/**
 * AniWorld - WebSocket Client Module
 *
 * WebSocket connection management and event handling.
 *
 * Dependencies: constants.js
 */

var AniWorld = window.AniWorld || {};

AniWorld.WebSocketClient = (function() {
    'use strict';

    const WS_EVENTS = AniWorld.Constants.WS_EVENTS;

    let socket = null;
    let isConnected = false;
    let eventHandlers = {};

    /**
     * Initialize WebSocket connection
     * @param {Object} handlers - Object mapping event names to handler functions
     */
    function init(handlers) {
        handlers = handlers || {};
        eventHandlers = handlers;

        // Check if Socket.IO is available
        if (typeof io === 'undefined') {
            console.error('Socket.IO not loaded');
            return;
        }

        socket = io();

        // Handle connection events
        socket.on('connected', function(data) {
            console.log('WebSocket connection confirmed', data);
        });

        socket.on('connect', function() {
            isConnected = true;
            console.log('Connected to server');

            // Subscribe to rooms
            if (socket.join) {
                socket.join('scan');
                socket.join('downloads');
                socket.join('queue');
            }

            // Call custom connect handler if provided
            if (eventHandlers.onConnect) {
                eventHandlers.onConnect();
            }
        });

        socket.on('disconnect', function() {
            isConnected = false;
            console.log('Disconnected from server');

            // Call custom disconnect handler if provided
            if (eventHandlers.onDisconnect) {
                eventHandlers.onDisconnect();
            }
        });

        // Set up event handlers for common events
        setupDefaultHandlers();
    }

    /**
     * Set up default event handlers
     */
    function setupDefaultHandlers() {
        if (!socket) return;

        // Register any events that have handlers
        Object.keys(eventHandlers).forEach(function(eventName) {
            if (eventName !== 'onConnect' && eventName !== 'onDisconnect') {
                socket.on(eventName, eventHandlers[eventName]);
            }
        });
    }

    /**
     * Register an event handler
     * @param {string} eventName - The event name
     * @param {Function} handler - The handler function
     */
    function on(eventName, handler) {
        if (!socket) {
            console.warn('Socket not initialized');
            return;
        }

        eventHandlers[eventName] = handler;
        socket.off(eventName); // Remove existing handler
        socket.on(eventName, handler);
    }

    /**
     * Remove an event handler
     * @param {string} eventName - The event name
     */
    function off(eventName) {
        if (!socket) return;

        delete eventHandlers[eventName];
        socket.off(eventName);
    }

    /**
     * Emit an event to the server
     * @param {string} eventName - The event name
     * @param {*} data - The data to send
     */
    function emit(eventName, data) {
        if (!socket || !isConnected) {
            console.warn('Socket not connected');
            return;
        }

        socket.emit(eventName, data);
    }

    /**
     * Get connection status
     * @returns {boolean} True if connected
     */
    function getConnectionStatus() {
        return isConnected;
    }

    /**
     * Get the socket instance
     * @returns {Object} The Socket.IO socket instance
     */
    function getSocket() {
        return socket;
    }

    /**
     * Disconnect from server
     */
    function disconnect() {
        if (socket) {
            socket.disconnect();
            socket = null;
            isConnected = false;
        }
    }

    // Public API
    return {
        init: init,
        on: on,
        off: off,
        emit: emit,
        isConnected: getConnectionStatus,
        getSocket: getSocket,
        disconnect: disconnect
    };
})();