import {
  REGION_ALL,
  isShippingRegionComplete,
  normalizeShippingRegionSelection,
  type RegionSelection,
} from './region-data';

export const SHIPPING_DETAIL_MIN_LEN = 8;
export const SHIPPING_REGION_REQUIRED_MSG = '请选择具体区县';
export const SHIPPING_DETAIL_REQUIRED_MSG = '请填写详细地址';
export const SHIPPING_DETAIL_TOO_SHORT_MSG = '请填写更详细的收货地址（含街道门牌）';

export type ShippingAddressLike = {
  province?: string | null;
  city?: string | null;
  district?: string | null;
  detail?: string | null;
};

export function isDirtyShippingAddress(addr: ShippingAddressLike): boolean {
  return !validateClientShippingAddress(addr).ok;
}

export function validateClientShippingAddress(addr: ShippingAddressLike): {
  ok: boolean;
  message?: string;
} {
  const province = String(addr.province ?? '').trim();
  const city = String(addr.city ?? '').trim();
  const district = String(addr.district ?? '').trim();
  const detail = String(addr.detail ?? '').trim();

  if (!province || !city) return { ok: false, message: '请选择所在地区' };
  if (!district || district === REGION_ALL || district === '全部') {
    return { ok: false, message: SHIPPING_REGION_REQUIRED_MSG };
  }
  const regionOk = isShippingRegionComplete({ province, city, district });
  if (!regionOk) {
    return { ok: false, message: SHIPPING_REGION_REQUIRED_MSG };
  }
  if (!detail) return { ok: false, message: SHIPPING_DETAIL_REQUIRED_MSG };
  if (detail.length < SHIPPING_DETAIL_MIN_LEN) {
    return { ok: false, message: SHIPPING_DETAIL_TOO_SHORT_MSG };
  }
  return { ok: true };
}

export function shippingDetailCityWideHint(detail: string | null | undefined): string | null {
  const d = String(detail ?? '').trim();
  if (!d.includes('全市')) return null;
  if (/路|街|巷|号|大厦|广场|小区|村|镇|乡/.test(d)) return null;
  return '详细地址含「全市」，建议改为具体街道门牌，以免配送拒单';
}

export function toShippingRegion(addr: ShippingAddressLike): RegionSelection {
  return normalizeShippingRegionSelection({
    province: String(addr.province ?? ''),
    city: String(addr.city ?? ''),
    district: String(addr.district ?? ''),
  });
}