package service

import (
	"context"
	"time"

	"model-asynch/dao"

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

var Cleaner = &cleaner{}

type cleaner struct{}

// RunOnce 由上层定时任务触发：执行一次清理/重试
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
	list, err := dao.Task.ListTimeoutTasksGlobal(ctx, 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")
			ReleaseQueueSlot(ctx, t.ModelName, t.TaskID)
		}
		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 {
			// 失败任务重新入队（state=3 -> 0）前，先严格占用 queue_limit slot；占用失败则留在失败态，下一轮再尝试
			// 获取模型配置以得到 queue_limit / expected_seconds
			m, err := dao.Model.GetByModelNameForTenant(ctx, t.TenantId, t.ModelName)
			if err != nil || m == nil {
				continue
			}
			limit := GetRuntimeQueueLimit(ctx, t.ModelName, m.QueueLimit)
			if limit > 0 {
				ok, _ := AcquireQueueSlot(ctx, t.ModelName, t.TaskID, limit, m.ExpectedSeconds)
				if !ok {
					continue
				}
			}
			// 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)
			// 重试耗尽硬删除：释放闸门占位（兜底，若此前已释放则幂等）
			ReleaseQueueSlot(ctx, t.ModelName, t.TaskID)
			_ = dao.Task.HardDeleteByIDGlobal(ctx, t.Id)
		}
		g.Log().Infof(ctx, "[cleaner] failed exhausted cleaned, count=%d", len(exhausted))
	}
}