import React, { useState } from 'react';
import { User, Lock, LogIn, Database, ShieldCheck, Loader2, AlertCircle } from 'lucide-react';
import { authService } from '../services/api';

export default function Login({ onLoginSuccess }) {
    const [username, setUsername] = useState('');
    const [password, setPassword] = useState('');
    const [loading, setLoading] = useState(false);
    const [error, setError] = useState(null);

    const handleSubmit = async (e) => {
        e.preventDefault();
        setLoading(true);
        setError(null);

        try {
            const response = await authService.login(username, password);

            // Assuming the API returns { success: true, token: '...', user: { ... } }
            if (response.success) {
                localStorage.setItem('auth_token', response.token);
                localStorage.setItem('user_data', JSON.stringify(response.user));
                onLoginSuccess(response.user);
            } else {
                setError(response.message || 'Credenciales inválidas');
            }
        } catch (err) {
            console.error('Login error:', err);
            setError(err.message || 'Error al conectar con el servidor');
        } finally {
            setLoading(false);
        }
    };

    return (
        <div className="login-page">
            <div className="login-card">
                <div className="login-header">
                    <div className="login-logo">
                        <Database size={32} className="logo-icon" />
                    </div>
                    <h1>ADVICOM SQL Manager</h1>
                    <p>Bienvenido. Ingrese sus credenciales para continuar.</p>
                </div>

                <form onSubmit={handleSubmit} className="login-form">
                    {error && (
                        <div className="error-alert">
                            <AlertCircle size={18} />
                            <span>{error}</span>
                        </div>
                    )}

                    <div className="input-group">
                        <label htmlFor="username">Usuario</label>
                        <div className="input-wrapper">
                            <User className="input-icon" size={18} />
                            <input
                                id="username"
                                type="text"
                                placeholder="ej: admin"
                                value={username}
                                onChange={(e) => setUsername(e.target.value)}
                                required
                            />
                        </div>
                    </div>

                    <div className="input-group">
                        <label htmlFor="password">Contraseña</label>
                        <div className="input-wrapper">
                            <Lock className="input-icon" size={18} />
                            <input
                                id="password"
                                type="password"
                                placeholder="••••••••"
                                value={password}
                                onChange={(e) => setPassword(e.target.value)}
                                required
                            />
                        </div>
                    </div>

                    <button
                        type="submit"
                        className="login-btn"
                        disabled={loading}
                    >
                        {loading ? (
                            <Loader2 className="animate-spin" size={20} />
                        ) : (
                            <>
                                <LogIn size={20} />
                                <span>Iniciar Sesión</span>
                            </>
                        )}
                    </button>
                </form>

                <div className="login-footer">
                    <div className="secure-badge">
                        <ShieldCheck size={14} />
                        <span>Conexión segura SSL</span>
                    </div>
                    <p>© 2026 Advicom Group • v1.0.0</p>
                </div>
            </div>

            <style>{`
                .login-page {
                    height: 100vh;
                    width: 100vw;
                    background: radial-gradient(circle at top right, #1e293b, #0f172a);
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    padding: 1rem;
                    overflow: hidden;
                    position: relative;
                }

                .login-page::before {
                    content: '';
                    position: absolute;
                    top: -10%;
                    right: -10%;
                    width: 40%;
                    height: 40%;
                    background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 70%);
                    z-index: 0;
                }

                .login-page::after {
                    content: '';
                    position: absolute;
                    bottom: -10%;
                    left: -10%;
                    width: 30%;
                    height: 30%;
                    background: radial-gradient(circle, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
                    z-index: 0;
                }

                .login-card {
                    width: 100%;
                    max-width: 420px;
                    background: rgba(30, 41, 59, 0.7);
                    backdrop-filter: blur(20px);
                    border: 1px solid rgba(255, 255, 255, 0.1);
                    border-radius: 1.5rem;
                    padding: 2.5rem;
                    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
                    z-index: 1;
                    animation: slideUp 0.6s ease-out;
                }

                @keyframes slideUp {
                    from { transform: translateY(20px); opacity: 0; }
                    to { transform: translateY(0); opacity: 1; }
                }

                .login-header {
                    text-align: center;
                    margin-bottom: 2rem;
                }

                .login-logo {
                    width: 64px;
                    height: 64px;
                    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
                    border-radius: 1.25rem;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    margin: 0 auto 1.5rem;
                    box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.5);
                }

                .logo-icon {
                    color: white;
                }

                .login-header h1 {
                    font-size: 1.75rem;
                    font-weight: 800;
                    color: white;
                    margin: 0;
                    letter-spacing: -0.025em;
                }

                .login-header p {
                    color: var(--text-secondary);
                    font-size: 0.875rem;
                    margin-top: 0.5rem;
                }

                .login-form {
                    display: flex;
                    flex-direction: column;
                    gap: 1.25rem;
                }

                .error-alert {
                    background: rgba(239, 68, 68, 0.1);
                    border: 1px solid rgba(239, 68, 68, 0.2);
                    padding: 0.75rem 1rem;
                    border-radius: 0.75rem;
                    color: #fca5a5;
                    font-size: 0.8125rem;
                    display: flex;
                    align-items: center;
                    gap: 0.75rem;
                }

                .input-group {
                    display: flex;
                    flex-direction: column;
                    gap: 0.5rem;
                }

                .input-group label {
                    font-size: 0.8125rem;
                    font-weight: 600;
                    color: var(--text-secondary);
                    margin-left: 0.25rem;
                }

                .input-wrapper {
                    position: relative;
                    display: flex;
                    align-items: center;
                }

                .input-icon {
                    position: absolute;
                    left: 1rem;
                    color: var(--text-muted);
                    pointer-events: none;
                }

                .input-wrapper input {
                    width: 100%;
                    background: var(--bg-input);
                    border: 1px solid var(--border);
                    color: white;
                    padding: 0.875rem 1rem 0.875rem 2.875rem;
                    border-radius: 1rem;
                    font-size: 0.875rem;
                    transition: all 0.2s;
                    box-shadow: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
                }

                .input-wrapper input:focus {
                    outline: none;
                    border-color: var(--accent);
                    background: rgba(2, 6, 23, 0.8);
                    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
                }

                .login-btn {
                    margin-top: 1rem;
                    background: linear-gradient(135deg, var(--accent), var(--accent-hover));
                    color: white;
                    border: none;
                    padding: 0.875rem;
                    border-radius: 1rem;
                    font-weight: 700;
                    font-size: 1rem;
                    cursor: pointer;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    gap: 0.75rem;
                    transition: all 0.3s;
                    box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.3);
                }

                .login-btn:hover:not(:disabled) {
                    transform: translateY(-2px);
                    box-shadow: 0 20px 25px -5px rgba(59, 130, 246, 0.4);
                }

                .login-btn:active:not(:disabled) {
                    transform: translateY(0);
                }

                .login-btn:disabled {
                    opacity: 0.7;
                    cursor: not-allowed;
                }

                .login-footer {
                    margin-top: 2rem;
                    text-align: center;
                }

                .secure-badge {
                    display: inline-flex;
                    align-items: center;
                    gap: 0.375rem;
                    color: var(--success);
                    font-size: 0.75rem;
                    font-weight: 600;
                    margin-bottom: 1rem;
                    padding: 0.375rem 0.75rem;
                    background: rgba(16, 185, 129, 0.1);
                    border-radius: 2rem;
                }

                .login-footer p {
                    color: var(--text-muted);
                    font-size: 0.75rem;
                    margin: 0;
                }

                .animate-spin {
                    animation: spin 1s linear infinite;
                }
                @keyframes spin {
                    from { transform: rotate(0deg); }
                    to { transform: rotate(360deg); }
                }
            `}</style>
        </div>
    );
}