const Fs = require('fs');
const Path = require('path');

/**
 * 文件工具
 */
const FileUtil = {

   
    /**
     * 复制文件/文件夹
     * @param {Fs.PathLike} srcPath 源路径
     * @param {Fs.PathLike} destPath 目标路径
     */
    copy(srcPath, destPath) {
        if (!Fs.existsSync(srcPath)) return;
        const stats = Fs.statSync(srcPath);
        if (stats.isDirectory()) {
            if (!Fs.existsSync(destPath)) Fs.mkdirSync(destPath);
            const names = Fs.readdirSync(srcPath);
            for (const name of names) {
                this.copy(Path.join(srcPath, name), Path.join(destPath, name));
            }
        } else if (stats.isFile()) {
            Fs.writeFileSync(destPath, Fs.readFileSync(srcPath));
        }
    },

    /**
     * 删除文件/文件夹
     * @param {Fs.PathLike} path 路径
     */
    delete(path) {
        if (!Fs.existsSync(path)) return;
        const stats = Fs.statSync(path);
        if (stats.isDirectory()) {
            const names = Fs.readdirSync(path);
            for (const name of names) {
                this.delete(Path.join(path, name));
            }
            Fs.rmdirSync(path);
        } else if (stats.isFile()) {
            Fs.unlinkSync(path);
        }
    },

    /**
     * 遍历文件/文件夹并执行函数
     * @param {Fs.PathLike} path 路径
     * @param {(filePath: Fs.PathLike, stat: Fs.Stats) => void} handler 处理函数
     */
    map(path, handler) {
        if (!Fs.existsSync(path)) return
        const stats = Fs.statSync(path);
        if (stats.isDirectory()) {
            const names = Fs.readdirSync(path);
            for (const name of names) {
                this.map(Path.join(path, name), handler);
            }
        } else if (stats.isFile()) {
            handler(path, stats);
        }
    },

     // 递归创建目录 同步方法
     mkdirsSync(dirname) {
        if (Fs.existsSync(dirname)) {
            return true;
        } else {
            if (this.mkdirsSync(path.dirname(dirname))) {
                Fs.mkdirSync(dirname);
                return true;
            }
        }
    }, 


    //同步读取文件
    readFileSync: function (path) {
        return Fs.readFileSync(path, 'utf-8');
    },

    /**
     * 异步写文件
     * _path 路径
     * _msg  数据
     */
    writeFile: function (_path, _msg) {
        Fs.writeFile(_path, _msg, function (err) {
            if (err) throw err;
        })
    },

    /**
     * 是否路径
     */
    isPath: function (path) {
        return Fs.existsSync(path);
    }, 


    /**
     * 获取文件夹名字
     */
    getDirName(f){ 
        return path.dirname(f)
    },


    /**
     * 获取文件名字
     * type: 1  只获取文件名字
     *       2  获取文件后缀
     *      其他  获取文件名.后缀
     */
    getFilename(filepath = () => { throw new  Error }, type = 1) { 
        let result = '';
        if (type === 1) {
            result = path.basename(filepath);
        } else if (type === 2) {
            result = path.extname(filepath);
        } else {
            let basename = path.basename(filepath);
            let extname = path.extname(filepath);
            result = basename.substring(0, basename.indexOf(extname));
        }
        return result;
    },

}

module.exports = FileUtil;