class UpdateHistory extends HTMLElement {
    constructor() {
        super();
        this.attachShadow({ mode: 'open' });
        this.versions = [];
        this.accessLevel = 0;
        this.currentPage = 1;
        this.pageSize = 10;
        this.totalPages = 1;
    }

    connectedCallback() {
        this.render();
        this.loadData();
        this.checkUserAccess();
    }

    // 检查用户权限
    async checkUserAccess() {
        try {
            // 从localStorage获取用户信息
            const userInfo = localStorage.getItem('userInfo');
            
            if (userInfo) {
                try {
                    const user = JSON.parse(userInfo);
                    this.accessLevel = user.access_level || 0;
                } catch (parseError) {
                    console.error('解析用户信息失败:', parseError);
                    this.accessLevel = 0;
                }
            } else {
                this.accessLevel = 0;
            }
            
            this.updateAddButton();
        } catch (error) {
            console.error('获取用户权限失败:', error);
            this.accessLevel = 0;
            this.updateAddButton();
        }
    }

    // 更新添加按钮显示状态
    updateAddButton() {
        const addButton = this.shadowRoot.querySelector('#addVersionBtn');
        if (addButton) {
            addButton.style.display = this.accessLevel >= 2 ? 'flex' : 'none';
        }
    }

    async loadData() {
        try {
            const response = await fetch('/api/versions');
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }
            const data = await response.json();
            
            // 按版本号降序排序，然后按日期降序
            this.versions = data.sort((a, b) => {
                const versionA = parseFloat(a.verNum);
                const versionB = parseFloat(b.verNum);
                if (versionA !== versionB) {
                    return versionB - versionA;
                }
                const dateA = new Date(a.date + ' ' + a.time);
                const dateB = new Date(b.date + ' ' + b.time);
                return dateB - dateA;
            });
            
            this.renderVersions();
        } catch (error) {
            console.error('加载版本信息失败:', error);
            this.showError();
        }
    }

    renderVersions() {
        const contentContainer = this.shadowRoot.querySelector('#content');
        
        if (this.versions.length === 0) {
            contentContainer.innerHTML = '<div class="error">暂无更新记录</div>';
            return;
        }
        
        this.totalPages = Math.ceil(this.versions.length / this.pageSize);
        const startIndex = (this.currentPage - 1) * this.pageSize;
        const endIndex = Math.min(startIndex + this.pageSize, this.versions.length);
        const currentPageVersions = this.versions.slice(startIndex, endIndex);
        
        let html = `
            <div class="version-list">
                ${currentPageVersions.map(version => `
                    <div class="version-item" data-version="${version.verNum}">
                        <div class="version-header">
                            <div class="version-info">
                                <span class="version-number">v${version.verNum}</span>
                                <span class="version-title">${version.title}</span>
                                <span class="version-date">${version.date} ${version.time}</span>
                                <span class="version-author">作者: ${version.author || '未知用户'}</span>
                            </div>
                            ${version.note ? `
                                <button class="expand-btn" aria-label="展开详情">
                                    <img src="assets/icons/png/chevron-down_b.png" alt="展开">
                                </button>
                            ` : ''}
                        </div>
                        ${version.note ? `
                            <div class="version-description">${version.note}</div>
                        ` : ''}
                    </div>
                `).join('')}
            </div>
            <div class="pagination">
                <button class="pagination-btn" id="prevPage" ${this.currentPage === 1 ? 'disabled' : ''}>
                    上一页
                </button>
                <span class="page-info">第 ${this.currentPage} 页 / 共 ${this.totalPages} 页</span>
                <button class="pagination-btn" id="nextPage" ${this.currentPage === this.totalPages ? 'disabled' : ''}>
                    下一页
                </button>
            </div>
        `;

        contentContainer.innerHTML = html;

        // 添加展开/收起事件
        this.addExpandListeners();
        
        // 更新添加按钮显示状态
        this.updateAddButton();
        
        // 添加分页按钮事件监听
        this.addPaginationListeners();
    }
    
    addExpandListeners() {
        const expandButtons = this.shadowRoot.querySelectorAll('.expand-btn');
        
        expandButtons.forEach((button, index) => {
            
            // 移除旧事件（如果有）
            button.removeEventListener('click', this.onButtonClick);
            
            // 添加新事件
            button.addEventListener('click', (e) => {
                const versionItem = button.closest('.version-item');
                const description = versionItem.querySelector('.version-description');
                
                // 切换显示/隐藏状态
                description.classList.toggle('show');
                
                // 更新按钮状态
                button.classList.toggle('expanded');
                
                // 更新按钮文本和图标
                const img = button.querySelector('img');
                if (description.classList.contains('show')) {
                    button.setAttribute('aria-label', '收起详情');
                    img.alt = '收起';
                } else {
                    button.setAttribute('aria-label', '展开详情');
                    img.alt = '展开';
                }
            });
        });
    }
    
    showError() {
        const contentContainer = this.shadowRoot.querySelector('#content');
        contentContainer.innerHTML = '<div class="error">加载失败，请稍后重试</div>';
    }

    render() {
        this.shadowRoot.innerHTML = `
            <style>
                :host {
                    display: block;
                    padding: 20px;
                    max-width: 1200px;
                    margin: 0 auto;
                }
                
                .container {
                    background: white;
                    border-radius: 12px;
                    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
                    padding: 25px;
                    position: relative;
                    overflow: visible;
                    min-height: 200px;
                }
                
                .title-container {
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                    margin-bottom: 25px;
                    padding-bottom: 15px;
                    border-bottom: 2px solid #eee;
                }
                
                .title {
                    font-size: 24px;
                    color: #2c3e50;
                    margin: 0;
                }
                
                #addVersionBtn {
                    background: linear-gradient(135deg, #667eea, #764ba2);
                    color: white;
                    border: none;
                    border-radius: 6px;
                    padding: 8px 16px;
                    font-size: 14px;
                    cursor: pointer;
                    display: flex;
                    align-items: center;
                    gap: 6px;
                    transition: all 0.3s ease;
                    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
                    position: absolute;
                    right: 30px;
                    top: 30px;
                }
                
                #addVersionBtn:hover {
                    transform: translateY(-2px);
                    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
                }
                
                #addVersionBtn img {
                    width: 16px;
                    height: 16px;
                }
                
                .version-list {
                    position: relative;
                    padding-left: 30px;
                    margin-bottom: 25px;
                }
                
                .version-item {
                    position: relative;
                    margin-bottom: 30px;
                }
                
                .version-item:last-child {
                    margin-bottom: 0;
                }
                
                .version-item::before {
                    content: '';
                    position: absolute;
                    left: -30px;
                    top: 0;
                    width: 16px;
                    height: 16px;
                    border-radius: 50%;
                    background: #667eea;
                    border: 3px solid white;
                    box-shadow: 0 0 0 2px #667eea;
                }
                
                .version-item::after {
                    content: '';
                    position: absolute;
                    left: -23px;
                    top: 20px;
                    bottom: -30px;
                    width: 2px;
                    background: #e2e8f0;
                }
                
                .version-item:last-child::after {
                    display: none;
                }
                
                .version-header {
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                    margin-bottom: 10px;
                }
                
                .version-info {
                    display: flex;
                    align-items: center;
                    line-height: 1;
                }
                
                .version-number {
                    font-size: 18px;
                    font-weight: bold;
                    color: #667eea;
                    margin-right: 15px;
                    display: inline-flex;
                    align-items: center;
                }
                
                .version-title {
                    font-size: 16px;
                    font-weight: 500;
                    color: #2d3748;
                    margin-right: 15px;
                    display: inline-flex;
                    align-items: center;
                }
                
                .version-date {
                    color: #718096;
                    font-size: 14px;
                    display: inline-flex;
                    align-items: center;
                }
                
                .version-author {
                    color: #718096;
                    font-size: 14px;
                    display: inline-flex;
                    align-items: center;
                    margin-left: 15px;
                }
                
                .expand-btn {
                    background: none;
                    border: none;
                    cursor: pointer;
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    width: 30px;
                    height: 30px;
                    border-radius: 50%;
                    transition: background-color 0.3s;
                    padding: 0;
                    margin: 0;
                }
                
                .expand-btn:hover {
                    background-color: rgba(0, 0, 0, 0.05);
                }
                
                .expand-btn img {
                    width: 20px;
                    height: 20px;
                    transition: transform 0.3s;
                }
                
                .expand-btn.expanded img {
                    transform: rotate(180deg);
                }
                
                .version-description {
                    display: none;
                    padding: 10px 15px;
                    background-color: #f8f9fa;
                    border-radius: 8px;
                    margin-top: 10px;
                    color: #4a5568;
                    line-height: 1.6;
                }
                
                .version-description.show {
                    display: block;
                }
                
                .loading {
                    text-align: center;
                    padding: 40px;
                    color: #718096;
                }
                
                .error {
                    text-align: center;
                    padding: 40px;
                    color: #e53e3e;
                }
                
                /* 对话框样式 */
                .modal-overlay {
                    position: fixed;
                    top: 0;
                    left: 0;
                    right: 0;
                    bottom: 0;
                    background-color: rgba(0, 0, 0, 0.5);
                    display: flex;
                    align-items: center;
                    justify-content: center;
                    z-index: 1000;
                    display: none;
                }
                
                .modal-overlay.active {
                    display: flex;
                }
                
                .modal {
                    background-color: white;
                    border-radius: 12px;
                    padding: 24px;
                    width: 500px;
                    max-width: 90%;
                    max-height: 90vh;
                    overflow-y: auto;
                    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
                }
                
                .modal-header {
                    display: flex;
                    justify-content: space-between;
                    align-items: center;
                    margin-bottom: 16px;
                }
                
                .modal-title {
                    font-size: 20px;
                    font-weight: bold;
                    color: #2c3e50;
                    margin: 0;
                }
                
                .close-btn {
                    background: none;
                    border: none;
                    font-size: 24px;
                    cursor: pointer;
                    color: #718096;
                    line-height: 1;
                    padding: 0;
                }
                
                .form-group {
                    margin-bottom: 16px;
                }
                
                .form-group label {
                    display: block;
                    margin-bottom: 8px;
                    font-weight: 500;
                    color: #2d3748;
                }
                
                .form-control {
                    width: 100%;
                    padding: 10px 12px;
                    border: 1px solid #ddd;
                    border-radius: 6px;
                    font-size: 15px;
                    transition: border-color 0.3s;
                    box-sizing: border-box;
                }
                
                .form-control:focus {
                    border-color: #667eea;
                    outline: none;
                }
                
                .form-control:disabled {
                    background-color: #f8f9fa;
                }
                
                textarea.form-control {
                    min-height: 120px;
                    resize: vertical;
                }
                
                .modal-footer {
                    display: flex;
                    justify-content: flex-end;
                    gap: 12px;
                    margin-top: 24px;
                }
                
                .btn {
                    padding: 10px 16px;
                    border-radius: 6px;
                    font-size: 15px;
                    cursor: pointer;
                    transition: all 0.3s;
                }
                
                .btn-secondary {
                    background-color: #f8f9fa;
                    border: 1px solid #ddd;
                    color: #718096;
                }
                
                .btn-secondary:hover {
                    background-color: #edf2f7;
                }
                
                .btn-primary {
                    background: linear-gradient(135deg, #667eea, #764ba2);
                    border: none;
                    color: white;
                }
                
                .btn-primary:hover {
                    opacity: 0.9;
                    transform: translateY(-1px);
                }
                
                /* 分页样式 */
                .pagination {
                    display: flex;
                    justify-content: center;
                    align-items: center;
                    margin-top: 30px;
                    gap: 15px;
                    padding: 15px 0;
                }
                
                .pagination-btn {
                    padding: 8px 16px;
                    border: 1px solid #ddd;
                    border-radius: 6px;
                    background-color: white;
                    color: #2d3748;
                    cursor: pointer;
                    transition: all 0.3s ease;
                    min-width: 80px;
                }
                
                .pagination-btn:hover:not(:disabled) {
                    background-color: #f8f9fa;
                    border-color: #667eea;
                    color: #667eea;
                }
                
                .pagination-btn:disabled {
                    background-color: #f8f9fa;
                    color: #a0aec0;
                    cursor: not-allowed;
                }
                
                .page-info {
                    color: #4a5568;
                    font-size: 14px;
                }
            </style>
            
            <div class="container">
                <div class="title-container">
                    <h1 class="title">更新记录</h1>
                </div>
                <button id="addVersionBtn" style="display: none;">
                    <img src="assets/icons/png/plus.png" alt="添加">
                    提交更新
                </button>
                <div id="content">
                    <div class="loading">加载中...</div>
                </div>
            </div>
            
            <!-- 提交更新对话框 -->
            <div class="modal-overlay" id="versionModal">
                <div class="modal">
                    <div class="modal-header">
                        <h2 class="modal-title">提交更新记录</h2>
                        <button class="close-btn" id="closeModalBtn">&times;</button>
                    </div>
                    <form id="versionForm">
                        <div class="form-group">
                            <label for="verNum">版本号</label>
                            <input type="text" class="form-control" id="verNum" required>
                        </div>
                        <div class="form-group">
                            <label for="date">日期</label>
                            <input type="text" class="form-control" id="date" required>
                        </div>
                        <div class="form-group">
                            <label for="time">时间</label>
                            <input type="text" class="form-control" id="time" required>
                        </div>
                        <div class="form-group">
                            <label for="title">标题</label>
                            <input type="text" class="form-control" id="title" required>
                        </div>
                        <div class="form-group">
                            <label for="note">内容</label>
                            <textarea class="form-control" id="note" required></textarea>
                        </div>
                        <div class="modal-footer">
                            <button type="button" class="btn btn-secondary" id="cancelBtn">取消</button>
                            <button type="submit" class="btn btn-primary">提交</button>
                        </div>
                    </form>
                </div>
            </div>
        `;

        // 添加事件监听器
        this.addModalEventListeners();
    }

    // 添加模态框事件监听器
    addModalEventListeners() {
        const addButton = this.shadowRoot.getElementById('addVersionBtn');
        const closeButton = this.shadowRoot.getElementById('closeModalBtn');
        const cancelButton = this.shadowRoot.getElementById('cancelBtn');
        const modal = this.shadowRoot.getElementById('versionModal');
        const form = this.shadowRoot.getElementById('versionForm');

        // 点击添加按钮显示模态框
        if (addButton) {
            addButton.addEventListener('click', () => {
                this.prepareModalData();
                modal.classList.add('active');
            });
        }

        // 关闭模态框
        if (closeButton) {
            closeButton.addEventListener('click', () => {
                modal.classList.remove('active');
            });
        }

        // 取消按钮
        if (cancelButton) {
            cancelButton.addEventListener('click', () => {
                modal.classList.remove('active');
            });
        }

        // 表单提交
        if (form) {
            form.addEventListener('submit', (e) => {
                e.preventDefault();
                this.submitVersion();
            });
        }
    }

    // 准备模态框数据
    prepareModalData() {
        // 获取表单元素
        const verNumInput = this.shadowRoot.getElementById('verNum');
        const dateInput = this.shadowRoot.getElementById('date');
        const timeInput = this.shadowRoot.getElementById('time');
        
        // 设置当前日期和时间
        const now = new Date();
        const formattedDate = now.toLocaleDateString('zh-CN', {
            year: 'numeric',
            month: '2-digit',
            day: '2-digit'
        }).replace(/\//g, '-');
        
        const formattedTime = now.toLocaleTimeString('zh-CN', {
            hour: '2-digit',
            minute: '2-digit',
            second: '2-digit',
            hour12: false
        });
        
        dateInput.value = formattedDate;
        timeInput.value = formattedTime;
        
        // 计算新版本号
        if (this.versions && this.versions.length > 0) {
            const latestVersion = this.versions[0];
            const currentVersionParts = latestVersion.verNum.split('.');
            
            // 增加最后一位
            let newVersion;
            if (currentVersionParts.length >= 3) {
                currentVersionParts[2] = (parseInt(currentVersionParts[2]) + 1).toString();
                newVersion = currentVersionParts.join('.');
            } else {
                // 如果版本号格式不是 x.y.z，则简单地加0.0.1
                const versionNum = parseFloat(latestVersion.verNum);
                newVersion = (versionNum + 0.001).toFixed(3);
            }
            
            verNumInput.value = newVersion;
        } else {
            // 如果没有现有版本，使用默认的1.0.0
            verNumInput.value = '1.0.0';
        }
    }

    // 提交版本信息
    async submitVersion() {
        const modal = this.shadowRoot.getElementById('versionModal');
        const verNum = this.shadowRoot.getElementById('verNum').value;
        const date = this.shadowRoot.getElementById('date').value;
        const time = this.shadowRoot.getElementById('time').value;
        const title = this.shadowRoot.getElementById('title').value;
        const note = this.shadowRoot.getElementById('note').value;
        
        // 获取当前登录用户名
        let author = '未知用户';
        const userInfo = localStorage.getItem('userInfo');
        if (userInfo) {
            try {
                const user = JSON.parse(userInfo);
                author = user.username || '未知用户';
            } catch (parseError) {
                console.error('解析用户信息失败:', parseError);
            }
        }

        try {
            const response = await fetch('/api/versions', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    verNum,
                    date,
                    time,
                    title,
                    note,
                    author
                })
            });

            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }

            // 重新加载版本数据
            this.loadData();
            
            // 关闭模态框
            modal.classList.remove('active');
            
            // 清空表单
            this.shadowRoot.getElementById('title').value = '';
            this.shadowRoot.getElementById('note').value = '';
            
            // 显示成功消息
            alert('更新记录提交成功！');
            
        } catch (error) {
            console.error('提交更新记录失败:', error);
            alert('提交失败，请重试！');
        }
    }

    // 添加分页按钮事件监听
    addPaginationListeners() {
        const prevButton = this.shadowRoot.getElementById('prevPage');
        const nextButton = this.shadowRoot.getElementById('nextPage');

        if (prevButton) {
            prevButton.addEventListener('click', () => {
                if (this.currentPage > 1) {
                    this.currentPage--;
                    this.renderVersions();
                }
            });
        }

        if (nextButton) {
            nextButton.addEventListener('click', () => {
                if (this.currentPage < this.totalPages) {
                    this.currentPage++;
                    this.renderVersions();
                }
            });
        }
    }
}

customElements.define('update-history', UpdateHistory);