import { NextRequest, NextResponse } from 'next/server';
import pool from '@/lib/db';
import { getAllFields } from '@/lib/field-mapping';

// GET - 获取所有配置
export async function GET() {
  try {
    // 先返回字段列表（不依赖数据库）
    const availableFields = getAllFields();
    
    // 尝试查询配置（如果表不存在会失败）
    let configs: any[] = [];
    try {
      const connection = await pool.getConnection();
      const [configRows] = await connection.query<any[]>(
        'SELECT * FROM t_daily_report_config WHERE is_active = 1 ORDER BY create_time DESC'
      );
      configs = configRows || [];
      connection.release();
    } catch (dbError) {
      // 如果表不存在，返回空数组
      console.log('配置表查询失败，可能是表未初始化:', dbError);
      configs = [];
    }
    
    return NextResponse.json({ 
      success: true, 
      data: configs,
      availableFields: availableFields
    });
  } catch (error) {
    return NextResponse.json({ 
      success: false, 
      message: '获取配置失败',
      error: error instanceof Error ? error.message : '未知错误'
    }, { status: 500 });
  }
}

// POST - 创建新配置
export async function POST(request: NextRequest) {
  try {
    const body = await request.json();
    const { 
      config_name, 
      split_type, 
      split_value, 
      split_name, 
      selected_fields,
      sum_fields 
    } = body;
    
    // 验证必填字段
    if (!config_name || !split_type || !split_value || !selected_fields || selected_fields.length === 0) {
      return NextResponse.json({ 
        success: false, 
        message: '缺少必填字段（配置名称、拆分方式、拆分值、选择的字段）' 
      }, { status: 400 });
    }
    
    // 验证拆分方式
    if (split_type !== 'company_id' && split_type !== 'user_id') {
      return NextResponse.json({ 
        success: false, 
        message: '拆分方式必须是 company_id 或 user_id' 
      }, { status: 400 });
    }
    
    // 获取连接
    const connection = await pool.getConnection();
    
    // 插入配置
    await connection.query(
      `INSERT INTO t_daily_report_config 
       (config_name, split_type, split_value, split_name, selected_fields, sum_fields) 
       VALUES (?, ?, ?, ?, ?, ?)`,
      [
        config_name, 
        split_type, 
        split_value, 
        split_name || null,
        JSON.stringify(selected_fields),
        sum_fields ? JSON.stringify(sum_fields) : null
      ]
    );
    
    connection.release();
    
    return NextResponse.json({ 
      success: true, 
      message: '配置创建成功'
    });
  } catch (error) {
    return NextResponse.json({ 
      success: false, 
      message: '创建配置失败',
      error: error instanceof Error ? error.message : '未知错误'
    }, { status: 500 });
  }
}