/**
 * 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'),
            remoteVideoPlaceholder: document.getElementById('remoteVideoPlaceholder'),
            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' });

        window.addEventListener('resize', () => {
            if (this.elements.remoteVideo && this.elements.remoteVideo.srcObject) {
                const stream = this.elements.remoteVideo.srcObject;
                const videoTracks = stream.getVideoTracks();
                if (videoTracks.length > 0) {
                    const resolution = this.getVideoResolution(videoTracks[0]);
                    this.adjustVideoSize(this.elements.remoteVideo, resolution);
                }
            }
        });
    }

    // 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);

                // 初始化时检查远程流状态，显示或隐藏占位背景
                if (this.elements.remoteVideoPlaceholder) {
                    if (state.remoteStream) {
                        this.elements.remoteVideoPlaceholder.classList.add('hidden');
                    } else {
                        this.elements.remoteVideoPlaceholder.classList.remove('hidden');
                    }
                }
                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_STREAM_OBTAINED':
                this.renderRemoteStream(state.remoteStream);
                // 当获取到远程流时，隐藏连接中提示
                if (this.elements.connectingOverlay) {
                    this.elements.connectingOverlay.classList.add('hidden');
                }
                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_STATUS_CHANGE':
                this.renderCallStatus(changes.status);
                break;
            case 'CALL_ENDED':
                this.renderCallEnded();
                break;
        }
    }

    // 渲染通话状态
    renderCallStatus(status) {
        if (this.elements.connectingOverlay) {
            if (status === 'connecting') {
                this.elements.connectingOverlay.classList.remove('hidden');
            } else {
                this.elements.connectingOverlay.classList.add('hidden');
            }
        }
    }

    // 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');
        }
    }

    // 渲染远程视频流
    renderRemoteStream(stream) {
        if (this.elements.remoteVideo && stream) {
            console.log('Rendering remote stream:', stream);

            // 即使流对象相同，也要重新设置，确保视频元素能够识别轨道变化
            this.elements.remoteVideo.srcObject = null;

            // 延迟设置srcObject，确保视频元素能够正确处理
            setTimeout(() => {
                this.elements.remoteVideo.srcObject = stream;
                console.log('Remote stream reset successfully:', stream);

                // 确保视频元素的属性正确设置
                this.elements.remoteVideo.autoplay = true;
                this.elements.remoteVideo.playsinline = true;
                this.elements.remoteVideo.muted = true;

                // 关键设置：启用硬件加速和最佳质量渲染
                this.elements.remoteVideo.style.transform = 'translateZ(0)'; // 启用硬件加速
                this.elements.remoteVideo.style.imageRendering = 'pixelated'; // 保持像素清晰
                this.elements.remoteVideo.style.objectFit = 'contain'; // 保持比例

                // 隐藏断开连接覆盖层
                if (this.elements.disconnectedOverlay) {
                    this.elements.disconnectedOverlay.classList.add('hidden');
                }

                // 隐藏占位背景
                if (this.elements.remoteVideoPlaceholder) {
                    this.elements.remoteVideoPlaceholder.classList.add('hidden');
                }

                // 获取视频轨道并处理分辨率
                const videoTracks = stream.getVideoTracks();
                console.log('Remote video tracks:', videoTracks);

                // 检查是否有有效的视频轨道
                const hasValidVideoTrack = videoTracks.length > 0 && videoTracks.some(track => {
                    // 检查轨道是否已停止或被禁用
                    return track.readyState === 'live';
                });

                console.log('Has valid video track:', hasValidVideoTrack);

                if (hasValidVideoTrack) {
                    console.log('Found valid video tracks, updating resolution');
                    const activeVideoTrack = videoTracks.find(track => track.readyState === 'live');
                    if (activeVideoTrack) {
                        const resolution = this.getVideoResolution(activeVideoTrack);
                        this.adjustVideoSize(this.elements.remoteVideo, resolution);

                        // 监听轨道变化，处理分辨率调整
                        activeVideoTrack.addEventListener('resize', () => {
                            const newResolution = this.getVideoResolution(activeVideoTrack);
                            this.adjustVideoSize(this.elements.remoteVideo, newResolution);
                        });
                    }
                } else {
                    console.log('No valid video tracks in remote stream');
                    // 清空视频元素的源
                    this.elements.remoteVideo.srcObject = null;

                    // 显示占位背景
                    if (this.elements.remoteVideoPlaceholder) {
                        this.elements.remoteVideoPlaceholder.classList.remove('hidden');
                    }
                }
            }, 50); // 增加延迟时间，确保视频元素有足够的时间处理
        } else {
            console.error('Either remoteVideo element or stream is missing');

            // 清空视频元素的源
            if (this.elements.remoteVideo) {
                this.elements.remoteVideo.srcObject = null;
            }

            // 显示占位背景
            if (this.elements.remoteVideoPlaceholder) {
                this.elements.remoteVideoPlaceholder.classList.remove('hidden');
            }
        }
    }

    // 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;
            }
        }
    }
    // 在renderer.js中添加方法
    // 获取视频流分辨率
    getVideoResolution(track) {
        if (track && track.getSettings) {
            const settings = track.getSettings();
            return {
                width: settings.width || 640,
                height: settings.height || 480
            };
        }
        return { width: 640, height: 480 }; // 默认值
    }

    // 调整视频元素大小并居中显示
    adjustVideoSize(videoElement, resolution) {
        if (!videoElement) return;

        const { width, height } = resolution;
        const aspectRatio = width / height;

        // 根据容器大小和视频宽高比调整视频显示
        const container = videoElement.parentElement;
        const containerWidth = container.clientWidth;
        const containerHeight = container.clientHeight;
        // 启用硬件加速
        videoElement.style.transform = 'translateZ(0)';
        videoElement.style.willChange = 'transform';
        // 设置容器为flex布局，使视频居中
        container.style.display = 'flex';
        container.style.alignItems = 'center';
        container.style.justifyContent = 'center';
        // 优化图像渲染
        videoElement.style.imageRendering = 'pixelated';
        // 确保视频元素在容器内正确显示
        videoElement.style.maxWidth = '100%';
        videoElement.style.maxHeight = '100%';
        videoElement.style.objectFit = 'contain';
    }
    // 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) {
            // 始终显示网络状态
            toggleElement(this.elements.networkStatus, true);

            // 根据网络质量设置不同的图标和颜色
            const networkStatus = this.elements.networkStatus;
            const networkStatusText = this.elements.networkStatusText;

            // 清除之前的图标
            const existingIcon = networkStatus.querySelector('i');
            if (existingIcon) {
                existingIcon.remove();
            }

            // 创建新的图标元素
            const icon = document.createElement('i');

            // 根据网络质量设置图标和样式
            switch (quality) {
                case 'excellent':
                    icon.className = 'fas fa-check-circle text-green-400';
                    networkStatusText.textContent = this.getNetworkQualityText(quality);
                    networkStatusText.className = 'text-green-400';
                    break;
                case 'good':
                    icon.className = 'fas fa-signal text-blue-400';
                    networkStatusText.textContent = this.getNetworkQualityText(quality);
                    networkStatusText.className = 'text-blue-400';
                    break;
                case 'fair':
                    icon.className = 'fas fa-exclamation-circle text-yellow-500';
                    networkStatusText.textContent = this.getNetworkQualityText(quality);
                    networkStatusText.className = 'text-yellow-500';
                    break;
                case 'poor':
                    icon.className = 'fas fa-exclamation-triangle text-red-500';
                    networkStatusText.textContent = this.getNetworkQualityText(quality);
                    networkStatusText.className = 'text-red-500';
                    break;
                default:
                    icon.className = 'fas fa-question-circle text-gray-400';
                    networkStatusText.textContent = '未知';
                    networkStatusText.className = 'text-gray-400';
            }

            // 添加图标到网络状态元素
            networkStatus.insertBefore(icon, networkStatusText);
        }

        if (this.elements.connectionQuality) {
            const qualityText = this.getNetworkQualityText(quality);
            let statusClass = '';

            // 根据网络质量设置文本颜色
            switch (quality) {
                case 'excellent':
                    statusClass = 'text-green-400';
                    break;
                case 'good':
                    statusClass = 'text-blue-400';
                    break;
                case 'fair':
                    statusClass = 'text-yellow-500';
                    break;
                case 'poor':
                    statusClass = 'text-red-500';
                    break;
                default:
                    statusClass = 'text-gray-400';
            }

            // 更新连接质量文本和样式
            this.elements.connectionQuality.textContent = `连接质量: ${qualityText}`;
            this.elements.connectionQuality.className = `text-xs ${statusClass}`;
        }
    }

    // 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;