import { NextRequest, NextResponse } from 'next/server'
import { prisma } from '@/lib/prisma'
import { verifyToken } from '@/lib/auth'

// 更新购物车项数量
export async function PUT(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params
    
    const authHeader = request.headers.get('authorization')
    if (!authHeader || !authHeader.startsWith('Bearer ')) {
      return NextResponse.json(
        { message: '请先登录' },
        { status: 401 }
      )
    }

    const token = authHeader.substring(7)
    const decoded = verifyToken(token)
    if (!decoded) {
      return NextResponse.json(
        { message: '登录已过期' },
        { status: 401 }
      )
    }

    const { quantity } = await request.json()

    if (!quantity || quantity < 1) {
      return NextResponse.json(
        { message: '数量必须大于0' },
        { status: 400 }
      )
    }

    // 检查购物车项是否属于当前用户
    const cartItem = await prisma.cartItem.findFirst({
      where: {
        id: id,
        userId: decoded.userId
      },
      include: {
        component: true
      }
    })

    if (!cartItem) {
      return NextResponse.json(
        { message: '购物车项不存在' },
        { status: 404 }
      )
    }

    // 检查库存
    if (quantity > cartItem.component.stock) {
      return NextResponse.json(
        { message: '库存不足' },
        { status: 400 }
      )
    }

    const updatedCartItem = await prisma.cartItem.update({
      where: { id: id },
      data: { quantity: quantity },
      include: {
        component: {
          include: {
            componentType: true
          }
        }
      }
    })

    return NextResponse.json(updatedCartItem)
  } catch (error) {
    console.error('更新购物车项失败:', error)
    return NextResponse.json(
      { message: '更新购物车项失败' },
      { status: 500 }
    )
  }
}

// 删除购物车项
export async function DELETE(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params
    
    const authHeader = request.headers.get('authorization')
    if (!authHeader || !authHeader.startsWith('Bearer ')) {
      return NextResponse.json(
        { message: '请先登录' },
        { status: 401 }
      )
    }

    const token = authHeader.substring(7)
    const decoded = verifyToken(token)
    if (!decoded) {
      return NextResponse.json(
        { message: '登录已过期' },
        { status: 401 }
      )
    }

    // 检查购物车项是否属于当前用户
    const cartItem = await prisma.cartItem.findFirst({
      where: {
        id: id,
        userId: decoded.userId
      }
    })

    if (!cartItem) {
      return NextResponse.json(
        { message: '购物车项不存在' },
        { status: 404 }
      )
    }

    await prisma.cartItem.delete({
      where: { id: id }
    })

    return NextResponse.json({ message: '已从购物车移除' })
  } catch (error) {
    console.error('删除购物车项失败:', error)
    return NextResponse.json(
      { message: '删除购物车项失败' },
      { status: 500 }
    )
  }
}