import type { Context } from '@netlify/functions'
import { guardMethod } from '../utils/method.js'
import { fail, ok } from '../utils/http.js'
import { readJson } from '../utils/request.js'
import { prisma } from '../utils/prisma.js'
import { withErrorBoundary } from '../utils/handler.js'

type OrderPayRequest = {
  supplierId?: string
  token?: string
  orderId?: string
  amount?: number
  totalPrice?: number
  wPayOrAPay?: number
  pointsPrice?: number
}

type BridgePayResponse = {
  resultCode?: number
  message?: string
}

const normalizeBase = (base: string) => base.replace(/\/$/, '')
const centsToYuan = (value?: number) => Number((Number(value || 0) / 100).toFixed(2))

export default withErrorBoundary(async (request: Request, _context: Context) => {
  const methodResponse = guardMethod(request, ['POST'])
  if (methodResponse) return methodResponse

  const body = await readJson<OrderPayRequest>(request)
  const supplierId = String(body.supplierId || '').trim()
  const token = String(body.token || '').trim()
  const orderId = String(body.orderId || '').trim()
  const totalPrice = Number(body.totalPrice ?? centsToYuan(body.amount))
  const wPayOrAPay = Number(body.wPayOrAPay ?? 0)
  const pointsPrice = Number(body.pointsPrice ?? totalPrice)

  if (!supplierId || !token || !orderId) {
    return fail('供应商、授权或订单信息不能为空')
  }

  if (totalPrice <= 0) {
    return fail('支付金额必须大于0')
  }

  const apiBase = normalizeBase(process.env.POINTS_MALL_OPEN_API_BASE || '')
  if (!apiBase) {
    return fail('平台积分商城接口地址未配置', 500, 'OPEN_API_BASE_MISSING')
  }

  const order = await prisma.supplierOrderMain.findUnique({
    where: { orderId }
  })

  if (!order || order.deleted === 1) {
    return fail('待支付订单不存在', 404, 'ORDER_NOT_FOUND')
  }

  const bridgeResponse = await fetch(`${apiBase}/pointOrder/confirmPurchase`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      token
    },
    body: JSON.stringify({
      supplierId,
      orderId,
      totalPrice,
      wPayOrAPay,
      pointsPrice,
      token
    })
  })

  const bridgePayload = (await bridgeResponse.json().catch(() => ({}))) as BridgePayResponse

  if (!bridgeResponse.ok || bridgePayload.resultCode !== 0) {
    return fail(bridgePayload.message || '确认购买失败', 502, 'BRIDGE_CONFIRM_PURCHASE_FAILED')
  }

  await prisma.$transaction(async tx => {
    await tx.supplierOrderMain.update({
      where: { orderId },
      data: {
        orderState: 1,
        totalPrice,
        wPayOrAPay,
        pointsPrice,
        updateTime: new Date()
      }
    })

    await tx.supplierOrderSub.updateMany({
      where: { mainOrderId: orderId, deleted: 0 },
      data: {
        orderState: 1,
        totalPrice,
        wPayOrAPay,
        pointsPrice,
        updateTime: new Date()
      }
    })
  })

  const subOrders = await prisma.supplierOrderSub.findMany({
    where: {
      mainOrderId: orderId,
      deleted: 0
    },
    select: {
      orderId: true
    }
  })
  const subOrderIds = subOrders.map(item => item.orderId).filter(Boolean).join(',')

  if (subOrderIds) {
    const splitResponse = await fetch(`${apiBase}/pointOrder/pushOrderInfoMsg`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        token
      },
      body: JSON.stringify({
        supplierId,
        orderType: 2,
        orderId: subOrderIds,
        mainOrderId: orderId,
        userId: order.userId,
        time: Date.now(),
        token
      })
    })

    const splitPayload = (await splitResponse.json().catch(() => ({}))) as BridgePayResponse

    if (!splitResponse.ok || splitPayload.resultCode !== 0) {
      return fail(splitPayload.message || '推送拆单信息失败', 502, 'BRIDGE_SPLIT_ORDER_FAILED')
    }
  }

  return ok({
    orderId,
    subOrderIds,
    totalPrice,
    wPayOrAPay,
    pointsPrice
  })
})