import { useState, useEffect } from 'react';
import { Server, Eye, EyeOff } from 'lucide-react';
import { getTheme } from '../themes';
import { API_URL } from '../config';
import axios from 'axios';

export default function Auth({ onLogin }) {
  const [isLogin, setIsLogin] = useState(true);
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [showPassword, setShowPassword] = useState(false);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');
  const [theme] = useState(localStorage.getItem('theme') || 'modern');
  const [oidcProviders, setOidcProviders] = useState({});

  const currentTheme = getTheme(theme);

  useEffect(() => {
    loadOidcProviders();
  }, []);

  const loadOidcProviders = async () => {
    try {
      const { data } = await axios.get(`${API_URL}/api/auth/oidc/providers`);
      setOidcProviders(data);
    } catch (error) {
      console.error('Ошибка загрузки OIDC провайдеров:', error);
    }
  };

  const handleOidcLogin = (provider) => {
    window.location.href = `${API_URL}/api/auth/oidc/${provider}/login`;
  };

  const handleSubmit = async (e) => {
    e.preventDefault();
    setError('');
    setLoading(true);

    try {
      await onLogin(username, password, isLogin);
    } catch (err) {
      setError(err.message || 'Ошибка авторизации');
    } finally {
      setLoading(false);
    }
  };

  return (
    <div className={`min-h-screen ${currentTheme.primary} flex items-center justify-center p-4 transition-colors duration-300`}>
      <div className="w-full max-w-md">
        {/* Logo */}
        <div className="text-center mb-8">
          <div className={`${currentTheme.accent} w-16 h-16 rounded-2xl flex items-center justify-center mx-auto mb-4 shadow-lg`}>
            <Server className="w-10 h-10 text-white" />
          </div>
          <h1 className={`text-3xl font-bold bg-gradient-to-r ${currentTheme.gradient} bg-clip-text text-transparent mb-2`}>MC Panel</h1>
          <p className={`${currentTheme.textSecondary}`}>Панель управления Minecraft серверами</p>
        </div>

        {/* Form Card */}
        <div className={`${currentTheme.secondary} rounded-2xl shadow-2xl ${currentTheme.border} border p-8`}>
          {/* Tabs */}
          <div className="flex gap-2 mb-6">
            <button
              onClick={() => setIsLogin(true)}
              className={`flex-1 py-3 rounded-xl font-medium transition-all duration-200 ${
                isLogin
                  ? `${currentTheme.accent} text-white shadow-lg`
                  : `${currentTheme.card} ${currentTheme.text} ${currentTheme.hover}`
              }`}
            >
              Вход
            </button>
            <button
              onClick={() => setIsLogin(false)}
              className={`flex-1 py-3 rounded-xl font-medium transition-all duration-200 ${
                !isLogin
                  ? `${currentTheme.accent} text-white shadow-lg`
                  : `${currentTheme.card} ${currentTheme.text} ${currentTheme.hover}`
              }`}
            >
              Регистрация
            </button>
          </div>

          <form onSubmit={handleSubmit} className="space-y-5">
            {/* Username */}
            <div>
              <label className={`block text-sm font-medium ${currentTheme.text} mb-2`}>
                Имя пользователя
              </label>
              <input
                type="text"
                value={username}
                onChange={(e) => setUsername(e.target.value)}
                required
                className={`w-full ${currentTheme.input} ${currentTheme.border} border rounded-xl px-4 py-3 ${currentTheme.text} focus:outline-none focus:ring-2 focus:ring-blue-500 transition`}
                placeholder="admin"
              />
            </div>

            {/* Password */}
            <div>
              <label className={`block text-sm font-medium ${currentTheme.text} mb-2`}>
                Пароль
              </label>
              <div className="relative">
                <input
                  type={showPassword ? 'text' : 'password'}
                  value={password}
                  onChange={(e) => setPassword(e.target.value)}
                  required
                  className={`w-full ${currentTheme.input} ${currentTheme.border} border rounded-xl px-4 py-3 pr-12 ${currentTheme.text} focus:outline-none focus:ring-2 focus:ring-blue-500 transition`}
                  placeholder="••••••••"
                />
                <button
                  type="button"
                  onClick={() => setShowPassword(!showPassword)}
                  className={`absolute right-3 top-1/2 -translate-y-1/2 ${currentTheme.textSecondary} hover:${currentTheme.text} transition`}
                >
                  {showPassword ? <EyeOff className="w-5 h-5" /> : <Eye className="w-5 h-5" />}
                </button>
              </div>
            </div>

            {/* Error */}
            {error && (
              <div className="bg-red-500 bg-opacity-10 border border-red-500 rounded-xl p-3 text-red-400 text-sm">
                {error}
              </div>
            )}

            {/* Submit Button */}
            <button
              type="submit"
              disabled={loading}
              className={`w-full ${currentTheme.accent} ${currentTheme.accentHover} text-white py-3 rounded-xl font-medium disabled:opacity-50 disabled:cursor-not-allowed transition-all duration-200 shadow-lg hover:shadow-xl`}
            >
              {loading ? (
                <span className="flex items-center justify-center gap-2">
                  <div className="w-5 h-5 border-2 border-white border-t-transparent rounded-full animate-spin" />
                  Загрузка...
                </span>
              ) : (
                isLogin ? 'Войти' : 'Зарегистрироваться'
              )}
            </button>
          </form>

          {/* OpenID Connect Providers */}
          {Object.keys(oidcProviders).length > 0 && (
            <div className="mt-6">
              <div className="relative">
                <div className="absolute inset-0 flex items-center">
                  <div className={`w-full border-t ${currentTheme.border}`} />
                </div>
                <div className="relative flex justify-center text-sm">
                  <span className={`${currentTheme.secondary} px-2 ${currentTheme.textSecondary}`}>
                    Или войдите через
                  </span>
                </div>
              </div>

              <div className="mt-6 grid gap-3">
                {Object.entries(oidcProviders).map(([providerId, provider]) => (
                  <button
                    key={providerId}
                    onClick={() => handleOidcLogin(providerId)}
                    className={`w-full flex justify-center items-center px-4 py-3 border border-transparent rounded-xl text-sm font-medium text-white ${provider.color} transition-colors duration-200 shadow-sm hover:shadow-md`}
                  >
                    <span className="mr-2 text-lg">{provider.icon}</span>
                    Войти через {provider.name}
                  </button>
                ))}
              </div>
            </div>
          )}

          {/* Default Credentials */}
          {isLogin && (
            <div className={`mt-6 text-center text-sm ${currentTheme.textSecondary}`}>
              <p>Учётные данные по умолчанию:</p>
              <p className={`${currentTheme.text} font-mono mt-1`}>none / none</p>
            </div>
          )}
        </div>

        {/* Footer */}
        <div className={`text-center mt-6 text-sm ${currentTheme.textSecondary}`}>
          <p>© 2026 MC Panel. Все права защищены.</p>
        </div>
      </div>
    </div>
  );
}