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// This file is part of Moodle - http://moodle.org/
//
// Moodle 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, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Launches the modal dialogue that contains the iframe that sends the Content-Item selection request to an
 * LTI tool provider that supports Content-Item type message.
 *
 * See template: mod_lti/contentitem
 *
 * @module     mod_lti/contentitem
 * @copyright  2016 Jun Pataleta <jun@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @since      3.2
 */
define(
    [
        'jquery',
        'core/notification',
        'core/str',
        'core/templates',
        'mod_lti/form-field',
        'core/modal',
        'core/modal_events'
    ],
    function($, notification, str, templates, FormField, Modal, ModalEvents) {
        var dialogue;
        var doneCallback;
        var contentItem = {
            /**
             * Init function.
             *
             * @param {string} url The URL for the content item selection.
             * @param {object} postData The data to be sent for the content item selection request.
             * @param {Function} cb The callback to run once the content item has been processed.
             */
            init: function(url, postData, cb) {
                doneCallback = cb;
                var context = {
                    url: url,
                    postData: postData
                };
                var bodyPromise = templates.render('mod_lti/contentitem', context);

if (dialogue) {
                    // Set dialogue body.
                    dialogue.setBody(bodyPromise);
                    // Display the dialogue.
                    dialogue.show();
                    return;
                }

str.get_string('selectcontent', 'lti').then(function(title) {
                    return Modal.create({
                        title: title,
                        body: bodyPromise,
                        large: true,
                        show: true,
                    });
                }).then(function(modal) {
                    dialogue = modal;
                    // On hide handler.
                    modal.getRoot().on(ModalEvents.hidden, function() {
                        // Empty modal contents when it's hidden.
                        modal.setBody('');

// Fetch notifications.
                        notification.fetchNotifications();
                    });
                    return;
                }).catch(notification.exception);
            }
        };

/**
         * Array of form fields for LTI tool configuration.
         */
        var ltiFormFields = [
            new FormField('selectcontentstatus', FormField.TYPES.TEXT, true, ''),
            new FormField('name', FormField.TYPES.TEXT, false, ''),
            new FormField('introeditor', FormField.TYPES.EDITOR, false, ''),
            new FormField('toolurl', FormField.TYPES.TEXT, true, ''),
            new FormField('securetoolurl', FormField.TYPES.TEXT, true, ''),
            new FormField('instructorchoiceacceptgrades', FormField.TYPES.CHECKBOX, true, true),
            new FormField('instructorchoicesendname', FormField.TYPES.CHECKBOX, true, true),
            new FormField('instructorchoicesendemailaddr', FormField.TYPES.CHECKBOX, true, true),
            new FormField('instructorcustomparameters', FormField.TYPES.TEXT, true, ''),
            new FormField('icon', FormField.TYPES.TEXT, true, ''),
            new FormField('secureicon', FormField.TYPES.TEXT, true, ''),
            new FormField('launchcontainer', FormField.TYPES.SELECT, true, 0),
            new FormField('grade_modgrade_point', FormField.TYPES.TEXT, false, ''),
            new FormField('lineitemresourceid', FormField.TYPES.TEXT, true, ''),
            new FormField('lineitemtag', FormField.TYPES.TEXT, true, ''),
            new FormField('lineitemsubreviewurl', FormField.TYPES.TEXT, true, ''),
            new FormField('lineitemsubreviewparams', FormField.TYPES.TEXT, true, '')
        ];

/**
         * Hide the element, including aria and tab index.
         * @param {HTMLElement} e the element to be hidden.
         */
        const hideElement = (e) => {
            e.setAttribute('hidden', 'true');
            e.setAttribute('aria-hidden', 'true');
            e.setAttribute('tab-index', '-1');
        };

/**
         * Show the element, including aria and tab index (set to 1).
         * @param {HTMLElement} e the element to be shown.
         */
        const showElement = (e) => {
            e.removeAttribute('hidden');
            e.setAttribute('aria-hidden', 'false');
            e.setAttribute('tab-index', '1');
        };

/**
         * When more than one item needs to be added, the UI is simplified
         * to just list the items to be added. Form is hidden and the only
         * options is (save and return to course) or cancel.
         * This function injects the summary to the form page, and hides
         * the unneeded elements.
         * @param {Object[]} items items to be added to the course.
         */
        const showMultipleSummaryAndHideForm = async function(items) {
            const form = document.querySelector('#region-main-box form');
            const toolArea = form.querySelector('[data-attribute="dynamic-import"]');
            const buttonGroup = form.querySelector('#fgroup_id_buttonar');
            const submitAndLaunch = form.querySelector('#id_submitbutton');
            Array.from(form.children).forEach(hideElement);
            hideElement(submitAndLaunch);
            const {html, js} = await templates.renderForPromise('mod_lti/tool_deeplinking_results',
                {items: items});

await templates.replaceNodeContents(toolArea, html, js);
            showElement(toolArea);
            showElement(buttonGroup);
        };

/**
         * Transforms config values aimed at populating the lti mod form to JSON variant
         * which are used to insert more than one activity modules in one submit
         * by applying variation to the submitted form.
         * See /course/modedit.php.
         * @private
         * @param {Object} config transforms a config to an actual form data to be posted.
         * @return {Object} variant that will be used to modify form values on submit.
         */
        var configToVariant = (config) => {
            const variant = {};
            ['name', 'toolurl', 'securetoolurl', 'instructorcustomparameters', 'icon', 'secureicon',
                'launchcontainer', 'lineitemresourceid', 'lineitemtag', 'lineitemsubreviewurl',
                'lineitemsubreviewparams', 'selectcontentstatus'].forEach(
                function(name) {
                    variant[name] = config[name] || '';
                }
            );
            variant['introeditor[text]'] = config.introeditor ? config.introeditor.text : '';
            variant['introeditor[format]'] = config.introeditor ? config.introeditor.format : '';
            if (config.instructorchoiceacceptgrades === 1) {
                variant.instructorchoiceacceptgrades = '1';
                variant['grade[modgrade_point]'] = config.grade_modgrade_point || '100';
            } else {
                variant.instructorchoiceacceptgrades = '0';
            }
            return variant;
        };

/**
         * Window function that can be called from mod_lti/contentitem_return to close the dialogue and process the return data.
         * If the return data contains more than one item, the form will not be populated with item data
         * but rather hidden, and the item data will be added to a single input field used to create multiple
         * instances in one request.
         *
         * @param {object} returnData The fetched configuration data from the Content-Item selection dialogue.
         */
        window.processContentItemReturnData = function(returnData) {
            if (dialogue) {
                dialogue.hide();
            }
            var index;
            if (returnData.multiple) {
                for (index in ltiFormFields) {
                    // Name is required, so putting a placeholder as it will not be used
                    // in multi-items add.
                    ltiFormFields[index].setFieldValue(ltiFormFields[index].name === 'name' ? 'item' : null);
                }
                var variants = [];
                returnData.multiple.forEach(function(v) {
                    variants.push(configToVariant(v));
                });
                showMultipleSummaryAndHideForm(returnData.multiple);
                const submitAndCourse = document.querySelector('#id_submitbutton2');
                submitAndCourse.onclick = (e) => {
                    e.preventDefault();
                    submitAndCourse.disabled = true;
                    const fd = new FormData(document.querySelector('#region-main-box form'));
                    const postVariant = (promise, variant) => {
                        Object.entries(variant).forEach((entry) => fd.set(entry[0], entry[1]));
                        const body = new URLSearchParams(fd);
                        const doPost = () => fetch(document.location.pathname, {method: 'post', body});
                        return promise.then(doPost).catch(doPost);
                    };
                    const backToCourse = () => {
                        document.querySelector("#id_cancel").click();
                    };
                    variants.reduce(postVariant, Promise.resolve()).then(backToCourse).catch(backToCourse);
                };
            } else {
                // Populate LTI configuration fields from return data.
                for (index in ltiFormFields) {
                    var field = ltiFormFields[index];
                    var value = null;
                    if (typeof returnData[field.name] !== 'undefined') {
                        value = returnData[field.name];
                    }
                    field.setFieldValue(value);
                }
                field.setFieldValue(value);

// Update the UI element which signifies content has been selected.
                document.querySelector("#id_selectcontentindicator").innerHTML = returnData.selectcontentindicator;
            }

if (doneCallback) {
                doneCallback(returnData);
            }
        };

return contentItem;
    }
);

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