import type { LocalDeliveryDto } from '@dukang/shared-types';
import { DEFAULT_LOCAL_DELIVERY_HINT } from '@dukang/shared-types';
import { request } from './api';

export { DEFAULT_LOCAL_DELIVERY_HINT };

const CACHE_TTL_MS = 60_000;
let cached: LocalDeliveryDto[] | null = null;
let cachedAt = 0;
let inflight: Promise<LocalDeliveryDto[]> | null = null;

function cityAliases(name: string): string[] {
  const raw = name.trim();
  if (!raw) return [];
  const noSuffix = raw.replace(/市$/, '');
  const withSuffix = raw.endsWith('市') ? raw : `${raw}市`;
  return [raw, noSuffix, withSuffix];
}

export async function loadLocalDeliveries(force = false): Promise<LocalDeliveryDto[]> {
  if (!force && cached && Date.now() - cachedAt < CACHE_TTL_MS) return cached;
  if (!force && inflight) return inflight;
  inflight = request<LocalDeliveryDto[]>('/catalog/local-deliveries')
    .then((list) => {
      cached = Array.isArray(list) ? list : [];
      cachedAt = Date.now();
      return cached;
    })
    .catch(() => {
      cached = cached ?? [];
      return cached;
    })
    .finally(() => {
      inflight = null;
    });
  return inflight;
}

export function matchLocalDelivery(
  list: LocalDeliveryDto[],
  opts: { cityCode?: string | null; cityName?: string | null },
): LocalDeliveryDto | null {
  const code = String(opts.cityCode || '').trim();
  if (code) {
    const byCode = list.find((row) => row.city.code === code);
    if (byCode) return byCode;
  }
  const names = new Set(cityAliases(String(opts.cityName || '')));
  if (!names.size) return null;
  return list.find((row) => cityAliases(row.city.name).some((n) => names.has(n))) ?? null;
}

export function resolveLocalDeliveryHintHtml(row: LocalDeliveryDto | null): string {
  const html = row?.hintHtml?.trim();
  if (html) return html;
  return DEFAULT_LOCAL_DELIVERY_HINT;
}