package textaudit

import (
	"service/api/consts"
	textauditproto "service/api/proto/textaudit/proto"
	textaudittaskproto "service/api/proto/textaudittask/proto"
	"service/bizcommon/util"
	"service/dbstruct"
	"service/library/logger"

	textaudit "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"
)

// 文字审核主逻辑
func executeTextAuditTasks(tasks []*TextAuditTaskControlBlock, batchId string) (err error) {

	if len(tasks) == 0 {
		return
	}

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

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

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

	// 3.处理应答
	err = handleScanTextResponse(_result, batchId, tasks, actionMap)

	return

}

func createScanTextRequest(tasks []*TextAuditTaskControlBlock, batchId string) (request *textaudit.ScanTextRequest, actionMap map[string]*TextAuditAction, err error) {

	ctx := &gin.Context{}

	actionMap = make(map[string]*TextAuditAction) // 动作Id号-action的map

	// 1.打包文字，转成ScanTextRequest
	reqTasks := make([]*textaudit.ScanTextRequestTasks, 0)
	for _, task := range tasks {

		// 写map
		if actionMap[task.ActionId] == nil { // 写入actionMap
			actionMap[task.ActionId] = NewTextAuditAction()
			// 将此前批次对该元素未成功，待处理的审核全部置为已失效
			if err := _DefaultTextAuditTask.OpHandleOverdue(ctx, task.TextAuditTask, batchId); err != nil {
				logger.Error("_DefaultTextAuditTask OpHandleOverdue fail :%v", err)
			}
		}
		actionMap[task.ActionId].Record(task)

		// 打包
		reqTasks = append(reqTasks, &textaudit.ScanTextRequestTasks{
			Content: task.TextAuditTask.AuditedText,
		})
	}

	scanLabels := make([]*textaudit.ScanTextRequestLabels, len(labels))
	for i := range scanLabels {
		scanLabels[i] = &textaudit.ScanTextRequestLabels{
			Label: goproto.String(labels[i]),
		}
	}

	request = &textaudit.ScanTextRequest{
		Labels: scanLabels,
		Tasks:  reqTasks,
	}
	logger.Info("本次打包:%v", reqTasks)
	return
}

func handleScanTextResponse(resp *textaudit.ScanTextResponse, batchId string, tasks []*TextAuditTaskControlBlock, actionMap map[string]*TextAuditAction) (err error) {
	results := resp.Body.Data.Elements
	for i, result := range results {
		isActionCompleted := false
		action := &TextAuditAction{}

		// 1.立即在textaudit-textaudit中更新该次审核结果
		pass, err := handleTextAudit(tasks[i].TextAuditTask.TextAuditId, result)
		if err != nil {
			logger.Error("handleTextAudit fail: %v", err)
		}

		// 2.更新任务状态
		tasks[i].IsTaskPassed = pass

		// 3.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
		isActionCompleted, action = handleTaskAction(tasks[i], actionMap)

		// 4.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 handleTextAudit(id *string, result *textaudit.ScanTextResponseBodyDataElements) (pass bool, err error) {
	ctx := &gin.Context{}
	textaudit := &dbstruct.TextAudit{
		Id: id,
	}
	pass, err = copyScanResultInfo(textaudit, result)
	if err != nil {
		logger.Error("Copy Scan Result Info fail: %v\n", err)
		return
	}
	if err = _DefaultTextAudit.OpUpdate(ctx, &textauditproto.OpUpdateReq{
		TextAudit: textaudit,
	}); err != nil {
		logger.Error("_DefaultTextAudit OpUpdate fail: %v\n", err)
		return
	}
	return
}

// 通过task的actionId查出action, 通知该task已完成
func handleTaskAction(task *TextAuditTaskControlBlock, actionMap map[string]*TextAuditAction) (isActionCompleted bool, action *TextAuditAction) {
	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 *TextAuditAction) (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.TextAudit_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.TextAudit_Expired
				expiredTaskIds = append(expiredTaskIds, util.DerefString(task.TextAuditTask.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.TextAuditTask.Id))
			statuses[i] = consts.TextAudit_Passed
			isActionInPassedStatus = true
			if statuses[lastValidTaskIndex] == consts.TextAudit_Rollbacked {
				statuses[lastValidTaskIndex] = consts.TextAudit_Expired
				expiredTaskIds = append(expiredTaskIds, util.DerefString(action.TaskChain[lastValidTaskIndex].TextAuditTask.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
}

// 将文字审核结果copy到文字审核实体中
func copyScanResultInfo(textaudit *dbstruct.TextAudit, elements *textaudit.ScanTextResponseBodyDataElements) (pass bool, err error) {

	pass = true
	for _, result := range elements.Results {
		textaudit.Suggestion = result.Suggestion
		textaudit.Label = result.Label
		textaudit.Rate = goproto.Float64(float64(util.DerefFloat32(result.Rate)))
		if util.DerefString(textaudit.Label) == LabelPassed {
			textaudit.Status = goproto.Int64(consts.TextAudit_Passed)
		} else {
			pass = false
			textaudit.Status = goproto.Int64(consts.TextAudit_Rejected)
			for _, detail := range result.Details {
				label := TextAuditLabel(util.DerefString(detail.Label))
				contexts := parseDetailsContexts(detail.Contexts)
				switch label {
				case Spam:
					textaudit.SpamLabelDetails = &contexts
				case Politics:
					textaudit.PoliticsLabelDetails = &contexts
				case Abuse:
					textaudit.AbuseLabelDetails = &contexts
				case Terrorism:
					textaudit.TerrorismLabelDetails = &contexts
				case Porn:
					textaudit.PornLabelDetails = &contexts
				case Flood:
					textaudit.FloodLabelDetails = &contexts
				case Contraband:
					textaudit.ContrabandLabelDetails = &contexts
				case Ad:
					textaudit.AdLabelDetails = &contexts
				}
			}
		}
	}
	return
}

func parseDetailsContexts(contexts []*textaudit.ScanTextResponseBodyDataElementsResultsDetailsContexts) []string {
	ctxs := make([]string, len(contexts))
	for i, context := range contexts {
		ctxs[i] = util.DerefString(context.Context)
	}
	return ctxs
}

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

func updatePassedTasks(passTaskIds []string) (err error) {
	ctx := &gin.Context{}
	if err = _DefaultTextAuditTask.OpUpdateByIds(ctx, &textaudittaskproto.OpUpdateByIdsReq{
		TextAuditTask: &dbstruct.TextAuditTask{
			Status: goproto.Int64(consts.TextAudit_Passed),
		},
		Ids: passTaskIds,
	}); err != nil {
		logger.Error("_DefaultTextAuditTask OpUpdateByIds fail: %v\n", err)
		return
	}
	return
}

func updateExpiredTasks(expiredTaskIds []string) (err error) {
	ctx := &gin.Context{}
	if err = _DefaultTextAuditTask.OpUpdateByIds(ctx, &textaudittaskproto.OpUpdateByIdsReq{
		TextAuditTask: &dbstruct.TextAuditTask{
			Status: goproto.Int64(consts.TextAudit_Expired),
		},
		Ids: expiredTaskIds,
	}); err != nil {
		logger.Error("_DefaultTextAuditTask OpUpdateByIds fail: %v\n", err)
		return
	}

	return
}

func handleBatchError(tasks []*TextAuditTaskControlBlock, batchId string, _err error) (err error) {
	logger.Info("All tasks of this batchId: %v has failed, rolling back...", batchId)
	ctx := &gin.Context{}
	if err = _DefaultTextAudit.OpUpdateByBatchId(ctx, batchId, &dbstruct.TextAudit{
		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("_DefaultTextAudit OpUpdateByBatchId fail: %v\n", err)
		return
	}

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

	// 回退
	for _, task := range tasks {
		if err = task.RollbackFunc(); err != nil {
			if err = _DefaultTextAuditTask.OpUpdate(ctx, &textaudittaskproto.OpUpdateReq{
				TextAuditTask: &dbstruct.TextAuditTask{
					Id:      task.TextAuditTask.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("_DefaultTextAudit OpUpdate fail: %v\n", err)
			}
		}
	}
	return
}