/**
 * CatOS Core System Module
 * Main system initialization and state management
 */
class CatOSCore {
    constructor() {
        // System state
        this.windows = new Map();
        this.apps = new Map();
        this.nextWindowId = 1;
        this.focusedWindow = null;
        this.startMenuOpen = false;
        this.wallpapers = [
            'static/wallpapers/wallpaper1.png',
            'static/wallpapers/wallpaper2.png',
            'static/wallpapers/wallpaper3.png',
            'static/wallpapers/wallpaper4.png',
            'static/wallpapers/wallpaper5.png',
            'static/wallpapers/wallpaper6.png'
        ];
    }

    // Initialize CatOS
    init() {
        this.showLoadingScreen();
        this.updateClock();
        this.setRandomWallpaper();
        
        // Boot sequence
        setTimeout(() => {
            this.hideLoadingScreen();
            this.playStartupSound();
            this.showWelcomeMessage();
        }, 3000);
    }

    // Loading screen management
    showLoadingScreen() {
        const loadingScreen = document.getElementById('loading-screen');
        if (loadingScreen) {
            loadingScreen.classList.remove('hidden');
        } else {
            console.warn('Loading screen element not found');
        }
    }

    hideLoadingScreen() {
        const loadingScreen = document.getElementById('loading-screen');
        if (loadingScreen) {
            loadingScreen.classList.add('hidden');
            setTimeout(() => {
                loadingScreen.style.display = 'none';
            }, 500);
        } else {
            console.warn('Loading screen element not found');
        }
    }

    // Clock functionality
    updateClock() {
        const updateTime = () => {
            const now = new Date();
            const timeString = now.toLocaleTimeString('en-US', { 
                hour12: false,
                hour: '2-digit',
                minute: '2-digit'
            });
            
            const clockElement = document.querySelector('.time');
            if (clockElement) {
                clockElement.textContent = timeString;
            }
        };
        
        updateTime(); // Update immediately
        setInterval(updateTime, 1000); // Update every second
    }

    // Wallpaper management
    setRandomWallpaper() {
        const desktop = document.getElementById('desktop');
        if (!desktop) return;
        
        const randomWallpaper = this.wallpapers[Math.floor(Math.random() * this.wallpapers.length)];
        
        // Create a temporary image to preload
        const img = new Image();
        img.onload = () => {
            desktop.style.backgroundImage = `url('${randomWallpaper}')`;
            desktop.style.backgroundSize = 'cover';
            desktop.style.backgroundPosition = 'center';
            desktop.style.backgroundRepeat = 'no-repeat';
        };
        img.src = randomWallpaper;
    }

    // System sounds and notifications
    playStartupSound() {
        // Cat-themed startup notification
        this.showNotification('🐱‍💻 CatOS Ready!', 'Welcome to your purr-fessional workspace!');
    }

    showWelcomeMessage() {
        // Optional: Show welcome message for new users
        if (!localStorage.getItem('catos-visited')) {
            this.showNotification(
                '🎉 First time visitor detected!', 
                'Try opening the terminal and typing "help" for cat commands!'
            );
            localStorage.setItem('catos-visited', 'true');
        }
    }

    showNotification(title, message) {
        // Simple notification system
        const notification = document.createElement('div');
        notification.className = 'system-notification';
        notification.innerHTML = `
            <div class="notification-header">${title}</div>
            <div class="notification-body">${message}</div>
        `;
        
        // Add notification styles if not already present
        if (!document.querySelector('#notification-styles')) {
            const style = document.createElement('style');
            style.id = 'notification-styles';
            style.textContent = `
                .system-notification {
                    position: fixed;
                    top: 80px;
                    right: 20px;
                    background: var(--window-bg);
                    border: 1px solid var(--window-border);
                    border-radius: var(--radius-lg);
                    padding: var(--spacing-md);
                    box-shadow: var(--window-shadow);
                    min-width: 300px;
                    z-index: 10000;
                    animation: slideInRight 0.3s ease;
                }
                
                .notification-header {
                    font-weight: 600;
                    color: var(--text-primary);
                    margin-bottom: var(--spacing-sm);
                }
                
                .notification-body {
                    color: var(--text-secondary);
                    font-size: 0.875rem;
                }
                
                @keyframes slideInRight {
                    from { transform: translateX(100%); opacity: 0; }
                    to { transform: translateX(0); opacity: 1; }
                }
            `;
            document.head.appendChild(style);
        }
        
        document.body.appendChild(notification);
        
        // Auto remove after 5 seconds
        setTimeout(() => {
            notification.style.animation = 'slideInRight 0.3s ease reverse';
            setTimeout(() => {
                if (notification.parentNode) {
                    notification.parentNode.removeChild(notification);
                }
            }, 300);
        }, 5000);
    }

    // App registration
    registerApps() {
        // This will be called after modules are registered
        if (this.appManager) {
            this.appManager.registerAllApps(this);
        }
    }

    // Event listener setup
    setupEventListeners() {
        // This will be called after modules are registered
        if (this.eventHandler) {
            this.eventHandler.setup(this);
        }
    }

    // Method to be called by other modules to register themselves
    registerModule(name, moduleInstance) {
        this[name] = moduleInstance;
        moduleInstance.core = this;
    }
}

// Make available globally
window.CatOSCore = CatOSCore;