import React, { useState, useEffect } from 'react';
import { Link, useLocation, useNavigate, Outlet } from 'react-router-dom';
import { useAuth } from '../context/AuthContext';
import { useWebsites } from '../context/WebsiteContext';
import toast from 'react-hot-toast';
import {
    LayoutDashboard,
    MessageSquare,
    FileText,
    HelpCircle,
    Settings as SettingsIcon,
    LogOut,
    Menu,
    X,
    User,
    Globe,
    Users,
    Bell
} from 'lucide-react';

const Layout = ({ children }) => {
    const { user, logout } = useAuth();
    const { websites } = useWebsites();
    const location = useLocation();
    const navigate = useNavigate();
    const [isSidebarOpen, setIsSidebarOpen] = useState(false);
    const [unreadNotifications, setUnreadNotifications] = useState(0);

    const hasWebsites = websites.length > 0;

    useEffect(() => {
        const fetchUnreadCount = async () => {
            try {
                const response = await api.get('/notifications/unread-count');
                setUnreadNotifications(response.data.count);
            } catch (error) {
                console.error('Failed to fetch unread count:', error);
            }
        };

        if (user) {
            fetchUnreadCount();
            const interval = setInterval(fetchUnreadCount, 60000); // Poll every minute
            return () => clearInterval(interval);
        }
    }, [user]);

    const handleLogout = () => {
        logout();
        navigate('/login');
    };

    const navItems = [
        { icon: LayoutDashboard, label: 'Dashboard', path: '/dashboard' },
        { icon: Globe, label: 'Websites', path: '/websites' },
        { icon: MessageSquare, label: 'Chats', path: '/chats' },
        { icon: Users, label: 'Users', path: '/users' },
        { icon: FileText, label: 'Content', path: '/content' },
        { icon: HelpCircle, label: 'Unanswered', path: '/unanswered-questions' },
        { icon: MessageSquare, label: 'FAQs', path: '/faqs' },
        { icon: Bell, label: 'Notifications', path: '/notifications' },
        { icon: SettingsIcon, label: 'Settings', path: '/settings' },
    ];

    return (
        <div className="min-h-screen bg-secondary-50 flex">
            {/* Sidebar */}
            <aside
                className={`fixed inset-y-0 left-0 z-50 w-64 bg-white border-r border-secondary-200 transform transition-transform duration-300 ease-in-out lg:translate-x-0 lg:static lg:inset-0 ${isSidebarOpen ? 'translate-x-0' : '-translate-x-full'
                    }`}
            >
                <div className="h-full flex flex-col">
                    {/* Logo */}
                    <div className="h-16 flex items-center px-6 border-b border-secondary-100">
                        <span className="text-xl font-bold bg-gradient-to-r from-primary-600 to-primary-400 bg-clip-text text-transparent">
                            CustomerAgent
                        </span>
                    </div>

                    {/* Navigation */}
                    <nav className="flex-1 px-4 py-6 space-y-1 overflow-y-auto">
                        {navItems.map((item) => {
                            const Icon = item.icon;
                            const isActive = location.pathname === item.path;
                            const isAlwaysEnabled = ['Websites', 'Settings', 'Notifications'].includes(item.label);
                            const isDisabled = !hasWebsites && !isAlwaysEnabled;

                            return (
                                <Link
                                    key={item.path}
                                    to={isDisabled ? '#' : item.path}
                                    onClick={(e) => {
                                        if (isDisabled) {
                                            e.preventDefault();
                                            toast.error('Please add a website first to access this section', {
                                                id: 'sidebar-disabled-toast'
                                            });
                                        }
                                    }}
                                    className={`flex items-center px-4 py-3 text-sm font-medium rounded-xl transition-all duration-200 ${isActive
                                        ? 'bg-primary-50 text-primary-700 shadow-sm'
                                        : isDisabled
                                            ? 'text-secondary-300 cursor-not-allowed'
                                            : 'text-secondary-600 hover:bg-secondary-50 hover:text-secondary-900'
                                        }`}
                                >
                                    <Icon className={`w-5 h-5 mr-3 ${isActive ? 'text-primary-600' : isDisabled ? 'text-secondary-200' : 'text-secondary-400'}`} />
                                    {item.label}
                                </Link>
                            );
                        })}
                    </nav>

                    {/* User Profile */}
                    <div className="p-4 border-t border-secondary-100">
                        <div className="flex items-center p-3 rounded-xl bg-secondary-50 mb-3">
                            <div className="w-10 h-10 rounded-full bg-primary-100 flex items-center justify-center text-primary-600 font-semibold">
                                {user?.email?.[0].toUpperCase() || <User className="w-5 h-5" />}
                            </div>
                            <div className="ml-3 overflow-hidden">
                                <p className="text-sm font-medium text-secondary-900 truncate">{user?.email}</p>
                                <p className="text-xs text-secondary-500 truncate">Admin</p>
                            </div>
                        </div>
                        <button
                            onClick={handleLogout}
                            className="w-full flex items-center justify-center px-4 py-2 text-sm font-medium text-red-600 bg-red-50 rounded-lg hover:bg-red-100 transition-colors"
                        >
                            <LogOut className="w-4 h-4 mr-2" />
                            Sign Out
                        </button>
                    </div>
                </div>
            </aside>

            {/* Mobile Overlay */}
            {isSidebarOpen && (
                <div
                    className="fixed inset-0 z-40 bg-secondary-900/50 backdrop-blur-sm lg:hidden"
                    onClick={() => setIsSidebarOpen(false)}
                />
            )}

            {/* Main Content */}
            <div className="flex-1 flex flex-col min-w-0 overflow-hidden">
                <header className="h-16 bg-white border-b border-secondary-200 flex items-center justify-between px-4 lg:px-8 shrink-0">
                    <div className="flex items-center gap-4">
                        <button
                            onClick={() => setIsSidebarOpen(!isSidebarOpen)}
                            className="p-2 rounded-lg text-secondary-600 hover:bg-secondary-100 lg:hidden"
                        >
                            {isSidebarOpen ? <X className="w-6 h-6" /> : <Menu className="w-6 h-6" />}
                        </button>
                        <span className="text-lg font-bold text-secondary-900 lg:hidden">CustomerAgent</span>
                    </div>

                    <div className="flex items-center gap-4">
                        <Link
                            to="/notifications"
                            className="p-2 bg-secondary-50 text-secondary-600 hover:bg-secondary-100 rounded-xl transition-all relative group"
                            title="Notifications"
                        >
                            <Bell className="w-5 h-5 group-hover:rotate-12 transition-transform" />
                            {unreadNotifications > 0 && (
                                <span className="absolute top-1.5 right-1.5 w-2.5 h-2.5 bg-red-500 border-2 border-white rounded-full animate-pulse" />
                            )}
                        </Link>
                    </div>
                </header>

                {/* Page Content */}
                <main className="flex-1 overflow-y-auto p-4 lg:p-8">
                    <div className="max-w-7xl mx-auto">
                        <Outlet />
                    </div>
                </main>
            </div>
        </div>
    );
};

export default Layout;