import { useState } from 'react';
import { useRouter } from 'next/router';
import Link from 'next/link';
import AuthLayout from '../components/AuthLayout';
import AnimatedFireLogo from '../components/AnimatedFireLogo';

export default function Signup() {
  const router = useRouter();
  const [formData, setFormData] = useState({
    email: '',
    password: '',
    confirmPassword: '',
    firstName: '',
    lastName: ''
  });
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');
  const [validationErrors, setValidationErrors] = useState({});

  const handleInputChange = (field, value) => {
    setFormData(prev => ({
      ...prev,
      [field]: value
    }));
    // Clear errors when user starts typing
    if (error) setError('');
    if (validationErrors[field]) {
      setValidationErrors(prev => ({
        ...prev,
        [field]: ''
      }));
    }
  };

  const validateForm = () => {
    const errors = {};

    // Email validation
    if (!formData.email) {
      errors.email = 'Email is required';
    } else if (!/\S+@\S+\.\S+/.test(formData.email)) {
      errors.email = 'Please enter a valid email address';
    }

    // Password validation
    if (!formData.password) {
      errors.password = 'Password is required';
    } else if (formData.password.length < 6) {
      errors.password = 'Password must be at least 6 characters';
    }

    // Confirm password validation
    if (!formData.confirmPassword) {
      errors.confirmPassword = 'Please confirm your password';
    } else if (formData.password !== formData.confirmPassword) {
      errors.confirmPassword = 'Passwords do not match';
    }

    // Name validation
    if (!formData.firstName.trim()) {
      errors.firstName = 'First name is required';
    }

    if (!formData.lastName.trim()) {
      errors.lastName = 'Last name is required';
    }

    setValidationErrors(errors);
    return Object.keys(errors).length === 0;
  };

  const handleSubmit = async (e) => {
    e.preventDefault();
    
    if (!validateForm()) {
      return;
    }

    setLoading(true);
    setError('');

    try {
      const response = await fetch('/api/auth/register', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          email: formData.email,
          password: formData.password,
          firstName: formData.firstName,
          lastName: formData.lastName
        })
      });

      const data = await response.json();

      if (response.ok) {
        // Store the JWT token in localStorage
        localStorage.setItem('auth_token', data.token);
        
        // Redirect to dashboard
        router.push('/dashboard');
      } else {
        setError(data.error || 'Registration failed');
      }
    } catch (error) {
      console.error('Registration error:', error);
      setError('Network error. Please try again.');
    } finally {
      setLoading(false);
    }
  };

  return (
    <AuthLayout>
      <div className="min-h-screen flex items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
        <div className="max-w-md w-full space-y-8">
          <div>
            <div className="text-center">
              <div className="mb-6 flex justify-center">
                <AnimatedFireLogo size={100} />
              </div>
              <h2 className="text-3xl font-bold gradient-text-flame mb-2">
                Join Deck Hearth
              </h2>
              <p className="mt-2 text-sm" style={{ color: 'var(--text-secondary)' }}>
                Create your account to start building your collection
              </p>
            </div>
          </div>

          <div 
            className="p-8 rounded-2xl shadow-2xl backdrop-blur-sm border border-opacity-20" 
            style={{ 
              backgroundColor: 'rgba(var(--bg-secondary-rgb), 0.85)',
              borderColor: 'var(--border)'
            }}
          >
            <form onSubmit={handleSubmit} className="space-y-6">
              {error && (
                <div className="p-4 rounded-lg bg-red-500 bg-opacity-10 border border-red-500 border-opacity-20 backdrop-blur-sm">
                  <p className="text-red-400 text-sm">{error}</p>
                </div>
              )}

              <div className="grid grid-cols-2 gap-4">
                <div>
                  <label htmlFor="firstName" className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                    First Name
                  </label>
                  <input
                    id="firstName"
                    name="firstName"
                    type="text"
                    required
                    value={formData.firstName}
                    onChange={(e) => handleInputChange('firstName', e.target.value)}
                    className="w-full px-4 py-3 rounded-lg border transition-all duration-200 focus:ring-2 focus:ring-orange-500 focus:border-transparent backdrop-blur-sm"
                    style={{
                      backgroundColor: 'rgba(var(--bg-primary-rgb), 0.7)',
                      borderColor: validationErrors.firstName ? '#ef4444' : 'var(--border)',
                      color: 'var(--text-primary)'
                    }}
                    placeholder="John"
                  />
                  {validationErrors.firstName && (
                    <p className="mt-1 text-xs text-red-400">{validationErrors.firstName}</p>
                  )}
                </div>

                <div>
                  <label htmlFor="lastName" className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                    Last Name
                  </label>
                  <input
                    id="lastName"
                    name="lastName"
                    type="text"
                    required
                    value={formData.lastName}
                    onChange={(e) => handleInputChange('lastName', e.target.value)}
                    className="w-full px-4 py-3 rounded-lg border transition-all duration-200 focus:ring-2 focus:ring-orange-500 focus:border-transparent backdrop-blur-sm"
                    style={{
                      backgroundColor: 'rgba(var(--bg-primary-rgb), 0.7)',
                      borderColor: validationErrors.lastName ? '#ef4444' : 'var(--border)',
                      color: 'var(--text-primary)'
                    }}
                    placeholder="Doe"
                  />
                  {validationErrors.lastName && (
                    <p className="mt-1 text-xs text-red-400">{validationErrors.lastName}</p>
                  )}
                </div>
              </div>

              <div>
                <label htmlFor="email" className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                  Email Address
                </label>
                <input
                  id="email"
                  name="email"
                  type="email"
                  autoComplete="email"
                  required
                  value={formData.email}
                  onChange={(e) => handleInputChange('email', e.target.value)}
                  className="w-full px-4 py-3 rounded-lg border transition-all duration-200 focus:ring-2 focus:ring-orange-500 focus:border-transparent backdrop-blur-sm"
                  style={{
                    backgroundColor: 'rgba(var(--bg-primary-rgb), 0.7)',
                    borderColor: validationErrors.email ? '#ef4444' : 'var(--border)',
                    color: 'var(--text-primary)'
                  }}
                  placeholder="john@example.com"
                />
                {validationErrors.email && (
                  <p className="mt-1 text-xs text-red-400">{validationErrors.email}</p>
                )}
              </div>

              <div>
                <label htmlFor="password" className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                  Password
                </label>
                <input
                  id="password"
                  name="password"
                  type="password"
                  autoComplete="new-password"
                  required
                  value={formData.password}
                  onChange={(e) => handleInputChange('password', e.target.value)}
                  className="w-full px-4 py-3 rounded-lg border transition-all duration-200 focus:ring-2 focus:ring-orange-500 focus:border-transparent backdrop-blur-sm"
                  style={{
                    backgroundColor: 'rgba(var(--bg-primary-rgb), 0.7)',
                    borderColor: validationErrors.password ? '#ef4444' : 'var(--border)',
                    color: 'var(--text-primary)'
                  }}
                  placeholder="At least 6 characters"
                />
                {validationErrors.password && (
                  <p className="mt-1 text-xs text-red-400">{validationErrors.password}</p>
                )}
              </div>

              <div>
                <label htmlFor="confirmPassword" className="block text-sm font-medium mb-2" style={{ color: 'var(--text-primary)' }}>
                  Confirm Password
                </label>
                <input
                  id="confirmPassword"
                  name="confirmPassword"
                  type="password"
                  autoComplete="new-password"
                  required
                  value={formData.confirmPassword}
                  onChange={(e) => handleInputChange('confirmPassword', e.target.value)}
                  className="w-full px-4 py-3 rounded-lg border transition-all duration-200 focus:ring-2 focus:ring-orange-500 focus:border-transparent backdrop-blur-sm"
                  style={{
                    backgroundColor: 'rgba(var(--bg-primary-rgb), 0.7)',
                    borderColor: validationErrors.confirmPassword ? '#ef4444' : 'var(--border)',
                    color: 'var(--text-primary)'
                  }}
                  placeholder="Confirm your password"
                />
                {validationErrors.confirmPassword && (
                  <p className="mt-1 text-xs text-red-400">{validationErrors.confirmPassword}</p>
                )}
              </div>

              <div>
                <button
                  type="submit"
                  disabled={loading}
                  className={`w-full px-4 py-3 rounded-lg font-medium transition-all duration-200 ${
                    loading 
                      ? 'opacity-50 cursor-not-allowed' 
                      : 'gradient-bg-ember text-white hover:shadow-xl transform hover:scale-105 hover:shadow-orange-500/20'
                  }`}
                >
                  {loading ? (
                    <div className="flex items-center justify-center">
                      <div className="animate-spin rounded-full h-5 w-5 border-b-2 border-white mr-2"></div>
                      Creating Account...
                    </div>
                  ) : (
                    'Create Account'
                  )}
                </button>
              </div>

              <div className="text-center">
                <p className="text-sm" style={{ color: 'var(--text-secondary)' }}>
                  Already have an account?{' '}
                  <Link href="/login" className="font-medium gradient-text-flame hover:underline">
                    Sign in here
                  </Link>
                </p>
              </div>
            </form>
          </div>
        </div>
      </div>
    </AuthLayout>
  );
}