import { ref, computed } from 'vue';
import { fetchEnterpriseInfo, fetchEnterpriseLogin, type EnterpriseInfo } from '@/network/api/enterprise';

const TEMP_HISTORY_KEY = 'ba_temp_chat_history';
const AUTH_HISTORY_KEY = 'ba_chat_history';
const AUTH_CURRENT_SESSION_KEY = 'ba_current_session_id';
const ENTERPRISE_INFO_KEY = 'ba_enterprise_info';
const AUTH_TOKEN_KEY = 'ba_auth_token';

export const enterpriseInfo = ref<EnterpriseInfo | null>(null);
const authLoading = ref(false);
const authError = ref(false);

// Global fetch interceptor: any 401 response → clear enterprise info (logout)
(function setupFetchInterceptor() {
  if (typeof window === 'undefined') return;
  const originalFetch = window.fetch.bind(window);
  window.fetch = async (...args: Parameters<typeof fetch>) => {
    const response = await originalFetch(...args);
    if (response.status === 401 && enterpriseInfo.value) {
      enterpriseInfo.value = null;
      globalThis.authToken = undefined;
      globalThis.token = undefined;
      localStorage.removeItem(ENTERPRISE_INFO_KEY);
      localStorage.removeItem(AUTH_TOKEN_KEY);
    }
    return response;
  };
})();

export function getQueryParamUniversal(key: string): string | null {
  const searchParams = new URLSearchParams(window.location.search);
  if (searchParams.has(key)) {
    return searchParams.get(key);
  }

  const hash = window.location.hash;
  const queryIndex = hash.indexOf('?');
  if (queryIndex !== -1) {
    const hashQuery = hash.substring(queryIndex + 1);
    const hashParams = new URLSearchParams(hashQuery);
    return hashParams.get(key);
  }

  return null;
}

export function getChatHistoryStorageKey(): string {
  return enterpriseInfo.value ? AUTH_HISTORY_KEY : TEMP_HISTORY_KEY;
}

export function getCurrentSessionStorageKey(): string {
  return AUTH_CURRENT_SESSION_KEY;
}

export function useEnterpriseAuth() {
  const isLoggedIn = computed(() => !!enterpriseInfo.value);
  const enterpriseName = computed(() => enterpriseInfo.value?.name || '');
  const creditCode = computed(() => enterpriseInfo.value?.credit_code || '');

  const initAuth = async () => {
    const creditCodeParam = getQueryParamUniversal('credit_code');
    const accessToken = getQueryParamUniversal('access_token');

    // 跟随 querystring 的 policyMode：A/B 测试变体（如 zhaoshang_staging_1）也需体现在 source 中
    globalThis.source = globalThis.policyMode || "zhaoshang";

    // 1. access_token 存在: 换取 credit_code + authToken, 再拉企业信息
    // （要企业态就显式带 ?access_token=<token> 或 ?credit_code=<代码>）
    if (accessToken && !creditCodeParam) {
      authLoading.value = true;
      authError.value = false;

      try {
        const loginResult = await fetchEnterpriseLogin(accessToken);
        if (loginResult) {
          globalThis.authToken = loginResult.authToken;
          globalThis.token = loginResult.authToken;
          localStorage.setItem(AUTH_TOKEN_KEY, loginResult.authToken);

          authLoading.value = false;
          return await initAuthWithCreditCode(loginResult.creditCode);
        }
      } catch {
        authError.value = true;
      } finally {
        authLoading.value = false;
      }

      return;
    }

    // 2. credit_code 存在: 直接拉企业信息
    if (creditCodeParam) {
      return await initAuthWithCreditCode(creditCodeParam);
    }

    // 3. 无参数: 保持未登录状态
  };

  const initAuthWithCreditCode = async (creditCodeParam: string) => {
    authLoading.value = true;
    authError.value = false;

    try {
      const info = await fetchEnterpriseInfo(creditCodeParam);
      if (info) {
        enterpriseInfo.value = info;
        const cc = info.credit_code || creditCodeParam;
        (globalThis as any).credit_code = cc;
        (globalThis as any).transmission = {
          ...((globalThis as any).transmission || {}),
          credit_code: cc,
        };
        localStorage.setItem(ENTERPRISE_INFO_KEY, JSON.stringify(info));
      }
    } catch {
      authError.value = true;
    } finally {
      authLoading.value = false;
    }
  };

  const logout = () => {
    enterpriseInfo.value = null;
    globalThis.authToken = undefined;
    globalThis.token = undefined;
    localStorage.removeItem(ENTERPRISE_INFO_KEY);
    localStorage.removeItem(AUTH_TOKEN_KEY);
  };

  const redirectToLogin = () => {
    // 回跳到本页；一网通办 redirect_uri 白名单后续自行对接
    const mode = globalThis.policyMode || "zhaoshang";
    const currentUrl = `${window.location.origin}${window.location.pathname}#/?mode=${mode}`;
    const sourceLink = `https://zwdtuser.sh.gov.cn/uc/login/login.jsp?sendPost=false&type=2&redirect_uri=${encodeURIComponent(currentUrl)}`;
    window.location.href = sourceLink;
  };

  return {
    isLoggedIn,
    enterpriseName,
    creditCode,
    enterpriseInfo,
    authLoading,
    authError,
    initAuth,
    logout,
    redirectToLogin,
  };
}