(function () {
    'use strict';
    var mod = angular.module('myMessages');
    var serviceId = 'fileReaderService';

    mod.factory(serviceId, ['common', '$q', myMessagesService]);

    function myMessagesService(common, $q) {
        var getLogFn = common.logger.getLogFn;
        var log = getLogFn(serviceId);
        var logSuccess = getLogFn(serviceId, 'success');
        var logError = getLogFn(serviceId, 'error');
        var logWarning = getLogFn(serviceId, 'warning');

        var service = {
            readAsDataURL: readAsDataURL

        };
        return service;

        function readAsDataURL (file, scope) {
            var deferred = $q.defer();
            var reader = getReader(deferred, scope);
            reader.readAsDataURL(file);
            return deferred.promise;
        };

        function getReader (deferred, scope) {
            var reader = new FileReader();
            reader.onload = onLoad(reader, deferred, scope);
            reader.onerror = onError(reader, deferred, scope);
            reader.onprogress = onProgress(reader, scope);
            return reader;
        };

        function onLoad (reader, deferred, scope) {
            return function () {
                scope.$apply(function () {
                    deferred.resolve(reader.result);
                });
            };
        };

        function onError (reader, deferred, scope) {
            return function () {
                scope.$apply(function () {
                    deferred.reject(reader.result);
                });
            };
        };

        function onProgress (reader, scope) {
            return function (event) {
                scope.$broadcast("fileProgress",
                    {
                        total: event.total,
                        loaded: event.loaded
                    });
            };
        };
    }
})();