package imageaudit

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

	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"
)

// 刷新批次号
func RefreshBatchId() string {
	batchId := defaultImageAuditTaskScheduler.batchId
	defaultImageAuditTaskScheduler.batchId = genereteBatchId()
	return batchId
}

// 图像审核主逻辑
func Run(batchId string) (successNum int, failNum int, err error) {

	// 查询该批次所有审核任务
	imageaudittasks, err := _DefaultImageAuditTask.OpList(&gin.Context{}, &imageaudittaskproto.OpListReq{
		BatchId: goproto.String(batchId),
		Status:  goproto.Int64(consts.ImageAudit_Created),
		Sort:    "ct",
	})
	if err != nil {
		logger.Info("_DefaultImageAuditTask OpList fail: %v", err)
	}

	if len(imageaudittasks) == 0 {
		return 0, 0, nil
	}

	// 上锁
	defaultImageAuditTaskScheduler.lock()

	logger.Info("Image audit batch started, batchId : %v, task number : %v", batchId, len(imageaudittasks))
	// 1.构建批量任务控制块，初始化必要的actionMap、填充送审image等信息
	ctrlBlock := NewImageAuditTaskBatchControlBlock(imageaudittasks, batchId)

	// 2.创建请求
	// oss不在上海的服务器，需要调用Advance接口
	req, err := createScanImageAdvanceRequest(ctrlBlock)
	if err != nil {
		logger.Info("Create Scan ImageRequest fail: %v", err)
		handleBatchError(ctrlBlock, err)
		failNum = len(imageaudittasks)
		return
	}

	// 3.调用阿里的服务,收到应答
	runtime := &teautils.RuntimeOptions{
		ConnectTimeout: tea.Int(30000),
	}
	_result, err := defaultImageAuditClient.ScanImageAdvance(req, runtime)
	if err != nil {
		if _t, ok := err.(*tea.SDKError); ok {
			logger.Error("ScanImageAdvance fail, errinfo : %v", util.DerefString(_t.Data))
		}
		handleBatchError(ctrlBlock, err)
		failNum = len(imageaudittasks)
		return
	}

	// 4.处理应答
	err = handleScanImageResponse(ctrlBlock, _result)

	// 解锁
	defaultImageAuditTaskScheduler.unLock()
	successNum = len(imageaudittasks)
	return
}

func createScanImageAdvanceRequest(ctrlBlock *ImageAuditTaskBatchControlBlock) (request *imageaudit.ScanImageAdvanceRequest, err error) {
	httpClient := http.Client{}
	imageauditIds := ctrlBlock.ImageAuditIds
	reqTasks := make([]*imageaudit.ScanImageAdvanceRequestTask, 0)
	reqs := make([]*imageaudit.ScanImageRequestTask, 0)
	for i, image := range ctrlBlock.Images {
		var file *http.Response
		file, err = httpClient.Get(image.Images[0].Urls[0])
		if err != nil {
			logger.Error("httpClient Get fail : %v", err)
			return
		}

		reqTasks = append(reqTasks, &imageaudit.ScanImageAdvanceRequestTask{
			DataId:         goproto.String(imageauditIds[i]),
			ImageURLObject: file.Body,
		})
		reqs = append(reqs, &imageaudit.ScanImageRequestTask{
			DataId:   goproto.String(imageauditIds[i]),
			ImageURL: goproto.String(image.Images[0].Urls[0]),
		})
	}

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

func handleScanImageResponse(ctrlBlock *ImageAuditTaskBatchControlBlock, resp *imageaudit.ScanImageResponse) (err error) {
	results := resp.Body.Data.Results
	taskCtrlBlocks := ctrlBlock.TaskCtrlBlocks
	img2taskIndexMap := ctrlBlock.Img2taskIndexMap
	actionMap := ctrlBlock.ActionMap
	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.取出task
		taskIndex := img2taskIndexMap[i]
		task := taskCtrlBlocks[taskIndex]

		// 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, 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.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.ImageAuditTask); 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 *dbstruct.ImageAuditTask) (err error) {
	ctx := &gin.Context{}
	if err = _DefaultResultHandler.Handle(ctx, lastValidTask, consts.ImageAuditTaskUpdate_Rollback); err != nil {
		logger.Error("Roll back taskId:%v fail:%v", util.DerefString(lastValidTask.Id), err)
		if err = _DefaultImageAuditTask.OpUpdate(ctx, &imageaudittaskproto.OpUpdateReq{
			ImageAuditTask: &dbstruct.ImageAuditTask{
				Id:      lastValidTask.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.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
}

func handleBatchError(ctrlBlock *ImageAuditTaskBatchControlBlock, _err error) (err error) {
	logger.Info("All tasks of this batchId: %v has failed, rolling back...", ctrlBlock.BatchId)
	ctx := &gin.Context{}
	if err = _DefaultImageAudit.OpUpdateByBatchId(ctx, ctrlBlock.BatchId, &dbstruct.ImageAudit{
		Status:  goproto.Int64(consts.ImageAudit_ServiceFailed),
		Remarks: goproto.String("批次任务失败，原因详见task表"),
	}); err != nil {
		logger.Error("_DefaultImageAudit OpUpdateByBatchId fail: %v\n", err)
		return
	}

	if err = _DefaultImageAuditTask.OpUpdateByBatchId(ctx, ctrlBlock.BatchId, &dbstruct.ImageAuditTask{
		Status:  goproto.Int64(consts.ImageAudit_ServiceFailed),
		Remarks: goproto.String(_err.Error()),
	}); err != nil {
		logger.Error("_DefaultImageAuditTask OpUpdateByBatchId fail: %v\n", err)
		return
	}

	// 回退
	for _, taskCtrlBlock := range ctrlBlock.TaskCtrlBlocks {
		task := taskCtrlBlock.ImageAuditTask
		if err = _DefaultResultHandler.Handle(ctx, task, consts.ImageAuditTaskUpdate_Rollback); err != nil {
			if err = _DefaultImageAuditTask.OpUpdate(ctx, &imageaudittaskproto.OpUpdateReq{
				ImageAuditTask: &dbstruct.ImageAuditTask{
					Id:      task.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
}