import { NextRequest, NextResponse } from 'next/server'
import { getServerSession } from 'next-auth'
import { authOptions } from '@/lib/auth'
import { prisma } from '@/lib/prisma'
import { uploadToS3 } from '@/lib/s3'

// POST - 上传LOGO（仅管理员）
export async function POST(request: NextRequest) {
  try {
    const session = await getServerSession(authOptions)

    if (!session || session.user.role !== 'ADMIN') {
      return NextResponse.json(
        { error: '无权限' },
        { status: 403 }
      )
    }

    // 将NextRequest转换为Node.js IncomingMessage
    const formData = await request.formData()
    const logoFile = formData.get('logo') as File
    const logoType = formData.get('type') as string // 'header' or 'login'

    if (!logoFile) {
      return NextResponse.json(
        { error: '请选择LOGO文件' },
        { status: 400 }
      )
    }

    if (!logoType || !['header', 'login'].includes(logoType)) {
      return NextResponse.json(
        { error: '请指定LOGO类型（header或login）' },
        { status: 400 }
      )
    }

    // 验证文件类型
    if (!logoFile.type.startsWith('image/')) {
      return NextResponse.json(
        { error: '只支持图片格式' },
        { status: 400 }
      )
    }

    // 转换File为Buffer
    const bytes = await logoFile.arrayBuffer()
    const buffer = Buffer.from(bytes)

    // 生成文件名
    const timestamp = Date.now()
    const ext = logoFile.name.split('.').pop()
    const filename = `${logoType}-logo-${timestamp}.${ext}`

    // 上传到S3
    const s3Url = await uploadToS3(buffer, filename, logoFile.type)

    // 更新系统设置
    let settings = await prisma.systemSettings.findFirst()

    const fieldName = logoType === 'header' ? 'headerLogoUrl' : 'loginLogoUrl'

    if (!settings) {
      settings = await prisma.systemSettings.create({
        data: {
          [fieldName]: s3Url
        }
      })
    } else {
      settings = await prisma.systemSettings.update({
        where: { id: settings.id },
        data: {
          [fieldName]: s3Url
        }
      })
    }

    return NextResponse.json({
      success: true,
      logoUrl: s3Url,
      type: logoType
    })
  } catch (error) {
    console.error('Upload logo error:', error)
    return NextResponse.json(
      { error: '上传LOGO失败' },
      { status: 500 }
    )
  }
}