package handler

import (
	"net/http"

	"soul-api/internal/database"

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

// AdminChapterClickStats GET /api/admin/chapters/:id/click-stats
// 聚合 user_tracks 表，返回指定章节的点击用户列表（昵称、次数、最近时间）
func AdminChapterClickStats(c *gin.Context) {
	chapterID := c.Param("id")
	if chapterID == "" {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": "missing chapter id"})
		return
	}

	db := database.DB()

	type clickUser struct {
		UserID   string `json:"userId"`
		Nickname string `json:"nickname"`
		Avatar   string `json:"avatar"`
		Count    int    `json:"count"`
		LastClick string `json:"lastClick"`
	}

	var results []clickUser
	err := db.Raw(`
		SELECT ut.user_id, COALESCE(u.nickname,'') AS nickname, COALESCE(u.avatar,'') AS avatar,
		       COUNT(*) AS count, MAX(ut.created_at) AS last_click
		FROM user_tracks ut
		LEFT JOIN users u ON ut.user_id = u.id
		WHERE ut.chapter_id = ? AND ut.action = 'view_chapter'
		GROUP BY ut.user_id, u.nickname, u.avatar
		ORDER BY count DESC
		LIMIT 200
	`, chapterID).Scan(&results).Error

	if err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "error": err.Error()})
		return
	}

	totalClicks := 0
	for _, r := range results {
		totalClicks += r.Count
	}

	c.JSON(http.StatusOK, gin.H{
		"success":     true,
		"totalClicks": totalClicks,
		"users":       results,
	})
}