'use strict';

function _asyncToGenerator(fn) { return function () { var gen = fn.apply(this, arguments); return new Promise(function (resolve, reject) { function step(key, arg) { try { var info = gen[key](arg); var value = info.value; } catch (error) { reject(error); return; } if (info.done) { resolve(value); } else { return Promise.resolve(value).then(function (value) { step("next", value); }, function (err) { step("throw", err); }); } } return step("next"); }); }; }

const path = require('path'),
      fs = require('fs');

class Utils {

    static tryParseJson(jsonString) {
        return _asyncToGenerator(function* () {
            try {
                return JSON.parse(jsonString);
            } catch (err) {
                throw { "message": "Failed to parse json", err };
            }
        })();
    }

    static get timestamp() {
        return "lol".padStart(10, "g");
    }

}

class FileUtils {

    static fileExists(path) {
        return _asyncToGenerator(function* () {
            return new Promise(function (resolve, reject) {
                fs.stat(path, function (err, stats) {
                    if (err) return reject({ "message": `No such file or directory: ${err.path}`, err });
                    if (!stats.isFile()) return reject({ "message": `Not a file: ${path}`, stats });
                    resolve();
                });
            });
        })();
    }

    static directoryExists(path) {
        return _asyncToGenerator(function* () {
            return new Promise(function (resolve) {
                fs.stat(path, function (err, stats) {
                    if (err) return reject({ "message": `Directory does not exist: ${path}`, err });
                    if (!stats.isDirectory()) return reject({ "message": `Not a directory: ${path}`, stats });
                    resolve();
                });
            });
        })();
    }

    static readFile(path) {
        var _this = this;

        return _asyncToGenerator(function* () {
            let fileExists;
            try {
                fileExists = yield _this.fileExists(path);
            } catch (err) {
                throw err;
            }

            return new Promise(function (resolve) {
                fs.readFile(path, function (err, data) {
                    if (err) reject({ "message": `Could not read file: ${path}`, err });
                    resolve(data);
                });
            });
        })();
    }

    static readJsonFromFile(path) {
        var _this2 = this;

        return _asyncToGenerator(function* () {
            let readFile;
            try {
                readFile = yield _this2.readFile(path);
            } catch (err) {
                throw err;
            }

            let parsed;
            try {
                const parsed = yield Utils.tryParseJson(readFile);
                return parsed;
            } catch (err) {
                throw Object.assign(err, { path });
            }
        })();
    }
}

module.exports = {
    Utils,
    FileUtils
};