package sync

import (
	"context"
	"fmt"
	"time"

	dao "dataengine/dao/copydata"
	taskDto "dataengine/model/dto/copydata"

	"gitea.redpowerfuture.com/red-future/common/beans"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/sirupsen/logrus"
)

// StartCompensation 启动补偿调度器（在后台循环执行）
func StartCompensation(ctx context.Context) {
	sec := g.Cfg().MustGet(ctx, "sync.compensation_interval_seconds", 300).Int()
	if sec < 10 {
		sec = 300
	}
	interval := time.Duration(sec) * time.Second
	logrus.Infof("补偿调度器启动，间隔: %v", interval)

	ctx = context.WithValue(ctx, "user", &beans.User{UserName: "admin", TenantId: 1})

	runCompensation(ctx)
	ticker := time.NewTicker(interval)
	defer ticker.Stop()
	for {
		select {
		case <-ticker.C:
			runCompensation(ctx)
		case <-ctx.Done():
			logrus.Info("补偿调度器已停止")
			return
		}
	}
}

func runCompensation(ctx context.Context) {
	logrus.Info("=== 开始补偿扫描 ===")

	tasks, err := dao.SyncTaskLog.QueryFailedTasks(ctx, &taskDto.QueryFailedTasksReq{
		Status: []string{"failed"},
		Limit:  50,
	})
	if err != nil {
		logrus.Errorf("查询失败任务异常: %v", err)
		return
	}
	if len(tasks) == 0 {
		logrus.Info("当前没有需要补偿的任务")
		return
	}

	logrus.Infof("发现 %d 个失败任务", len(tasks))

	for _, task := range tasks {
		if task.RetryCount >= task.MaxRetry {
			logrus.Warnf("任务 %s 已达最大重试次数 %d", task.TaskID, task.MaxRetry)
			dao.SyncTaskLog.Update(ctx, &taskDto.UpdateSyncTaskLogReq{
				ID:           task.Id,
				Status:       "manual_review",
				ErrorMessage: fmt.Sprintf("已达最大重试次数 %d", task.MaxRetry),
			})
			continue
		}

		platformCode := task.PlatformCode
		interfaceCode := task.InterfaceCode
		if platformCode == "" || interfaceCode == "" {
			logrus.Warnf("任务 %s 缺少 platform_code 或 interface_code，跳过", task.TaskID)
			continue
		}

		logrus.Infof("补偿: %s/%s (第 %d 次)", platformCode, interfaceCode, task.RetryCount+1)

		retryCount := task.RetryCount + 1
		dao.SyncTaskLog.Update(ctx, &taskDto.UpdateSyncTaskLogReq{
			ID:         task.Id,
			Status:     "retrying",
			RetryCount: &retryCount,
		})

		_, err := SyncByConfig(ctx, platformCode, interfaceCode, false)
		if err != nil {
			logrus.Errorf("补偿失败: %v", err)
			backoff := []int{5, 15, 30, 60, 120}
			waitMin := 5
			if retryCount <= len(backoff) {
				waitMin = backoff[retryCount-1]
			} else {
				waitMin = backoff[len(backoff)-1]
			}
			nextRetry := time.Now().Add(time.Duration(waitMin) * time.Minute)
			dao.SyncTaskLog.Update(ctx, &taskDto.UpdateSyncTaskLogReq{
				ID:            task.Id,
				Status:        "failed",
				ErrorMessage:  err.Error(),
				ErrorCode:     "COMPENSATION_FAILED",
				NextRetryTime: nextRetry,
			})
		} else {
			logrus.Infof("补偿成功: %s/%s", platformCode, interfaceCode)
			now := time.Now()
			dao.SyncTaskLog.Update(ctx, &taskDto.UpdateSyncTaskLogReq{
				ID:          task.Id,
				Status:      "success",
				CompletedAt: now,
			})
		}
	}

	logrus.Info("=== 补偿扫描完成 ===")
}