/*
Copyright 2025 linux.do

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package task

import (
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/hibiken/asynq"
	"github.com/linux-do/credit/internal/task"
	"github.com/linux-do/credit/internal/task/scheduler"
	"github.com/linux-do/credit/internal/util"
)

// ListTaskTypes 获取支持的任务类型列表
// @Tags admin
// @Produce json
// @Success 200 {object} util.ResponseAny
// @Router /api/v1/admin/tasks/types [get]
func ListTaskTypes(c *gin.Context) {
	c.JSON(http.StatusOK, util.OK(task.DispatchableTasks))
}

// DispatchTaskRequest 下发任务请求
type DispatchTaskRequest struct {
	TaskType  string     `json:"task_type" binding:"required"`
	StartTime *time.Time `json:"start_time"`
	EndTime   *time.Time `json:"end_time"`
	UserID    *uint64    `json:"user_id"`
}

// DispatchTask 下发任务
// @Tags admin
// @Accept json
// @Produce json
// @Param request body DispatchTaskRequest true "request body"
// @Success 200 {object} util.ResponseAny
// @Router /api/v1/admin/tasks/dispatch [post]
func DispatchTask(c *gin.Context) {
	var req DispatchTaskRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, util.Err(err.Error()))
		return
	}

	meta := task.GetTaskMeta(req.TaskType)
	if meta == nil {
		c.JSON(http.StatusBadRequest, util.Err(InvalidTaskType))
		return
	}

	var taskInfo *asynq.Task
	var taskID string

	switch req.TaskType {
	case task.TaskTypeOrderSync:
		if req.StartTime != nil && req.EndTime != nil {
			if req.EndTime.Before(*req.StartTime) {
				c.JSON(http.StatusBadRequest, util.Err(InvalidTimeRange))
				return
			}
			payload, _ := json.Marshal(map[string]interface{}{
				"start_time": req.StartTime,
				"end_time":   req.EndTime,
			})
			taskInfo = asynq.NewTask(meta.AsynqTask, payload)
			taskID = fmt.Sprintf("manual_%s_%s_%s", req.TaskType,
				req.StartTime.Format("20060102150405"),
				req.EndTime.Format("20060102150405"))
		} else {
			taskInfo = asynq.NewTask(meta.AsynqTask, nil)
			taskID = fmt.Sprintf("manual_%s", req.TaskType)
		}

	case task.TaskTypeUserGamification:
		if req.UserID == nil || *req.UserID == 0 {
			taskInfo = asynq.NewTask(task.UpdateUserGamificationScoresTask, nil)
			taskID = fmt.Sprintf("manual_%s", req.TaskType)
		} else {
			payload, _ := json.Marshal(map[string]interface{}{
				"user_id": *req.UserID,
			})
			taskInfo = asynq.NewTask(meta.AsynqTask, payload)
			taskID = fmt.Sprintf("manual_%s_user_%d", req.TaskType, *req.UserID)
		}
	default:
		taskInfo = asynq.NewTask(meta.AsynqTask, nil)
		taskID = fmt.Sprintf("manual_%s", req.TaskType)
	}

	_, err := scheduler.AsynqClient.Enqueue(
		taskInfo,
		asynq.TaskID(taskID),
		asynq.MaxRetry(meta.MaxRetry),
		asynq.Queue(meta.Queue),
	)
	if err != nil {
		c.JSON(http.StatusInternalServerError, util.Err(fmt.Sprintf("%s: %v", TaskDispatchFailed, err)))
		return
	}

	c.JSON(http.StatusOK, util.OKNil())
}