package service

import (
	"context"
	"time"

	"model-asynch/dao"

	"github.com/gogf/gf/v2/frame/g"
)

var Cleaner = &cleaner{}

type cleaner struct{}

func (c *cleaner) Start(ctx context.Context) {
	if !g.Cfg().MustGet(ctx, "asynch.cleaner.enabled", true).Bool() {
		g.Log().Warningf(ctx, "[cleaner] asynch.cleaner.enabled=false，cleaner 未启动")
		return
	}
	intervalStr := g.Cfg().MustGet(ctx, "asynch.cleaner.interval", "10m").String()
	interval, _ := time.ParseDuration(intervalStr)
	if interval <= 0 {
		interval = 10 * time.Minute
	}
	go func() {
		ticker := time.NewTicker(interval)
		defer ticker.Stop()
		g.Log().Infof(ctx, "[cleaner] started, interval=%s", interval)
		for {
			select {
			case <-ctx.Done():
				return
			case <-ticker.C:
				c.runOnce(ctx)
			}
		}
	}()
}

func (c *cleaner) runOnce(ctx context.Context) {
	// 1) 清理已下载(state=4)且过期的任务（硬删除 + OSS）
	expired, err := dao.Task.ListExpiredDownloadedGlobal(ctx, 200)
	if err != nil {
		g.Log().Errorf(ctx, "[cleaner] list expired(downloaded) error: %v", err)
	} else {
		for _, t := range expired {
			deleteTmpResult(t.TmpFile)
			_ = dao.Task.HardDeleteByIDGlobal(ctx, t.Id)
		}
		g.Log().Infof(ctx, "[cleaner] expired(downloaded) cleaned, count=%d", len(expired))
	}

	// 2) 超时任务标失败
	timeoutStr := g.Cfg().MustGet(ctx, "asynch.worker.taskTimeout", "30m").String()
	timeout, _ := time.ParseDuration(timeoutStr)
	if timeout > 0 {
		list, err := dao.Task.ListTimeoutTasksGlobal(ctx, timeout, 200)
		if err != nil {
			g.Log().Errorf(ctx, "[cleaner] list timeout error: %v", err)
		} else {
			for _, t := range list {
				_ = dao.Task.UpdateFailedGlobal(ctx, t.Id, "任务超时自动失败")
			}
			g.Log().Infof(ctx, "[cleaner] timeout cleaned, count=%d", len(list))
		}
	}

	// 3) 失败(state=3)的任务按模型配置 retry_times 重新入队（放到队尾）
	retryable, err := dao.Task.ListFailedRetryableGlobal(ctx, 200)
	if err != nil {
		g.Log().Errorf(ctx, "[cleaner] list failed retryable error: %v", err)
	} else {
		for _, t := range retryable {
			// retry_queue_max_seconds 控制失败重试的排队策略：
			// - =0：失败重试插队到队首
			// - >0：当任务从创建到现在的排队时长 >= maxSeconds，则插队到队首；否则仍放到队尾
			now := time.Now()
			enqueueAt := now
			maxSeconds := t.RetryQueueMaxSeconds
			if maxSeconds == 0 {
				enqueueAt = now.Add(-100 * 365 * 24 * time.Hour)
			} else if maxSeconds > 0 && t.CreatedAt != nil {
				if now.Sub(t.CreatedAt.Time) >= time.Duration(maxSeconds)*time.Second {
					enqueueAt = now.Add(-100 * 365 * 24 * time.Hour)
				}
			}
			_ = dao.Task.RequeueForRetryGlobal(ctx, t.Id, enqueueAt)
		}
		g.Log().Infof(ctx, "[cleaner] failed retryable cleaned, count=%d", len(retryable))
	}

	// 4) 超过重试次数仍失败(state=3)的任务：硬删除
	exhausted, err := dao.Task.ListFailedExhaustedGlobal(ctx, 200)
	if err != nil {
		g.Log().Errorf(ctx, "[cleaner] list failed exhausted error: %v", err)
	} else {
		for _, t := range exhausted {
			deleteTmpResult(t.TmpFile)
			_ = dao.Task.HardDeleteByIDGlobal(ctx, t.Id)
		}
		g.Log().Infof(ctx, "[cleaner] failed exhausted cleaned, count=%d", len(exhausted))
	}
}