/**
 * UI渲染器
 * 负责将状态映射到DOM，与状态管理解耦
 */
import { formatTime, formatTimestamp, toggleElement, toggleButtonState } from './utils.js';
import {mockCallSession } from './models.js';
class UIRenderer {
    constructor(stateManager) {
        this.stateManager = stateManager;
        this.unsubscribe = stateManager.subscribe(this.render.bind(this));

        // 缓存 DOM 元素
        this.elements = {
            // 头部和底部
            header: document.querySelector('header'),
            footer: document.querySelector('footer'),
            // 头部内容
            headerTitle: document.getElementById('headerTitle'),
            callDuration: document.getElementById('callDuration'),
            encryptionBadge: document.getElementById('encryptionBadge'),
            unreadBadge: document.getElementById('unreadBadge'),

            // 远端视频
            remoteVideo: document.getElementById('remoteVideo'),
            remoteAvatar: document.getElementById('remoteAvatar'),
            remoteName: document.getElementById('remoteName'),
            remoteStatus: document.getElementById('remoteStatus'),
            remoteSpeakingIndicator: document.getElementById('remoteSpeakingIndicator'),
            remoteAudioWave: document.getElementById('remoteAudioWave'),
            networkStatus: document.getElementById('networkStatus'),
            networkStatusText: document.getElementById('networkStatusText'),
            connectingOverlay: document.getElementById('connectingOverlay'),

            // 本地视频
            localVideo: document.getElementById('localVideo'),
            localVideoPlaceholder: document.getElementById('localVideoPlaceholder'),
            localAudioWave: document.getElementById('localAudioWave'),
            localInitials: document.getElementById('localInitials'),

            // 侧边栏
            sidebar: document.getElementById('sidebar'),
            chatContent: document.getElementById('chatContent'),
            userList: document.getElementById('userList'),
            localMediaStatus: document.getElementById('localMediaStatus'),
            localMuteIcon: document.querySelector('[data-field="localUser.muteIcon"]'),
            // 控制按钮
            micBtn: document.getElementById('micBtn'),
            videoBtn: document.getElementById('videoBtn'),
            recordBtn: document.getElementById('recordBtn'),
            connectionQuality: document.getElementById('connectionQuality')
        };

        // 绑定事件监听器
        this.bindEventListeners();

        // 订阅状态变化
        this.unsubscribe = stateManager.subscribe(this.render.bind(this));
        // 初始化渲染
        this.render(this.stateManager.getState(), { type: 'INIT' });
    }

    // 绑定事件监听器
    bindEventListeners() {
        // 事件监听器
    }


    // 渲染状态变化
    render(state, changes) {
        switch (changes.type) {
            case 'INIT':
                this.renderHeader(state.session);
                this.renderRemoteVideo(state.session.remoteUser);
                this.renderLocalVideo(state.session.localUser, state.localStream);
                this.renderControlButtons(state.session.localUser.mediaState);
                this.renderChatMessages(state.messages);
                this.renderUserList(state.session.localUser, state.session.remoteUser);
                break;
            case 'DURATION_UPDATE':
                this.renderCallDuration(changes.duration);
                break;
            case 'LOCAL_MEDIA_CHANGE':
                this.renderControlButtons(state.session.localUser.mediaState);
                this.renderLocalVideo(state.session.localUser, state.localStream);
                this.renderLocalUserStatus(state.session.localUser);
                this.renderUserList(state.session.localUser, state.session.remoteUser);
                break;
            case 'LOCAL_STREAM_OBTAINED':
                this.renderLocalStream(state.localStream);
                this.renderLocalVideo(state.session.localUser, state.localStream);
                break;
            case 'REMOTE_MEDIA_CHANGE':
                this.renderRemoteVideo(state.session.remoteUser);
                this.renderUserList(state.session.localUser, state.session.remoteUser);
                break;
            case 'NEW_MESSAGE':
                this.renderChatMessages(state.messages);
                this.renderUnreadCount(changes.unreadCount);
                break;
            case 'SIDEBAR_TOGGLE':
                this.renderSidebar(changes.isOpen);
                break;
            case 'NETWORK_CHANGE':
                this.renderNetworkStatus(changes.quality);
                break;
            case 'CALL_ENDED':
                this.renderCallEnded();
                break;
        }
    }

    // 渲染头部
    renderHeader(session) {
        if (this.elements.headerTitle) {
            this.elements.headerTitle.textContent = `与 ${session.remoteUser.name} 的通话`;
        }

        if (this.elements.encryptionBadge) {
            toggleElement(this.elements.encryptionBadge, session.isEncrypted);
        }

        this.renderCallDuration(session.duration);
    }

    // 渲染通话时长
    renderCallDuration(duration) {
        if (this.elements.callDuration) {
            this.elements.callDuration.textContent = formatTime(duration);
        }
    }

    // 渲染远端视频
    renderRemoteVideo(remoteUser) {
        if (this.elements.remoteName) {
            this.elements.remoteName.textContent = remoteUser.name;
        }

        if (this.elements.remoteAvatar) {
            this.elements.remoteAvatar.src = remoteUser.avatar;
        }

        if (this.elements.remoteStatus) {
            this.elements.remoteStatus.textContent = this.getStatusText(remoteUser.status);
        }

        // 渲染说话状态
        if (this.elements.remoteSpeakingIndicator) {
            toggleElement(this.elements.remoteSpeakingIndicator, remoteUser.mediaState.isSpeaking);
        }

        if (this.elements.remoteAudioWave) {
            toggleElement(this.elements.remoteAudioWave, remoteUser.mediaState.isSpeaking && remoteUser.mediaState.audio);
        }

        // 渲染网络状态
        this.renderNetworkStatus(remoteUser.networkQuality);
    }

    // 渲染本地视频
    renderLocalVideo(localUser, localStream) {
        if (this.elements.localVideoPlaceholder) {
            // 当没有视频流或视频关闭时显示占位符
            const shouldShowPlaceholder = !localStream || !localUser.mediaState.video;
            toggleElement(this.elements.localVideoPlaceholder, shouldShowPlaceholder);
        }

        if (this.elements.localAudioWave) {
            toggleElement(this.elements.localAudioWave, localUser.mediaState.isSpeaking);
        }

        // 同时渲染本地用户状态
        this.renderLocalUserStatus(localUser);
    }

    // 渲染本地视频流
    renderLocalStream(stream) {
        if (this.elements.localVideo && stream) {
            this.elements.localVideo.srcObject = stream;
            this.elements.localVideo.autoplay = true;
            this.elements.localVideo.muted = true; // 本地视频静音，避免回声
            console.log('srcObject set successfully:', this.elements.localVideo.srcObject);

            // 隐藏断开连接覆盖层
            if (this.elements.disconnectedOverlay) {
                this.elements.disconnectedOverlay.classList.add('hidden');
            }
        } else {
            console.error('Either localVideo element or stream is missing');
        }
    }

    // 渲染本地用户状态
    renderLocalUserStatus(localUser) {
        // 更新本地媒体状态文本
        if (this.elements.localMediaStatus) {
            if (!localUser.mediaState.audio) {
                this.elements.localMediaStatus.textContent = '静音中';
                this.elements.localMediaStatus.className = 'text-xs text-gray-500';
            } else if (!localUser.mediaState.video) {
                this.elements.localMediaStatus.textContent = '视频关闭';
                this.elements.localMediaStatus.className = 'text-xs text-gray-500';
            } else {
                this.elements.localMediaStatus.textContent = '在线';
                this.elements.localMediaStatus.className = 'text-xs text-green-400';
            }
        }

        // 更新静音图标
        if (this.elements.localMuteIcon) {
            if (!localUser.mediaState.audio) {
                this.elements.localMuteIcon.classList.remove('hidden');
                this.elements.localMuteIcon.className = 'fas fa-microphone-slash text-gray-500 text-xs';
            } else {
                this.elements.localMuteIcon.classList.add('hidden');
            }
        }
    }

    // 渲染侧边栏用户列表
    renderUserList(localUser, remoteUser) {
        if (!this.elements.userList) return;

        // 渲染本地用户
        const localUserElement = this.elements.userList.querySelector('[data-user-id="local"]');
        if (localUserElement) {
            // 渲染本地用户头像
            const localAvatar = localUserElement.querySelector('img[data-field="localUser.avatar"]');
            if (localAvatar) {
                localAvatar.src = localUser.avatar;
            }
            // 渲染本地用户名字
            const localName = localUserElement.querySelector('[data-field="localUser.name"]');
            if (localName) {
                localName.textContent = localUser.name;
            }
        }

        // 渲染远程用户
        const remoteUserElement = this.elements.userList.querySelector('[data-user-id="remote"]');
        if (remoteUserElement) {
            // 渲染远程用户头像
            const remoteAvatar = remoteUserElement.querySelector('img[data-field="remoteUser.avatar"]');
            if (remoteAvatar) {
                remoteAvatar.src = remoteUser.avatar;
            }
            // 渲染远程用户名字
            const remoteName = remoteUserElement.querySelector('[data-field="remoteUser.name"]');
            if (remoteName) {
                remoteName.textContent = remoteUser.name;
            }
        }
    }

    // 渲染控制按钮
    renderControlButtons(mediaState) {
        if (this.elements.micBtn) {
            toggleButtonState(this.elements.micBtn, !mediaState.audio);
        }

        if (this.elements.videoBtn) {
            toggleButtonState(this.elements.videoBtn, !mediaState.video);
        }

        if (this.elements.recordBtn) {
            toggleButtonState(this.elements.recordBtn, mediaState.recording);
        }
    }

    // 渲染聊天消息
    renderChatMessages(messages) {
        if (!this.elements.chatContent) return;

        // 清空聊天内容
        this.elements.chatContent.innerHTML = '';

        // 添加通话开始时间
        const startTimeElement = document.createElement('div');
        startTimeElement.className = 'text-center text-xs text-gray-500 my-4';
        const startTime = messages[0]?.timestamp || new Date().toISOString();
        startTimeElement.textContent = `通话开始 ${formatTimestamp(startTime)}`;
        this.elements.chatContent.appendChild(startTimeElement);

        // 添加消息
        messages.forEach(message => {
            const messageElement = this.createMessageElement(message);
            this.elements.chatContent.appendChild(messageElement);
        });

        // 滚动到底部
        this.elements.chatContent.scrollTop = this.elements.chatContent.scrollHeight;
    }

    // 创建消息元素
    createMessageElement(message) {
        const messageDiv = document.createElement('div');

        // 根据消息类型设置不同的CSS类
        let messageClass = 'chat-bubble';
        if (message.type === 'system') {
            messageClass += ' message-system';
        } else if (message.isSelf) {
            messageClass += ' message-self';
        } else {
            messageClass += ' message-other';
        }

        messageDiv.className = messageClass;
        messageDiv.dataset.messageId = message.id;

        let contentHTML = '';
        if (message.type === 'file' && message.content.startsWith('data:image/')) {
            // 图片消息
            contentHTML = `
                <div class="message-image-container">
                    <img src="${message.content}" class="message-image" alt="${message.fileName || '图片'}">
                    ${message.fileName ? `<div class="message-image-name">${message.fileName}</div>` : ''}
                </div>
            `;
        } else {
            // 文本消息
            contentHTML = `
                <div class="message-text">
                    ${message.content}
                </div>
            `;
        }

        messageDiv.innerHTML = `
            <div class="message-header">
                <img src="${message.senderAvatar}" class="message-avatar">
                <div>
                    <span class="message-sender">${message.senderName}</span>
                    <span class="message-time">${formatTimestamp(message.timestamp)}</span>
                </div>
            </div>
            <div class="message-content">
                ${contentHTML}
            </div>
        `;

        return messageDiv;
    }

    // 渲染未读消息数
    renderUnreadCount(count) {
        if (this.elements.unreadBadge) {
            if (count > 0) {
                this.elements.unreadBadge.textContent = count;
                this.elements.unreadBadge.classList.remove('hidden');
            } else {
                this.elements.unreadBadge.classList.add('hidden');
            }
        }
    }

    // 渲染侧边栏
    renderSidebar(isOpen) {
        if (this.elements.sidebar) {
            if (isOpen) {
                this.elements.sidebar.classList.remove('hidden');
            } else {
                this.elements.sidebar.classList.add('hidden');
            }
        }
    }

    // 渲染网络状态
    renderNetworkStatus(quality) {
        if (this.elements.networkStatus && this.elements.networkStatusText) {
            const showNetworkStatus = quality !== 'excellent';
            toggleElement(this.elements.networkStatus, showNetworkStatus);

            if (showNetworkStatus) {
                this.elements.networkStatusText.textContent = this.getNetworkQualityText(quality);
            }
        }

        if (this.elements.connectionQuality) {
            this.elements.connectionQuality.textContent = `连接质量: ${this.getNetworkQualityText(quality)}`;
        }
    }

    // 渲染通话结束
    renderCallEnded() {
        console.log('Call ended');
        // 跳转到结束通话界面
        window.location.href = './endcall/endcall.html';
    }

    // 获取状态文本
    getStatusText(status) {
        const statusMap = {
            'online': '在线',
            'offline': '离线',
            'connecting': '连接中'
        };
        return statusMap[status] || status;
    }

    // 获取网络质量文本
    getNetworkQualityText(quality) {
        const qualityMap = {
            'excellent': '优秀',
            'good': '良好',
            'fair': '一般',
            'poor': '较差'
        };
        return qualityMap[quality] || quality;
    }

    // 销毁
    destroy() {
        if (this.unsubscribe) {
            this.unsubscribe();
        }
    }
}

export default UIRenderer;