package imageaudit

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

	"github.com/gin-gonic/gin"
	goproto "google.golang.org/protobuf/proto"
)

// 图像审核任务控制块
// ActionId设计初衷：由于图像审核是定时任务触发的批量作业，如果在一次作业间隔有针对同一个图像媒体的多次更新，则会提交关于它的多次审核，需要配合乐观锁保证数据一致性
type ImageAuditTaskControlBlock struct {
	// 静态元素
	ActionId       string                   // 审核动作id号，由图像审核实体数据库四要素拼接而成，用于指示对数据库-表-单条数据-图像字段的审核动作
	ImageAuditTask *dbstruct.ImageAuditTask // 审核任务
	RollbackFunc   func() error             // 审核失败时的回退方法

	// 操作对象
	Images []*dbstruct.MediaComponent // 被审核的图像序列

	// 动态元素
	IsTaskPassed          bool // 任务状态，仅当任务已确定完成，即已完成审核任务的分片数 = 审核任务分片数时，才有意义
	AuditedFragmentsNum   int  // 已完成审核任务的分片数
	IsGivingNoticeToBatch bool // 是否进行批处理
}

// 新建图像审核任务块
func NewImageAuditTaskControlBlock(task *dbstruct.ImageAuditTask, rollbackFunc func() error) (tcb *ImageAuditTaskControlBlock) {
	if task == nil || task.AuditedMedia == nil {
		return
	}
	fragmentNum := len(util.DerefInt64Slice(task.AuditedMedia.ImageIds))
	if fragmentNum == 0 {
		return
	}

	task.BatchId = goproto.String(defaultImageAuditTaskScheduler.batchId)
	task.Status = goproto.Int64(consts.ImageAudit_Created)
	if fragmentNum == 1 {
		task.IsFragmented = goproto.Int64(0)
		task.FragmentsNum = goproto.Int64(1)
	} else {
		task.IsFragmented = goproto.Int64(1)
		task.FragmentsNum = goproto.Int64(int64(fragmentNum))
	}

	tcb = &ImageAuditTaskControlBlock{
		ActionId: fmt.Sprintf("%v%v%v%v", util.DerefString(task.AssociativeDatabase), util.DerefString(task.AssociativeTableName),
			util.DerefInt64(task.AssociativeTableId), util.DerefString(task.AssociativeTableColumn)),
		ImageAuditTask:        task,
		RollbackFunc:          rollbackFunc,
		IsTaskPassed:          true,
		AuditedFragmentsNum:   0,
		IsGivingNoticeToBatch: false,
	}
	return
}

func AddTask(task *ImageAuditTaskControlBlock) {
	if err := task.Prepare(); err != nil {
		logger.Error("ImageAuditTaskPrepareException: %v", err)
		return
	}
	defaultImageAuditTaskScheduler.AddTask(task)
}

// 将图像审核任务信息写入数据库，准备送审
func (task *ImageAuditTaskControlBlock) Prepare() (err error) {

	if task == nil {
		return fmt.Errorf("task is nil, check your input")
	}

	// 1.写入图像审核表
	if util.DerefInt64(task.ImageAuditTask.IsFragmented) == 1 {
		if task.Images, err = prepareFragmentedImageAuditTask(task.ImageAuditTask); err != nil {
			return err
		}
	} else {
		if err := prepareNotFragmentedImageAuditTask(task.ImageAuditTask); err != nil {
			return err
		}
		task.Images = make([]*dbstruct.MediaComponent, 1)
		task.Images[0] = task.ImageAuditTask.AuditedMedia
	}

	// 2.写入图像审核任务表
	if err := _DefaultImageAuditTask.OpCreate(&gin.Context{}, &imageaudittaskproto.OpCreateReq{
		ImageAuditTask: task.ImageAuditTask,
	}); err != nil {
		logger.Error("Imageaudittask OpCreate failed: %v", err)
		return err
	}

	return nil
}

// 根据任务信息，创建单个图片的图片审核，并存入数据库，返回images
func prepareFragmentedImageAuditTask(task *dbstruct.ImageAuditTask) (images []*dbstruct.MediaComponent, err error) {
	ctx := &gin.Context{}

	fragmentsNum := util.DerefInt64(task.FragmentsNum)
	images = make([]*dbstruct.MediaComponent, fragmentsNum)
	imageAudits := make([]*dbstruct.ImageAudit, fragmentsNum)

	// 将媒体拆分为单个图像并存入图片审核表
	imageIds := util.DerefInt64Slice(task.AuditedMedia.ImageIds)
	for i, imageId := range imageIds {
		images[i] = &dbstruct.MediaComponent{
			ImageIds: util.Int64Slice([]int64{imageId}),
		}
		imageAudits[i] = &dbstruct.ImageAudit{
			AuditedMedia: images[i],
			BatchId:      task.BatchId,
			Status:       goproto.Int64(consts.ImageAudit_Created),
		}
	}
	if err = _DefaultImageAudit.OpCreateFragmentGroup(ctx, &imageauditproto.OpCreateBatchReq{
		ImageAudits:  imageAudits,
		FragmentsNum: fragmentsNum,
	}); err != nil {
		logger.Error("Imageaudit OpCreateFragmentGroup failed: %v", err)
		return
	}

	auditFragmentIds := make([]string, fragmentsNum)
	for i, imageaudit := range imageAudits {
		auditFragmentIds[i] = util.DerefString(imageaudit.Id)
	}
	task.ImageAuditFragmentIds = &auditFragmentIds
	return
}

func prepareNotFragmentedImageAuditTask(task *dbstruct.ImageAuditTask) (err error) {
	ctx := &gin.Context{}

	imageAudit := &dbstruct.ImageAudit{
		AuditedMedia: task.AuditedMedia,
		BatchId:      task.BatchId,
		Status:       goproto.Int64(consts.ImageAudit_Created),
	}
	if err = _DefaultImageAudit.OpCreate(ctx, &imageauditproto.OpCreateReq{
		ImageAudit: imageAudit,
	}); err != nil {
		logger.Error("Imageaudit OpCreate failed: %v", err)
		return
	}

	task.ImageAuditId = imageAudit.Id
	return
}