import { createRequestError } from './request-client.js'
import { normalizeOptionalNumericId } from './response-normalizers.js'

const normalizeVipText = (value, field, { required = false } = {}) => {
  if (value === undefined || value === null) {
    if (required) throw createRequestError(`VIP 响应缺少 ${field}`, 'VIP_RESPONSE_INVALID')
    return ''
  }
  if (typeof value !== 'string') {
    throw createRequestError(`VIP 响应 ${field} 无效`, 'VIP_RESPONSE_INVALID')
  }
  const text = value.trim()
  if (required && !text) throw createRequestError(`VIP 响应缺少 ${field}`, 'VIP_RESPONSE_INVALID')
  return text
}

const normalizeVipAmount = (value, field, { required = false } = {}) => {
  if (value === undefined || value === null || value === '') {
    if (required) throw createRequestError(`VIP 响应缺少 ${field}`, 'VIP_RESPONSE_INVALID')
    return ''
  }
  const text = typeof value === 'number' && Number.isFinite(value) ? String(value) : value
  if (typeof text !== 'string') throw createRequestError(`VIP 响应 ${field} 无效`, 'VIP_RESPONSE_INVALID')
  const match = text.trim().match(/^(0|[1-9]\d*)(?:\.(\d{1,2}))?$/)
  if (!match) throw createRequestError(`VIP 响应 ${field} 无效`, 'VIP_RESPONSE_INVALID')
  return `${match[1]}.${(match[2] || '').padEnd(2, '0')}`
}

const vipOrderStatusFallbackLabels = Object.freeze({
  '0': '待支付',
  '1': '已支付',
  '2': '已关闭',
  '3': '已退款'
})

const normalizeVipOrderStatus = (value) => {
  const status = normalizeVipText(value, 'payStatus', { required: true })
  return {
    status,
    statusLabel: vipOrderStatusFallbackLabels[status] || '状态待确认'
  }
}

export const normalizeVipPackages = (value) => {
  if (!Array.isArray(value)) throw createRequestError('VIP 套餐响应不是列表', 'VIP_RESPONSE_INVALID')
  const packages = value.map((item) => {
    if (!item || typeof item !== 'object' || Array.isArray(item)) {
      throw createRequestError('VIP 套餐响应包含无效条目', 'VIP_RESPONSE_INVALID')
    }
    const id = normalizeOptionalNumericId(item.packageId, 'VIP 套餐标识', 'VIP_RESPONSE_INVALID')
    if (!id) throw createRequestError('VIP 套餐响应缺少稳定标识', 'VIP_RESPONSE_INVALID')
    return {
      key: `vip-package-${id}`,
      id,
      name: normalizeVipText(item.packageName, 'packageName', { required: true }),
      description: normalizeVipText(item.packageDesc, 'packageDesc'),
      price: normalizeVipAmount(item.price, 'price', { required: true }),
      originalPrice: normalizeVipAmount(item.originalPrice, 'originalPrice')
    }
  })
  if (new Set(packages.map((item) => item.id)).size !== packages.length) {
    throw createRequestError('VIP 套餐响应包含重复标识', 'VIP_RESPONSE_INVALID')
  }
  return packages
}

export const normalizeVipOrders = (value) => {
  if (!Array.isArray(value)) throw createRequestError('VIP 订单响应不是列表', 'VIP_RESPONSE_INVALID')
  const orders = value.map((item) => {
    if (!item || typeof item !== 'object' || Array.isArray(item)) {
      throw createRequestError('VIP 订单响应包含无效条目', 'VIP_RESPONSE_INVALID')
    }
    const id = normalizeOptionalNumericId(item.orderId, 'VIP 订单标识', 'VIP_RESPONSE_INVALID')
    if (!id) throw createRequestError('VIP 订单响应缺少稳定标识', 'VIP_RESPONSE_INVALID')
    const { status, statusLabel } = normalizeVipOrderStatus(item.payStatus)
    return {
      key: `vip-order-${id}`,
      id,
      packageName: normalizeVipText(item.packageName, 'packageName', { required: true }),
      amount: normalizeVipAmount(item.payAmount ?? item.orderAmount, 'payAmount', { required: true }),
      status,
      statusLabel,
      paidAt: normalizeVipText(item.payTime, 'payTime'),
      expiresAt: normalizeVipText(item.expireTime, 'expireTime')
    }
  })
  if (new Set(orders.map((item) => item.id)).size !== orders.length) {
    throw createRequestError('VIP 订单响应包含重复标识', 'VIP_RESPONSE_INVALID')
  }
  return orders
}

export const normalizeVipCapability = (value) => {
  if (!value || typeof value !== 'object' || Array.isArray(value) || typeof value.enabled !== 'boolean') {
    throw createRequestError('VIP 购买能力响应无效', 'VIP_RESPONSE_INVALID')
  }
  return {
    enabled: value.enabled,
    disabledReason: normalizeVipText(value.disabledReason, 'disabledReason')
  }
}