/**
 * CatOS Event Handler Module
 * Manages all user interactions and system events
 */
class EventHandler {
    constructor(core) {
        this.core = core;
    }

    setup(core) {
        this.core = core;
        
        // Desktop icon interactions
        document.querySelectorAll('.desktop-icon').forEach(icon => {
            icon.addEventListener('dblclick', this.handleIconDoubleClick.bind(this));
            icon.addEventListener('click', this.handleIconClick.bind(this));
        });

        // Start button
        document.getElementById('start-button').addEventListener('click', this.toggleStartMenu.bind(this));

        // Start menu apps
        document.querySelectorAll('.menu-app').forEach(app => {
            app.addEventListener('click', this.handleMenuAppClick.bind(this));
        });

        // Desktop context menu
        document.getElementById('desktop').addEventListener('contextmenu', this.showContextMenu.bind(this));
        
        // Close context menu on click
        document.addEventListener('click', this.hideContextMenu.bind(this));
        
        // Close start menu on outside click
        document.addEventListener('click', (e) => {
            if (!e.target.closest('.start-button') && !e.target.closest('.start-menu')) {
                this.hideStartMenu();
            }
        });

        // Keyboard shortcuts
        document.addEventListener('keydown', this.handleKeyboard.bind(this));

        // Window container clicks (deselect icons)
        document.getElementById('windows-container').addEventListener('click', (e) => {
            if (e.target.id === 'windows-container') {
                this.deselectAllIcons();
            }
        });

        // Context menu actions
        document.querySelectorAll('.context-item').forEach(item => {
            item.addEventListener('click', this.handleContextMenuAction.bind(this));
        });
    }

    // Icon interactions
    handleIconClick(e) {
        this.deselectAllIcons();
        e.currentTarget.classList.add('selected');
        
        // Add cat-like feedback
        e.currentTarget.style.transform = 'scale(0.95)';
        setTimeout(() => {
            e.currentTarget.style.transform = '';
        }, 150);
    }

    handleIconDoubleClick(e) {
        const icon = e.currentTarget;
        const appType = icon.dataset.app;
        const projectId = icon.dataset.project;
        
        // Add launch animation
        icon.style.animation = 'bounce 0.5s ease';
        setTimeout(() => {
            icon.style.animation = '';
        }, 500);
        
        if (appType === 'project-viewer' && projectId) {
            this.core.appManager.launchApp('project-viewer', { projectId });
        } else {
            this.core.appManager.launchApp(appType);
        }
    }

    deselectAllIcons() {
        document.querySelectorAll('.desktop-icon.selected').forEach(icon => {
            icon.classList.remove('selected');
        });
    }

    // Start Menu Management
    toggleStartMenu() {
        const menu = document.getElementById('start-menu');
        const button = document.getElementById('start-button');
        
        if (this.core.startMenuOpen) {
            this.hideStartMenu();
        } else {
            menu.classList.add('show');
            button.classList.add('active');
            this.core.startMenuOpen = true;
        }
    }

    hideStartMenu() {
        const menu = document.getElementById('start-menu');
        const button = document.getElementById('start-button');
        
        menu.classList.remove('show');
        button.classList.remove('active');
        this.core.startMenuOpen = false;
    }

    handleMenuAppClick(e) {
        const app = e.currentTarget;
        const appType = app.dataset.app;
        
        // Close start menu with animation
        this.hideStartMenu();
        
        // Small delay for better UX
        setTimeout(() => {
            this.core.appManager.launchApp(appType);
        }, 150);
    }

    // Context Menu
    showContextMenu(e) {
        e.preventDefault();
        
        const contextMenu = document.getElementById('context-menu');
        contextMenu.style.left = e.clientX + 'px';
        contextMenu.style.top = e.clientY + 'px';
        contextMenu.classList.add('show');
        
        // Ensure menu stays within viewport
        const rect = contextMenu.getBoundingClientRect();
        if (rect.right > window.innerWidth) {
            contextMenu.style.left = (window.innerWidth - rect.width - 10) + 'px';
        }
        if (rect.bottom > window.innerHeight) {
            contextMenu.style.top = (window.innerHeight - rect.height - 10) + 'px';
        }
    }

    hideContextMenu(e) {
        const contextMenu = document.getElementById('context-menu');
        if (!e.target.closest('.context-menu')) {
            contextMenu.classList.remove('show');
        }
    }

    handleContextMenuAction(e) {
        const action = e.currentTarget.dataset.action;
        
        switch(action) {
            case 'refresh':
                this.refreshDesktop();
                break;
            case 'new-folder':
                this.createNewFolder();
                break;
            case 'properties':
                this.showDesktopProperties();
                break;
        }
        
        this.hideContextMenu({ target: document.body });
    }

    refreshDesktop() {
        this.core.setRandomWallpaper();
        this.core.showNotification('🔄 Desktop Refreshed', 'New wallpaper loaded! Looking purrfect! 😸');
    }

    createNewFolder() {
        this.core.showNotification('📁 Feature Coming Soon', 'Folder creation will be available in the next CatOS update! 🐱‍💻');
    }

    showDesktopProperties() {
        this.core.appManager.launchApp('about');
    }

    // Keyboard shortcuts
    handleKeyboard(e) {
        // System shortcuts
        if (e.ctrlKey || e.metaKey) {
            switch(e.key) {
                case '`': // Ctrl+` opens terminal
                    e.preventDefault();
                    this.core.appManager.launchApp('terminal');
                    break;
                case 'r': // Ctrl+R refreshes desktop
                    if (e.target.tagName !== 'INPUT' && e.target.tagName !== 'TEXTAREA') {
                        e.preventDefault();
                        this.refreshDesktop();
                    }
                    break;
            }
        }

        // Special keys
        switch(e.key) {
            case 'F1':
                e.preventDefault();
                this.core.appManager.launchApp('about');
                break;
            case 'F5':
                e.preventDefault();
                this.refreshDesktop();
                break;
            case 'Delete':
                // Delete selected desktop items (if any)
                const selected = document.querySelector('.desktop-icon.selected');
                if (selected) {
                    this.core.showNotification('🗑️ Cannot Delete', 'System items are protected by cat law! 😹');
                }
                break;
            case 'Escape':
                // Close context menu and start menu
                this.hideContextMenu({ target: document.body });
                if (this.core.startMenuOpen) {
                    this.hideStartMenu();
                }
                break;
        }

        // Easter eggs
        this.handleEasterEggs(e);
    }

    handleEasterEggs(e) {
        // Konami code for cats: ↑↑↓↓←→←→BA
        if (!this.konamiSequence) {
            this.konamiSequence = [];
        }
        
        const konamiCode = ['ArrowUp', 'ArrowUp', 'ArrowDown', 'ArrowDown', 
                          'ArrowLeft', 'ArrowRight', 'ArrowLeft', 'ArrowRight', 'KeyB', 'KeyA'];
        
        if (e.code === konamiCode[this.konamiSequence.length]) {
            this.konamiSequence.push(e.code);
            
            if (this.konamiSequence.length === konamiCode.length) {
                this.activateCatMode();
                this.konamiSequence = [];
            }
        } else {
            this.konamiSequence = [];
        }

        // Cat sound effects
        if (e.key === 'm' && !e.target.matches('input, textarea')) {
            this.playMeowSound();
        }
    }

    activateCatMode() {
        this.core.showNotification('🎉 Cat Mode Activated!', 'You found the secret cat code! Enjoy the purr-ks! 😸');
        
        // Add some fun visual effects
        document.body.style.animation = 'rainbow 2s infinite';
        
        // Add temporary CSS for rainbow effect
        if (!document.getElementById('cat-mode-styles')) {
            const style = document.createElement('style');
            style.id = 'cat-mode-styles';
            style.textContent = `
                @keyframes rainbow {
                    0% { filter: hue-rotate(0deg); }
                    100% { filter: hue-rotate(360deg); }
                }
            `;
            document.head.appendChild(style);
        }
        
        // Reset after 5 seconds
        setTimeout(() => {
            document.body.style.animation = '';
        }, 5000);
    }

    playMeowSound() {
        // Visual feedback for meow (since we can't guarantee audio)
        const meows = ['😸', '🙀', '😻', '😹', '😾', '🐱'];
        const meow = meows[Math.floor(Math.random() * meows.length)];
        
        const meowElement = document.createElement('div');
        meowElement.textContent = meow;
        meowElement.style.cssText = `
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 3rem;
            z-index: 9999;
            pointer-events: none;
            animation: meowPop 1s ease forwards;
        `;
        
        // Add meow animation CSS if not already present
        if (!document.getElementById('meow-styles')) {
            const style = document.createElement('style');
            style.id = 'meow-styles';
            style.textContent = `
                @keyframes meowPop {
                    0% { transform: translate(-50%, -50%) scale(0); opacity: 1; }
                    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
                    100% { transform: translate(-50%, -50%) scale(1.5); opacity: 0; }
                }
            `;
            document.head.appendChild(style);
        }
        
        document.body.appendChild(meowElement);
        
        setTimeout(() => {
            if (meowElement.parentNode) {
                meowElement.parentNode.removeChild(meowElement);
            }
        }, 1000);
    }
}

// Export for use in main system
window.CatOSEventHandler = EventHandler;