"use strict";

const fspath = require("path");

var pathOperation = {
    log : console.log,

    /**
     * @descriptionCn 相对路径转绝对路径
     * @descriptionEn turn relative path to absolute path
     * @param {String} curPath current file path
     * @param {String} path the path which is included in the current file
     * @returns absolute path
     */
    rel2abs : function (curPath, path) {
        // check whether it is absolute
        if (fspath.isAbsolute(path)) {
            return path;
        }
        let parent = fspath.dirname(curPath);
        let absPath = fspath.resolve(parent, path);
        return absPath.replace(/\\/g,"\/");
    },

    /**
     * @descriptionCn 获取文件的后缀
     * @descriptionEn get the extname of path
     * @param {String} path the path which is included in the current file
     * @returns the extname of path e.g. : ".txt"
     */
    extname : function (path) {
        return fspath.extname(path).toLowerCase();
    },

    basename : function (path) {
        return fspath.basename(path);
    },
    
    /**
     * @descriptionEn Multiple times return the directory name of a path.
     * @descriptionCn 往上进行指定次数的父级路径查找
     * @param {String} path  初始文件路径
     * @param {Number} times 往上查找的次数，省缺时指定为一次
     * @returns {String} 返回对应的父级路径
     */
    dirname : function (path, times) {
        let dirPath = path;

        if (!times) {
            dirPath = fspath.dirname(dirPath);
            return dirPath;
        }

        for (let i = 0; i < times; i++) {
            dirPath = fspath.dirname(dirPath);
        }

        return dirPath;
    }
}
module.exports = pathOperation;