package handlers

import (
	"ankao/internal/database"
	"ankao/internal/models"
	"net/http"
	"strconv"

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

// HomeHandler 首页处理器
func HomeHandler(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"message": "欢迎使用AnKao Web服务",
		"version": "1.0.0",
	})
}

// HealthCheckHandler 健康检查处理器
func HealthCheckHandler(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"status": "healthy",
	})
}

// GetDailyRanking 获取今日排行榜
func GetDailyRanking(c *gin.Context) {
	db := database.GetDB()

	// 获取查询参数
	limitStr := c.DefaultQuery("limit", "10")
	limit, err := strconv.Atoi(limitStr)
	if err != nil || limit <= 0 || limit > 100 {
		limit = 10
	}

	// 查询今日排行榜（按答题数量和正确率排序）
	var rankings []models.UserStats

	query := `
		SELECT
			u.id as user_id,
			u.username,
			u.nickname,
			u.avatar,
			u.user_type,
			COALESCE(COUNT(ar.id), 0) as total_answers,
			COALESCE(SUM(CASE WHEN ar.is_correct = true THEN 1 ELSE 0 END), 0) as correct_count,
			COALESCE(SUM(CASE WHEN ar.is_correct = false THEN 1 ELSE 0 END), 0) as wrong_count,
			CASE
				WHEN COUNT(ar.id) > 0 THEN
					ROUND(CAST(CAST(SUM(CASE WHEN ar.is_correct = true THEN 1 ELSE 0 END) AS FLOAT) / COUNT(ar.id) * 100 AS NUMERIC), 2)
				ELSE 0
			END as accuracy,
			u.created_at,
			MAX(ar.answered_at) as last_answer_at
		FROM users u
		LEFT JOIN user_answer_records ar ON u.id = ar.user_id
			AND ar.deleted_at IS NULL
			AND DATE(ar.answered_at) = CURRENT_DATE
		WHERE u.deleted_at IS NULL
		GROUP BY u.id, u.username, u.nickname, u.avatar, u.user_type, u.created_at
		HAVING COUNT(ar.id) > 0
		ORDER BY total_answers DESC, accuracy DESC, correct_count DESC
		LIMIT ?
	`

	if err := db.Raw(query, limit).Scan(&rankings).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{
			"success": false,
			"message": "获取排行榜数据失败",
			"error":   err.Error(),
		})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"success": true,
		"data":    rankings,
	})
}