frontend/src/components/LoginScreen.jsx

import React, { useState } from 'react';
import axios from 'axios';
import { motion } from 'framer-motion';
import { FaLock, FaSpinner } from 'react-icons/fa';

const LoginScreen = ({ onAuthenticated }) => {
    const [password, setPassword] = useState('');
    const [loading, setLoading] = useState(false);
    const [error, setError] = useState(null);

    const handleSubmit = async (e) => {
        e.preventDefault();
        if (!password.trim()) {
            setError('Please enter a password');
            return;
        }

        setLoading(true);
        setError(null);

        try {
            const response = await axios.post('/api/auth/verify', { password });
            if (response.data.authenticated) {
                // Store auth state in sessionStorage (cleared when browser closes)
                sessionStorage.setItem('auth_verified', 'true');
                onAuthenticated();
            }
        } catch (err) {
            if (err.response?.status === 401) {
                setError('Invalid password. Please try again.');
            } else {
                setError('Authentication failed. Please try again.');
            }
            console.error('Auth error:', err);
        } finally {
            setLoading(false);
        }
    };

    return (
        <div className="min-h-screen bg-gradient-to-br from-blue-600 to-purple-700 flex items-center justify-center p-4">
            <motion.div
                initial={{ opacity: 0, scale: 0.9 }}
                animate={{ opacity: 1, scale: 1 }}
                className="bg-white rounded-2xl shadow-2xl p-8 w-full max-w-md"
            >
                <div className="text-center mb-8">
                    <div className="w-16 h-16 bg-blue-100 rounded-full flex items-center justify-center mx-auto mb-4">
                        <FaLock className="text-3xl text-blue-600" />
                    </div>
                    <h1 className="text-2xl font-bold text-gray-900">Certificate Manager</h1>
                    <p className="text-gray-600 mt-2">Enter password to access</p>
                </div>

                <form onSubmit={handleSubmit} className="space-y-6">
                    <div>
                        <label className="block text-sm font-medium text-gray-700 mb-2">
                            Password
                        </label>
                        <input
                            type="password"
                            value={password}
                            onChange={(e) => setPassword(e.target.value)}
                            className="w-full border border-gray-300 rounded-lg p-3 text-gray-900 focus:ring-2 focus:ring-blue-500 focus:border-blue-500 outline-none"
                            placeholder="Enter access password"
                            autoFocus
                        />
                    </div>

                    {error && (
                        <motion.div
                            initial={{ opacity: 0, y: -10 }}
                            animate={{ opacity: 1, y: 0 }}
                            className="bg-red-50 border border-red-200 text-red-700 px-4 py-3 rounded-lg text-sm"
                        >
                            {error}
                        </motion.div>
                    )}

                    <motion.button
                        whileHover={{ scale: 1.02 }}
                        whileTap={{ scale: 0.98 }}
                        type="submit"
                        disabled={loading}
                        className={`w-full py-3 rounded-lg text-white font-semibold shadow-md flex items-center justify-center space-x-2 transition-all ${loading
                                ? 'bg-gray-400 cursor-not-allowed'
                                : 'bg-blue-600 hover:bg-blue-700 hover:shadow-lg'
                            }`}
                    >
                        {loading ? (
                            <>
                                <FaSpinner className="animate-spin" />
                                <span>Verifying...</span>
                            </>
                        ) : (
                            <>
                                <FaLock />
                                <span>Access Application</span>
                            </>
                        )}
                    </motion.button>
                </form>

                <p className="text-center text-xs text-gray-500 mt-6">
                    Protected application. Contact administrator for access.
                </p>
            </motion.div>
        </div>
    );
};

export default LoginScreen;