/**
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; under version 2
 * of the License (non-upgradable).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2016-2019 (original work) Open Assessment Technologies SA ;
 */
/**
 * @author Jean-Sébastien Conan <jean-sebastien.conan@vesperiagroup.com>
 */
define([
    'jquery',
    'lodash',
    'core/store',
    'taoTests/runner/testStore',
    'taoTests/runner/proxy',
    'taoQtiTest/test/runner/mocks/areaBrokerMock'
], function($, _, store, testStoreFactory, proxyFactory, areaBroker) {
    'use strict';

    var defaultName = 'mock';

    /**
     * Build a runner mock
     * @param {Object} [config]
     * @param {String} [config.name]
     * @param {Object} [config.areaBroker]
     * @param {Array} [config.areas]
     * @param {Object} [config.proxy]
     * @param {String} [config.proxyName]
     * @returns {*}
     */
    function provider(config) {
        var providerApi;

        config = config || {};

        providerApi = {
            //provider name
            name: config.name || defaultName,

            /**
             * Initialize and load the area broker with a correct mapping
             * @returns {areaBroker}
             */
            loadAreaBroker: function loadAreaBroker() {
                return config.areaBroker || areaBroker({ areas: config.areas });
            },

            /**
             * Initialize and load the test runner proxy
             * @returns {proxy}
             */
            loadProxy: function loadProxy() {
                return config.proxy || proxyFactory(config.proxyName || defaultName, config);
            },

            /**
             * Initialize and load the test store
             * @returns {testStore}
             */
            loadTestStore: function loadTestStore() {
                const localConfig = this.getConfig();

                //the test run needs to be identified uniquely
                var identifier = localConfig.serviceCallId || `test-${Date.now()}`;
                return testStoreFactory(identifier, store.backends.memory);
            },

            /**
             * Initialization of the provider, called during test runner init phase.
             *
             * We install behaviors during this phase (ie. even handlers)
             * and we call proxy.init.
             *
             * @this {runner} the runner context, not the provider
             * @returns {Promise} to chain proxy.init
             */
            init: function init() {
                var self = this;
                var providerConfig = this.getConfig();

                //install event based behavior
                this.on('ready', function() {
                    this.loadItem('item-0');
                }).on('move', function(type) {
                    var test = this.getTestContext();

                    if (type === 'next') {
                        if (test.items[test.current + 1]) {
                            self.unloadItem(`item-${test.current}`);
                            self.loadItem(`item-${test.current + 1}`);
                        } else {
                            self.finish();
                        }
                    } else if (type === 'previous') {
                        if (test.items[test.current - 1]) {
                            self.unloadItem(`item-${test.current}`);
                            self.loadItem(`item-${test.current - 1}`);
                        } else {
                            self.loadItem('item-0');
                        }
                    }
                });

                //load test data
                return new Promise(function(resolve) {
                    $.getJSON(providerConfig.url).success(function(test) {
                        self.setTestContext(
                            _.defaults(test || {}, {
                                items: {},
                                current: 0
                            })
                        );

                        resolve();
                    });
                });
            },

            /**
             * Rendering phase of the test runner
             *
             * Attach the test runner to the DOM
             *
             * @this {runner} the runner context, not the provider
             */
            render: function() {
                var providerConfig = this.getConfig();
                var context = this.getTestContext();
                var broker = this.getAreaBroker();
                var $renderTo;

                broker
                    .getContainer()
                    .find('.title')
                    .html(`Running Test ${context.id}`);

                $renderTo = providerConfig.renderTo || $('body');

                $renderTo.append(broker.getContainer());
            },

            /**
             * LoadItem phase of the test runner
             *
             * We call the proxy in order to get the item data
             *
             * @this {runner} the runner context, not the provider
             * @param {number} itemIndex
             * @returns {Promise} that calls in parallel the state and the item data
             */
            loadItem: function loadItem(itemIndex) {
                var self = this;

                var test = this.getTestContext();
                var broker = this.getAreaBroker();
                var $content = broker.getContentArea();

                $content.html('loading');

                return new Promise(function(resolve) {
                    setTimeout(function() {
                        test.current = parseInt(itemIndex.replace('item-', ''), 10);
                        self.setTestContext(test);

                        resolve(test.items[test.current]);
                    }, 500);
                });
            },

            /**
             * RenderItem phase of the test runner
             *
             * Here we iniitialize the item runner and wrap it's call to the test runner
             *
             * @this {runner} the runner context, not the provider
             * @param {number} itemIndex
             * @param {object} item
             */
            renderItem: function renderItem(itemIndex, item) {
                var broker = this.getAreaBroker();
                var $content = broker.getContentArea();
                $content.html(`<h1>${item.id}</h1>` + `<div>${item.content}</div>`);
            },

            /**
             * Finish phase of the test runner
             *
             * Calls proxy.finish to close the testj
             *
             * @this {runner} the runner context, not the provider
             */
            finish: function() {
                var broker = this.getAreaBroker();
                var $content = broker.getContentArea();
                $content.html('<h1>Done</h1>');
            }
        };

        return providerApi;
    }

    return provider;
});