// =====================================================
// 連線監控 API
// =====================================================

import { NextRequest, NextResponse } from 'next/server';
import { smartPool } from '@/lib/smart-connection-pool';

export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const action = searchParams.get('action') || 'stats';

    switch (action) {
      case 'stats':
        // 獲取連線統計
        const stats = smartPool.getConnectionStats();
        return NextResponse.json({
          success: true,
          message: '連線統計獲取成功',
          data: stats
        });

      case 'cleanup':
        // 強制清理連線
        console.log('🧹 執行強制連線清理...');
        smartPool.forceCleanup();
        const newStats = smartPool.getConnectionStats();
        return NextResponse.json({
          success: true,
          message: '連線清理完成',
          data: newStats
        });

      case 'test':
        // 測試智能連線
        try {
          const testResult = await smartPool.executeQueryOne(
            'SELECT 1 as test_value',
            [],
            { userId: 'test', sessionId: 'test-session', requestId: 'test-request' }
          );
          
          return NextResponse.json({
            success: true,
            message: '智能連線測試成功',
            data: {
              testResult,
              stats: smartPool.getConnectionStats()
            }
          });
        } catch (error) {
          return NextResponse.json({
            success: false,
            error: '智能連線測試失敗',
            details: error instanceof Error ? error.message : '未知錯誤'
          }, { status: 500 });
        }

      default:
        return NextResponse.json({
          success: false,
          error: '無效的操作參數',
          availableActions: ['stats', 'cleanup', 'test']
        }, { status: 400 });
    }

  } catch (error) {
    console.error('❌ 連線監控 API 錯誤:', error);
    return NextResponse.json({
      success: false,
      error: 'API 請求失敗',
      details: error instanceof Error ? error.message : '未知錯誤'
    }, { status: 500 });
  }
}

export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const { action, maxIdleTime, maxConnectionAge } = body;

    switch (action) {
      case 'config':
        // 更新清理配置
        smartPool.setCleanupParams(maxIdleTime, maxConnectionAge);
        return NextResponse.json({
          success: true,
          message: '清理配置更新成功',
          data: {
            maxIdleTime: maxIdleTime || '未變更',
            maxConnectionAge: maxConnectionAge || '未變更'
          }
        });

      case 'cleanup':
        // 強制清理連線
        console.log('🧹 執行強制連線清理...');
        smartPool.forceCleanup();
        const stats = smartPool.getConnectionStats();
        return NextResponse.json({
          success: true,
          message: '連線清理完成',
          data: stats
        });

      default:
        return NextResponse.json({
          success: false,
          error: '無效的操作參數',
          availableActions: ['config', 'cleanup']
        }, { status: 400 });
    }

  } catch (error) {
    console.error('❌ 連線監控 POST API 錯誤:', error);
    return NextResponse.json({
      success: false,
      error: 'API 請求失敗',
      details: error instanceof Error ? error.message : '未知錯誤'
    }, { status: 500 });
  }
}