// deeplinks.js - Deep Link Manager for Game Timer

// Available actions
const VALID_ACTIONS = ['start', 'pause', 'toggle', 'nextplayer', 'reset'];

// Class to manage all deep link functionality
class DeepLinkManager {
    constructor() {
        this.actionHandlers = {};
        
        // Initialize listeners
        this.initServiceWorkerListener();
        this.initHashChangeListener();
        this.initPopStateListener();
    }
    
    // Register action handlers
    registerHandler(action, handlerFn) {
        if (VALID_ACTIONS.includes(action)) {
            this.actionHandlers[action] = handlerFn;
            console.log(`Registered handler for action: ${action}`);
        } else {
            console.warn(`Attempted to register handler for invalid action: ${action}`);
        }
    }
    
    // Extract action from URL parameters (search or hash)
    getActionFromUrl() {
        // Check for action in both search params and hash
        const searchParams = new URLSearchParams(window.location.search);
        const hashParams = new URLSearchParams(window.location.hash.substring(1));
        
        // First check search params (for direct curl or navigation)
        const searchAction = searchParams.get('action');
        if (searchAction && VALID_ACTIONS.includes(searchAction)) {
            console.log('Found action in search params:', searchAction);
            return searchAction;
        }
        
        // Then check hash params (existing deep link mechanism)
        const hashAction = hashParams.get('action');
        if (hashAction && VALID_ACTIONS.includes(hashAction)) {
            console.log('Found action in hash params:', hashAction);
            return hashAction;
        }
        
        return null;
    }
    
    // Process an action
    handleAction(action) {
        if (!action) return;
        
        console.log('Processing action:', action);
        
        if (this.actionHandlers[action]) {
            this.actionHandlers[action]();
        } else {
            console.log('No handler registered for action:', action);
        }
    }
    
    // Handle deep links from URL
    processDeepLink() {
        // Get action from URL parameters
        const action = this.getActionFromUrl();
        
        // Process the action if found
        if (action) {
            this.handleAction(action);
            
            // Clear the parameters to prevent duplicate actions if page is refreshed
            if (window.history && window.history.replaceState) {
                // Create new URL without the action parameter
                const newUrl = window.location.pathname;
                window.history.replaceState({}, document.title, newUrl);
            }
        }
    }
    
    // Initialize service worker message listener
    initServiceWorkerListener() {
        if ('serviceWorker' in navigator) {
            navigator.serviceWorker.addEventListener('message', (event) => {
                if (event.data && event.data.type === 'ACTION') {
                    console.log('Received action from service worker:', event.data.action);
                    this.handleAction(event.data.action);
                }
            });
        }
    }
    
    // Initialize hash change listener
    initHashChangeListener() {
        window.addEventListener('hashchange', () => {
            console.log('Hash changed, checking for actions');
            this.processDeepLink();
        });
    }
    
    // Initialize popstate listener for navigation events
    initPopStateListener() {
        window.addEventListener('popstate', () => {
            console.log('Navigation occurred, checking for actions');
            this.processDeepLink();
        });
    }
    
    // Send an action to the service worker
    sendActionToServiceWorker(action) {
        if ('serviceWorker' in navigator && navigator.serviceWorker.controller) {
            navigator.serviceWorker.controller.postMessage({
                type: 'PROCESS_ACTION',
                action: action
            });
        }
    }
    
    // Generate a deep link URL for a specific action
    generateDeepLink(action, useHash = false) {
        if (!VALID_ACTIONS.includes(action)) {
            console.warn(`Cannot generate deep link for invalid action: ${action}`);
            return null;
        }
        
        const baseUrl = window.location.origin + window.location.pathname;
        return useHash ? 
            `${baseUrl}#action=${action}` : 
            `${baseUrl}?action=${action}`;
    }
}

// Export singleton instance
const deepLinkManager = new DeepLinkManager();
export default deepLinkManager;