import { useEffect, useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { adminApi, clientApi, type CaptchaResponse } from '@/api/adminApi';
import { consumeSessionRecovery, markUserActivity, readSessionRecovery, writeSession, type Portal } from '@/api/session';
import { Button, Input, Modal } from '@/components/ui';

type LoginPageProps = {
  portal: Portal;
};

function loginErrorMessage(err: unknown) {
  const message = err instanceof Error ? err.message : '';
  if (message.includes('Invalid login or password')) return '用户名或密码错误';
  if (message.includes('login and password are required')) return '请输入用户名和密码';
  if (message.includes('Captcha expired')) return '验证码已过期，请刷新后重试';
  if (message.includes('Captcha is incorrect')) return '验证码错误，请重新输入';
  if (message.includes('User is locked')) return '账号已锁定，请 24 小时后再试';
  if (message.includes('User is disabled or deleted')) return '账号已停用或已删除';
  if (message.includes('Only platform admins can login to admin portal')) return '该账号不是运营端管理员';
  if (message.includes('Only enterprise admins linked to a tenant can login to client portal')) return '该账号不是已绑定企业的客户端管理员';
  return message || '登录失败，请检查账号信息后重试';
}

export function LoginPage({ portal }: LoginPageProps) {
  const navigate = useNavigate();
  const [login, setLogin] = useState('');
  const [password, setPassword] = useState('');
  const [captchaText, setCaptchaText] = useState('');
  const [captcha, setCaptcha] = useState<CaptchaResponse | null>(null);
  const [error, setError] = useState('');
  const [alertMessage, setAlertMessage] = useState('');
  const [loading, setLoading] = useState(false);
  const isAdmin = portal === 'admin';
  const recovery = readSessionRecovery(portal);

  async function refreshCaptcha(options: { clearError?: boolean } = {}) {
    if (options.clearError ?? true) {
      setError('');
    }
    setCaptchaText('');
    setCaptcha(await (isAdmin ? adminApi.getCaptcha() : clientApi.getCaptcha()));
  }

  useEffect(() => {
    void refreshCaptcha();
  }, [portal]);

  async function submit() {
    if (!captcha) return;
    setLoading(true);
    setError('');
    try {
      const session = await (isAdmin ? adminApi.login : clientApi.login)({
        login,
        password,
        captchaId: captcha.captchaId,
        captchaText,
      });
      writeSession(session);
      // A login can happen without a full page reload after the previous session
      // expired. Reset the in-memory activity clock so the new session is not
      // immediately locked using the previous session's stale idle duration.
      markUserActivity();
      const target = consumeSessionRecovery(portal)?.returnUrl;
      navigate(target ?? (isAdmin ? '/admin' : '/client'), { replace: true });
    } catch (err) {
      const message = loginErrorMessage(err);
      setError(message);
      setAlertMessage(message);
      await refreshCaptcha({ clearError: false });
    } finally {
      setLoading(false);
    }
  }

  return (
    <main className="login-page">
      <section className="login-panel">
        <div className="login-brand">
          <img alt={isAdmin ? 'CMPP 运营端 logo' : 'CMPP 客户端 logo'} src="/logo/logo1.png" />
          <div>
            <h1>短信服务平台</h1>
            <p>{isAdmin ? '运营端登录' : '客户端登录'}</p>
          </div>
        </div>
        <div className="login-form">
          {recovery ? (
            <p className="login-session-notice" role="status">
              {recovery.message ?? '登录会话已失效，请重新登录。'} 登录成功后将返回之前访问的页面。
            </p>
          ) : null}
          <Input label="用户名/登录账号" onChange={(event) => setLogin(event.target.value)} placeholder="请输入用户名、邮箱或手机号" value={login} />
          <Input label="密码" onChange={(event) => setPassword(event.target.value)} placeholder="请输入密码" type="password" value={password} />
          <div className="login-captcha-row">
            <Input label="图形验证码" onChange={(event) => setCaptchaText(event.target.value)} placeholder="请输入计算结果" value={captchaText} />
            <button className="login-captcha" onClick={() => void refreshCaptcha()} type="button">
              {captcha?.challenge ?? '刷新'}
            </button>
          </div>
          {error ? <p className="login-error">{error}</p> : null}
          <Button disabled={loading} onClick={submit}>{loading ? '登录中...' : '登录'}</Button>
        </div>
      </section>
      <Modal
        footer={<Button onClick={() => setAlertMessage('')}>知道了</Button>}
        onClose={() => setAlertMessage('')}
        open={Boolean(alertMessage)}
        title="登录失败"
      >
        <p className="login-alert-message">{alertMessage}</p>
      </Modal>
    </main>
  );
}