/**
 * 消息模块
 * 处理聊天消息的发送、接收和显示
 */
import { showNotification, generateId } from './utils.js';
import store from './store.js';
import { mockMessages } from './models.js';
// 消息相关的状态管理方法
let messageState = {
    messages: [...mockMessages],
    unreadCount: 0,
    isSidebarOpen: false
};

let listeners = [];

/**
 * 订阅状态变化
 * @param {Function} callback - 回调函数
 * @returns {Function} 取消订阅的函数
 */
export function subscribe(callback) {
    listeners.push(callback);
    return () => {
        listeners = listeners.filter(cb => cb !== callback);
    };
}

/**
 * 通知所有监听器
 * @param {Object} changes - 变化对象
 */
function notify(changes) {
    listeners.forEach(cb => cb(messageState, changes));
}

/**
 * 添加消息
 * @param {Object} message - 消息对象
 */
export function addMessage (message) {
    messageState.messages.push(message);

    // 如果侧边栏关闭且不是自己发的，增加未读
    if (!messageState.isSidebarOpen && !message.isSelf) {
        messageState.unreadCount++;
        notify({ type: 'SIDEBAR_TOGGLE', unreadCount: messageState.unreadCount });
    }

    notify({ type: 'NEW_MESSAGE', message, unreadCount: messageState.unreadCount });
}

/**
 * 发送聊天消息
 * @param {Object} message - 消息对象
 * @param {Object} renderstreaming - WebRTC连接管理实例
 */
export function sendChatMessage(message) {
    if (store.getRenderStreaming()) {
        store.getRenderStreaming().sendMessage({
            type: 'chat-message',
            message: message,
        });
    }
}

/**
 * 处理接收到的聊天消息
 * @param {Object} data - 消息数据
 */
export function handleChatMessage(data) {
    console.log('处理聊天:', data);
    addMessage(data);

    const isImage = data.content && data.content.startsWith('data:image/');
    const messageType = isImage ? 'file' : 'text';

    // 显示通知
    if (!data.isSelf) {
        const content = isImage ? '[图片]' : data.content;
        showNotification(`${data.senderName}: ${content.substring(0, 20)}${content.length > 20 ? '...' : ''}`);
    }
}

/**
 * 切换侧边栏
 * @returns {boolean} 切换后的状态
 */
export function toggleSidebar() {
    messageState.isSidebarOpen = !messageState.isSidebarOpen;
    if (messageState.isSidebarOpen) {
        messageState.unreadCount = 0;
    }
    notify({ type: 'SIDEBAR_TOGGLE', isOpen: messageState.isSidebarOpen, unreadCount: messageState.unreadCount });
    return messageState.isSidebarOpen;
}

/**
 * 获取消息状态
 * @returns {Object} 消息状态
 */
export function getMessageState() {
    return messageState;
}

/**
 * 发送消息
 */
export function sendMessage() {
    const chatInput = document.getElementById('chatInput');
    const content = chatInput.value.trim();

    if (content) {
        const state = store.getState();
        const message = {
            id: generateId(),
            senderId: state.session.localUser.id,
            senderName: state.session.localUser.name,
            senderAvatar: state.session.localUser.avatar,
            content: content,
            type: 'text',
            timestamp: new Date().toISOString(),
            isSelf: true
        };

        addMessage(message);

        const newMessage = { ...message };
        newMessage.isSelf = false;
        chatInput.value = '';
        // 发送消息到服务器
        sendChatMessage(newMessage);

        //wsManager.send('chat-message', message);
    }
}

/**
 * 处理聊天输入回车
 * @param {KeyboardEvent} event - 键盘事件
 */
export function handleChatSubmit(event) {
    if (event.key === 'Enter') {
        sendMessage();
    }
}

/**
 * 打开图片选择器
 */
export function openImagePicker() {
    document.getElementById('imageInput').click();
}

/**
 * 处理图片上传
 * @param {Event} event - 事件对象
 */
export function handleImageUpload(event) {
    const file = event.target.files[0];
    if (file) {
        // 检查文件类型
        if (!file.type.startsWith('image/')) {
            showNotification('请选择图片文件', 3000);
            return;
        }

        // 检查文件大小（限制为5MB）
        if (file.size > 5 * 1024 * 1024) {
            showNotification('图片文件不能超过5MB', 3000);
            return;
        }

        // 读取图片文件
        const reader = new FileReader();
        reader.onload = function (e) {
            const imageUrl = e.target.result;
            sendImageMessage(imageUrl, file.name);
        };
        reader.readAsDataURL(file);

        // 重置文件输入
        event.target.value = '';
    }
}

/**
 * 发送图片消息
 * @param {string} imageUrl - 图片URL
 * @param {string} fileName - 文件名
 */
export function sendImageMessage(imageUrl, fileName) {
    const state = store.getState();
    const newMessage = {
        id: generateId(),
        senderId: state.session.localUser.id,
        senderName: state.session.localUser.name,
        senderAvatar: state.session.localUser.avatar,
        content: imageUrl,
        fileName: fileName,
        type: 'file',
        timestamp: new Date().toISOString(),
        isSelf: true
    };

    (newMessage);

    // 发送消息到服务器
    // wsManager.send('send-message', newMessage);
}

/**
 * 绑定消息相关的DOM事件
 */
export function bindMessageEvents() {
    // 发送消息
    window.sendMessage = sendMessage;

    // 处理聊天输入回车
    window.handleChatSubmit = handleChatSubmit;

    // 打开图片选择器
    window.openImagePicker = openImagePicker;

    // 处理图片上传
    window.handleImageUpload = handleImageUpload;
}

// 导出所有函数
export default {
    sendMessage,
    handleChatSubmit,
    openImagePicker,
    handleImageUpload,
    sendImageMessage,
    bindMessageEvents,
    addMessage,
    sendChatMessage,
    handleChatMessage,
    toggleSidebar,
    getMessageState,
    subscribe
};