'use client';

import React, { useState } from 'react';
import { useRouter } from 'next/navigation';
import Link from 'next/link';
import { Card, CardHeader, CardTitle, CardContent } from '@/components/ui/Card';
import { Input } from '@/components/ui/Input';
import { Button } from '@/components/ui/Button';
import { useTranslation } from '@/hooks/useTranslation';
import { useCsrf } from '@/hooks/useCsrf';

export default function SignupPage() {
  const router = useRouter();
  const { t } = useTranslation();
  const { fetchWithCsrf } = useCsrf();
  const [name, setName] = useState('');
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [confirmPassword, setConfirmPassword] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');

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

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

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

    try {
      const response = await fetchWithCsrf('/api/auth/signup', {
        method: 'POST',
        body: JSON.stringify({ name, email, password }),
      });

      const data = await response.json();

      if (response.ok && data.success) {
        // Store user in localStorage for client-side
        localStorage.setItem('user', JSON.stringify(data.user));

        // Track successful signup with PostHog
        try {
          const { identifyUser, trackEvent } = await import('@/components/PostHogProvider');
          identifyUser(data.user.id, {
            email: data.user.email,
            name: data.user.name,
            plan: data.user.plan || 'FREE',
            signupMethod: 'email',
          });
          trackEvent('user_signup', {
            method: 'email',
            email: data.user.email,
          });
        } catch (error) {
          console.error('PostHog tracking error:', error);
        }

        // Redirect to dashboard
        router.push('/dashboard');
        router.refresh();
      } else {
        setError(data.error || 'Failed to create account');
      }
    } catch (err) {
      setError('An error occurred. Please try again.');
    } finally {
      setLoading(false);
    }
  };

  const handleGoogleSignIn = () => {
    // Redirect to Google OAuth API route
    window.location.href = '/api/auth/google';
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-primary-50 to-white flex items-center justify-center p-4">
      <div className="w-full max-w-md">
        <div className="text-center mb-8">
          <Link href="/" className="inline-flex items-center space-x-2 mb-6">
            <img src="/logo.svg" alt="QR Master" className="w-10 h-10" />
            <span className="text-2xl font-bold text-gray-900">QR Master</span>
          </Link>
          <h1 className="text-3xl font-bold text-gray-900">Create Account</h1>
          <p className="text-gray-600 mt-2">Start creating QR codes in seconds</p>
          <Link href="/" className="text-sm text-primary-600 hover:text-primary-700 font-medium mt-2 inline-block border border-primary-600 hover:border-primary-700 px-4 py-2 rounded-lg transition-colors">
            ← Back to Home
          </Link>
        </div>

        <Card>
          <CardContent className="p-6">
            <form onSubmit={handleSubmit} className="space-y-4">
              {error && (
                <div className="bg-red-50 text-red-600 p-3 rounded-lg text-sm">
                  {error}
                </div>
              )}

              <Input
                label="Full Name"
                type="text"
                value={name}
                onChange={(e) => setName(e.target.value)}
                placeholder="John Doe"
                required
              />

              <Input
                label="Email"
                type="email"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                placeholder="you@example.com"
                required
              />

              <Input
                label="Password"
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                placeholder="••••••••"
                required
              />

              <Input
                label="Confirm Password"
                type="password"
                value={confirmPassword}
                onChange={(e) => setConfirmPassword(e.target.value)}
                placeholder="••••••••"
                required
              />

              <Button type="submit" className="w-full" loading={loading}>
                Create Account
              </Button>

              <div className="relative my-6">
                <div className="absolute inset-0 flex items-center">
                  <div className="w-full border-t border-gray-300"></div>
                </div>
                <div className="relative flex justify-center text-sm">
                  <span className="px-2 bg-white text-gray-500">Or continue with</span>
                </div>
              </div>

              <Button
                type="button"
                variant="outline"
                className="w-full"
                onClick={handleGoogleSignIn}
              >
                <svg className="w-5 h-5 mr-2" 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>
                Sign up with Google
              </Button>
            </form>

            <div className="mt-6 text-center">
              <p className="text-sm text-gray-600">
                Already have an account?{' '}
                <Link href="/login" className="text-primary-600 hover:text-primary-700 font-medium">
                  Sign in
                </Link>
              </p>
            </div>
          </CardContent>
        </Card>

        <p className="text-center text-sm text-gray-500 mt-6">
          By signing up, you agree to our{' '}
          <Link href="/privacy" className="text-primary-600 hover:text-primary-700">
            Privacy Policy
          </Link>
        </p>
      </div>
    </div>
  );
}