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

import (
	"net/http"

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

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

// AsyncTaskResultQueryHandler handles querying of asynchronous task results
// @Summary 查询异步任务结果
// @Description 根据任务ID列表查询异步任务的状态和结果
// @Tags AsyncTask
// @Accept json
// @Produce json
// @Param task_ids query string true "任务ID列表，用逗号分隔"
// @Success 200 {object} network.SuccessResponse{payload=network.AsyncTaskResultQueryResponse} "查询成功"
// @Failure 400 {object} network.FailureResponse "请求参数错误"
// @Failure 500 {object} network.FailureResponse "服务器内部错误"
// @Router /task/async/results [get]
func AsyncTaskResultQueryHandler(c *gin.Context) {
	ctx := c.Request.Context()

	// Parse task IDs from query parameter
	taskIDsParam := c.Query("task_ids")
	if taskIDsParam == "" {
		logger.Error(ctx, "task_ids parameter is required")
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  "task_ids parameter is required",
		})
		return
	}

	// Parse comma-separated task IDs
	var taskIDs []uuid.UUID
	taskIDStrs := splitCommaSeparated(taskIDsParam)
	for _, taskIDStr := range taskIDStrs {
		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
		}
		taskIDs = append(taskIDs, taskID)
	}

	if len(taskIDs) == 0 {
		logger.Error(ctx, "no valid task IDs provided")
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  "no valid task IDs provided",
		})
		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 tasks from database
	asyncTasks, err := database.GetAsyncTasksByIDs(ctx, pgClient, taskIDs)
	if err != nil {
		logger.Error(ctx, "failed to query async tasks from database", "error", err)
		c.JSON(http.StatusOK, network.FailureResponse{
			Code: http.StatusInternalServerError,
			Msg:  "failed to query tasks",
		})
		return
	}

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

	// Create a map of task results for easy lookup
	taskResultMap := make(map[uuid.UUID]orm.AsyncTaskResult)
	for _, result := range taskResults {
		taskResultMap[result.TaskID] = result
	}

	// Convert to response format
	var responseTasks []network.AsyncTaskResult
	for _, asyncTask := range asyncTasks {
		taskResult := 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 result, exists := taskResultMap[asyncTask.TaskID]; exists {
			if result.Result != nil {
				taskResult.Result = map[string]any(result.Result)
			}
			if result.ErrorCode != nil {
				taskResult.ErrorCode = result.ErrorCode
			}
			if result.ErrorMessage != nil {
				taskResult.ErrorMessage = result.ErrorMessage
			}
			if result.ErrorDetail != nil {
				taskResult.ErrorDetail = map[string]any(result.ErrorDetail)
			}
		}

		responseTasks = append(responseTasks, taskResult)
	}

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