import {
  BRAND_LOGO_MARK_URL,
  BRAND_LOGO_URL,
  BRAND_LOGO_WIDE_URL,
  CUSTOMER_SERVICE_PHONE,
  QUALIFICATION_DISCLOSURE_URL,
  type ClientRuntimeConfig,
} from '@dukang/shared-types';
import { fetchClientConfig } from './pay-wechat';

export type BrandAssets = {
  brandLogoUrl: string;
  brandLogoWideUrl: string;
  brandLogoMarkUrl: string;
  qualificationDisclosureUrl: string;
  customerServicePhone: string;
};

const FALLBACK: BrandAssets = {
  brandLogoUrl: BRAND_LOGO_URL,
  brandLogoWideUrl: BRAND_LOGO_WIDE_URL,
  brandLogoMarkUrl: BRAND_LOGO_MARK_URL,
  qualificationDisclosureUrl: QUALIFICATION_DISCLOSURE_URL,
  customerServicePhone: CUSTOMER_SERVICE_PHONE,
};

let cached: BrandAssets | null = null;
let inflight: Promise<BrandAssets> | null = null;

function fromConfig(config: ClientRuntimeConfig | null | undefined): BrandAssets {
  return {
    brandLogoUrl: config?.brandLogoUrl?.trim() || FALLBACK.brandLogoUrl,
    brandLogoWideUrl: config?.brandLogoWideUrl?.trim() || FALLBACK.brandLogoWideUrl,
    brandLogoMarkUrl: config?.brandLogoMarkUrl?.trim() || FALLBACK.brandLogoMarkUrl,
    qualificationDisclosureUrl:
      config?.qualificationDisclosureUrl?.trim() || FALLBACK.qualificationDisclosureUrl,
    customerServicePhone: config?.customerServicePhone?.trim() || FALLBACK.customerServicePhone,
  };
}

/** 同步读取最近一次缓存（未拉取前返回代码默认常量） */
export function getBrandAssetsSync(): BrandAssets {
  return cached ?? FALLBACK;
}

/** 拉取 /common/client-config 中的品牌与客服配置并缓存 */
export async function loadBrandAssets(force = false): Promise<BrandAssets> {
  if (!force && cached) return cached;
  if (!force && inflight) return inflight;
  inflight = fetchClientConfig()
    .then((cfg) => {
      cached = fromConfig(cfg);
      return cached;
    })
    .catch(() => {
      cached = FALLBACK;
      return cached;
    })
    .finally(() => {
      inflight = null;
    });
  return inflight;
}

export function applyBrandFromClientConfig(config: ClientRuntimeConfig | null | undefined) {
  cached = fromConfig(config);
  return cached;
}