/**
 * 系统配置API
 * 优先 Prisma，失败时回退到 lib/db（避免 Prisma 连接池超时导致 500）
 */

import { NextRequest, NextResponse } from 'next/server'
import { prisma } from '@/lib/prisma'
import { getPrismaConfig, setPrismaConfig } from '@/lib/prisma-helpers'
import { query } from '@/lib/db'

/**
 * GET - 获取配置
 */
export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url)
  const key = searchParams.get('key')
  
  try {
    if (key) {
      let config = await getPrismaConfig(key)
      if (config == null) {
        const rows = await query(
          'SELECT config_value FROM system_config WHERE config_key = ?',
          [key]
        ) as any[]
        config = rows[0]?.config_value ?? null
      }
      return NextResponse.json({
        success: true,
        data: config
      })
    }
    
    let configs: any[]
    try {
      configs = await prisma.system_config.findMany({
        orderBy: { config_key: 'asc' }
      })
    } catch (e) {
      const rows = await query(
        'SELECT id, config_key, config_value, description, created_at, updated_at FROM system_config ORDER BY config_key ASC'
      ) as any[]
      configs = rows || []
    }
    
    return NextResponse.json({
      success: true,
      data: configs
    })
  } catch (error) {
    console.error('[Config API] GET错误:', error)
    return NextResponse.json({
      success: false,
      error: '获取配置失败'
    }, { status: 500 })
  }
}

/**
 * POST - 创建/更新配置
 */
export async function POST(request: NextRequest) {
  try {
    const body = await request.json()
    const { key, value, description } = body
    
    if (!key) {
      return NextResponse.json({
        success: false,
        error: '配置键不能为空'
      }, { status: 400 })
    }
    
    const valueStr = typeof value === 'string' ? value : JSON.stringify(value ?? null)
    try {
      await setPrismaConfig(key, value, description)
    } catch (e) {
      await query(
        `INSERT INTO system_config (config_key, config_value, description, updated_at) VALUES (?, ?, ?, NOW())
         ON DUPLICATE KEY UPDATE config_value = ?, description = ?, updated_at = NOW()`,
        [key, valueStr, description || null, valueStr, description || null]
      )
    }
    
    return NextResponse.json({
      success: true,
      message: '配置保存成功'
    })
  } catch (error) {
    console.error('[Config API] POST错误:', error)
    return NextResponse.json({
      success: false,
      error: '保存配置失败'
    }, { status: 500 })
  }
}

/**
 * DELETE - 删除配置
 */
export async function DELETE(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url)
    const key = searchParams.get('key')
    
    if (!key) {
      return NextResponse.json({
        success: false,
        error: '配置键不能为空'
      }, { status: 400 })
    }
    
    try {
      await prisma.system_config.delete({
        where: { config_key: key }
      })
    } catch (e: any) {
      if (e.code === 'P2025') {
        return NextResponse.json({
          success: false,
          error: '配置不存在'
        }, { status: 404 })
      }
      await query('DELETE FROM system_config WHERE config_key = ?', [key])
    }
    return NextResponse.json({
      success: true,
      message: '配置删除成功'
    })
  } catch (error: any) {
    console.error('[Config API] DELETE错误:', error)
    return NextResponse.json({
      success: false,
      error: '删除配置失败'
    }, { status: 500 })
  }
}