const Utils = require("./util");
const pth = require("path");
const ZipEntry = require("./zipEntry");
const ZipFile = require("./zipFile");

const get_Bool = (...val) => Utils.findLast(val, (c) => typeof c === "boolean");
const get_Str = (...val) => Utils.findLast(val, (c) => typeof c === "string");
const get_Fun = (...val) => Utils.findLast(val, (c) => typeof c === "function");

const defaultOptions = {
    // option "noSort" : if true it disables files sorting
    noSort: false,
    // read entries during load (initial loading may be slower)
    readEntries: false,
    // default method is none
    method: Utils.Constants.NONE,
    // file system
    fs: null
};

module.exports = function (/**String*/ input, /** object */ options) {
    let inBuffer = null;

    // create object based default options, allowing them to be overwritten
    const opts = Object.assign(Object.create(null), defaultOptions);

    // test input variable
    if (input && "object" === typeof input) {
        // if value is not buffer we accept it to be object with options
        if (!(input instanceof Uint8Array)) {
            Object.assign(opts, input);
            input = opts.input ? opts.input : undefined;
            if (opts.input) delete opts.input;
        }

        // if input is buffer
        if (Buffer.isBuffer(input)) {
            inBuffer = input;
            opts.method = Utils.Constants.BUFFER;
            input = undefined;
        }
    }

    // assign options
    Object.assign(opts, options);

    // instanciate utils filesystem
    const filetools = new Utils(opts);

    if (typeof opts.decoder !== "object" || typeof opts.decoder.encode !== "function" || typeof opts.decoder.decode !== "function") {
        opts.decoder = Utils.decoder;
    }

    // if input is file name we retrieve its content
    if (input && "string" === typeof input) {
        // load zip file
        if (filetools.fs.existsSync(input)) {
            opts.method = Utils.Constants.FILE;
            opts.filename = input;
            inBuffer = filetools.fs.readFileSync(input);
        } else {
            throw Utils.Errors.INVALID_FILENAME();
        }
    }

    // create variable
    const _zip = new ZipFile(inBuffer, opts);

    const { canonical, sanitize, zipnamefix } = Utils;

    function getEntry(/**Object*/ entry) {
        if (entry && _zip) {
            var item;
            // If entry was given as a file name
            if (typeof entry === "string") item = _zip.getEntry(pth.posix.normalize(entry));
            // if entry was given as a ZipEntry object
            if (typeof entry === "object" && typeof entry.entryName !== "undefined" && typeof entry.header !== "undefined") item = _zip.getEntry(entry.entryName);

            if (item) {
                return item;
            }
        }
        return null;
    }

    function fixPath(zipPath) {
        const { join, normalize, sep } = pth.posix;
        // convert windows file separators and normalize
        return join(".", normalize(sep + zipPath.split("\\").join(sep) + sep));
    }

    function filenameFilter(filterfn) {
        if (filterfn instanceof RegExp) {
            // if filter is RegExp wrap it
            return (function (rx) {
                return function (filename) {
                    return rx.test(filename);
                };
            })(filterfn);
        } else if ("function" !== typeof filterfn) {
            // if filter is not function we will replace it
            return () => true;
        }
        return filterfn;
    }

    // keep last character on folders
    const relativePath = (local, entry) => {
        let lastChar = entry.slice(-1);
        lastChar = lastChar === filetools.sep ? filetools.sep : "";
        return pth.relative(local, entry) + lastChar;
    };

    return {
        /**
         * Extracts the given entry from the archive and returns the content as a Buffer object
         * @param {ZipEntry|string} entry ZipEntry object or String with the full path of the entry
         * @param {Buffer|string} [pass] - password
         * @return Buffer or Null in case of error
         */
        readFile: function (entry, pass) {
            var item = getEntry(entry);
            return (item && item.getData(pass)) || null;
        },

        /**
         * Returns how many child elements has on entry (directories) on files it is always 0
         * @param {ZipEntry|string} entry ZipEntry object or String with the full path of the entry
         * @returns {integer}
         */
        childCount: function (entry) {
            const item = getEntry(entry);
            if (item) {
                return _zip.getChildCount(item);
            }
        },

        /**
         * Asynchronous readFile
         * @param {ZipEntry|string} entry ZipEntry object or String with the full path of the entry
         * @param {callback} callback
         *
         * @return Buffer or Null in case of error
         */
        readFileAsync: function (entry, callback) {
            var item = getEntry(entry);
            if (item) {
                item.getDataAsync(callback);
            } else {
                callback(null, "getEntry failed for:" + entry);
            }
        },

        /**
         * Extracts the given entry from the archive and returns the content as plain text in the given encoding
         * @param {ZipEntry|string} entry - ZipEntry object or String with the full path of the entry
         * @param {string} encoding - Optional. If no encoding is specified utf8 is used
         *
         * @return String
         */
        readAsText: function (entry, encoding) {
            var item = getEntry(entry);
            if (item) {
                var data = item.getData();
                if (data && data.length) {
                    return data.toString(encoding || "utf8");
                }
            }
            return "";
        },

        /**
         * Asynchronous readAsText
         * @param {ZipEntry|string} entry ZipEntry object or String with the full path of the entry
         * @param {callback} callback
         * @param {string} [encoding] - Optional. If no encoding is specified utf8 is used
         *
         * @return String
         */
        readAsTextAsync: function (entry, callback, encoding) {
            var item = getEntry(entry);
            if (item) {
                item.getDataAsync(function (data, err) {
                    if (err) {
                        callback(data, err);
                        return;
                    }

                    if (data && data.length) {
                        callback(data.toString(encoding || "utf8"));
                    } else {
                        callback("");
                    }
                });
            } else {
                callback("");
            }
        },

        /**
         * Remove the entry from the file or the entry and all it's nested directories and files if the given entry is a directory
         *
         * @param {ZipEntry|string} entry
         * @returns {void}
         */
        deleteFile: function (entry, withsubfolders = true) {
            // @TODO: test deleteFile
            var item = getEntry(entry);
            if (item) {
                _zip.deleteFile(item.entryName, withsubfolders);
            }
        },

        /**
         * Remove the entry from the file or directory without affecting any nested entries
         *
         * @param {ZipEntry|string} entry
         * @returns {void}
         */
        deleteEntry: function (entry) {
            // @TODO: test deleteEntry
            var item = getEntry(entry);
            if (item) {
                _zip.deleteEntry(item.entryName);
            }
        },

        /**
         * Adds a comment to the zip. The zip must be rewritten after adding the comment.
         *
         * @param {string} comment
         */
        addZipComment: function (comment) {
            // @TODO: test addZipComment
            _zip.comment = comment;
        },

        /**
         * Returns the zip comment
         *
         * @return String
         */
        getZipComment: function () {
            return _zip.comment || "";
        },

        /**
         * Adds a comment to a specified zipEntry. The zip must be rewritten after adding the comment
         * The comment cannot exceed 65535 characters in length
         *
         * @param {ZipEntry} entry
         * @param {string} comment
         */
        addZipEntryComment: function (entry, comment) {
            var item = getEntry(entry);
            if (item) {
                item.comment = comment;
            }
        },

        /**
         * Returns the comment of the specified entry
         *
         * @param {ZipEntry} entry
         * @return String
         */
        getZipEntryComment: function (entry) {
            var item = getEntry(entry);
            if (item) {
                return item.comment || "";
            }
            return "";
        },

        /**
         * Updates the content of an existing entry inside the archive. The zip must be rewritten after updating the content
         *
         * @param {ZipEntry} entry
         * @param {Buffer} content
         */
        updateFile: function (entry, content) {
            var item = getEntry(entry);
            if (item) {
                item.setData(content);
            }
        },

        /**
         * Adds a file from the disk to the archive
         *
         * @param {string} localPath File to add to zip
         * @param {string} [zipPath] Optional path inside the zip
         * @param {string} [zipName] Optional name for the file
         * @param {string} [comment] Optional file comment
         */
        addLocalFile: function (localPath, zipPath, zipName, comment) {
            if (filetools.fs.existsSync(localPath)) {
                // fix ZipPath
                zipPath = zipPath ? fixPath(zipPath) : "";

                // p - local file name
                const p = pth.win32.basename(pth.win32.normalize(localPath));

                // add file name into zippath
                zipPath += zipName ? zipName : p;

                // read file attributes
                const _attr = filetools.fs.statSync(localPath);

                // get file content
                const data = _attr.isFile() ? filetools.fs.readFileSync(localPath) : Buffer.alloc(0);

                // if folder
                if (_attr.isDirectory()) zipPath += filetools.sep;

                // add file into zip file
                this.addFile(zipPath, data, comment, _attr);
            } else {
                throw Utils.Errors.FILE_NOT_FOUND(localPath);
            }
        },

        /**
         * Callback for showing if everything was done.
         *
         * @callback doneCallback
         * @param {Error} err - Error object
         * @param {boolean} done - was request fully completed
         */

        /**
         * Adds a file from the disk to the archive
         *
         * @param {(object|string)} options - options object, if it is string it us used as localPath.
         * @param {string} options.localPath - Local path to the file.
         * @param {string} [options.comment] - Optional file comment.
         * @param {string} [options.zipPath] - Optional path inside the zip
         * @param {string} [options.zipName] - Optional name for the file
         * @param {doneCallback} callback - The callback that handles the response.
         */
        addLocalFileAsync: function (options, callback) {
            options = typeof options === "object" ? options : { localPath: options };
            const localPath = pth.resolve(options.localPath);
            const { comment } = options;
            let { zipPath, zipName } = options;
            const self = this;

            filetools.fs.stat(localPath, function (err, stats) {
                if (err) return callback(err, false);
                // fix ZipPath
                zipPath = zipPath ? fixPath(zipPath) : "";
                // p - local file name
                const p = pth.win32.basename(pth.win32.normalize(localPath));
                // add file name into zippath
                zipPath += zipName ? zipName : p;

                if (stats.isFile()) {
                    filetools.fs.readFile(localPath, function (err, data) {
                        if (err) return callback(err, false);
                        self.addFile(zipPath, data, comment, stats);
                        return setImmediate(callback, undefined, true);
                    });
                } else if (stats.isDirectory()) {
                    zipPath += filetools.sep;
                    self.addFile(zipPath, Buffer.alloc(0), comment, stats);
                    return setImmediate(callback, undefined, true);
                }
            });
        },

        /**
         * Adds a local directory and all its nested files and directories to the archive
         *
         * @param {string} localPath - local path to the folder
         * @param {string} [zipPath] - optional path inside zip
         * @param {(RegExp|function)} [filter] - optional RegExp or Function if files match will be included.
         */
        addLocalFolder: function (localPath, zipPath, filter) {
            // Prepare filter
            filter = filenameFilter(filter);

            // fix ZipPath
            zipPath = zipPath ? fixPath(zipPath) : "";

            // normalize the path first
            localPath = pth.normalize(localPath);

            if (filetools.fs.existsSync(localPath)) {
                const items = filetools.findFiles(localPath);
                const self = this;

                if (items.length) {
                    for (const filepath of items) {
                        const p = pth.join(zipPath, relativePath(localPath, filepath));
                        if (filter(p)) {
                            self.addLocalFile(filepath, pth.dirname(p));
                        }
                    }
                }
            } else {
                throw Utils.Errors.FILE_NOT_FOUND(localPath);
            }
        },

        /**
         * Asynchronous addLocalFolder
         * @param {string} localPath
         * @param {callback} callback
         * @param {string} [zipPath] optional path inside zip
         * @param {RegExp|function} [filter] optional RegExp or Function if files match will
         *               be included.
         */
        addLocalFolderAsync: function (localPath, callback, zipPath, filter) {
            // Prepare filter
            filter = filenameFilter(filter);

            // fix ZipPath
            zipPath = zipPath ? fixPath(zipPath) : "";

            // normalize the path first
            localPath = pth.normalize(localPath);

            var self = this;
            filetools.fs.open(localPath, "r", function (err) {
                if (err && err.code === "ENOENT") {
                    callback(undefined, Utils.Errors.FILE_NOT_FOUND(localPath));
                } else if (err) {
                    callback(undefined, err);
                } else {
                    var items = filetools.findFiles(localPath);
                    var i = -1;

                    var next = function () {
                        i += 1;
                        if (i < items.length) {
                            var filepath = items[i];
                            var p = relativePath(localPath, filepath).split("\\").join("/"); //windows fix
                            p = p
                                .normalize("NFD")
                                .replace(/[\u0300-\u036f]/g, "")
                                .replace(/[^\x20-\x7E]/g, ""); // accent fix
                            if (filter(p)) {
                                filetools.fs.stat(filepath, function (er0, stats) {
                                    if (er0) callback(undefined, er0);
                                    if (stats.isFile()) {
                                        filetools.fs.readFile(filepath, function (er1, data) {
                                            if (er1) {
                                                callback(undefined, er1);
                                            } else {
                                                self.addFile(zipPath + p, data, "", stats);
                                                next();
                                            }
                                        });
                                    } else {
                                        self.addFile(zipPath + p + "/", Buffer.alloc(0), "", stats);
                                        next();
                                    }
                                });
                            } else {
                                process.nextTick(() => {
                                    next();
                                });
                            }
                        } else {
                            callback(true, undefined);
                        }
                    };

                    next();
                }
            });
        },

        /**
         * Adds a local directory and all its nested files and directories to the archive
         *
         * @param {object | string} options - options object, if it is string it us used as localPath.
         * @param {string} options.localPath - Local path to the folder.
         * @param {string} [options.zipPath] - optional path inside zip.
         * @param {RegExp|function} [options.filter] - optional RegExp or Function if files match will be included.
         * @param {function|string} [options.namefix] - optional function to help fix filename
         * @param {doneCallback} callback - The callback that handles the response.
         *
         */
        addLocalFolderAsync2: function (options, callback) {
            const self = this;
            options = typeof options === "object" ? options : { localPath: options };
            localPath = pth.resolve(fixPath(options.localPath));
            let { zipPath, filter, namefix } = options;

            if (filter instanceof RegExp) {
                filter = (function (rx) {
                    return function (filename) {
                        return rx.test(filename);
                    };
                })(filter);
            } else if ("function" !== typeof filter) {
                filter = function () {
                    return true;
                };
            }

            // fix ZipPath
            zipPath = zipPath ? fixPath(zipPath) : "";

            // Check Namefix function
            if (namefix == "latin1") {
                namefix = (str) =>
                    str
                        .normalize("NFD")
                        .replace(/[\u0300-\u036f]/g, "")
                        .replace(/[^\x20-\x7E]/g, ""); // accent fix (latin1 characers only)
            }

            if (typeof namefix !== "function") namefix = (str) => str;

            // internal, create relative path + fix the name
            const relPathFix = (entry) => pth.join(zipPath, namefix(relativePath(localPath, entry)));
            const fileNameFix = (entry) => pth.win32.basename(pth.win32.normalize(namefix(entry)));

            filetools.fs.open(localPath, "r", function (err) {
                if (err && err.code === "ENOENT") {
                    callback(undefined, Utils.Errors.FILE_NOT_FOUND(localPath));
                } else if (err) {
                    callback(undefined, err);
                } else {
                    filetools.findFilesAsync(localPath, function (err, fileEntries) {
                        if (err) return callback(err);
                        fileEntries = fileEntries.filter((dir) => filter(relPathFix(dir)));
                        if (!fileEntries.length) callback(undefined, false);

                        setImmediate(
                            fileEntries.reverse().reduce(function (next, entry) {
                                return function (err, done) {
                                    if (err || done === false) return setImmediate(next, err, false);

                                    self.addLocalFileAsync(
                                        {
                                            localPath: entry,
                                            zipPath: pth.dirname(relPathFix(entry)),
                                            zipName: fileNameFix(entry)
                                        },
                                        next
                                    );
                                };
                            }, callback)
                        );
                    });
                }
            });
        },

        /**
         * Adds a local directory and all its nested files and directories to the archive
         *
         * @param {string} localPath - path where files will be extracted
         * @param {object} props - optional properties
         * @param {string} [props.zipPath] - optional path inside zip
         * @param {RegExp|function} [props.filter] - optional RegExp or Function if files match will be included.
         * @param {function|string} [props.namefix] - optional function to help fix filename
         */
        addLocalFolderPromise: function (localPath, props) {
            return new Promise((resolve, reject) => {
                this.addLocalFolderAsync2(Object.assign({ localPath }, props), (err, done) => {
                    if (err) reject(err);
                    if (done) resolve(this);
                });
            });
        },

        /**
         * Allows you to create a entry (file or directory) in the zip file.
         * If you want to create a directory the entryName must end in / and a null buffer should be provided.
         * Comment and attributes are optional
         *
         * @param {string} entryName
         * @param {Buffer | string} content - file content as buffer or utf8 coded string
         * @param {string} [comment] - file comment
         * @param {number | object} [attr] - number as unix file permissions, object as filesystem Stats object
         */
        addFile: function (entryName, content, comment, attr) {
            entryName = zipnamefix(entryName);
            let entry = getEntry(entryName);
            const update = entry != null;

            // prepare new entry
            if (!update) {
                entry = new ZipEntry(opts);
                entry.entryName = entryName;
            }
            entry.comment = comment || "";

            const isStat = "object" === typeof attr && attr instanceof filetools.fs.Stats;

            // last modification time from file stats
            if (isStat) {
                entry.header.time = attr.mtime;
            }

            // Set file attribute
            var fileattr = entry.isDirectory ? 0x10 : 0; // (MS-DOS directory flag)

            // extended attributes field for Unix
            // set file type either S_IFDIR / S_IFREG
            let unix = entry.isDirectory ? 0x4000 : 0x8000;

            if (isStat) {
                // File attributes from file stats
                unix |= 0xfff & attr.mode;
            } else if ("number" === typeof attr) {
                // attr from given attr values
                unix |= 0xfff & attr;
            } else {
                // Default values:
                unix |= entry.isDirectory ? 0o755 : 0o644; // permissions (drwxr-xr-x) or (-r-wr--r--)
            }

            fileattr = (fileattr | (unix << 16)) >>> 0; // add attributes

            entry.attr = fileattr;

            entry.setData(content);
            if (!update) _zip.setEntry(entry);

            return entry;
        },

        /**
         * Returns an array of ZipEntry objects representing the files and folders inside the archive
         *
         * @param {string} [password]
         * @returns Array
         */
        getEntries: function (password) {
            _zip.password = password;
            return _zip ? _zip.entries : [];
        },

        /**
         * Returns a ZipEntry object representing the file or folder specified by ``name``.
         *
         * @param {string} name
         * @return ZipEntry
         */
        getEntry: function (/**String*/ name) {
            return getEntry(name);
        },

        getEntryCount: function () {
            return _zip.getEntryCount();
        },

        forEach: function (callback) {
            return _zip.forEach(callback);
        },

        /**
         * Extracts the given entry to the given targetPath
         * If the entry is a directory inside the archive, the entire directory and it's subdirectories will be extracted
         *
         * @param {string|ZipEntry} entry - ZipEntry object or String with the full path of the entry
         * @param {string} targetPath - Target folder where to write the file
         * @param {boolean} [maintainEntryPath=true] - If maintainEntryPath is true and the entry is inside a folder, the entry folder will be created in targetPath as well. Default is TRUE
         * @param {boolean} [overwrite=false] - If the file already exists at the target path, the file will be overwriten if this is true.
         * @param {boolean} [keepOriginalPermission=false] - The file will be set as the permission from the entry if this is true.
         * @param {string} [outFileName] - String If set will override the filename of the extracted file (Only works if the entry is a file)
         *
         * @return Boolean
         */
        extractEntryTo: function (entry, targetPath, maintainEntryPath, overwrite, keepOriginalPermission, outFileName) {
            overwrite = get_Bool(false, overwrite);
            keepOriginalPermission = get_Bool(false, keepOriginalPermission);
            maintainEntryPath = get_Bool(true, maintainEntryPath);
            outFileName = get_Str(keepOriginalPermission, outFileName);

            var item = getEntry(entry);
            if (!item) {
                throw Utils.Errors.NO_ENTRY();
            }

            var entryName = canonical(item.entryName);

            var target = sanitize(targetPath, outFileName && !item.isDirectory ? outFileName : maintainEntryPath ? entryName : pth.basename(entryName));

            if (item.isDirectory) {
                var children = _zip.getEntryChildren(item);
                children.forEach(function (child) {
                    if (child.isDirectory) return;
                    var content = child.getData();
                    if (!content) {
                        throw Utils.Errors.CANT_EXTRACT_FILE();
                    }
                    var name = canonical(child.entryName);
                    var childName = sanitize(targetPath, maintainEntryPath ? name : pth.basename(name));
                    // The reverse operation for attr depend on method addFile()
                    const fileAttr = keepOriginalPermission ? child.header.fileAttr : undefined;
                    filetools.writeFileTo(childName, content, overwrite, fileAttr);
                });
                return true;
            }

            var content = item.getData(_zip.password);
            if (!content) throw Utils.Errors.CANT_EXTRACT_FILE();

            if (filetools.fs.existsSync(target) && !overwrite) {
                throw Utils.Errors.CANT_OVERRIDE();
            }
            // The reverse operation for attr depend on method addFile()
            const fileAttr = keepOriginalPermission ? entry.header.fileAttr : undefined;
            filetools.writeFileTo(target, content, overwrite, fileAttr);

            return true;
        },

        /**
         * Test the archive
         * @param {string} [pass]
         */
        test: function (pass) {
            if (!_zip) {
                return false;
            }

            for (var entry in _zip.entries) {
                try {
                    if (entry.isDirectory) {
                        continue;
                    }
                    var content = _zip.entries[entry].getData(pass);
                    if (!content) {
                        return false;
                    }
                } catch (err) {
                    return false;
                }
            }
            return true;
        },

        /**
         * Extracts the entire archive to the given location
         *
         * @param {string} targetPath Target location
         * @param {boolean} [overwrite=false] If the file already exists at the target path, the file will be overwriten if this is true.
         *                  Default is FALSE
         * @param {boolean} [keepOriginalPermission=false] The file will be set as the permission from the entry if this is true.
         *                  Default is FALSE
         * @param {string|Buffer} [pass] password
         */
        extractAllTo: function (targetPath, overwrite, keepOriginalPermission, pass) {
            keepOriginalPermission = get_Bool(false, keepOriginalPermission);
            pass = get_Str(keepOriginalPermission, pass);
            overwrite = get_Bool(false, overwrite);
            if (!_zip) throw Utils.Errors.NO_ZIP();

            _zip.entries.forEach(function (entry) {
                var entryName = sanitize(targetPath, canonical(entry.entryName));
                if (entry.isDirectory) {
                    filetools.makeDir(entryName);
                    return;
                }
                var content = entry.getData(pass);
                if (!content) {
                    throw Utils.Errors.CANT_EXTRACT_FILE();
                }
                // The reverse operation for attr depend on method addFile()
                const fileAttr = keepOriginalPermission ? entry.header.fileAttr : undefined;
                filetools.writeFileTo(entryName, content, overwrite, fileAttr);
                try {
                    filetools.fs.utimesSync(entryName, entry.header.time, entry.header.time);
                } catch (err) {
                    throw Utils.Errors.CANT_EXTRACT_FILE();
                }
            });
        },

        /**
         * Asynchronous extractAllTo
         *
         * @param {string} targetPath Target location
         * @param {boolean} [overwrite=false] If the file already exists at the target path, the file will be overwriten if this is true.
         *                  Default is FALSE
         * @param {boolean} [keepOriginalPermission=false] The file will be set as the permission from the entry if this is true.
         *                  Default is FALSE
         * @param {function} callback The callback will be executed when all entries are extracted successfully or any error is thrown.
         */
        extractAllToAsync: function (targetPath, overwrite, keepOriginalPermission, callback) {
            callback = get_Fun(overwrite, keepOriginalPermission, callback);
            keepOriginalPermission = get_Bool(false, keepOriginalPermission);
            overwrite = get_Bool(false, overwrite);
            if (!callback) {
                return new Promise((resolve, reject) => {
                    this.extractAllToAsync(targetPath, overwrite, keepOriginalPermission, function (err) {
                        if (err) {
                            reject(err);
                        } else {
                            resolve(this);
                        }
                    });
                });
            }
            if (!_zip) {
                callback(Utils.Errors.NO_ZIP());
                return;
            }

            targetPath = pth.resolve(targetPath);
            // convert entryName to
            const getPath = (entry) => sanitize(targetPath, pth.normalize(canonical(entry.entryName)));
            const getError = (msg, file) => new Error(msg + ': "' + file + '"');

            // separate directories from files
            const dirEntries = [];
            const fileEntries = [];
            _zip.entries.forEach((e) => {
                if (e.isDirectory) {
                    dirEntries.push(e);
                } else {
                    fileEntries.push(e);
                }
            });

            // Create directory entries first synchronously
            // this prevents race condition and assures folders are there before writing files
            for (const entry of dirEntries) {
                const dirPath = getPath(entry);
                // The reverse operation for attr depend on method addFile()
                const dirAttr = keepOriginalPermission ? entry.header.fileAttr : undefined;
                try {
                    filetools.makeDir(dirPath);
                    if (dirAttr) filetools.fs.chmodSync(dirPath, dirAttr);
                    // in unix timestamp will change if files are later added to folder, but still
                    filetools.fs.utimesSync(dirPath, entry.header.time, entry.header.time);
                } catch (er) {
                    callback(getError("Unable to create folder", dirPath));
                }
            }

            fileEntries.reverse().reduce(function (next, entry) {
                return function (err) {
                    if (err) {
                        next(err);
                    } else {
                        const entryName = pth.normalize(canonical(entry.entryName));
                        const filePath = sanitize(targetPath, entryName);
                        entry.getDataAsync(function (content, err_1) {
                            if (err_1) {
                                next(err_1);
                            } else if (!content) {
                                next(Utils.Errors.CANT_EXTRACT_FILE());
                            } else {
                                // The reverse operation for attr depend on method addFile()
                                const fileAttr = keepOriginalPermission ? entry.header.fileAttr : undefined;
                                filetools.writeFileToAsync(filePath, content, overwrite, fileAttr, function (succ) {
                                    if (!succ) {
                                        next(getError("Unable to write file", filePath));
                                    }
                                    filetools.fs.utimes(filePath, entry.header.time, entry.header.time, function (err_2) {
                                        if (err_2) {
                                            next(getError("Unable to set times", filePath));
                                        } else {
                                            next();
                                        }
                                    });
                                });
                            }
                        });
                    }
                };
            }, callback)();
        },

        /**
         * Writes the newly created zip file to disk at the specified location or if a zip was opened and no ``targetFileName`` is provided, it will overwrite the opened zip
         *
         * @param {string} targetFileName
         * @param {function} callback
         */
        writeZip: function (targetFileName, callback) {
            if (arguments.length === 1) {
                if (typeof targetFileName === "function") {
                    callback = targetFileName;
                    targetFileName = "";
                }
            }

            if (!targetFileName && opts.filename) {
                targetFileName = opts.filename;
            }
            if (!targetFileName) return;

            var zipData = _zip.compressToBuffer();
            if (zipData) {
                var ok = filetools.writeFileTo(targetFileName, zipData, true);
                if (typeof callback === "function") callback(!ok ? new Error("failed") : null, "");
            }
        },

        /**
         *
         * @param {string} targetFileName
         * @param {object} [props]
         * @param {boolean} [props.overwrite=true] If the file already exists at the target path, the file will be overwriten if this is true.
         * @param {boolean} [props.perm] The file will be set as the permission from the entry if this is true.

         * @returns {Promise<void>}
         */
        writeZipPromise: function (/**String*/ targetFileName, /* object */ props) {
            const { overwrite, perm } = Object.assign({ overwrite: true }, props);

            return new Promise((resolve, reject) => {
                // find file name
                if (!targetFileName && opts.filename) targetFileName = opts.filename;
                if (!targetFileName) reject("ADM-ZIP: ZIP File Name Missing");

                this.toBufferPromise().then((zipData) => {
                    const ret = (done) => (done ? resolve(done) : reject("ADM-ZIP: Wasn't able to write zip file"));
                    filetools.writeFileToAsync(targetFileName, zipData, overwrite, perm, ret);
                }, reject);
            });
        },

        /**
         * @returns {Promise<Buffer>} A promise to the Buffer.
         */
        toBufferPromise: function () {
            return new Promise((resolve, reject) => {
                _zip.toAsyncBuffer(resolve, reject);
            });
        },

        /**
         * Returns the content of the entire zip file as a Buffer object
         *
         * @prop {function} [onSuccess]
         * @prop {function} [onFail]
         * @prop {function} [onItemStart]
         * @prop {function} [onItemEnd]
         * @returns {Buffer}
         */
        toBuffer: function (onSuccess, onFail, onItemStart, onItemEnd) {
            if (typeof onSuccess === "function") {
                _zip.toAsyncBuffer(onSuccess, onFail, onItemStart, onItemEnd);
                return null;
            }
            return _zip.compressToBuffer();
        }
    };
};