example.js

(function() {
  'use strict';

  angular
    .module('core')
    .controller('ModalController', ModalController);

  ModalController.$inject = ['$modalInstance', 'model', 'attrs'];

  function ModalController($modalInstance, model, attrs) {
    var vm = this;

    vm.cancel = cancel;
    vm.done = done;
    vm.model = model;

    function cancel() {
      $modalInstance.dismiss('cancel');
    }

    function done() {
      $modalInstance.save(vm.model);
    }
  }

  angular
    .module('core')
    .controller('Controller', Controller);

  Controller.$inject = ['$scope', 'model'];

  function Controller($scope, model) {
    var vm = this;

    vm.model = model;
    vm.openModal = openModal;

    var modalOptions = {
      templateUrl: 'modules/core/views/modal.html',
      controller: 'ModalController',
      controllerAs: 'vm'
    };

    function openModal(model) {
      modalFactory
        .open(model, modalOptions, {
          foo: 'bar'
        })
        .result
        .then(successCallback);
    }

    function successCallback(res) {
      console.log('success', res);
    }
  }
})();

modalFactory.js

(function () {
    'use strict';

    angular
        .module('core')
        .factory('modalFactory', ModalFactory);

    ModalFactory.$inject = ['$modal'];

    function ModalFactory($modal) {
        return {
            open: open
        }

        function open(model, options, attrs) {
            var defaults = {
                backdrop: 'static',
                resolve: {
                    model: function () {
                        return angular.copy(model);
                    },
                    attrs: function () {
                        return attrs;
                    }
                }
            };

            var promise = $modal.open(angular.extend({}, defaults, options))

            promise.save = function (result) {
                angular.copy(result, model);

                return promise.close(model);
            }

            return promise;
        }
    }
})();