resp.Body.Data.Results
	for i, result := range results {
		isTaskCompleted := false
		isActionCompleted := false
		action := &ImageAuditAction{}

		// 1.dataId是imageaudit表主键Id, 唯一标识一次对单张图片的图像审核
		dataId := util.DerefString(result.DataId)

		// 2.立即在imageaudit-imageaudit中更新该次审核结果
		pass, err := handleImageAudit(dataId, result)
		if err != nil {
			logger.Error("handleImageAudit fail: %v", err)
		}

		// 3.取dataId前19位为taskId，反查得到那一次task
		task := taskMap[i]

		// 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)
		isTaskCompleted = handleTask(task, pass)

		// 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
		if isTaskCompleted {
			isActionCompleted, action = handleTaskAction(task, 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
		if isActionCompleted {
			if err = finalizeTask(action); err != nil {
				logger.Error("finalizeTask fail: %v", err)
			}
		}
	}
	return
}

func handleImageAudit(dataId string, result *imageaudit.ScanImageResponseBodyDataResults) (pass bool, err error) {
	ctx := &gin.Context{}
	imageaudit := &dbstruct.ImageAudit{
		Id: goproto.String(dataId),
	}
	pass, err = copyScanResultInfo(imageaudit, result)
	if err != nil {
		logger.Error("Copy Scan Result Info fail: %v\n", err)
		return
	}
	if err = _DefaultImageAudit.OpUpdate(ctx, &imageauditproto.OpUpdateReq{
		ImageAudit: imageaudit,
	}); err != nil {
		logger.Error("_DefaultImageAudit OpUpdate fail: %v\n", err)
		return
	}
	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 *ImageAuditTaskControlBlock, pass bool) (isTaskCompleted bool) {
	task.IsTaskPassed = task.IsTaskPassed && pass
	task.AuditedFragmentsNum++

	return task.AuditedFragmentsNum == int(util.DerefInt64(task.ImageAuditTask.FragmentsNum))
}

// 通过task的actionId查出action, 通知该task已完成
func handleTaskAction(task *ImageAuditTaskControlBlock, actionMap map[string]*ImageAuditAction) (isActionCompleted bool, action *ImageAuditAction) {
	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 *ImageAuditAction) (err error) {

	lastValidTask := action.TaskChain[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
	lastValidTaskIndex := 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，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 = task
				lastValidTaskIndex = i
				statuses[i] = consts.ImageAudit_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.ImageAudit_Expired
				expiredTaskIds = append(expiredTaskIds, util.DerefString(task.ImageAuditTask.Id))
			}
		} 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, util.DerefString(task.ImageAuditTask.Id))
			statuses[i] = consts.ImageAudit_Passed
			isActionInPassedStatus = true
			if statuses[lastValidTaskIndex] == consts.ImageAudit_Rollbacked {
				statuses[lastValidTaskIndex] = consts.ImageAudit_Expired
				expiredTaskIds = append(expiredTaskIds, util.DerefString(action.TaskChain[lastValidTaskIndex].ImageAuditTask.Id))
			}
		}
	}

	// 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); 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
	}

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

	return
}

// 将图片审核结果copy到图片审核实体中
func copyScanResultInfo(imageaudit *dbstruct.ImageAudit, result *imageaudit.ScanImageResponseBodyDataResults) (pass bool, err error) {

	pass = true
	for _, subresult := range result.SubResults {
		scene := ImageAuditScene(util.DerefString(subresult.Scene))
		switch scene {
		case Porn:
			imageaudit.PornSceneSuggestion = subresult.Suggestion
			imageaudit.PornSceneLabel = subresult.Label
			imageaudit.PornSceneRate = goproto.Float64(float64(util.DerefFloat32(subresult.Rate)))
			pass = pass && (util.StringsContains(PornPassLabels, util.DerefString(subresult.Label)))
		case Terrorism:
			imageaudit.TerrorismSceneSuggestion = subresult.Suggestion
			imageaudit.TerrorismSceneLabel = subresult.Label
			imageaudit.TerrorismSceneRate = goproto.Float64(float64(util.DerefFloat32(subresult.Rate)))
			pass = pass && (util.StringsContains(TerrorismPassLabels, util.DerefString(subresult.Label)))
		case Ad:
			imageaudit.AdSceneSuggestion = subresult.Suggestion
			imageaudit.AdSceneLabel = subresult.Label
			imageaudit.AdSceneRate = goproto.Float64(float64(util.DerefFloat32(subresult.Rate)))
			pass = pass && (util.StringsContains(AdPassLabels, util.DerefString(subresult.Label)))
		case Live:
			imageaudit.LiveSceneSuggestion = subresult.Suggestion
			imageaudit.LiveSceneLabel = subresult.Label
			imageaudit.LiveSceneRate = goproto.Float64(float64(util.DerefFloat32(subresult.Rate)))
			pass = pass && (util.StringsContains(LivePassLabels, util.DerefString(subresult.Label)))
		case Logo:
			imageaudit.LogoSceneSuggestion = subresult.Suggestion
			imageaudit.LogoSceneLabel = subresult.Label
			imageaudit.LogoSceneRate = goproto.Float64(float64(util.DerefFloat32(subresult.Rate)))
			pass = pass && (util.StringsContains(LogoPassLabels, util.DerefString(subresult.Label)))
		}

	}

	if pass {
		imageaudit.Status = goproto.Int64(consts.ImageAudit_Passed)
	} else {
		imageaudit.Status = goproto.Int64(consts.ImageAudit_Rejected)
		var bytes []byte
		bytes, err = json.Marshal(result)
		if err != nil {
			return
		}
		imageaudit.Details = &bytes
	}
	return
}

func executeRollBack(lastValidTask *ImageAuditTaskControlBlock) (err error) {
	ctx := &gin.Context{}
	if err = lastValidTask.RollbackFunc(); err != nil {
		logger.Error("Roll back taskId:%v fail:%v", util.DerefString(lastValidTask.ImageAuditTask.Id), err)
		if err = _DefaultImageAuditTask.OpUpdate(ctx, &imageaudittaskproto.OpUpdateReq{
			ImageAuditTask: &dbstruct.ImageAuditTask{
				Id:      lastValidTask.ImageAuditTask.Id,
				Status:  goproto.Int64(consts.ImageAudit_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("_DefaultImageAudit OpUpdate fail: %v\n", err)
		}
		return
	}
	if err = _DefaultImageAuditTask.OpUpdate(ctx, &imageaudittaskproto.OpUpdateReq{
		ImageAuditTask: &dbstruct.ImageAuditTask{
			Id:      lastValidTask.ImageAuditTask.Id,
			Status:  goproto.Int64(consts.ImageAudit_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("_DefaultImageAudit OpUpdate fail: %v\n", err)
	}
	return
}

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

func updateExpiredTasks(expiredTaskIds []string) (err error) {
	ctx := &gin.Context{}
	if err = _DefaultImageAuditTask.OpUpdateByIds(ctx, &imageaudittaskproto.OpUpdateByIdsReq{
		ImageAuditTask: &dbstruct.ImageAuditTask{
			Status:  goproto.Int64(consts.ImageAudit_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("_DefaultImageAudit OpUpdateByIds fail: %v\n", err)
		return
	}
	return
}