// Package handler provides HTTP handlers for various endpoints.
package handler

import (
	"net/http"

	"modelRT/database"
	"modelRT/logger"
	"modelRT/network"

	"github.com/gin-gonic/gin"
	"github.com/gofrs/uuid"
	"gorm.io/gorm"
)

// AsyncTaskResultDetailHandler handles detailed query of a single async task result
// @Summary 查询异步任务详情
// @Description 根据任务ID查询异步任务的详细状态和结果
// @Tags AsyncTask
// @Accept json
// @Produce json
// @Param task_id path string true "任务ID"
// @Success 200 {object} network.SuccessResponse{payload=network.AsyncTaskResult} "查询成功"
// @Failure 400 {object} network.FailureResponse "请求参数错误"
// @Failure 404 {object} network.FailureResponse "任务不存在"
// @Failure 500 {object} network.FailureResponse "服务器内部错误"
// @Router /task/async/{task_id} [get]
func AsyncTaskResultDetailHandler(c *gin.Context) {
	ctx := c.Request.Context()

	// Parse task ID from path parameter
	taskIDStr := c.Param("task_id")
	if taskIDStr == "" {
		logger.Error(ctx, "task_id parameter is required")
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  "task_id parameter is required",
		})
		return
	}

	taskID, err := uuid.FromString(taskIDStr)
	if err != nil {
		logger.Error(ctx, "invalid task ID format", "task_id", taskIDStr, "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  "invalid task ID format",
		})
		return
	}

	pgClient := database.GetPostgresDBClient()
	if pgClient == nil {
		logger.Error(ctx, "database connection not found in context")
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusInternalServerError,
			Msg:  "database connection error",
		})
		return
	}

	// Query task from database
	asyncTask, err := database.GetAsyncTaskByID(ctx, pgClient, taskID)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			logger.Error(ctx, "async task not found", "task_id", taskID)
			c.JSON(http.StatusOK, network.FailureResponse{
				Code: http.StatusNotFound,
				Msg:  "task not found",
			})
			return
		}
		logger.Error(ctx, "failed to query async task from database", "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusInternalServerError,
			Msg:  "failed to query task",
		})
		return
	}

	// Query task result from database
	taskResult, err := database.GetAsyncTaskResult(ctx, pgClient, taskID)
	if err != nil {
		logger.Error(ctx, "failed to query async task result from database", "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusInternalServerError,
			Msg:  "failed to query task result",
		})
		return
	}

	// Convert to response format
	responseTask := network.AsyncTaskResult{
		TaskID:     asyncTask.TaskID,
		TaskType:   string(asyncTask.TaskType),
		Status:     string(asyncTask.Status),
		CreatedAt:  asyncTask.CreatedAt,
		FinishedAt: asyncTask.FinishedAt,
		Progress:   asyncTask.Progress,
	}

	// Add result or error information if available
	if taskResult != nil {
		if taskResult.Result != nil {
			responseTask.Result = map[string]any(taskResult.Result)
		}
		if taskResult.ErrorCode != nil {
			responseTask.ErrorCode = taskResult.ErrorCode
		}
		if taskResult.ErrorMessage != nil {
			responseTask.ErrorMessage = taskResult.ErrorMessage
		}
		if taskResult.ErrorDetail != nil {
			responseTask.ErrorDetail = map[string]any(taskResult.ErrorDetail)
		}
	}

	// Return success response
	c.JSON(http.StatusOK, network.SuccessResponse{
		Code:    2000,
		Msg:     "query completed",
		Payload: responseTask,
	})
}