package task

import (
	"context"
	"errors"
	"fmt"
	"model-gateway/common/util"
	"model-gateway/service/queue"
	"time"

	"model-gateway/dao"
	"model-gateway/model/dto"
	"model-gateway/model/entity"

	"gitea.com/red-future/common/beans"
	"gitea.com/red-future/common/utils"
	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gtime"
	"github.com/gogf/gf/v2/util/gconv"
	"github.com/google/uuid"
)

var Task = &taskService{}

type taskService struct{}

// Create 创建任务
func (s *taskService) Create(ctx context.Context, req *dto.CreateTaskReq) (res *dto.CreateTaskRes, err error) {
	startAt := time.Now()
	taskID := uuid.NewString()
	// 1) 检查模型配置，并且获取模型
	userInfo, err := utils.GetUserInfo(ctx)
	if err != nil {
		return nil, err
	}
	model, err := dao.Model.Get(ctx, &entity.AsynchModel{
		SQLBaseDO: beans.SQLBaseDO{
			TenantId: userInfo.TenantId,
			Creator:  userInfo.UserName,
		},
		ModelName: req.ModelName,
	})
	if err != nil {
		return nil, err
	}
	if model == nil || (model.Enabled != nil && *model.Enabled != 1) {
		return nil, errors.New("模型不存在或未启用")
	}

	// 2) 排队上限（严格控制：Redis 原子闸门）
	limit := queue.GetRuntimeQueueLimit(ctx, req.ModelName, model.MaxConcurrency*2)
	if limit > 0 {
		ok, err := queue.AcquireQueueSlot(ctx, req.ModelName, taskID, limit, model.TimeoutSeconds)
		if err != nil {
			return nil, err
		}
		if !ok {
			return nil, errors.New("任务排队已满，请稍后再试")
		}
	}

	// 3) 插入任务记录
	if model.IsAsync != nil && *model.IsAsync == 1 {
		// 异步调用：注入回调地址后提交，拿到 task_id 轮询
		req.RequestPayload = util.InjectCallbackURL(ctx, req.RequestPayload, model.CallbackUrl)
	}
	storedPayload := map[string]any{
		"headers": util.ParseHeadMsgHeaders(model.HeadMsg),
		"body":    req.RequestPayload,
	}
	_, err = dao.Task.Insert(ctx, &entity.AsynchTask{
		ModelName:      req.ModelName,
		TaskID:         taskID,
		State:          0,
		BizName:        req.BizName,
		CallbackURL:    req.CallbackUrl,
		ModelKey:       model.ApiKey,
		InputRef:       req.InputRef,
		RequestPayload: storedPayload,
		EpicycleId:     req.EpicycleId,
	})
	if err != nil { // 入库失败：回滚闸门占位
		queue.ReleaseQueueSlot(ctx, req.ModelName, taskID)
		return nil, err
	}

	// 4) 写操作日志（不影响主流程，失败忽略）
	ip := ""
	ua := ""
	apiPath := "/task/createTask"
	httpMethod := "POST"
	if r := g.RequestFromCtx(ctx); r != nil {
		ip = util.GetLocalIP()
		ua = r.UserAgent()
		apiPath = r.URL.Path
		httpMethod = r.Method
	}
	_, _ = dao.OpLog.Insert(ctx, &entity.LogsModelOp{
		IP:             ip,
		UserAgent:      ua,
		APIPath:        apiPath,
		HttpMethod:     httpMethod,
		BizName:        req.BizName,
		ModelName:      req.ModelName,
		TaskID:         taskID,
		OpType:         "createTask",
		Success:        1,
		ErrorMsg:       "",
		CostMs:         time.Since(startAt).Milliseconds(),
		RequestPayload: storedPayload,
		ResponsePayload: gdb.Map{
			"taskId": taskID,
		},
	})

	// 5) 获取任务信息
	task, err := dao.Task.ClaimPendingByTaskIDGlobal(ctx, taskID)
	if err != nil {
		return nil, err
	}
	if task == nil {
		return nil, err
	}

	// 5) 创建成功后立即异步尝试执行当前任务
	go AsyncWorker.handleOne(util.AsyncCtx(ctx), task, model, req)

	return &dto.CreateTaskRes{TaskID: taskID}, nil
}

func (s *taskService) ModelTaskCallback(ctx context.Context, req *dto.ModelTaskCallbackReq) (*dto.ModelTaskCallbackRes, error) {
	g.Log().Infof(ctx, "[模型回调] 收到通知 taskID=%s status=%s", req.TaskID, req.Status)
	// 1. 查本地任务
	task, err := dao.Task.Get(ctx, &entity.AsynchTask{
		TaskID: req.TaskID,
	})
	if err != nil || task == nil {
		return nil, fmt.Errorf("任务不存在: %s", req.TaskID)
	}

	// 2. 成功：取 video_url 和 usage
	if req.Status == "succeeded" {
		result := map[string]any{
			"video_url": req.Content["video_url"],
			"usage":     req.Usage,
		}
		NotifyAsyncResult(req.TaskID, result, nil)
		return &dto.ModelTaskCallbackRes{Success: true}, nil
	}

	// 3. 失败/过期
	if req.Status == "failed" || req.Status == "expired" {
		NotifyAsyncResult(req.TaskID, nil, fmt.Errorf(req.Status))
		return &dto.ModelTaskCallbackRes{Success: true}, nil
	}

	return &dto.ModelTaskCallbackRes{Success: true}, nil
}

// QueryPendingTasks 批量轮询进行中的异步任务
func (s *taskService) QueryPendingTasks(ctx context.Context, req *dto.QueryPendingTasksReq) (*dto.QueryPendingTasksRes, error) {
	limit := req.Limit
	if limit <= 0 {
		limit = g.Cfg().MustGet(ctx, "asynch.queryPending.limit", 10).Int()
	}

	// 1. 查 state=1（执行中）的异步任务
	tasks, err := dao.Task.GetPendingAsyncTasks(ctx, limit)
	if err != nil {
		return nil, err
	}

	// 2. 逐个查询
	var results []dto.QueryTaskItem
	for _, t := range tasks {
		// 拿到模型配置
		model, err := dao.Model.GetByModelNameForTenant(ctx, t.TenantId, t.ModelName)
		if err != nil || model == nil || model.QueryConfig == nil {
			continue
		}
		result, err := util.PullTaskResult(ctx, t.TaskID, model.QueryConfig)
		if err != nil {
			g.Log().Warningf(ctx, "[轮询] 查询失败 taskID=%s err=%v", t.TaskID, err)
			continue
		}

		status := gconv.String(result["status"])
		item := dto.QueryTaskItem{
			TaskID:  t.TaskID,
			Status:  status,
			Content: result["content"].(map[string]any),
			Usage:   result["usage"].(map[string]any),
		}
		results = append(results, item)

		// 如果任务完成，通知等待通道
		if status == "succeeded" || status == "failed" || status == "expired" {
			NotifyAsyncResult(t.TaskID, result["content"].(map[string]any), nil)
		}
	}

	return &dto.QueryPendingTasksRes{
		Total:   len(results),
		Results: results,
	}, nil
}

// GetResult 获取任务结果
func (s *taskService) GetResult(ctx context.Context, taskID string) (res *dto.GetTaskResultRes, err error) {
	t, err := dao.Task.Get(ctx, &entity.AsynchTask{
		TaskID: taskID,
	})
	if err != nil {
		return nil, err
	}
	if t == nil {
		return nil, errors.New("任务不存在")
	}
	return &dto.GetTaskResultRes{
		OssFile: t.OssFile,
		State:   t.State,
	}, nil
}

// GetBatch 批量查询任务；将成功(state=2)的任务更新为已下载(state=4)，并写入过期时间
func (s *taskService) GetBatch(ctx context.Context, req *dto.GetTaskBatchReq) (res *dto.GetTaskBatchRes, err error) {
	if req == nil || len(req.TaskIDs) == 0 {
		return &dto.GetTaskBatchRes{List: []dto.GetTaskBatchItem{}}, nil
	}
	// 1) 先查当前租户下的任务列表
	list, err := dao.Task.ListByTaskIDs(ctx, req.TaskIDs)
	if err != nil {
		return nil, err
	}

	// 2) 对成功(state=2)的任务：标记为已下载(state=4)并写入 expire_at
	now := time.Now()
	for _, t := range list {
		if t == nil {
			continue
		}
		if t.State != 2 {
			continue
		}
		// 按模型配置决定保留时间
		m, err := dao.Model.Get(ctx, &entity.AsynchModel{
			ModelName: t.ModelName,
		})
		if err != nil {
			return nil, err
		}
		retainSeconds := 86400
		if m != nil && m.AutoCleanSeconds > 0 {
			retainSeconds = m.AutoCleanSeconds
		}
		expireAt := gtime.New(now.Add(time.Duration(retainSeconds) * time.Second))
		_ = dao.Task.MarkDownloadedByID(ctx, t.Id, expireAt)

		// 为了本次返回一致性，内存里也更新
		t.State = 4
		t.ExpireAt = expireAt
	}

	// 3) 组装返回
	items := make([]dto.GetTaskBatchItem, 0, len(list))
	for _, t := range list {
		if t == nil {
			continue
		}
		items = append(items, dto.GetTaskBatchItem{
			TaskID:  t.TaskID,
			State:   t.State,
			OssFile: t.OssFile,
		})
	}
	return &dto.GetTaskBatchRes{List: items}, nil
}

// List 获取任务列表
func (s *taskService) List(ctx context.Context, req *dto.ListTaskReq) (res *dto.ListTaskRes, err error) {
	pageNum, pageSize := 1, 10
	if req != nil {
		if req.PageNum > 0 {
			pageNum = req.PageNum
		}
		if req.PageSize > 0 {
			pageSize = req.PageSize
		}
	}
	modelName := ""
	taskID := ""
	var state *int
	if req != nil {
		modelName = req.ModelName
		taskID = req.TaskID
		state = req.State
	}
	list, total, err := dao.Task.List(ctx, pageNum, pageSize, modelName, taskID, state)
	if err != nil {
		return nil, err
	}
	return &dto.ListTaskRes{List: list, Total: total}, nil
}