/**
 * The MIT License (MIT)

 Copyright (c) 2014 Dave Kerr

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.

 See: https://github.com/dwmkerr/angular-modal-service
 */
(function () {
    'use strict';

    var module = angular.module('angularModalService', []);

    module.factory('ModalService',
        ['$animate', '$document', '$compile', '$controller', '$http', '$rootScope', '$q', '$templateRequest',
            '$timeout',
            function ($animate, $document, $compile, $controller, $http, $rootScope, $q, $templateRequest, $timeout) {

                function ModalService() {

                    var self = this;

                    //  Returns a promise which gets the template, either
                    //  from the template parameter or via a request to the
                    //  template url parameter.
                    var getTemplate = function (template, templateUrl) {
                        var deferred = $q.defer();
                        if (template) {
                            deferred.resolve(template);
                        } else if (templateUrl) {
                            $templateRequest(templateUrl, true)
                                .then(function (template) {
                                    deferred.resolve(template);
                                }, function (error) {
                                    deferred.reject(error);
                                });
                        } else {
                            deferred.reject("No template or templateUrl has been specified.");
                        }
                        return deferred.promise;
                    };

                    //  Adds an element to the DOM as the last child of its container
                    //  like append, but uses $animate to handle animations. Returns a
                    //  promise that is resolved once all animation is complete.
                    var appendChild = function (parent, child) {
                        angular.element("body").css("overflow", "hidden");

                        var children = parent.children();
                        if (children.length > 0) {
                            return $animate.enter(child, parent, children[children.length - 1]);
                        }
                        return $animate.enter(child, parent);
                    };

                    self.showModal = function (options) {

                        //  Get the body of the document, we'll add the modal to this.
                        var body = angular.element($document[0].body);

                        //  Create a deferred we'll resolve when the modal is ready.
                        var deferred = $q.defer();

                        //  Validate the input parameters.
                        var controllerName = options.controller;
                        if (!controllerName) {
                            deferred.reject("No controller has been specified.");
                            return deferred.promise;
                        }

                        //  Get the actual html of the template.
                        getTemplate(options.template, options.templateUrl)
                            .then(function (template) {

                                //  Create a new scope for the modal.
                                var modalScope = (options.scope || $rootScope).$new();
                                var rootScopeOnClose = $rootScope.$on('$locationChangeSuccess', cleanUpClose);

                                //  Create the inputs object to the controller - this will include
                                //  the scope, as well as all inputs provided.
                                //  We will also create a deferred that is resolved with a provided
                                //  close function. The controller can then call 'close(result)'.
                                //  The controller can also provide a delay for closing - this is
                                //  helpful if there are closing animations which must finish first.
                                var closeDeferred = $q.defer();
                                var closedDeferred = $q.defer();
                                var inputs = {
                                    $scope: modalScope,
                                    close: function (result, delay) {
                                        if (delay === undefined || delay === null) {
                                            delay = 0;
                                        }
                                        $timeout(function () {

                                            cleanUpClose(result);

                                        }, delay);
                                    }
                                };

                                //  If we have provided any inputs, pass them to the controller.
                                if (options.inputs) {
                                    angular.extend(inputs, options.inputs);
                                }

                                //  Compile then link the template element, building the actual element.
                                //  Set the $element on the inputs so that it can be injected if required.
                                var linkFn = $compile(template);
                                var modalElement = linkFn(modalScope);
                                inputs.$element = modalElement;

                                //  Create the controller, explicitly specifying the scope to use.
                                var controllerObjBefore = modalScope[options.controllerAs];
                                var modalController = $controller(options.controller, inputs, false,
                                    options.controllerAs);

                                if (options.controllerAs && controllerObjBefore) {
                                    angular.extend(modalController, controllerObjBefore);
                                }

                                //  Finally, append the modal to the dom.
                                if (options.appendElement) {
                                    // append to custom append element
                                    appendChild(options.appendElement, modalElement);
                                } else {
                                    // append to body when no custom append element is specified
                                    appendChild(body, modalElement);
                                }

                                //  We now have a modal object...
                                var modal = {
                                    controller: modalController,
                                    scope: modalScope,
                                    element: modalElement,
                                    close: closeDeferred.promise,
                                    closed: closedDeferred.promise
                                };

                                //  ...which is passed to the caller via the promise.
                                deferred.resolve(modal);

                                function cleanUpClose(result) {

                                    angular.element("body").css("overflow", "");

                                    //  Resolve the 'close' promise.
                                    closeDeferred.resolve(result);

                                    //  Let angular remove the element and wait for animations to finish.
                                    $animate.leave(modalElement)
                                        .then(function () {
                                            //  Resolve the 'closed' promise.
                                            closedDeferred.resolve(result);

                                            //  We can now clean up the scope
                                            modalScope.$destroy();

                                            //  Unless we null out all of these objects we seem to suffer
                                            //  from memory leaks, if anyone can explain why then I'd
                                            //  be very interested to know.
                                            inputs.close = null;
                                            deferred = null;
                                            closeDeferred = null;
                                            modal = null;
                                            inputs = null;
                                            modalElement = null;
                                            modalScope = null;
                                        });

                                    // remove event watcher
                                    rootScopeOnClose && rootScopeOnClose();
                                }

                            })
                            .then(null, function (error) { // 'catch' doesn't work in IE8.
                                deferred.reject(error);
                            });

                        return deferred.promise;
                    };

                }

                return new ModalService();
            }]);
})();