import { useState, useEffect } from 'react';
import { auth } from '../utils/api';
import ErrorMessage from './ErrorMessage';

export default function Login() {
  const [providers, setProviders] = useState({
    google: false,
    discord: false,
    local: false,
  });
  const [showRegister, setShowRegister] = useState(false);
  const [email, setEmail] = useState('');
  const [name, setName] = useState('');
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [error, setError] = useState('');
  const [loading, setLoading] = useState(false);

  useEffect(() => {
    checkAuthProviders();
    // Check for registration disabled error in URL
    const urlParams = new URLSearchParams(window.location.search);
    if (urlParams.get('error') === 'registration_disabled') {
      setError('Registration is currently disabled. Please contact an administrator.');
    }
  }, []);

  const checkAuthProviders = async () => {
    try {
      const result = await auth.getProviders();
      setProviders({
        google: result.google || false,
        discord: result.discord || false,
        local: result.local || false,
      });
    } catch (error) {
      // If endpoint fails, assume no providers are available
      console.error('Failed to check auth providers:', error);
      setProviders({ google: false, discord: false, local: false });
    }
  };

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

    try {
      await auth.localLogin(username, password);
      // Reload page to trigger auth check in App component
      window.location.reload();
    } catch (err) {
      setError(err.message || 'Login failed');
      setLoading(false);
    }
  };

  const handleLocalRegister = async (e) => {
    e.preventDefault();
    setError('');

    if (password !== confirmPassword) {
      setError('Passwords do not match');
      return;
    }

    if (password.length < 8) {
      setError('Password must be at least 8 characters long');
      return;
    }

    setLoading(true);

    try {
      await auth.localRegister(email, name, password);
      // Reload page to trigger auth check in App component
      window.location.reload();
    } catch (err) {
      setError(err.message || 'Registration failed');
      setLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-900">
      <div className="bg-gray-800 rounded-2xl shadow-2xl p-8 w-full max-w-md border border-gray-700">
        <div className="text-center mb-8">
          <h1 className="text-4xl font-bold text-transparent bg-clip-text bg-gradient-to-r from-orange-500 to-amber-500 mb-2">
            JiggaBlend
          </h1>
          <p className="text-gray-400 text-lg">Blender Render Farm</p>
        </div>
        
        <div className="space-y-4">
          <ErrorMessage error={error} className="text-sm" />
          {providers.local && (
            <div className="pb-4 border-b border-gray-700">
              <div className="flex gap-2 mb-4">
                <button
                  type="button"
                  onClick={() => {
                    setShowRegister(false);
                    setError('');
                  }}
                  className={`flex-1 py-2 px-4 rounded-lg font-medium transition-colors ${
                    !showRegister
                      ? 'bg-orange-600 text-white'
                      : 'bg-gray-700 text-gray-300 hover:bg-gray-600'
                  }`}
                >
                  Login
                </button>
                <button
                  type="button"
                  onClick={() => {
                    setShowRegister(true);
                    setError('');
                  }}
                  className={`flex-1 py-2 px-4 rounded-lg font-medium transition-colors ${
                    showRegister
                      ? 'bg-orange-600 text-white'
                      : 'bg-gray-700 text-gray-300 hover:bg-gray-600'
                  }`}
                >
                  Register
                </button>
              </div>

              {!showRegister ? (
                <form onSubmit={handleLocalLogin} className="space-y-4">
                  <div>
                    <label htmlFor="username" className="block text-sm font-medium text-gray-300 mb-1">
                      Email
                    </label>
                    <input
                      id="username"
                      type="email"
                      value={username}
                      onChange={(e) => setUsername(e.target.value)}
                      required
                      className="w-full px-4 py-2 bg-gray-900 border border-gray-600 rounded-lg text-gray-100 focus:ring-2 focus:ring-orange-500 focus:border-transparent placeholder-gray-500"
                      placeholder="Enter your email"
                    />
                  </div>
                  <div>
                    <label htmlFor="password" className="block text-sm font-medium text-gray-300 mb-1">
                      Password
                    </label>
                    <input
                      id="password"
                      type="password"
                      value={password}
                      onChange={(e) => setPassword(e.target.value)}
                      required
                      className="w-full px-4 py-2 bg-gray-900 border border-gray-600 rounded-lg text-gray-100 focus:ring-2 focus:ring-orange-500 focus:border-transparent placeholder-gray-500"
                      placeholder="Enter password"
                    />
                  </div>
                  <button
                    type="submit"
                    disabled={loading}
                    className="w-full bg-orange-600 text-white font-semibold py-3 px-6 rounded-lg hover:bg-orange-500 transition-all duration-200 shadow-lg disabled:opacity-50 disabled:cursor-not-allowed"
                  >
                    {loading ? 'Logging in...' : 'Login'}
                  </button>
                </form>
              ) : (
                <form onSubmit={handleLocalRegister} className="space-y-4">
                  <div>
                    <label htmlFor="reg-email" className="block text-sm font-medium text-gray-300 mb-1">
                      Email
                    </label>
                    <input
                      id="reg-email"
                      type="email"
                      value={email}
                      onChange={(e) => setEmail(e.target.value)}
                      required
                      className="w-full px-4 py-2 bg-gray-900 border border-gray-600 rounded-lg text-gray-100 focus:ring-2 focus:ring-orange-500 focus:border-transparent placeholder-gray-500"
                      placeholder="Enter your email"
                    />
                  </div>
                  <div>
                    <label htmlFor="reg-name" className="block text-sm font-medium text-gray-300 mb-1">
                      Name
                    </label>
                    <input
                      id="reg-name"
                      type="text"
                      value={name}
                      onChange={(e) => setName(e.target.value)}
                      required
                      className="w-full px-4 py-2 bg-gray-900 border border-gray-600 rounded-lg text-gray-100 focus:ring-2 focus:ring-orange-500 focus:border-transparent placeholder-gray-500"
                      placeholder="Enter your name"
                    />
                  </div>
                  <div>
                    <label htmlFor="reg-password" className="block text-sm font-medium text-gray-300 mb-1">
                      Password
                    </label>
                    <input
                      id="reg-password"
                      type="password"
                      value={password}
                      onChange={(e) => setPassword(e.target.value)}
                      required
                      minLength={8}
                      className="w-full px-4 py-2 bg-gray-900 border border-gray-600 rounded-lg text-gray-100 focus:ring-2 focus:ring-orange-500 focus:border-transparent placeholder-gray-500"
                      placeholder="At least 8 characters"
                    />
                  </div>
                  <div>
                    <label htmlFor="reg-confirm-password" className="block text-sm font-medium text-gray-300 mb-1">
                      Confirm Password
                    </label>
                    <input
                      id="reg-confirm-password"
                      type="password"
                      value={confirmPassword}
                      onChange={(e) => setConfirmPassword(e.target.value)}
                      required
                      minLength={8}
                      className="w-full px-4 py-2 bg-gray-900 border border-gray-600 rounded-lg text-gray-100 focus:ring-2 focus:ring-orange-500 focus:border-transparent placeholder-gray-500"
                      placeholder="Confirm password"
                    />
                  </div>
                  <button
                    type="submit"
                    disabled={loading}
                    className="w-full bg-orange-600 text-white font-semibold py-3 px-6 rounded-lg hover:bg-orange-500 transition-all duration-200 shadow-lg disabled:opacity-50 disabled:cursor-not-allowed"
                  >
                    {loading ? 'Registering...' : 'Register'}
                  </button>
                </form>
              )}
            </div>
          )}
          
          {providers.google && (
            <a
              href="/api/auth/google/login"
              className="w-full flex items-center justify-center gap-3 bg-gray-700 border-2 border-gray-600 text-gray-200 font-semibold py-3 px-6 rounded-lg hover:bg-gray-600 hover:border-gray-500 transition-all duration-200 shadow-sm"
            >
              <svg className="w-5 h-5" viewBox="0 0 24 24">
                <path fill="#4285F4" d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92c-.26 1.37-1.04 2.53-2.21 3.31v2.77h3.57c2.08-1.92 3.28-4.74 3.28-8.09z"/>
                <path fill="#34A853" d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84C3.99 20.53 7.7 23 12 23z"/>
                <path fill="#FBBC05" d="M5.84 14.09c-.22-.66-.35-1.36-.35-2.09s.13-1.43.35-2.09V7.07H2.18C1.43 8.55 1 10.22 1 12s.43 3.45 1.18 4.93l2.85-2.22.81-.62z"/>
                <path fill="#EA4335" d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1 7.7 1 3.99 3.47 2.18 7.07l3.66 2.84c.87-2.6 3.3-4.53 6.16-4.53z"/>
              </svg>
              Continue with Google
            </a>
          )}
          
          {providers.discord && (
            <a
              href="/api/auth/discord/login"
              className="w-full flex items-center justify-center gap-3 bg-[#5865F2] text-white font-semibold py-3 px-6 rounded-lg hover:bg-[#4752C4] transition-all duration-200 shadow-lg"
            >
              <svg className="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
                <path d="M20.317 4.37a19.791 19.791 0 0 0-4.885-1.515a.074.074 0 0 0-.079.037c-.21.375-.444.864-.608 1.25a18.27 18.27 0 0 0-5.487 0a12.64 12.64 0 0 0-.617-1.25a.077.077 0 0 0-.079-.037A19.736 19.736 0 0 0 3.677 4.37a.07.07 0 0 0-.032.027C.533 9.046-.32 13.58.099 18.057a.082.082 0 0 0 .031.057a19.9 19.9 0 0 0 5.993 3.03a.078.078 0 0 0 .084-.028a14.09 14.09 0 0 0 1.226-1.994a.076.076 0 0 0-.041-.106a13.107 13.107 0 0 1-1.872-.892a.077.077 0 0 1-.008-.128a10.2 10.2 0 0 0 .372-.292a.074.074 0 0 1 .077-.01c3.928 1.793 8.18 1.793 12.062 0a.074.074 0 0 1 .078.01c.12.098.246.198.373.292a.077.077 0 0 1-.006.127a12.299 12.299 0 0 1-1.873.892a.077.077 0 0 0-.041.107c.36.698.772 1.362 1.225 1.993a.076.076 0 0 0 .084.028a19.839 19.839 0 0 0 6.002-3.03a.077.077 0 0 0 .032-.054c.5-5.177-.838-9.674-3.549-13.66a.061.061 0 0 0-.031-.03zM8.02 15.33c-1.183 0-2.157-1.085-2.157-2.419c0-1.333.956-2.419 2.157-2.419c1.21 0 2.176 1.096 2.157 2.42c0 1.333-.956 2.418-2.157 2.418zm7.975 0c-1.183 0-2.157-1.085-2.157-2.419c0-1.333.955-2.419 2.157-2.419c1.21 0 2.176 1.096 2.157 2.42c0 1.333-.946 2.418-2.157 2.418z"/>
              </svg>
              Continue with Discord
            </a>
          )}
          
          {!providers.google && !providers.discord && !providers.local && (
            <div className="p-4 bg-yellow-400/20 border border-yellow-400/50 rounded-lg text-yellow-400 text-sm text-center">
              No authentication methods are configured. Please contact an administrator.
            </div>
          )}
        </div>
      </div>
    </div>
  );
}