class TodoComponent extends HTMLElement {
    static {
        // 添加静态初始化标志
        this.isInitializing = false;
    }

    constructor() {
        super();
        this.attachShadow({ mode: 'open' });
        this.todos = [];
        this.selectedProject = null;
        this.selectedSubproject = null;
        this.expandedProjects = new Set();
        this.users = [];
        this.currentUser = null;
        this.editingTodo = null; // 当前正在编辑的待办事项
        this.isInitialized = false; // 添加初始化标志
    }

    // 初始化组件
    async initialize() {
        // 检查是否正在初始化
        if (TodoComponent.isInitializing) {
            return;
        }

        if (this.isInitialized) {
            return;
        }
        
        TodoComponent.isInitializing = true;
        
        try {
            await Promise.all([
                this.fetchTodos(),
                this.fetchUsers(),
                this.getCurrentUser()
            ]);
            this.isInitialized = true;
            this.render();
        } catch (error) {
            console.error('初始化组件时发生错误:', error);
            this.showError('初始化失败，请刷新页面重试');
        } finally {
            TodoComponent.isInitializing = false;
        }
    }

    async fetchTodos() {
        try {
            const response = await fetch('/api/todos');
            if (!response.ok) {
                throw new Error('获取待办事项失败');
            }
            this.todos = await response.json();
        } catch (error) {
            console.error('获取待办事项时发生错误:', error);
            this.showError('获取待办事项失败，请稍后重试');
        }
    }

    async fetchUsers() {
        try {
            const response = await fetch('/api/users');
            if (!response.ok) {
                throw new Error('获取用户数据失败');
            }
            const data = await response.json();
            this.users = data.users || [];
        } catch (error) {
            console.error('获取用户数据时发生错误:', error);
            this.showError('获取用户数据失败，请稍后重试');
        }
    }

    getCurrentUser() {
        try {
            const userStr = localStorage.getItem('userInfo');
            if (userStr) {
                this.currentUser = JSON.parse(userStr);
            } else {
                console.log('未找到登录用户信息');
            }
        } catch (error) {
            console.error('获取当前用户信息时发生错误:', error);
            this.showError('获取用户信息失败');
        }
    }

    showError(message) {
        const errorDiv = document.createElement('div');
        errorDiv.className = 'error-message';
        errorDiv.textContent = message;
        this.shadowRoot.appendChild(errorDiv);
    }

    // 构建项目树结构
    buildProjectTree() {
        const tree = {};
        this.todos.forEach(todo => {
            const project = todo.project || '其它';
            const subproject = todo.subproject || '其它';
            
            if (!tree[project]) {
                tree[project] = {
                    name: project,
                    subprojects: {}
                };
            }
            if (!tree[project].subprojects[subproject]) {
                tree[project].subprojects[subproject] = {
                    name: subproject,
                    todos: []
                };
            }
            tree[project].subprojects[subproject].todos.push(todo);
        });
        return tree;
    }

    // 渲染项目树
    renderProjectTree(tree) {
        const treeContainer = document.createElement('div');
        treeContainer.className = 'project-tree';

        Object.values(tree).forEach(project => {
            const projectNode = document.createElement('div');
            projectNode.className = 'project-node';
            
            const projectHeader = document.createElement('div');
            projectHeader.className = 'project-header';
            projectHeader.innerHTML = `
                <div class="project-header-content">
                    <span class="expand-icon ${this.expandedProjects.has(project.name) ? 'expanded' : ''}">▶</span>
                    <span class="project-name">${project.name}</span>
                    <span class="todo-count">(${Object.values(project.subprojects).reduce((sum, sub) => 
                        sum + sub.todos.length, 0)})</span>
                </div>
            `;
            
            projectHeader.addEventListener('click', () => {
                this.selectedProject = project.name;
                this.selectedSubproject = null;
                this.render();
            });

            const expandButton = projectHeader.querySelector('.expand-icon');
            expandButton.addEventListener('click', (e) => {
                e.stopPropagation();
                if (this.expandedProjects.has(project.name)) {
                    this.expandedProjects.delete(project.name);
                } else {
                    this.expandedProjects.add(project.name);
                }
                this.render();
            });

            const subprojectsContainer = document.createElement('div');
            subprojectsContainer.className = 'subprojects-container';
            subprojectsContainer.style.display = this.expandedProjects.has(project.name) ? 'block' : 'none';
            
            Object.values(project.subprojects).forEach(subproject => {
                const subprojectNode = document.createElement('div');
                subprojectNode.className = 'subproject-node';
                subprojectNode.innerHTML = `
                    <span class="subproject-name">${subproject.name}</span>
                    <span class="todo-count">(${subproject.todos.length})</span>
                `;
                
                subprojectNode.addEventListener('click', (e) => {
                    e.stopPropagation();
                    this.selectedProject = project.name;
                    this.selectedSubproject = subproject.name;
                    this.render();
                });

                subprojectsContainer.appendChild(subprojectNode);
            });

            projectNode.appendChild(projectHeader);
            projectNode.appendChild(subprojectsContainer);
            treeContainer.appendChild(projectNode);
        });

        // 添加显示全部按钮
        const showAllButton = document.createElement('button');
        showAllButton.className = 'show-all-button';
        showAllButton.textContent = '显示全部';
        showAllButton.addEventListener('click', () => {
            this.selectedProject = null;
            this.selectedSubproject = null;
            this.render();
        });
        treeContainer.appendChild(showAllButton);

        return treeContainer;
    }

    // 过滤待办事项
    filterTodos() {
        if (!this.currentUser) {
            console.log('未获取到当前用户信息，无法进行筛选');
            return [];
        }

        // 首先根据项目/子项目筛选
        let filteredTodos = this.todos;
        if (this.selectedProject) {
            filteredTodos = filteredTodos.filter(todo => {
                const matchesProject = todo.project === this.selectedProject;
                if (!this.selectedSubproject) {
                    return matchesProject;
                }
                return matchesProject && todo.subproject === this.selectedSubproject;
            });
        }

        // 根据用户等级进行筛选
        const userLevel = this.currentUser.level || 0;
        
        // 等级4可以看到所有待办事项
        if (userLevel === 4) {
            return filteredTodos;
        }

        // 等级3不能看到创建人和执行人都是等级4的待办事项
        if (userLevel === 3) {
            return filteredTodos.filter(todo => {
                const creator = this.users.find(u => u.username === todo.adduser);
                const executor = this.users.find(u => u.username === todo.exeuser);
                
                // 如果找不到用户信息，默认显示
                if (!creator || !executor) return true;
                
                // 只要创建人或执行人不是等级4，就显示
                return !(creator.level === 4 && executor.level === 4);
            });
        }

        // 等级2或更低只能看到创建人或执行人是自己的待办事项
        return filteredTodos.filter(todo => {
            return todo.adduser === this.currentUser.username || 
                   todo.exeuser === this.currentUser.username;
        });
    }

    // 创建模态对话框
    createModal() {
        // 创建样式
        const style = document.createElement('style');
        style.textContent = `
            .modal {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background-color: rgba(0, 0, 0, 0.5);
                display: flex;
                justify-content: center;
                align-items: center;
                z-index: 9999;
            }
            .modal-content {
                background-color: white;
                border-radius: 8px;
                width: 400px;
                max-width: 90%;
                box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
                position: relative;
                margin: auto;
            }
            .modal-header {
                padding: 15px;
                border-bottom: 1px solid #e9ecef;
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            .modal-header h3 {
                margin: 0;
                color: #212529;
            }
            .close-button {
                background: none;
                border: none;
                font-size: 1.5em;
                color: #6c757d;
                cursor: pointer;
                padding: 0;
                line-height: 1;
            }
            .modal-body {
                padding: 15px;
            }
            .modal-footer {
                padding: 15px;
                border-top: 1px solid #e9ecef;
                display: flex;
                justify-content: flex-end;
                gap: 10px;
            }
            .form-group {
                margin-bottom: 15px;
            }
            .form-group label {
                display: block;
                margin-bottom: 5px;
                color: #495057;
            }
            .form-control {
                width: 100%;
                padding: 8px;
                border: 1px solid #ced4da;
                border-radius: 4px;
                font-size: 14px;
            }
            .save-button, .cancel-button {
                padding: 8px 16px;
                border: none;
                border-radius: 4px;
                cursor: pointer;
                font-size: 14px;
            }
            .save-button {
                background-color: #007bff;
                color: white;
            }
            .save-button:hover {
                background-color: #0056b3;
            }
            .cancel-button {
                background-color: #6c757d;
                color: white;
            }
            .cancel-button:hover {
                background-color: #5a6268;
            }
        `;
        document.head.appendChild(style);

        const modal = document.createElement('div');
        modal.className = 'modal';
        modal.innerHTML = `
            <div class="modal-content">
                <div class="modal-header">
                    <h3>编辑执行人</h3>
                    <button class="close-button">&times;</button>
                </div>
                <div class="modal-body">
                    <div class="form-group">
                        <label for="executor">选择执行人：</label>
                        <select id="executor" class="form-control">
                            <option value="">请选择执行人</option>
                        </select>
                    </div>
                </div>
                <div class="modal-footer">
                    <button class="save-button">保存</button>
                    <button class="cancel-button">取消</button>
                </div>
            </div>
        `;

        // 添加关闭按钮事件
        const closeButton = modal.querySelector('.close-button');
        closeButton.addEventListener('click', () => {
            modal.remove();
            style.remove(); // 移除样式
        });

        // 添加取消按钮事件
        const cancelButton = modal.querySelector('.cancel-button');
        cancelButton.addEventListener('click', () => {
            modal.remove();
            style.remove(); // 移除样式
        });

        // 添加保存按钮事件
        const saveButton = modal.querySelector('.save-button');
        saveButton.addEventListener('click', async () => {
            const executor = modal.querySelector('#executor').value;
            if (executor && this.editingTodo) {
                try {
                    const response = await fetch(`/api/todos/${this.editingTodo.id}`, {
                        method: 'PUT',
                        headers: {
                            'Content-Type': 'application/json'
                        },
                        body: JSON.stringify({
                            ...this.editingTodo,
                            exeuser: executor
                        })
                    });

                    if (!response.ok) {
                        throw new Error('更新执行人失败');
                    }

                    // 更新本地数据
                    this.editingTodo.exeuser = executor;
                    this.render();
                    modal.remove();
                    style.remove(); // 移除样式
                } catch (error) {
                    console.error('更新执行人时发生错误:', error);
                    this.showError('更新执行人失败，请稍后重试');
                }
            }
        });

        return modal;
    }

    // 显示编辑执行人对话框
    showEditExecutorModal(todo) {
        this.editingTodo = todo;
        const modal = this.createModal();
        
        // 获取当前用户等级
        const currentUserLevel = this.currentUser.access_level || 0;
        
        // 填充用户下拉列表
        const executorSelect = modal.querySelector('#executor');
        
        // 筛选符合条件的用户
        const availableUsers = this.users.filter(user => 
            user && 
            user.access_level > 0 && 
            user.access_level <= currentUserLevel
        );

        // 添加用户选项
        availableUsers.forEach(user => {
            const option = document.createElement('option');
            option.value = user.username;
            option.textContent = `${user.username} (${user.full_name})`;
            if (user.username === todo.exeuser) {
                option.selected = true;
            }
            executorSelect.appendChild(option);
        });

        document.body.appendChild(modal);
    }

    render() {
        if (!this.isInitialized) {
            return;
        }

        // 清空现有内容
        this.shadowRoot.innerHTML = '';
        
        // 添加样式
        const style = document.createElement('style');
        style.textContent = `
            .container {
                display: flex;
                height: 100%;
                font-family: Arial, sans-serif;
            }
            .project-tree {
                width: 250px;
                background: #f8f9fa;
                border-right: 1px solid #e9ecef;
                padding: 15px;
                overflow-y: auto;
                display: flex;
                flex-direction: column;
            }
            .show-all-button {
                margin-top: 15px;
                padding: 8px 16px;
                background-color: #007bff;
                color: white;
                border: none;
                border-radius: 4px;
                cursor: pointer;
                font-size: 14px;
                transition: background-color 0.2s;
            }
            .show-all-button:hover {
                background-color: #0056b3;
            }
            .show-all-button:active {
                background-color: #004085;
            }
            .todo-container {
                flex: 1;
                padding: 20px;
                overflow-y: auto;
            }
            .project-node {
                margin-bottom: 10px;
            }
            .project-header {
                padding: 8px;
                background: #e9ecef;
                border-radius: 4px;
                cursor: pointer;
            }
            .project-header-content {
                display: flex;
                align-items: center;
                gap: 8px;
            }
            .project-header:hover {
                background: #dee2e6;
            }
            .expand-icon {
                font-size: 12px;
                transition: transform 0.2s;
                color: #495057;
            }
            .expand-icon.expanded {
                transform: rotate(90deg);
            }
            .subprojects-container {
                margin-left: 20px;
                margin-top: 5px;
            }
            .subproject-node {
                padding: 6px 8px;
                cursor: pointer;
                border-radius: 4px;
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            .subproject-node:hover {
                background: #e9ecef;
            }
            .todo-count {
                font-size: 0.9em;
                color: #6c757d;
            }
            .todo-item {
                background: #fff;
                border: 1px solid #e9ecef;
                border-radius: 8px;
                padding: 15px;
                margin-bottom: 15px;
                box-shadow: 0 2px 4px rgba(0,0,0,0.05);
            }
            .todo-header {
                display: flex;
                justify-content: space-between;
                align-items: center;
                margin-bottom: 12px;
                padding-bottom: 8px;
                border-bottom: 1px solid #e9ecef;
            }
            .todo-header h3 {
                margin: 0;
                color: #212529;
                font-size: 1.1em;
            }
            .todo-content {
                color: #495057;
            }
            .todo-info {
                margin-bottom: 8px;
                font-size: 0.9em;
                display: flex;
                align-items: center;
                flex-wrap: wrap;
                gap: 8px;
            }
            .todo-info .label {
                color: #6c757d;
            }
            .todo-info .value {
                color: #212529;
            }
            .todo-description {
                margin-top: 12px;
                padding-top: 12px;
                border-top: 1px solid #e9ecef;
                color: #495057;
                font-size: 0.95em;
            }
            .status {
                display: inline-block;
                padding: 4px 8px;
                border-radius: 4px;
                font-size: 0.9em;
            }
            .status.completed {
                background: #d4edda;
                color: #155724;
            }
            .status.pending {
                background: #fff3cd;
                color: #856404;
            }
            .error-message {
                color: #721c24;
                padding: 10px;
                background: #f8d7da;
                border-radius: 4px;
                margin: 10px;
            }
            .selected {
                background: #cfe2ff !important;
            }
            .executor-link {
                color: #007bff;
                text-decoration: none;
                cursor: pointer;
            }
            .executor-link:hover {
                text-decoration: underline;
            }
        `;
        this.shadowRoot.appendChild(style);

        // 创建主容器
        const container = document.createElement('div');
        container.className = 'container';

        // 构建并渲染项目树
        const tree = this.buildProjectTree();
        const treeContainer = this.renderProjectTree(tree);
        container.appendChild(treeContainer);

        // 创建待办事项列表容器
        const todosContainer = document.createElement('div');
        todosContainer.className = 'todo-container';
        
        // 渲染过滤后的待办事项
        const filteredTodos = this.filterTodos();
        filteredTodos.forEach(todo => {
            const todoElement = document.createElement('div');
            todoElement.className = 'todo-item';
            
            // 格式化日期
            const createdDate = new Date(todo.created_at).toLocaleString('zh-CN');
            const scheDate = new Date(todo.sche_time).toLocaleString('zh-CN');
            const completeDate = todo.complete_time ? 
                new Date(todo.complete_time).toLocaleString('zh-CN') : '';

            todoElement.innerHTML = `
                <div class="todo-header">
                    <h3>${todo.project}-${todo.subproject}</h3>
                    <span class="status ${todo.completed ? 'completed' : 'pending'}">
                        ${todo.completed ? '已完成' : '进行中'}
                    </span>
                </div>
                <div class="todo-content">
                    <div class="todo-info">
                        <span class="label">执行人：</span>
                        <a href="#" class="executor-link">${todo.exeuser || '未分配'}</a>
                        <span class="spacer"></span>
                        <span class="label">创建人：</span>
                        <span class="value">${todo.adduser}</span>
                    </div>
                    <div class="todo-info">
                        <span class="label">计划时间：</span>
                        <span class="value">${scheDate}</span>
                        <span class="label">创建时间：</span>
                        <span class="value">${createdDate}</span>
                    </div>
                    ${todo.completed ? `
                        <div class="todo-info">
                            <span class="label">完成时间：</span>
                            <span class="value">${completeDate}</span>
                        </div>
                    ` : ''}
                    <div class="todo-description">
                        ${todo.text || '无详细描述'}
                    </div>
                </div>
            `;

            // 添加执行人链接点击事件
            const executorLink = todoElement.querySelector('.executor-link');
            executorLink.addEventListener('click', (e) => {
                e.preventDefault();
                this.showEditExecutorModal(todo);
            });

            todosContainer.appendChild(todoElement);
        });

        container.appendChild(todosContainer);
        this.shadowRoot.appendChild(container);
    }

    connectedCallback() {
        this.initialize();
    }
}

customElements.define('todo-component', TodoComponent);