var Utils = require("./util");
var fs = Utils.FileSystem.require(),
	pth = require("path");

fs.existsSync = fs.existsSync || pth.existsSync;

var ZipEntry = require("./zipEntry"),
	ZipFile = require("./zipFile");

var isWin = /^win/.test(process.platform);


module.exports = function (/*String*/input) {
	var _zip = undefined,
		_filename = "";

	if (input && typeof input === "string") { // load zip file
		if (fs.existsSync(input)) {
			_filename = input;
			_zip = new ZipFile(input, Utils.Constants.FILE);
		} else {
			throw Utils.Errors.INVALID_FILENAME;
		}
	} else if (input && Buffer.isBuffer(input)) { // load buffer
		_zip = new ZipFile(input, Utils.Constants.BUFFER);
	} else { // create new zip file
		_zip = new ZipFile(null, Utils.Constants.NONE);
	}

	function sanitize(prefix, name) {
		prefix = pth.resolve(pth.normalize(prefix));
		var parts = name.split('/');
		for (var i = 0, l = parts.length; i < l; i++) {
			var path = pth.normalize(pth.join(prefix, parts.slice(i, l).join(pth.sep)));
			if (path.indexOf(prefix) === 0) {
				return path;
			}
		}
		return pth.normalize(pth.join(prefix, pth.basename(name)));
	}

	function getEntry(/*Object*/entry) {
		if (entry && _zip) {
			var item;
			// If entry was given as a file name
			if (typeof entry === "string")
				item = _zip.getEntry(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;
	}

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

		/**
		 * Asynchronous readFile
		 * @param entry ZipEntry object or String with the full path of the entry
		 * @param callback
		 *
		 * @return Buffer or Null in case of error
		 */
		readFileAsync: function (/*Object*/entry, /*Function*/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 entry ZipEntry object or String with the full path of the entry
		 * @param encoding Optional. If no encoding is specified utf8 is used
		 *
		 * @return String
		 */
		readAsText: function (/*Object*/entry, /*String - Optional*/encoding) {
			var item = getEntry(entry);
			if (item) {
				var data = item.getData();
				if (data && data.length) {
					return data.toString(encoding || "utf8");
				}
			}
			return "";
		},

		/**
		 * Asynchronous readAsText
		 * @param entry ZipEntry object or String with the full path of the entry
		 * @param callback
		 * @param encoding Optional. If no encoding is specified utf8 is used
		 *
		 * @return String
		 */
		readAsTextAsync: function (/*Object*/entry, /*Function*/callback, /*String - Optional*/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 entry
		 */
		deleteFile: function (/*Object*/entry) { // @TODO: test deleteFile
			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 comment
		 */
		addZipComment: function (/*String*/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 entry
		 * @param comment
		 */
		addZipEntryComment: function (/*Object*/entry, /*String*/comment) {
			var item = getEntry(entry);
			if (item) {
				item.comment = comment;
			}
		},

		/**
		 * Returns the comment of the specified entry
		 *
		 * @param entry
		 * @return String
		 */
		getZipEntryComment: function (/*Object*/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 entry
		 * @param content
		 */
		updateFile: function (/*Object*/entry, /*Buffer*/content) {
			var item = getEntry(entry);
			if (item) {
				item.setData(content);
			}
		},

		/**
		 * Adds a file from the disk to the archive
		 *
		 * @param localPath File to add to zip
		 * @param zipPath Optional path inside the zip
		 * @param zipName Optional name for the file
		 */
		addLocalFile: function (/*String*/localPath, /*String*/zipPath, /*String*/zipName) {
			if (fs.existsSync(localPath)) {
				if (zipPath) {
					zipPath = zipPath.split("\\").join("/");
					if (zipPath.charAt(zipPath.length - 1) !== "/") {
						zipPath += "/";
					}
				} else {
					zipPath = "";
				}
				var p = localPath.split("\\").join("/").split("/").pop();

				if (zipName) {
					this.addFile(zipPath + zipName, fs.readFileSync(localPath), "", 0)
				} else {
					this.addFile(zipPath + p, fs.readFileSync(localPath), "", 0)
				}
			} else {
				throw Utils.Errors.FILE_NOT_FOUND.replace("%s", localPath);
			}
		},

		/**
		 * Adds a local directory and all its nested files and directories to the archive
		 *
		 * @param localPath
		 * @param zipPath optional path inside zip
		 * @param filter optional RegExp or Function if files match will
		 *               be included.
		 */
		addLocalFolder: function (/*String*/localPath, /*String*/zipPath, /*RegExp|Function*/filter) {
			if (filter === undefined) {
				filter = function () {
					return true;
				};
			} else if (filter instanceof RegExp) {
				filter = function (filter) {
					return function (filename) {
						return filter.test(filename);
					}
				}(filter);
			}

			if (zipPath) {
				zipPath = zipPath.split("\\").join("/");
				if (zipPath.charAt(zipPath.length - 1) !== "/") {
					zipPath += "/";
				}
			} else {
				zipPath = "";
			}
			// normalize the path first
			localPath = pth.normalize(localPath);
			localPath = localPath.split("\\").join("/"); //windows fix
			if (localPath.charAt(localPath.length - 1) !== "/")
				localPath += "/";

			if (fs.existsSync(localPath)) {

				var items = Utils.findFiles(localPath),
					self = this;

				if (items.length) {
					items.forEach(function (path) {
						var p = path.split("\\").join("/").replace(new RegExp(localPath.replace(/(\(|\))/g, '\\$1'), 'i'), ""); //windows fix
						if (filter(p)) {
							if (p.charAt(p.length - 1) !== "/") {
								self.addFile(zipPath + p, fs.readFileSync(path), "", 0)
							} else {
								self.addFile(zipPath + p, Buffer.alloc(0), "", 0)
							}
						}
					});
				}
			} else {
				throw Utils.Errors.FILE_NOT_FOUND.replace("%s", localPath);
			}
		},

		/**
		 * 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 entryName
		 * @param content
		 * @param comment
		 * @param attr
		 */
		addFile: function (/*String*/entryName, /*Buffer*/content, /*String*/comment, /*Number*/attr) {
			var entry = new ZipEntry();
			entry.entryName = entryName;
			entry.comment = comment || "";

			if (!attr) {
				if (entry.isDirectory) {
					attr = (0o40755 << 16) | 0x10; // (permissions drwxr-xr-x) + (MS-DOS directory flag)
				} else {
					attr = 0o644 << 16; // permissions -r-wr--r--
				}
			}

			entry.attr = attr;

			entry.setData(content);
			_zip.setEntry(entry);
		},

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

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

		/**
		 * 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 entry ZipEntry object or String with the full path of the entry
		 * @param targetPath Target folder where to write the file
		 * @param maintainEntryPath 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 overwrite If the file already exists at the target path, the file will be overwriten if this is true.
		 *                  Default is FALSE
		 *
		 * @return Boolean
		 */
		extractEntryTo: function (/*Object*/entry, /*String*/targetPath, /*Boolean*/maintainEntryPath, /*Boolean*/overwrite) {
			overwrite = overwrite || false;
			maintainEntryPath = typeof maintainEntryPath === "undefined" ? true : maintainEntryPath;

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

			var entryName = item.entryName;

			var target = sanitize(targetPath, maintainEntryPath ? entryName : pth.basename(entryName));

			if (item.isDirectory) {
				target = pth.resolve(target, "..");
				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 childName = sanitize(targetPath, maintainEntryPath ? child.entryName : pth.basename(child.entryName));

					Utils.writeFileTo(childName, content, overwrite);
				});
				return true;
			}

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

			if (fs.existsSync(target) && !overwrite) {
				throw Utils.Errors.CANT_OVERRIDE;
			}
			Utils.writeFileTo(target, content, overwrite);

			return true;
		},

		/**
		 * Test the archive
		 *
		 */
		test: function () {
			if (!_zip) {
				return false;
			}

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

		/**
		 * Extracts the entire archive to the given location
		 *
		 * @param targetPath Target location
		 * @param overwrite If the file already exists at the target path, the file will be overwriten if this is true.
		 *                  Default is FALSE
		 */
		extractAllTo: function (/*String*/targetPath, /*Boolean*/overwrite) {
			overwrite = overwrite || false;
			if (!_zip) {
				throw Utils.Errors.NO_ZIP;
			}
			_zip.entries.forEach(function (entry) {
				var entryName = sanitize(targetPath, entry.entryName.toString());
				if (entry.isDirectory) {
					Utils.makeDir(entryName);
					return;
				}
				var content = entry.getData();
				if (!content) {
					throw Utils.Errors.CANT_EXTRACT_FILE;
				}
				Utils.writeFileTo(entryName, content, overwrite);
				try {
					fs.utimesSync(entryName, entry.header.time, entry.header.time)
				} catch (err) {
					throw Utils.Errors.CANT_EXTRACT_FILE;
				}
			})
		},

		/**
		 * Asynchronous extractAllTo
		 *
		 * @param targetPath Target location
		 * @param overwrite If the file already exists at the target path, the file will be overwriten if this is true.
		 *                  Default is FALSE
		 * @param callback
		 */
		extractAllToAsync: function (/*String*/targetPath, /*Boolean*/overwrite, /*Function*/callback) {
			if (!callback) {
				callback = function() {}
			}
			overwrite = overwrite || false;
			if (!_zip) {
				callback(new Error(Utils.Errors.NO_ZIP));
				return;
			}

			var entries = _zip.entries;
			var i = entries.length;
			entries.forEach(function (entry) {
				if (i <= 0) return; // Had an error already

				var entryName = pth.normalize(entry.entryName.toString());

				if (entry.isDirectory) {
					Utils.makeDir(sanitize(targetPath, entryName));
					if (--i === 0)
						callback(undefined);
					return;
				}
				entry.getDataAsync(function (content, err) {
					if (i <= 0) return;
					if (err) {
						callback(new Error(err));
						return;
					}
					if (!content) {
						i = 0;
						callback(new Error(Utils.Errors.CANT_EXTRACT_FILE));
						return;
					}

					Utils.writeFileToAsync(sanitize(targetPath, entryName), content, overwrite, function (succ) {
						try {
							fs.utimesSync(pth.resolve(targetPath, entryName), entry.header.time, entry.header.time);
						} catch (err) {
							callback(new Error('Unable to set utimes'));
						}
						if (i <= 0) return;
						if (!succ) {
							i = 0;
							callback(new Error('Unable to write'));
							return;
						}
						if (--i === 0)
							callback(undefined);
					});
				});
			})
		},

		/**
		 * 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 targetFileName
		 * @param callback
		 */
		writeZip: function (/*String*/targetFileName, /*Function*/callback) {
			if (arguments.length === 1) {
				if (typeof targetFileName === "function") {
					callback = targetFileName;
					targetFileName = "";
				}
			}

			if (!targetFileName && _filename) {
				targetFileName = _filename;
			}
			if (!targetFileName) return;

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

		/**
		 * Returns the content of the entire zip file as a Buffer object
		 *
		 * @return Buffer
		 */
		toBuffer: function (/*Function*/onSuccess, /*Function*/onFail, /*Function*/onItemStart, /*Function*/onItemEnd) {
			this.valueOf = 2;
			if (typeof onSuccess === "function") {
				_zip.toAsyncBuffer(onSuccess, onFail, onItemStart, onItemEnd);
				return null;
			}
			return _zip.compressToBuffer()
		}
	}
};
