/**
 * connect视图逻辑
 * 处理初始连接界面的UI、用户设置、WebSocket连接状态显示
 */

import { showNotification } from './utils.js';
import store from './store.js';

const MAX_AVATAR_SIZE = 2 * 1024 * 1024; // 2MB

// WebSocket连接状态更新回调
let onWsStatusChange = null;
let cachedOnlineUsers = [];

/**
 * 设置WebSocket状态变化回调
 * @param {function} callback - 回调函数(connected: boolean)
 */
export function setWsStatusCallback(callback) {
    onWsStatusChange = callback;
}

/**
 * 更新WebSocket状态显示
 * @param {boolean} connected - 是否已连接
 */
export function updateWsStatus(connected) {
    const wsStatusDot = document.getElementById('wsStatusDot');
    const wsStatusText = document.getElementById('wsStatusText');
    
    if (wsStatusDot && wsStatusText) {
        if (connected) {
            wsStatusDot.className = 'w-2 h-2 bg-green-500 rounded-full animate-pulse';
            wsStatusText.textContent = 'WebSocket已连接';
        } else {
            wsStatusDot.className = 'w-2 h-2 bg-gray-500 rounded-full';
            wsStatusText.textContent = '未连接';
        }
    }
    
    if (onWsStatusChange) {
        onWsStatusChange(connected);
    }
}

/**
 * 初始化WebSocket连接（页面加载时调用）
 */
export async function initWebSocket() {
    try {
        await store.connectSignaling();
        updateWsStatus(true);
        console.log('WebSocket initialized from connectview');
    } catch (error) {
        console.error('Failed to initialize WebSocket:', error);
        updateWsStatus(false);
        showNotification('WebSocket连接失败，请刷新页面重试', 'error');
    }
}

/**
 * 获取所有连接ID
 */
async function getAllConnectionIds() {
    showNotification('正在获取连接ID列表...');
    try {
        const [connectionResponse, usersResponse] = await Promise.all([
            fetch('/signaling/connection-ids'),
            fetch('/signaling/users')
        ]);

        if (!connectionResponse.ok) {
            throw new Error('Failed to fetch connection IDs');
        }

        if (!usersResponse.ok) {
            throw new Error('Failed to fetch online users');
        }

        const connectionData = await connectionResponse.json();
        const usersData = await usersResponse.json();
        cachedOnlineUsers = Array.isArray(usersData.users) ? usersData.users : [];
        displayConnectionIds(connectionData.connectionIds || []);
        displayOnlineUsers(cachedOnlineUsers);
    } catch (error) {
        console.error('Error fetching connection IDs:', error);
        showNotification('获取连接信息失败', 'error');
    }
}

/**
 * 显示连接ID列表
 * @param {string[]} connectionIds - 连接ID数组
 */
function displayConnectionIds(connectionIds) {
    const idsContainer = document.getElementById('idsContainer');
    const connectionIdsList = document.getElementById('connectionIdsList');

    if (idsContainer) {
        idsContainer.innerHTML = '';

        if (connectionIds.length === 0) {
            idsContainer.innerHTML = '<p class="text-gray-500 text-sm">暂无可用的连接ID</p>';
        } else {
            connectionIds.forEach(id => {
                const idElement = document.createElement('div');
                idElement.className = 'flex items-center justify-between p-2 bg-white/5 rounded-lg hover:bg-white/10 cursor-pointer transition-colors';
                idElement.innerHTML = `
                    <span class="text-sm">${id}</span>
                    <button class="text-xs bg-indigo-600 hover:bg-indigo-700 px-2 py-1 rounded" onclick="selectConnectionId('${id}')">选择</button>
                `;
                idsContainer.appendChild(idElement);
            });
        }

        if (connectionIdsList) {
            connectionIdsList.classList.remove('hidden');
        }

        showNotification(`找到 ${connectionIds.length} 个连接ID`);
    }
}

/**
 * 转义HTML特殊字符
 * @param {string} value - 原始字符串
 * @returns {string} 安全字符串
 */
function escapeHtml(value) {
    return String(value || '')
        .replace(/&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;')
        .replace(/'/g, '&#39;');
}

/**
 * 按连接ID分组显示在线用户
 * @param {Array} users - 在线用户列表
 * @param {string} selectedConnectionId - 当前选中的连接ID
 */
function displayOnlineUsers(users, selectedConnectionId = '') {
    const onlineUsersList = document.getElementById('onlineUsersList');
    const usersContainer = document.getElementById('usersContainer');
    const onlineUsersSummary = document.getElementById('onlineUsersSummary');

    if (!onlineUsersList || !usersContainer || !onlineUsersSummary) {
        return;
    }

    const filteredUsers = selectedConnectionId
        ? users.filter(user => user.connectionId === selectedConnectionId)
        : users;

    onlineUsersSummary.textContent = selectedConnectionId
        ? `${filteredUsers.length} 人在线 · 房间 ${selectedConnectionId}`
        : `${filteredUsers.length} 人在线`;

    usersContainer.innerHTML = '';

    if (filteredUsers.length === 0) {
        usersContainer.innerHTML = '<p class="text-gray-500 text-sm">暂无在线用户</p>';
        onlineUsersList.classList.remove('hidden');
        return;
    }

    const groupedUsers = filteredUsers.reduce((groups, user) => {
        const connectionId = user.connectionId || 'unknown';
        if (!groups[connectionId]) {
            groups[connectionId] = [];
        }
        groups[connectionId].push(user);
        return groups;
    }, {});

    Object.entries(groupedUsers).forEach(([connectionId, roomUsers]) => {
        const section = document.createElement('div');
        section.className = 'rounded-lg border border-white/10 bg-white/5 p-3';

        const roomTitle = document.createElement('div');
        roomTitle.className = 'flex items-center justify-between mb-2';
        roomTitle.innerHTML = `
            <span class="text-sm font-medium text-white">${escapeHtml(connectionId)}</span>
            <span class="text-xs text-gray-400">${roomUsers.length} 人</span>
        `;
        section.appendChild(roomTitle);

        const roomList = document.createElement('div');
        roomList.className = 'space-y-2';

        roomUsers.forEach((user) => {
            const userName = user.name || user.userId || '匿名用户';
            const avatar = user.avatar || '/images/p2.png';
            const roleLabel = user.role === 'host' ? '房主' : '成员';
            const userItem = document.createElement('div');
            userItem.className = 'flex items-center justify-between rounded-lg bg-black/20 px-3 py-2';
            userItem.innerHTML = `
                <div class="flex items-center gap-3 min-w-0">
                    <img src="${escapeHtml(avatar)}" alt="${escapeHtml(userName)}" class="w-8 h-8 rounded-full object-cover">
                    <div class="min-w-0">
                        <div class="text-sm text-white truncate">${escapeHtml(userName)}</div>
                        <div class="text-xs text-gray-400 truncate">${escapeHtml(user.userId || user.participantId || '未设置ID')}</div>
                    </div>
                </div>
                <span class="text-xs px-2 py-1 rounded-full ${user.role === 'host' ? 'bg-indigo-500/20 text-indigo-300' : 'bg-white/10 text-gray-300'}">${roleLabel}</span>
            `;
            roomList.appendChild(userItem);
        });

        section.appendChild(roomList);
        usersContainer.appendChild(section);
    });

    onlineUsersList.classList.remove('hidden');
}

/**
 * 选择连接ID
 * @param {string} id - 连接ID
 */
function selectConnectionId(id) {
    const connectionIdInput = document.getElementById('connectionIdInput');
    if (connectionIdInput) {
        connectionIdInput.value = id;
        displayOnlineUsers(cachedOnlineUsers, id);
        showNotification(`已选择连接ID: ${id}`);
    }
}

/**
 * 生成8位用户ID
 * @returns {string} 用户ID
 */
function generateUserId() {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    let result = 'user_';
    for (let i = 0; i < 8; i++) {
        result += chars.charAt(Math.floor(Math.random() * chars.length));
    }
    return result;
}

/**
 * 加载用户设置
 */
export function loadUserSettings() {
    const defaultAvatar = '/images/p1.png';
    const userSettings = localStorage.getItem('userSettings');
    if (userSettings) {
        try {
            const settings = JSON.parse(userSettings);

            if (settings.userId) {
                const userIdInput = document.getElementById('userIdInput');
                if (userIdInput) userIdInput.value = settings.userId;
            }

            if (settings.name) {
                const nicknameInput = document.getElementById('nicknameInput');
                const userName = document.getElementById('userName');
                if (nicknameInput) nicknameInput.value = settings.name;
                if (userName) userName.textContent = settings.name;
            }

            const avatar = settings.avatar || defaultAvatar;
            const userAvatar = document.getElementById('userAvatar');
            const avatarPreview = document.getElementById('avatarPreview');
            if (userAvatar) userAvatar.src = avatar;
            if (avatarPreview) avatarPreview.src = avatar;
        } catch (error) {
            console.error('Error loading user settings:', error);
            const userAvatar = document.getElementById('userAvatar');
            const avatarPreview = document.getElementById('avatarPreview');
            if (userAvatar) userAvatar.src = defaultAvatar;
            if (avatarPreview) avatarPreview.src = defaultAvatar;
        }
    } else {
        const newUserId = generateUserId();
        const userIdInput = document.getElementById('userIdInput');
        if (userIdInput) userIdInput.value = newUserId;

        const userAvatar = document.getElementById('userAvatar');
        const avatarPreview = document.getElementById('avatarPreview');
        if (userAvatar) userAvatar.src = defaultAvatar;
        if (avatarPreview) avatarPreview.src = defaultAvatar;

        saveSettings();
    }
}

/**
 * 保存用户设置
 */
export function saveSettings() {
    const defaultAvatar = '/images/p1.png';
    const nicknameInput = document.getElementById('nicknameInput');
    const userIdInput = document.getElementById('userIdInput');
    const avatarPreview = document.getElementById('avatarPreview');
    const userName = document.getElementById('userName');
    const userAvatar = document.getElementById('userAvatar');

    const settings = {
        userId: userIdInput ? userIdInput.value : generateUserId(),
        name: nicknameInput ? (nicknameInput.value || '我') : '我',
        avatar: avatarPreview ? (avatarPreview.src || defaultAvatar) : defaultAvatar
    };

    localStorage.setItem('userSettings', JSON.stringify(settings));

    if (userName) userName.textContent = settings.name;
    if (userAvatar) userAvatar.src = settings.avatar;

    showNotification('设置已保存', 'success');
}

/**
 * 处理头像上传
 * @param {Event} event - 文件选择事件
 */
export function handleAvatarUpload(event) {
    const file = event.target.files[0];
    if (!file) return;

    if (!file.type.startsWith('image/')) {
        showNotification('请选择图片文件', 'error');
        return;
    }

    if (file.size > MAX_AVATAR_SIZE) {
        showNotification('图片大小不能超过2MB', 'error');
        return;
    }

    const formData = new FormData();
    formData.append('avatar', file);
    const userIdInput = document.getElementById('userIdInput');
    if (userIdInput) {
        formData.append('userId', userIdInput.value);
    }

    showNotification('正在上传头像...');

    fetch('/api/upload/avatar', {
        method: 'POST',
        body: formData
    })
    .then(response => {
        if (!response.ok) throw new Error('上传失败');
        return response.json();
    })
    .then(data => {
        if (data.success && data.avatarUrl) {
            const avatarUrl = data.avatarUrl;
            const avatarPreview = document.getElementById('avatarPreview');
            const userAvatar = document.getElementById('userAvatar');
            if (avatarPreview) avatarPreview.src = avatarUrl;
            if (userAvatar) userAvatar.src = avatarUrl;
            saveSettings();
            showNotification('头像上传成功', 'success');
        } else {
            throw new Error('上传失败：' + (data.message || '未知错误'));
        }
    })
    .catch(error => {
        console.error('Error uploading avatar:', error);
        showNotification('头像上传失败，请重试', 'error');
        const defaultAvatar = '/images/p1.png';
        const avatarPreview = document.getElementById('avatarPreview');
        if (avatarPreview) avatarPreview.src = defaultAvatar;
    });
}

/**
 * 复制用户ID到剪贴板
 */
export function copyUserId() {
    const userIdInput = document.getElementById('userIdInput');
    if (userIdInput) {
        userIdInput.select();
        document.execCommand('copy');
        showNotification('用户ID已复制到剪贴板', 'success');
    }
}

/**
 * 切换设置菜单
 */
export function toggleSettingsMenu() {
    const settingsMenu = document.getElementById('settingsMenu');
    if (settingsMenu) {
        settingsMenu.classList.toggle('hidden');
    }
}

/**
 * 绑定connect视图事件
 * @param {function} onJoinCall - 加入通话回调(connectionId: string)
 * @param {function} onCreateCall - 创建通话回调()
 */
export function bindConnectViewEvents(onJoinCall, onCreateCall) {
    // 加入通话按钮
    const connectBtn = document.getElementById('connectBtn');
    if (connectBtn) {
        connectBtn.addEventListener('click', () => {
            const connectionIdInput = document.getElementById('connectionIdInput');
            const connectionId = connectionIdInput ? connectionIdInput.value.trim() : '';
            if (connectionId) {
                onJoinCall(connectionId);
            } else {
                showNotification('请输入连接ID', 'error');
            }
        });
    }

    // 创建通话按钮
    const createCallBtn = document.getElementById('createCallBtn');
    if (createCallBtn) {
        createCallBtn.addEventListener('click', onCreateCall);
    }

    // 浏览全部ID按钮
    const browseIdsBtn = document.getElementById('browseIdsBtn');
    if (browseIdsBtn) {
        browseIdsBtn.addEventListener('click', getAllConnectionIds);
    }

    // 输入框回车事件
    const connectionIdInput = document.getElementById('connectionIdInput');
    if (connectionIdInput) {
        connectionIdInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') {
                const connectionId = connectionIdInput.value.trim();
                if (connectionId) {
                    onJoinCall(connectionId);
                } else {
                    showNotification('请输入连接ID', 'error');
                }
            }
        });
    }

    // 用户设置按钮
    const userSettingsBtn = document.getElementById('userSettingsBtn');
    if (userSettingsBtn) {
        userSettingsBtn.addEventListener('click', toggleSettingsMenu);
    }
}

// 点击外部关闭设置菜单
document.addEventListener('click', function(event) {
    const settingsMenu = document.getElementById('settingsMenu');
    const userSettingsBtn = document.getElementById('userSettingsBtn');
    
    if (settingsMenu && userSettingsBtn &&
        !settingsMenu.contains(event.target) &&
        !userSettingsBtn.contains(event.target)) {
        settingsMenu.classList.add('hidden');
    }
});

// 导出全局函数（供HTML onclick使用）
window.selectConnectionId = selectConnectionId;
window.saveSettings = saveSettings;
window.handleAvatarUpload = handleAvatarUpload;
window.copyUserId = copyUserId;
window.toggleSettingsMenu = toggleSettingsMenu;