'use strict';

/**
 * @ngdoc service
 * @name passmanApp.FileService
 * @description
 * # FileService
 * Service in the passmanApp.
 */
angular.module('passmanApp')
	.service('FileService', ['$http', 'EncryptService', function ($http, EncryptService) {
		return {
			uploadFile: function (file, key) {
				var queryUrl = OC.generateUrl('apps/passman/api/v2/file');
				var _file = angular.copy(file);
				_file.filename = EncryptService.encryptString(_file.filename, key);
				var data = EncryptService.encryptString(angular.copy(file.data), key);
				_file.data = data;
				return $http.post(queryUrl, _file).then(function (response) {
					if (response.data) {
						return response.data;
					} else {
						return response;
					}
				});
			},
			deleteFile: function (file) {
				var queryUrl = OC.generateUrl('apps/passman/api/v2/file/' + file.file_id);
				var _file = angular.copy(file);
				return $http.delete(queryUrl, _file).then(function (response) {
					if (response.data) {
						return response.data;
					} else {
						return response;
					}
				});
			},
			getFile: function (file) {
				var queryUrl = OC.generateUrl('apps/passman/api/v2/file/' + file.file_id);
				var _file = angular.copy(file);
				return $http.get(queryUrl, _file).then(function (response) {
					if (response.data) {
						if (Object.prototype.toString.call(response.data) === '[object Array]') {
							return response.data.pop()
						} else {
							return response.data;
						}
					} else {
						return response;
					}
				});
			},
			/**
			 * Update a file and it's contents
			 * @param file
			 * @param key Optional encryption key to use
			 * @returns {*}
			 */
			updateFile: function(file, key){
				var queryUrl = OC.generateUrl('apps/passman/api/v2/file/'+ file.file_id);
				var _file = angular.copy(file);
				_file.filename = EncryptService.encryptString(_file.filename, key);
				var data = EncryptService.encryptString(angular.copy(file.file_data), key);
				_file.file_data = data;
				return $http.patch(queryUrl, _file).then(function (response) {
					if (response.data) {
						return response.data;
					} else {
						return response;
					}
				});
			},
			dataURItoBlob: function (dataURI, ftype) {
				var byteString, mimeString, ab, ia, bb, i;
				// convert base64 to raw binary data held in a string
				// doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
				byteString = atob(dataURI.split(',')[1]);

				// separate out the mime component
				mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];

				// write the bytes of the string to an ArrayBuffer
				ab = new ArrayBuffer(byteString.length);
				ia = new Uint8Array(ab);
				for (i = 0; i < byteString.length; i++) {
					ia[i] = byteString.charCodeAt(i);
				}

				// write the ArrayBuffer to a blob, and you're done
				bb = new Blob([ab], {
					type: ftype
				});

				return URL.createObjectURL(bb);
			}
	}
	}]);