'use client';

import React, { useState } from 'react';
import { useRouter, useSearchParams } 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';
import { appendRedirectParam, sanitizeRedirectPath } from '@/lib/auth-flow';

export default function SignupClient() {
    const router = useRouter();
    const searchParams = useSearchParams();
    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 [showPassword, setShowPassword] = useState(false);
    const [showConfirmPassword, setShowConfirmPassword] = useState(false);
    const redirectTarget = sanitizeRedirectPath(searchParams.get('redirect'));

    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 onboarding
                router.push(appendRedirectParam('/onboarding', redirectTarget));
                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 = appendRedirectParam('/api/auth/google', redirectTarget);
    };

    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="/favicon1.png" alt="QR Master" className="w-10 h-10 rounded-full object-cover" />
                        <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
                            />

                            <div className="space-y-1">
                                <label htmlFor="password" className="block text-sm font-medium text-gray-700">Password</label>
                                <div className="relative">
                                    <input
                                        id="password"
                                        type={showPassword ? 'text' : 'password'}
                                        value={password}
                                        onChange={(e) => setPassword(e.target.value)}
                                        placeholder="••••••••"
                                        required
                                        className="flex h-10 w-full rounded-lg border border-gray-300 bg-white px-3 py-2 pr-10 text-sm placeholder:text-gray-500 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2"
                                    />
                                    <button
                                        type="button"
                                        onClick={() => setShowPassword(!showPassword)}
                                        className="absolute inset-y-0 right-0 flex items-center pr-3 text-gray-400 hover:text-gray-600"
                                        tabIndex={-1}
                                    >
                                        {showPassword ? (
                                            <svg xmlns="http://www.w3.org/2000/svg" className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13.875 18.825A10.05 10.05 0 0112 19c-4.478 0-8.268-2.943-9.543-7a9.97 9.97 0 011.563-3.029m5.858.908a3 3 0 114.243 4.243M9.878 9.878l4.242 4.242M9.88 9.88l-3.29-3.29m7.532 7.532l3.29 3.29M3 3l3.59 3.59m0 0A9.953 9.953 0 0112 5c4.478 0 8.268 2.943 9.543 7a10.025 10.025 0 01-4.132 5.411m0 0L21 21" />
                                            </svg>
                                        ) : (
                                            <svg xmlns="http://www.w3.org/2000/svg" className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
                                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z" />
                                            </svg>
                                        )}
                                    </button>
                                </div>
                            </div>

                            <div className="space-y-1">
                                <label htmlFor="confirm-password" className="block text-sm font-medium text-gray-700">Confirm Password</label>
                                <div className="relative">
                                    <input
                                        id="confirm-password"
                                        type={showConfirmPassword ? 'text' : 'password'}
                                        value={confirmPassword}
                                        onChange={(e) => setConfirmPassword(e.target.value)}
                                        placeholder="••••••••"
                                        required
                                        className="flex h-10 w-full rounded-lg border border-gray-300 bg-white px-3 py-2 pr-10 text-sm placeholder:text-gray-500 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2"
                                    />
                                    <button
                                        type="button"
                                        onClick={() => setShowConfirmPassword(!showConfirmPassword)}
                                        className="absolute inset-y-0 right-0 flex items-center pr-3 text-gray-400 hover:text-gray-600"
                                        tabIndex={-1}
                                    >
                                        {showConfirmPassword ? (
                                            <svg xmlns="http://www.w3.org/2000/svg" className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13.875 18.825A10.05 10.05 0 0112 19c-4.478 0-8.268-2.943-9.543-7a9.97 9.97 0 011.563-3.029m5.858.908a3 3 0 114.243 4.243M9.878 9.878l4.242 4.242M9.88 9.88l-3.29-3.29m7.532 7.532l3.29 3.29M3 3l3.59 3.59m0 0A9.953 9.953 0 0112 5c4.478 0 8.268 2.943 9.543 7a10.025 10.025 0 01-4.132 5.411m0 0L21 21" />
                                            </svg>
                                        ) : (
                                            <svg xmlns="http://www.w3.org/2000/svg" className="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
                                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M2.458 12C3.732 7.943 7.523 5 12 5c4.478 0 8.268 2.943 9.542 7-1.274 4.057-5.064 7-9.542 7-4.477 0-8.268-2.943-9.542-7z" />
                                            </svg>
                                        )}
                                    </button>
                                </div>
                            </div>

                            <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={appendRedirectParam('/login', redirectTarget)} 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>
    );
}