/**
 * Stats API routes
 */
import express, { type Request, type Response } from 'express';
import { getDatabase } from '../config/database.js';

const router = express.Router();

/**
 * Get overall statistics
 */
router.get('/overall', async (req: Request, res: Response) => {
  try {
    const db = await getDatabase();
    
    // Get total videos count
    const videosResult = await db.get('SELECT COUNT(*) as total FROM videos');
    const totalVideos = videosResult?.total || 0;
    
    // Get total users count
    const usersResult = await db.get('SELECT COUNT(*) as total FROM users');
    const totalUsers = usersResult?.total || 0;
    
    // Get total views (sum of all video views)
    const viewsResult = await db.get('SELECT SUM(views) as total FROM videos');
    const totalViews = viewsResult?.total || 0;
    
    // Get videos uploaded today
    const todayStart = new Date();
    todayStart.setHours(0, 0, 0, 0);
    const todayResult = await db.get(
      'SELECT COUNT(*) as total FROM videos WHERE created_at >= ?',
      [todayStart.toISOString()]
    );
    const todayVideos = todayResult?.total || 0;
    
    res.json({
      success: true,
      data: {
        totalVideos,
        totalUsers,
        totalViews,
        todayVideos
      }
    });
  } catch (error) {
    console.error('获取统计数据失败:', error);
    res.status(500).json({
      success: false,
      error: '获取统计数据失败'
    });
  }
});

/**
 * Get video statistics by category
 */
router.get('/videos/category', async (req: Request, res: Response) => {
  try {
    const db = await getDatabase();
    
    const result = await db.all(`
      SELECT 
        category,
        COUNT(*) as count,
        SUM(views) as totalViews
      FROM videos 
      GROUP BY category
      ORDER BY count DESC
    `);
    
    res.json({
      success: true,
      data: result || []
    });
  } catch (error) {
    console.error('获取分类统计失败:', error);
    res.status(500).json({
      success: false,
      error: '获取分类统计失败'
    });
  }
});

/**
 * Get recent activity stats
 */
router.get('/activity', async (req: Request, res: Response) => {
  try {
    const db = await getDatabase();
    
    // Get videos uploaded in last 7 days
    const weekAgo = new Date();
    weekAgo.setDate(weekAgo.getDate() - 7);
    
    const result = await db.all(`
      SELECT 
        DATE(created_at) as date,
        COUNT(*) as count
      FROM videos 
      WHERE created_at >= ?
      GROUP BY DATE(created_at)
      ORDER BY date DESC
    `, [weekAgo.toISOString()]);
    
    res.json({
      success: true,
      data: result || []
    });
  } catch (error) {
    console.error('获取活动统计失败:', error);
    res.status(500).json({
      success: false,
      error: '获取活动统计失败'
    });
  }
});

/**
 * Get latest videos
 */
router.get('/latest', async (req: Request, res: Response) => {
  try {
    const db = await getDatabase();
    const limit = parseInt(req.query.limit as string) || 10;
    
    const result = await db.all(`
      SELECT 
        id,
        title,
        description,
        cover_url,
        video_url,
        duration,
        views,
        likes,
        category,
        status,
        user_id,
        created_at,
        updated_at
      FROM videos 
      WHERE status = 'published'
      ORDER BY created_at DESC
      LIMIT ?
    `, [limit]);
    
    res.json({
      success: true,
      data: result || []
    });
  } catch (error) {
    console.error('获取最新视频失败:', error);
    res.status(500).json({
      success: false,
      error: '获取最新视频失败'
    });
  }
});

/**
 * Get recent users
 */
router.get('/recent-users', async (req: Request, res: Response) => {
  try {
    const db = await getDatabase();
    const limit = parseInt(req.query.limit as string) || 10;
    
    const result = await db.all(`
      SELECT 
        id,
        username,
        email,
        avatar,
        role,
        created_at,
        updated_at
      FROM users 
      ORDER BY created_at DESC
      LIMIT ?
    `, [limit]);
    
    res.json({
      success: true,
      data: result || []
    });
  } catch (error) {
    console.error('获取最近用户失败:', error);
    res.status(500).json({
      success: false,
      error: '获取最近用户失败'
    });
  }
});

export default router;