// 主应用类
class WorkListApp {
    constructor() {
        this.tasks = [];
        this.currentEditingTask = null;
        this.currentFilter = 'all';
        this.excludedStatuses = new Set();
        this.currentUser = null;
        this.init();
    }

    // 初始化应用
    async init() {
        // 先检查登录状态
        await this.checkAuthStatus();

        // 如果已登录,绑定事件并加载任务
        if (this.currentUser) {
            this.bindEvents();
            this.loadTasks();
            this.setupDatePicker();
        }
    }

    // 检查认证状态
    async checkAuthStatus() {
        try {
            const response = await api.checkAuth();
            if (response.authenticated) {
                this.currentUser = response.user;
                this.showMainApp();
            } else {
                this.showLoginPage();
            }
        } catch (error) {
            console.log('未登录:', error);
            this.showLoginPage();
        }
    }

    // 显示登录页面
    showLoginPage() {
        document.getElementById('loginPage').style.display = 'flex';
        document.getElementById('mainApp').style.display = 'none';

        // 绑定登录表单事件
        const loginForm = document.getElementById('loginForm');
        loginForm.addEventListener('submit', async (e) => {
            e.preventDefault();
            await this.handleLogin();
        });
    }

    // 显示主应用页面
    showMainApp() {
        document.getElementById('loginPage').style.display = 'none';
        document.getElementById('mainApp').style.display = 'block';

        // 显示用户名
        if (this.currentUser) {
            document.getElementById('currentUsername').textContent = this.currentUser.username;
        }
    }

    // 处理登录
    async handleLogin() {
        const username = document.getElementById('loginUsername').value;
        const password = document.getElementById('loginPassword').value;
        const errorDiv = document.getElementById('loginError');

        try {
            errorDiv.style.display = 'none';
            const response = await api.login(username, password);

            if (response.user) {
                this.currentUser = response.user;
                this.showMainApp();

                // 绑定事件并加载任务
                this.bindEvents();
                this.loadTasks();
                this.setupDatePicker();
            }
        } catch (error) {
            errorDiv.textContent = error.message || '登录失败,请检查用户名和密码';
            errorDiv.style.display = 'block';
        }
    }

    // 处理登出
    async handleLogout() {
        try {
            await api.logout();
            this.currentUser = null;
            this.tasks = [];
            this.showLoginPage();
        } catch (error) {
            console.error('登出失败:', error);
            alert('登出失败: ' + error.message);
        }
    }

    // 绑定事件
    bindEvents() {
        // 登出按钮
        const logoutBtn = document.getElementById('logoutBtn');
        if (logoutBtn && !logoutBtn.hasAttribute('data-bound')) {
            logoutBtn.addEventListener('click', () => {
                this.handleLogout();
            });
            logoutBtn.setAttribute('data-bound', 'true');
        }
        // 添加任务按钮
        document.getElementById('addTaskBtn').addEventListener('click', () => {
            this.showTaskModal();
        });

        // 报表按钮
        document.getElementById('reportBtn').addEventListener('click', () => {
            this.showReportModal();
        });

        // 时间历史按钮
        document.getElementById('timeHistoryBtn').addEventListener('click', () => {
            this.showTimeHistoryModal();
        });

        // 模态框关闭
        document.querySelectorAll('.close').forEach(closeBtn => {
            closeBtn.addEventListener('click', (e) => {
                const modal = e.target.closest('.modal');
                this.hideModal(modal);
            });
        });

        // 点击模态框外部关闭
        document.querySelectorAll('.modal').forEach(modal => {
            modal.addEventListener('click', (e) => {
                if (e.target === modal) {
                    this.hideModal(modal);
                }
            });
        });

        // 任务表单
        document.getElementById('saveBtn').addEventListener('click', () => {
            this.saveTask();
        });

        document.getElementById('cancelBtn').addEventListener('click', () => {
            this.hideModal(document.getElementById('taskModal'));
        });

        // AI润色按钮
        document.getElementById('polishBtn').addEventListener('click', () => {
            this.polishDescription();
        });

        // 润色相关按钮
        document.getElementById('usePolishedBtn').addEventListener('click', () => {
            this.usePolishedDescription();
        });

        document.getElementById('discardPolishedBtn').addEventListener('click', () => {
            this.discardPolishedDescription();
        });

        // 报表加载按钮
        document.getElementById('loadReportBtn').addEventListener('click', () => {
            this.loadReport();
        });

        // 历史记录加载按钮
        document.getElementById('loadHistoryBtn').addEventListener('click', () => {
            this.loadTimeHistory();
        });

        // 任务历史加载按钮
        document.getElementById('loadTaskHistoryBtn').addEventListener('click', () => {
            this.loadTaskTimeHistory();
        });

        // 任务筛选按钮
        document.querySelectorAll('.filter-btn').forEach(btn => {
            btn.addEventListener('click', (event) => {
                const filter = event.currentTarget.dataset.filter;
                this.setTaskFilter(filter);
            });
        });

        // 排除状态按钮
        document.querySelectorAll('.exclusion-btn').forEach(btn => {
            btn.addEventListener('click', (event) => {
                const status = event.currentTarget.dataset.status;
                this.toggleExcludeStatus(status);
            });
        });
    }

    // 设置日期选择器
    setupDatePicker() {
        const dateInput = document.getElementById('reportDate');
        const today = new Date().toISOString().split('T')[0];
        dateInput.value = today;
    }

    // 显示加载提示
    showLoading() {
        document.getElementById('loadingOverlay').style.display = 'flex';
    }

    // 隐藏加载提示
    hideLoading() {
        document.getElementById('loadingOverlay').style.display = 'none';
    }

    // 显示模态框
    showModal(modalId) {
        const modal = document.getElementById(modalId);
        modal.style.display = 'block';
        document.body.style.overflow = 'hidden';
    }

    // 隐藏模态框
    hideModal(modal) {
        modal.style.display = 'none';
        document.body.style.overflow = 'auto';
    }

    // 显示任务模态框
    showTaskModal(task = null) {
        this.currentEditingTask = task;
        const modal = document.getElementById('taskModal');
        const form = document.getElementById('taskForm');
        const polishedDiv = document.getElementById('polishedDescription');

        if (task) {
            // 编辑模式
            document.getElementById('modalTitle').textContent = '编辑任务';
            document.getElementById('taskTitle').value = task.title;
            document.getElementById('taskDescription').value = task.description || '';
            document.getElementById('taskStatus').value = task.status;

            // 如果有润色后的描述，显示它
            if (task.polished_description) {
                const polishedText = polishedDiv.querySelector('.polished-text');
                polishedText.textContent = task.polished_description;
                polishedDiv.style.display = 'block';
            } else {
                polishedDiv.style.display = 'none';
            }
        } else {
            // 新建模式
            document.getElementById('modalTitle').textContent = '添加任务';
            form.reset();
            polishedDiv.style.display = 'none';
        }

        this.showModal('taskModal');
    }

    // 保存任务
    async saveTask() {
        try {
            this.showLoading();

            const formData = {
                title: document.getElementById('taskTitle').value.trim(),
                description: document.getElementById('taskDescription').value.trim(),
                status: document.getElementById('taskStatus').value
            };

            if (!formData.title) {
                throw new Error('任务标题不能为空');
            }

            let savedTask;
            if (this.currentEditingTask) {
                // 更新任务
                savedTask = await api.updateTask(this.currentEditingTask.id, formData);
            } else {
                // 创建任务
                savedTask = await api.createTask(formData);
            }

            this.hideModal(document.getElementById('taskModal'));
            await this.loadTasks();
            this.showNotification('任务保存成功', 'success');

        } catch (error) {
            console.error('保存任务失败:', error);
            this.showNotification(error.message || '保存任务失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // 删除任务
    async deleteTask(taskId) {
        if (!confirm('确定要删除这个任务吗？')) {
            return;
        }

        try {
            this.showLoading();
            await api.deleteTask(taskId);
            await this.loadTasks();
            this.showNotification('任务删除成功', 'success');
        } catch (error) {
            console.error('删除任务失败:', error);
            this.showNotification(error.message || '删除任务失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // 开始计时
    async startTimer(taskId) {
        try {
            this.showLoading();
            await taskTimer.startTimer(taskId);
            this.updateTaskStatusLocal(taskId, 'in_progress');
            this.renderTasks();
            this.updateStats();
            this.showNotification('计时开始', 'success');
        } catch (error) {
            console.error('开始计时失败:', error);
            this.showNotification(error.message || '开始计时失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // 停止计时
    async stopTimer(taskId) {
        try {
            this.showLoading();
            await taskTimer.stopTimer(taskId);
            this.updateTaskStatusLocal(taskId, 'pending');
            this.renderTasks();
            this.updateStats();
            this.showNotification('计时结束', 'success');
        } catch (error) {
            console.error('停止计时失败:', error);
            this.showNotification(error.message || '停止计时失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // AI润色描述
    async polishDescription() {
        const description = document.getElementById('taskDescription').value.trim();
        if (!description) {
            this.showNotification('请先输入任务描述', 'warning');
            return;
        }

        try {
            this.showLoading();
            
            // 如果有正在编辑的任务，使用其ID；否则提示用户先保存任务
            if (!this.currentEditingTask) {
                this.showNotification('请先保存任务，然后再进行润色', 'warning');
                return;
            }

            const result = await api.polishTaskDescription(this.currentEditingTask.id);
            
            // 显示润色结果
            const polishedDiv = document.getElementById('polishedDescription');
            const polishedText = polishedDiv.querySelector('.polished-text');
            polishedText.textContent = result.polished;
            polishedDiv.style.display = 'block';
            
            this.showNotification('AI润色完成', 'success');

        } catch (error) {
            console.error('AI润色失败:', error);
            this.showNotification(error.message || 'AI润色失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // 使用润色版本
    async usePolishedDescription() {
        const polishedText = document.querySelector('.polished-text').textContent;
        document.getElementById('taskDescription').value = polishedText;
        document.getElementById('polishedDescription').style.display = 'none';

        // 如果是编辑模式，立即保存更新，将润色版本替换原始描述
        if (this.currentEditingTask) {
            try {
                this.showLoading();

                // 更新任务：description = 润色版本, polished_description = null
                await api.updateTask(this.currentEditingTask.id, {
                    description: polishedText,
                    polished_description: null  // 清空润色字段
                });

                // 关闭模态框
                this.hideModal(document.getElementById('taskModal'));

                // 刷新任务列表
                await this.loadTasks();

                this.showNotification('已应用润色版本', 'success');
            } catch (error) {
                console.error('应用润色版本失败:', error);
                this.showNotification(error.message || '应用润色版本失败', 'error');
            } finally {
                this.hideLoading();
            }
        } else {
            this.showNotification('已使用润色版本', 'success');
        }
    }

    // 丢弃润色版本
    discardPolishedDescription() {
        document.getElementById('polishedDescription').style.display = 'none';
    }

    // 加载任务列表
    async loadTasks() {
        try {
            this.tasks = await api.getTasks();
            // 恢复未结束的计时器（需要在渲染之前）
            await taskTimer.restoreTimers(this.tasks);
            this.renderTasks();
            this.updateStats();
        } catch (error) {
            console.error('加载任务失败:', error);
            this.showNotification('加载任务失败', 'error');
        }
    }

    // 设置任务状态筛选
    setTaskFilter(filter = 'all') {
        const normalized = filter || 'all';
        if (this.currentFilter !== normalized) {
            this.currentFilter = normalized;
        }
        this.renderTasks();
    }

    // 更新筛选按钮状态
    updateFilterButtons() {
        document.querySelectorAll('.filter-btn').forEach(btn => {
            const isActive = btn.dataset.filter === this.currentFilter;
            btn.classList.toggle('active', isActive);
        });
    }

    // 切换排除状态
    toggleExcludeStatus(status) {
        if (this.excludedStatuses.has(status)) {
            this.excludedStatuses.delete(status);
        } else {
            this.excludedStatuses.add(status);
        }
        this.renderTasks();
    }

    // 更新排除按钮状态
    updateExclusionButtons() {
        document.querySelectorAll('.exclusion-btn').forEach(btn => {
            const status = btn.dataset.status;
            btn.classList.toggle('active', this.excludedStatuses.has(status));
        });
    }

    // 获取筛选后的任务列表
    getFilteredTasks() {
        if (this.currentFilter === 'all') {
            return this.tasks.filter(task => !this.excludedStatuses.has(task.status));
        }
        return this.tasks
            .filter(task => task.status === this.currentFilter)
            .filter(task => !this.excludedStatuses.has(task.status));
    }

    // 获取筛选名称
    getFilterDisplayName(filter) {
        const map = {
            'all': '全部任务',
            'pending': '未开始任务',
            'in_progress': '进行中任务',
            'completed': '已完成任务'
        };
        return map[filter] || '任务';
    }

    // 渲染任务列表
    renderTasks() {
        const taskList = document.getElementById('taskList');
        this.updateFilterButtons();
        this.updateExclusionButtons();
        const filteredTasks = this.getFilteredTasks();
        
        if (this.tasks.length === 0) {
            taskList.innerHTML = `
                <div class="empty-state">
                    <i class="fas fa-tasks"></i>
                    <h3>暂无任务</h3>
                    <p>点击"添加任务"开始记录你的工作</p>
                </div>
            `;
            return;
        }

        if (filteredTasks.length === 0) {
            const filterLabel = this.getFilterDisplayName(this.currentFilter);
            taskList.innerHTML = `
                <div class="empty-state">
                    <i class="fas fa-filter"></i>
                    <h3>暂无${filterLabel}</h3>
                    <p>试试切换其他状态，或者新建一条任务</p>
                </div>
            `;
            return;
        }

        taskList.innerHTML = filteredTasks.map(task => this.renderTaskItem(task)).join('');
    }

    // 渲染单个任务项
    renderTaskItem(task) {
        const statusClass = task.status;
        const statusText = this.getStatusText(task.status);
        const isRunning = taskTimer.hasActiveTimer(task.id);
        
        // 如果正在计时，显示当前会话时长；否则显示总时长
        let displayTime;
        if (isRunning) {
            const timer = taskTimer.activeTimers.get(task.id);
            const currentDuration = timer ? timer.currentSessionDuration || 0 : 0;
            displayTime = this.formatTime(currentDuration);
        } else {
            displayTime = this.formatTime(task.total_time || 0);
        }

        return `
            <div class="task-item ${statusClass} fade-in" data-task-id="${task.id}">
                <div class="task-header">
                    <div>
                        <div class="task-title">${this.escapeHtml(task.title)}</div>
                        <div class="task-status ${statusClass}">${statusText}</div>
                    </div>
                    <div class="task-actions">
                        <button class="btn btn-outline btn-sm" onclick="app.showTaskModal(${JSON.stringify(task).replace(/"/g, '&quot;')})">
                            <i class="fas fa-edit"></i> 编辑
                        </button>
                        <button class="btn btn-outline btn-sm" onclick="app.showTaskTimeHistory(${task.id})">
                            <i class="fas fa-clock"></i> 时间历史
                        </button>
                        <button class="btn btn-danger btn-sm" onclick="app.deleteTask(${task.id})">
                            <i class="fas fa-trash"></i> 删除
                        </button>
                    </div>
                </div>
                
                ${task.description ? `
                    <div class="task-description ${task.polished_description ? 'polished' : ''}">${this.escapeHtml(task.description)}${task.polished_description ? `
                            <div class="polished-version">
                                <strong>润色版本：</strong>
                                ${this.escapeHtml(task.polished_description)}
                            </div>
                        ` : ''}</div>
                ` : ''}
                
                <div class="task-timer">
                    <div class="timer-display">${displayTime}</div>
                    <div class="timer-controls">
                        <button class="btn btn-success btn-sm start-timer-btn" 
                                onclick="app.startTimer(${task.id})" 
                                style="display: ${isRunning ? 'none' : 'inline-flex'}">
                            <i class="fas fa-play"></i> 开始
                        </button>
                        <button class="btn btn-danger btn-sm stop-timer-btn" 
                                onclick="app.stopTimer(${task.id})" 
                                style="display: ${isRunning ? 'inline-flex' : 'none'}">
                            <i class="fas fa-stop"></i> 停止
                        </button>
                    </div>
                </div>
                
                <div class="task-stats">
                    <div class="stat-item">
                        <i class="fas fa-clock"></i>
                        <span>总时长: ${this.formatTime(task.total_time || 0)}</span>
                    </div>
                    <div class="stat-item">
                        <i class="fas fa-calendar"></i>
                        <span>创建: ${this.formatDate(task.created_at)}</span>
                    </div>
                </div>
            </div>
        `;
    }

    // 更新本地任务状态
    updateTaskStatusLocal(taskId, status) {
        const task = this.tasks.find(item => item.id === taskId);
        if (task) {
            task.status = status;
        }
    }

    // 更新统计信息
    updateStats() {
        const totalTime = this.tasks.reduce((sum, task) => sum + (task.total_time || 0), 0);
        const completedTasks = this.tasks.filter(task => task.status === 'completed').length;
        const activeTasks = this.tasks.filter(task => task.status === 'in_progress').length;

        document.getElementById('totalTime').textContent = this.formatTime(totalTime);
        document.getElementById('completedTasks').textContent = completedTasks;
        document.getElementById('activeTasks').textContent = activeTasks;
    }

    // 显示报表模态框
    showReportModal() {
        this.showModal('reportModal');
        this.loadReport();
    }

    // 显示时间历史模态框
    showTimeHistoryModal() {
        this.showModal('timeHistoryModal');
        this.loadTaskFilter();
        this.loadTimeHistory();
    }

    // 显示任务时间历史模态框
    showTaskTimeHistory(taskId) {
        this.currentViewingTaskId = taskId;
        const task = this.tasks.find(t => t.id === taskId);
        if (task) {
            document.getElementById('taskHistoryTitle').textContent = `"${task.title}" 的时间历史`;
        }
        this.showModal('taskTimeHistoryModal');
        this.loadTaskTimeHistory();
    }

    // 加载报表
    async loadReport() {
        try {
            this.showLoading();
            const date = document.getElementById('reportDate').value;
            const report = await api.getDailyReport(date);
            this.renderReport(report);
        } catch (error) {
            console.error('加载报表失败:', error);
            this.showNotification('加载报表失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // 渲染报表
    renderReport(report) {
        const reportContent = document.getElementById('reportContent');
        
        if (report.task_stats.length === 0) {
            reportContent.innerHTML = `
                <div class="empty-state">
                    <i class="fas fa-chart-bar"></i>
                    <h3>暂无数据</h3>
                    <p>${report.date} 没有记录任何工作时间</p>
                </div>
            `;
            return;
        }

        const totalTime = this.formatTime(report.total_time);
        
        reportContent.innerHTML = `
            <div class="report-day">
                <h4>${report.date} - 总工作时长: ${totalTime}</h4>
                ${report.task_stats.map(taskStat => `
                    <div class="report-task">
                        <div class="report-task-title">${this.escapeHtml(taskStat.task.title)}</div>
                        <div class="report-task-time">${this.formatTime(taskStat.total_duration)}</div>
                    </div>
                `).join('')}
            </div>
        `;
    }

    // 加载任务筛选器
    loadTaskFilter() {
        const taskFilter = document.getElementById('historyTaskFilter');
        taskFilter.innerHTML = '<option value="">所有任务</option>';
        
        this.tasks.forEach(task => {
            const option = document.createElement('option');
            option.value = task.id;
            option.textContent = task.title;
            taskFilter.appendChild(option);
        });
    }

    // 加载时间历史
    async loadTimeHistory() {
        try {
            this.showLoading();
            const days = parseInt(document.getElementById('historyDays').value);
            const taskId = document.getElementById('historyTaskFilter').value || null;
            
            const history = await api.getAllTimeHistory(days, taskId);
            this.renderTimeHistory(history);
        } catch (error) {
            console.error('加载时间历史失败:', error);
            this.showNotification('加载时间历史失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // 加载任务时间历史
    async loadTaskTimeHistory() {
        if (!this.currentViewingTaskId) return;
        
        try {
            this.showLoading();
            const days = parseInt(document.getElementById('taskHistoryDays').value);
            
            const history = await api.getTaskTimeHistory(this.currentViewingTaskId, days);
            this.renderTaskTimeHistory(history);
        } catch (error) {
            console.error('加载任务时间历史失败:', error);
            this.showNotification('加载任务时间历史失败', 'error');
        } finally {
            this.hideLoading();
        }
    }

    // 渲染时间历史
    renderTimeHistory(history) {
        const content = document.getElementById('timeHistoryContent');
        
        if (history.daily_tasks.length === 0) {
            content.innerHTML = `
                <div class="history-empty">
                    <i class="fas fa-history"></i>
                    <h3>暂无时间记录</h3>
                    <p>在指定时间段内没有找到任何工作时间记录</p>
                </div>
            `;
            return;
        }

        content.innerHTML = history.daily_tasks.map(day => `
            <div class="history-day">
                <h4>
                    ${this.formatDate(day.date)}
                    <span class="day-total-time">${this.formatTime(day.total_time)}</span>
                </h4>
                ${day.tasks.map(task => `
                    <div class="history-task">
                        <div class="history-task-header">
                            <div class="history-task-title">${this.escapeHtml(task.task.title)}</div>
                            <div class="history-task-total">${this.formatTime(task.total_duration)}</div>
                        </div>
                        <div class="time-segments">
                            ${task.segments.map(segment => `
                                <div class="time-segment">
                                    <div class="segment-timespan">
                                        ${this.formatDateTime(segment.start_time)} - ${this.formatDateTime(segment.end_time)}
                                    </div>
                                    <div class="segment-time">
                                        <div class="segment-duration">${this.formatTime(segment.duration)}</div>
                                        <div class="segment-period">${this.formatTimePeriod(segment.start_time, segment.end_time)}</div>
                                    </div>
                                </div>
                            `).join('')}
                        </div>
                    </div>
                `).join('')}
            </div>
        `).join('');
    }

    // 渲染任务时间历史
    renderTaskTimeHistory(history) {
        const content = document.getElementById('taskTimeHistoryContent');
        
        if (history.daily_segments.length === 0) {
            content.innerHTML = `
                <div class="history-empty">
                    <i class="fas fa-clock"></i>
                    <h3>暂无时间记录</h3>
                    <p>该任务在指定时间段内没有工作时间记录</p>
                </div>
            `;
            return;
        }

        content.innerHTML = history.daily_segments.map(day => `
            <div class="history-day">
                <h4>
                    ${this.formatDate(day.date)}
                    <span class="day-total-time">${this.formatTime(day.total_duration)}</span>
                </h4>
                <div class="time-segments">
                    ${day.segments.map(segment => `
                        <div class="time-segment">
                            <div class="segment-timespan">
                                ${this.formatDateTime(segment.start_time)} - ${this.formatDateTime(segment.end_time)}
                            </div>
                            <div class="segment-time">
                                <div class="segment-duration">${this.formatTime(segment.duration)}</div>
                                <div class="segment-period">${this.formatTimePeriod(segment.start_time, segment.end_time)}</div>
                            </div>
                        </div>
                    `).join('')}
                </div>
            </div>
        `).join('');
    }

    // 工具方法
    getStatusText(status) {
        const statusMap = {
            'pending': '待开始',
            'in_progress': '进行中',
            'completed': '已完成'
        };
        return statusMap[status] || status;
    }

    formatTime(seconds) {
        const hours = Math.floor(seconds / 3600);
        const minutes = Math.floor((seconds % 3600) / 60);
        const secs = seconds % 60;
        return `${hours.toString().padStart(2, '0')}:${minutes.toString().padStart(2, '0')}:${secs.toString().padStart(2, '0')}`;
    }

    // 后端时间为UTC（无Z），需要按UTC解析并按上海时区显示
    parseUtcISO(dateTimeString) {
        if (!dateTimeString) return null;
        // 如果字符串不包含时区信息，则按UTC处理（补上Z）
        const hasTimezone = /[zZ]|[\+\-]\d{2}:?\d{2}$/.test(dateTimeString);
        const normalized = hasTimezone ? dateTimeString : `${dateTimeString}Z`;
        return new Date(normalized);
    }

    formatDate(dateString) {
        const date = this.parseUtcISO(dateString);
        if (!date) return '';
        return date.toLocaleDateString('zh-CN', { timeZone: 'Asia/Shanghai' });
    }

    formatDateTime(dateTimeString) {
        const date = this.parseUtcISO(dateTimeString);
        if (!date) return '';
        return date.toLocaleString('zh-CN', {
            month: '2-digit',
            day: '2-digit',
            hour: '2-digit',
            minute: '2-digit',
            second: '2-digit',
            timeZone: 'Asia/Shanghai'
        });
    }

    formatTimePeriod(startTime, endTime) {
        const start = this.parseUtcISO(startTime);
        const end = this.parseUtcISO(endTime);
        const duration = Math.floor((end - start) / 1000);
        
        if (duration < 60) {
            return `${duration}秒`;
        } else if (duration < 3600) {
            const minutes = Math.floor(duration / 60);
            const seconds = duration % 60;
            return `${minutes}分${seconds}秒`;
        } else {
            const hours = Math.floor(duration / 3600);
            const minutes = Math.floor((duration % 3600) / 60);
            return `${hours}小时${minutes}分钟`;
        }
    }

    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }

    showNotification(message, type = 'info') {
        // 简单的通知实现
        const notification = document.createElement('div');
        notification.className = `notification notification-${type}`;
        notification.textContent = message;
        notification.style.cssText = `
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 15px 20px;
            border-radius: 8px;
            color: white;
            font-weight: 600;
            z-index: 3000;
            animation: slideIn 0.3s ease;
            max-width: 300px;
        `;

        // 根据类型设置背景色
        const colors = {
            'success': '#48bb78',
            'error': '#f56565',
            'warning': '#ed8936',
            'info': '#4299e1'
        };
        notification.style.backgroundColor = colors[type] || colors.info;

        document.body.appendChild(notification);

        // 3秒后自动移除
        setTimeout(() => {
            notification.remove();
        }, 3000);
    }
}

// 页面加载完成后初始化应用
document.addEventListener('DOMContentLoaded', () => {
    window.app = new WorkListApp();
});