class TodoTree {
    static buildProjectTree(todos) {
        const tree = {};
        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;
    }

    static renderProjectTree(tree, {
        expandedProjects,
        selectedProject,
        selectedSubproject,
        showCompleted,
        onProjectSelect,
        onSubprojectSelect,
        onExpandToggle,
        onShowCompletedChange,
        onShowAll,
        onAddTodo
    }) {
        const treeContainer = document.createElement('div');
        treeContainer.className = 'project-tree';

        // 创建树内容容器
        const treeContent = document.createElement('div');
        treeContent.className = 'tree-content';

        // 添加新增待办按钮
        const addTodoButton = document.createElement('button');
        addTodoButton.className = 'add-todo-button';
        addTodoButton.textContent = '新增待办';
        addTodoButton.addEventListener('click', onAddTodo);
        treeContent.appendChild(addTodoButton);

        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 ${expandedProjects.has(project.name) ? 'expanded' : ''}">▶</span>
                    <span class="project-name">${project.name}</span>
                    <span class="todo-count">(${Object.values(project.subprojects).reduce((sum, sub) => 
                        sum + sub.todos.length, 0)})</span>
                </div>
            `;
            
            projectHeader.addEventListener('click', () => {
                onProjectSelect(project.name);
            });

            const expandButton = projectHeader.querySelector('.expand-icon');
            expandButton.addEventListener('click', (e) => {
                e.stopPropagation();
                onExpandToggle(project.name);
            });

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

                subprojectsContainer.appendChild(subprojectNode);
            });

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

        // 创建底部控制区域
        const bottomControls = document.createElement('div');
        bottomControls.className = 'bottom-controls';

        // 添加显示已完成复选框
        const showCompletedContainer = document.createElement('div');
        showCompletedContainer.className = 'show-completed-container';
        showCompletedContainer.innerHTML = `
            <input type="checkbox" id="show-completed" ${showCompleted ? 'checked' : ''}>
            <label for="show-completed">显示已完成</label>
        `;
        
        // 添加复选框事件监听
        const checkbox = showCompletedContainer.querySelector('input');
        checkbox.addEventListener('change', (e) => {
            onShowCompletedChange(e.target.checked);
        });
        
        bottomControls.appendChild(showCompletedContainer);

        // 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', onShowAll);
        bottomControls.appendChild(showAllButton);

        // 将树内容和底部控制区域添加到树容器
        treeContainer.appendChild(treeContent);
        treeContainer.appendChild(bottomControls);

        return treeContainer;
    }
}

export default TodoTree;