/*****************************************************************************
 * Open MCT Web, Copyright (c) 2014-2015, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT Web is licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * Open MCT Web includes source code licensed under additional open source
 * licenses. See the Open Source Licenses file (LICENSES.md) included with
 * this source code distribution or the Licensing information page available
 * at runtime from the About dialog for additional information.
 *****************************************************************************/


define([
    '../creation/CreateWizard',
    './SaveInProgressDialog'
],
    function (
        CreateWizard,
        SaveInProgressDialog
    ) {

        /**
         * The "Save" action; the action triggered by clicking Save from
         * Edit Mode. Exits the editing user interface and invokes object
         * capabilities to persist the changes that have been made.
         * @constructor
         * @implements {Action}
         * @memberof platform/commonUI/edit
         */
        function SaveAsAction(
            $injector,
            policyService,
            dialogService,
            creationService,
            copyService,
            transactionService,
            context
        ) {
            this.domainObject = (context || {}).domainObject;
            this.injectObjectService = function () {
                this.objectService = $injector.get("objectService");
            };
            this.policyService = policyService;
            this.dialogService = dialogService;
            this.creationService = creationService;
            this.copyService = copyService;
            this.transactionService = transactionService;
        }

        /**
         * @private
         */
        SaveAsAction.prototype.createWizard = function (parent) {
            return new CreateWizard(
                this.domainObject,
                parent,
                this.policyService
            );
        };

        /**
         * @private
         */
        SaveAsAction.prototype.getObjectService = function () {
            // Lazily acquire object service (avoids cyclical dependency)
            if (!this.objectService) {
                this.injectObjectService();
            }
            return this.objectService;
        };

        function resolveWith(object) {
            return function () {
                return object;
            };
        }

        /**
         * Save changes and conclude editing.
         *
         * @returns {Promise} a promise that will be fulfilled when
         *          cancellation has completed
         * @memberof platform/commonUI/edit.SaveAction#
         */
        SaveAsAction.prototype.perform = function () {
            // Discard the current root view (which will be the editing
            // UI, which will have been pushed atop the Browse UI.)
            function returnToBrowse(object) {
                if (object) {
                    object.getCapability("action").perform("navigate");
                }
                return object;
            }

            return this.save().then(returnToBrowse);
        };

        /**
         * @private
         */
        SaveAsAction.prototype.save = function () {
            var self = this,
                domainObject = this.domainObject,
                copyService = this.copyService,
                transactionService = this.transactionService,
                cancelOldTransaction,
                dialog = new SaveInProgressDialog(this.dialogService);

            function doWizardSave(parent) {
                var wizard = self.createWizard(parent);

                return self.dialogService
                    .getUserInput(wizard.getFormStructure(true),
                        wizard.getInitialFormValue()
                    ).then(wizard.populateObjectFromInput.bind(wizard));
            }

            function showBlockingDialog(object) {
                dialog.show();
                return object;
            }

            function hideBlockingDialog(object) {
                dialog.hide();
                return object;
            }

            function fetchObject(objectId) {
                return self.getObjectService().getObjects([objectId]).then(function (objects) {
                    return objects[objectId];
                });
            }

            function getParent(object) {
                return fetchObject(object.getModel().location);
            }

            function allowClone(objectToClone) {
                return (objectToClone.getId() === domainObject.getId()) ||
                    objectToClone.getCapability('location').isOriginal();
            }

            function cloneIntoParent(parent) {
                return copyService.perform(domainObject, parent, allowClone);
            }

            function commitEditingAfterClone(clonedObject) {
                return domainObject.getCapability("editor").save()
                    .then(resolveWith(clonedObject));
            }

            function restartTransaction(object) {
                cancelOldTransaction = transactionService.restartTransaction();
                return object;
            }

            function doCancelOldTransaction(object) {
                cancelOldTransaction();
                return object;
            }

            function onFailure() {
                hideBlockingDialog();
                return false;
            }

            return getParent(domainObject)
                .then(doWizardSave)
                .then(showBlockingDialog)
                .then(getParent)
                .then(restartTransaction)
                .then(cloneIntoParent)
                .then(commitEditingAfterClone)
                .then(doCancelOldTransaction)
                .then(hideBlockingDialog)
                .catch(onFailure);
        };


        /**
         * Check if this action is applicable in a given context.
         * This will ensure that a domain object is present in the context,
         * and that this domain object is in Edit mode.
         * @returns true if applicable
         */
        SaveAsAction.appliesTo = function (context) {
            var domainObject = (context || {}).domainObject;
            return domainObject !== undefined &&
                domainObject.hasCapability('editor') &&
                domainObject.getCapability('editor').isEditContextRoot() &&
                domainObject.getModel().persisted === undefined;
        };

        return SaveAsAction;
    }
);