// =====================================================
// 強制清理連線 API
// =====================================================

import { NextRequest, NextResponse } from 'next/server';
import { db } from '@/lib/database';
import { connectionMonitor } from '@/lib/connection-monitor';

export async function POST(request: NextRequest) {
  try {
    console.log('🧹 開始強制清理資料庫連線...');
    
    // 獲取清理前的連線狀態
    const beforeStats = await connectionMonitor.getConnectionStats();
    console.log(`清理前連線數: ${beforeStats.activeConnections}`);
    
    // 強制關閉連線池
    try {
      await db.close();
      console.log('✅ 主要資料庫連線池已關閉');
    } catch (error) {
      console.error('❌ 關閉主要連線池失敗:', error);
    }
    
    // 等待一段時間讓連線完全關閉
    await new Promise(resolve => setTimeout(resolve, 2000));
    
    // 重新初始化連線池
    try {
      // 重新創建連線池實例
      const { Database } = await import('@/lib/database');
      const newDb = Database.getInstance();
      console.log('✅ 資料庫連線池已重新初始化');
    } catch (error) {
      console.error('❌ 重新初始化連線池失敗:', error);
    }
    
    // 獲取清理後的連線狀態
    const afterStats = await connectionMonitor.getConnectionStats();
    console.log(`清理後連線數: ${afterStats.activeConnections}`);
    
    return NextResponse.json({
      success: true,
      message: '強制清理完成',
      data: {
        before: {
          activeConnections: beforeStats.activeConnections,
          usagePercentage: beforeStats.usagePercentage
        },
        after: {
          activeConnections: afterStats.activeConnections,
          usagePercentage: afterStats.usagePercentage
        },
        cleaned: beforeStats.activeConnections - afterStats.activeConnections
      }
    });

  } catch (error) {
    console.error('強制清理失敗:', error);
    return NextResponse.json({
      success: false,
      message: '強制清理失敗',
      error: error instanceof Error ? error.message : '未知錯誤'
    }, { status: 500 });
  }
}