// 路径导航模块（面包屑导航）

class PathNavigator {
    constructor(options) {
        // 面包屑容器元素
        this.container = options.container;
        
        // 根目录名称
        this.rootName = options.rootName || '全部文件';
        
        // 当前路径
        this.currentPath = '';
        
        // 路径变化回调
        this.onNavigate = options.onNavigate || null;
        
        this.init();
    }

    init() {
        this.bindEvents();
        this.render();
    }

    bindEvents() {
        // 面包屑点击事件
        this.container.addEventListener('click', (e) => {
            if (e.target.classList.contains('breadcrumb-item')) {
                const path = e.target.dataset.path;
                this.navigateTo(path);
            }
        });
    }

    // 导航到指定路径
    navigateTo(path) {
        if (this.currentPath === path) return;
        
        this.currentPath = path;
        this.render();
        
        // 触发回调
        if (this.onNavigate) {
            this.onNavigate(path);
        }
    }

    // 获取当前路径
    getPath() {
        return this.currentPath;
    }

    // 设置路径（不触发回调，仅更新显示）
    setPath(path) {
        this.currentPath = path;
        this.render();
    }

    // 渲染面包屑
    render() {
        this.container.innerHTML = '';

        // 添加根目录
        const rootItem = document.createElement('span');
        rootItem.className = 'breadcrumb-item';
        rootItem.textContent = this.rootName;
        rootItem.dataset.path = '';
        if (this.currentPath === '') {
            rootItem.classList.add('active');
        }
        this.container.appendChild(rootItem);

        // 添加路径中的各个部分
        if (this.currentPath) {
            const parts = this.currentPath.split('/').filter(p => p);
            let accumulatedPath = '';

            parts.forEach((part, index) => {
                accumulatedPath += part;
                
                const item = document.createElement('span');
                item.className = 'breadcrumb-item';
                item.textContent = part;
                item.dataset.path = accumulatedPath;
                
                if (index === parts.length - 1) {
                    item.classList.add('active');
                }
                
                this.container.appendChild(item);
                
                if (index < parts.length - 1) {
                    accumulatedPath += '/';
                }
            });
        }
    }

    // 返回上一级
    goUp() {
        if (!this.currentPath) return;
        
        const parts = this.currentPath.split('/').filter(p => p);
        parts.pop();
        const parentPath = parts.join('/');
        
        this.navigateTo(parentPath);
    }

    // 进入子目录
    goInto(folderName) {
        const newPath = this.currentPath 
            ? `${this.currentPath}/${folderName}`
            : folderName;
        
        this.navigateTo(newPath);
    }

    // 回到根目录
    goRoot() {
        this.navigateTo('');
    }

    // 获取当前目录名
    getCurrentFolderName() {
        if (!this.currentPath) return this.rootName;
        const parts = this.currentPath.split('/').filter(p => p);
        return parts[parts.length - 1] || this.rootName;
    }

    // 获取父目录路径
    getParentPath() {
        if (!this.currentPath) return '';
        const parts = this.currentPath.split('/').filter(p => p);
        parts.pop();
        return parts.join('/');
    }

    // 判断是否在根目录
    isAtRoot() {
        return this.currentPath === '';
    }
}