import type { ClientRuntimeConfig, WechatLoginResult } from '@dukang/shared-types';
import { isWxAuthorizeEnabled } from '@dukang/shared-types';
import { WECHAT_INAPP_REQUIRED_MSG } from '@dukang/weixin-sdk';
import { isWechatEnv, weixinSdk } from './weixin';
import { markScanWarmupAfterAuth } from './shop-scan-auth';
import { request, saveWechatSession, type ShopSessionPayload } from './api';

export type ShopAccountProfile = {
  id: string;
  storeId: string;
  name: string;
  phone: string;
  /** 是否已绑定微信（来自 /shop/auth/me account.hasWechat） */
  hasWechat?: boolean;
  wxOpenId?: string | null;
  store?: { name: string };
};

/** 微信未绑定门店账号时的登录提示 */
export const SHOP_WX_NEED_PHONE_LOGIN_MSG = '请先用手机号登录';

const SHOP_WX_LOGIN_HINT_KEY = 'shop_wx_login_hint';

export function isShopWechatUnboundError(message: string): boolean {
  return message.includes('首次登录') || message.includes('手机验证码') || message.includes('请先用手机号');
}

export function formatShopWechatError(e: unknown): string {
  const text = e instanceof Error ? e.message : '微信登录失败';
  if (isShopWechatUnboundError(text)) return SHOP_WX_NEED_PHONE_LOGIN_MSG;
  return text;
}

/** OAuth 在启动层失败时暂存提示，供登录页展示 */
export function stashShopWechatLoginHint(message: string): void {
  try {
    sessionStorage.setItem(SHOP_WX_LOGIN_HINT_KEY, message);
  } catch {
    /* ignore */
  }
}

export function consumeShopWechatLoginHint(): string | null {
  try {
    const hint = sessionStorage.getItem(SHOP_WX_LOGIN_HINT_KEY);
    if (hint) sessionStorage.removeItem(SHOP_WX_LOGIN_HINT_KEY);
    return hint;
  } catch {
    return null;
  }
}

export async function fetchClientConfig(): Promise<ClientRuntimeConfig> {
  return request<ClientRuntimeConfig>('SHOP_H5', '/common/client-config');
}

export async function fetchShopAccount(): Promise<ShopAccountProfile> {
  const me = await request<{
    id?: string;
    storeId?: string;
    name?: string;
    phone?: string;
    account?: {
      id?: string;
      name?: string;
      phone?: string;
      hasWechat?: boolean;
    };
    store?: { name?: string } | null;
  }>('SHOP_H5', '/shop/auth/me');
  return {
    id: String(me.account?.id ?? me.id ?? ''),
    storeId: String(me.storeId ?? ''),
    name: String(me.account?.name ?? me.name ?? ''),
    phone: String(me.account?.phone ?? me.phone ?? ''),
    hasWechat: !!me.account?.hasWechat,
    store: me.store?.name ? { name: String(me.store.name) } : undefined,
  };
}

export function needsWechatAuth(
  profile: ShopAccountProfile | null,
  config?: Pick<ClientRuntimeConfig, 'wxAuthorize'> | null,
): boolean {
  if (config && !isWxAuthorizeEnabled(config)) return false;
  const unbound = !!profile && !(profile.hasWechat || profile.wxOpenId);
  return isWechatEnv() && unbound;
}

export async function checkNeedsWechatAuth(profile: ShopAccountProfile | null): Promise<boolean> {
  const config = await fetchClientConfig();
  return needsWechatAuth(profile, config);
}

export function sessionFromWechatLogin(result: WechatLoginResult): ShopSessionPayload | null {
  if (!result.accessToken || !result.refreshToken) return null;
  const store = result.store as Record<string, unknown> | undefined;
  const stores = Array.isArray((result as { stores?: unknown }).stores)
    ? ((result as { stores: ShopSessionPayload['stores'] }).stores)
    : undefined;
  const account = (result as { account?: ShopSessionPayload['account'] }).account;
  return {
    accessToken: result.accessToken,
    refreshToken: result.refreshToken,
    stores,
    account,
    selectedStoreId: (result as { selectedStoreId?: string }).selectedStoreId,
    store: store
      ? {
          id: String(store.id ?? account?.id ?? ''),
          storeId: String(store.storeId ?? ''),
          name: String(store.name ?? account?.name ?? ''),
          phone: String(store.phone ?? account?.phone ?? ''),
          storeName: String(store.storeName ?? store.name ?? ''),
          isPrimary: account?.isPrimary,
          stores,
        }
      : undefined,
  };
}

/** 处理微信登录/绑定结果，写入 7 天免登录 session */
export function handleShopWechatLoginResult(result: WechatLoginResult): ShopSessionPayload | null {
  const session = sessionFromWechatLogin(result);
  if (!session) return null;
  saveWechatSession(session);
  return session;
}

/** @deprecated 使用 handleShopWechatLoginResult */
export function saveShopWechatAuth(result: WechatLoginResult): boolean {
  return !!handleShopWechatLoginResult(result);
}

export async function handleShopWechatCallback(): Promise<WechatLoginResult | null> {
  if (!isWechatEnv()) return null;
  const config = await fetchClientConfig();
  if (!isWxAuthorizeEnabled(config)) return null;
  return weixinSdk.handleOAuthCallback();
}

let oauthCallbackInflight: Promise<WechatLoginResult | null> | null = null;

/** 全局单例：避免 Context 与页面 effect 重复消费 OAuth code */
export async function handleShopWechatCallbackOnce(): Promise<WechatLoginResult | null> {
  if (!isWechatEnv()) return null;
  const params = new URLSearchParams(window.location.search);
  if (!params.get('code')) return null;
  if (oauthCallbackInflight) return oauthCallbackInflight;
  oauthCallbackInflight = handleShopWechatCallback().finally(() => {
    oauthCallbackInflight = null;
  });
  return oauthCallbackInflight;
}

/**
 * 微信一键登录（已绑定微信的门店账号免验证码）。
 * 返回 session = 已登录；void = 已跳转授权页等待回调。
 */
export async function loginShopWithWechat(): Promise<ShopSessionPayload | null | void> {
  const config = await fetchClientConfig();
  if (!isWxAuthorizeEnabled(config)) return null;
  if (!isWechatEnv()) {
    throw new Error(WECHAT_INAPP_REQUIRED_MSG);
  }
  markScanWarmupAfterAuth();
  const result = await weixinSdk.login();
  if (result) return handleShopWechatLoginResult(result);
}

/** 短信登录成功后于微信内自动发起 OAuth，绑定 openId 便于后续免登 */
export async function bindShopWechatAfterSmsLogin(session?: ShopSessionPayload): Promise<'skipped' | void> {
  const config = await fetchClientConfig();
  if (!isWxAuthorizeEnabled(config)) return 'skipped';
  if (!isWechatEnv()) return 'skipped';
  // 已绑定则勿再 OAuth：每次 OAuth 回跳都会重置 iOS JSSDK 入场 URL，易导致扫码失败
  if (session?.account?.hasWechat) return 'skipped';
  markScanWarmupAfterAuth();
  await weixinSdk.login();
}

export async function authorizeShopWechat(): Promise<WechatLoginResult | void> {
  const config = await fetchClientConfig();
  if (!isWxAuthorizeEnabled(config)) return;
  if (!isWechatEnv()) {
    throw new Error(WECHAT_INAPP_REQUIRED_MSG);
  }
  markScanWarmupAfterAuth();
  return weixinSdk.login();
}