import { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import Input from '../../components/Input';
import Button from '../../components/Button';
import { authApi, errMsg } from '../../api';
import { IconLogo } from '../../components/Icons';

export default function Login() {
  const [username, setUsername] = useState('admin');
  const [password, setPassword] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');
  const navigate = useNavigate();

  const submit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!username || !password) {
      setError('请输入用户名和密码');
      return;
    }
    setLoading(true);
    setError('');
    try {
      const r = await authApi.login(username, password);
      localStorage.setItem('volunteer_admin_token', r.token);
      localStorage.setItem('volunteer_admin_username', r.username);
      navigate('/admin/activities');
    } catch (e) {
      setError(errMsg(e, '登录失败'));
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-50 px-4">
      <form onSubmit={submit} className="w-full max-w-md bg-white border-2 border-black p-6 md:p-8">
        <div className="text-center mb-6 flex flex-col items-center">
          <div className="mb-2 text-black"><IconLogo size={48} /></div>
          <h1 className="text-2xl font-black tracking-wide">义工时长管理系统</h1>
          <p className="text-gray-500 text-sm mt-1">管理台登录</p>
        </div>

        <div className="space-y-4">
          <div>
            <label className="block text-sm font-bold mb-1.5">用户名</label>
            <Input value={username} onChange={(e) => setUsername(e.target.value)} autoFocus />
          </div>
          <div>
            <label className="block text-sm font-bold mb-1.5">密码</label>
            <Input type="password" value={password} onChange={(e) => setPassword(e.target.value)} />
          </div>
          {error && <div className="text-sm text-red-600">{error}</div>}
          <Button type="submit" size="lg" className="w-full" disabled={loading}>
            {loading ? '登录中...' : '登 录'}
          </Button>
        </div>

        <div className="mt-6 text-center text-sm text-gray-500">
          <p>默认账号：admin / admin123</p>
          <a href="/u" className="inline-block mt-2 underline underline-offset-2 hover:text-black">← 返回用户端</a>
        </div>
      </form>
    </div>
  );
}