import React, { useState } from 'react';
import { useNavigate, Link } from 'react-router-dom';
import { useAuthStore } from '../store/authStore';
import { Eye, EyeOff, ArrowRight } from 'lucide-react';

export default function Login() {
    const [email, setEmail] = useState('');
    const [password, setPassword] = useState('');
    const [emailError, setEmailError] = useState('');
    const [showPassword, setShowPassword] = useState(false);
    const { signIn, isLoading } = useAuthStore();
    const navigate = useNavigate();

    const validateEmail = (email) => {
        const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        return emailRegex.test(email);
    };

    const handleLogin = async (e) => {
        e.preventDefault();
        if (!email || !password) {
            alert('Proszę wprowadzić email i hasło.');
            return;
        }

        if (!validateEmail(email)) {
            setEmailError('Nieprawidłowy format adresu email');
            return;
        }

        try {
            await signIn(email, password);
            navigate('/');
        } catch (e) {
            alert("Błąd logowania: " + (e.response?.data?.message || e.message));
        }
    };

    if (isLoading) {
        return (
            <div className="flex items-center justify-center min-h-screen">
                <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-primary"></div>
            </div>
        );
    }

    return (
        <div className="flex items-center justify-center min-h-screen bg-gray-50 px-4">
            <div className="w-full max-w-md p-8 bg-white border border-gray-200 rounded-2xl shadow-sm">
                <div className="mb-6">
                    <h1 className="text-3xl font-bold text-gray-900 mb-2">Logowanie</h1>
                    <div className="flex items-center text-sm">
                        <span className="text-gray-500 mr-1">Nie masz jeszcze konta?</span>
                        <Link to="/registration" className="text-primary hover:underline font-medium flex items-center">
                            Załóż je tutaj!
                            <ArrowRight size={16} className="ml-1" />
                        </Link>
                    </div>
                </div>

                <form onSubmit={handleLogin} className="space-y-4">
                    <div>
                        {emailError && <p className="text-red-500 text-xs mb-1">{emailError}</p>}
                        <input
                            type="email"
                            placeholder="Email"
                            value={email}
                            onChange={(e) => {
                                setEmail(e.target.value);
                                if (e.target.value && !validateEmail(e.target.value)) {
                                    setEmailError('Nieprawidłowy format adresu email');
                                } else {
                                    setEmailError('');
                                }
                            }}
                            className={`w-full px-4 py-3 rounded-lg border ${emailError ? 'border-red-500' : 'border-gray-300'} focus:outline-none focus:ring-2 focus:ring-primary/20 focus:border-primary transition-all`}
                            required
                        />
                    </div>

                    <div className="relative">
                        <input
                            type={showPassword ? "text" : "password"}
                            placeholder="Hasło"
                            value={password}
                            onChange={(e) => setPassword(e.target.value)}
                            className="w-full px-4 py-3 rounded-lg border border-gray-300 focus:outline-none focus:ring-2 focus:ring-primary/20 focus:border-primary transition-all"
                            required
                        />
                        <button
                            type="button"
                            onClick={() => setShowPassword(!showPassword)}
                            className="absolute right-3 top-1/2 -translate-y-1/2 text-gray-500 hover:text-gray-700"
                        >
                            {showPassword ? <EyeOff size={20} /> : <Eye size={20} />}
                        </button>
                    </div>

                    <button
                        type="submit"
                        className="w-full bg-primary text-white font-bold py-3 rounded-lg hover:bg-primary/90 transition-colors shadow-md shadow-primary/20"
                    >
                        Zaloguj się
                    </button>
                </form>

                <div className="relative my-8">
                    <div className="absolute inset-0 flex items-center">
                        <div className="w-full border-t border-gray-200"></div>
                    </div>
                    <div className="relative flex justify-center text-sm">
                        <span className="px-2 bg-white text-gray-400 font-medium">lub</span>
                    </div>
                </div>

                <button
                    onClick={() => alert("Google Login placeholder")}
                    className="w-full flex items-center justify-center gap-2 border border-gray-300 py-3 rounded-lg hover:bg-gray-50 transition-colors"
                >
                    <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 4.93l3.66-2.84z"/>
                        <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>
                    Zaloguj się przez Google
                </button>
            </div>
        </div>
    );
}
