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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/>.

/**
 * Provides the functionality for toggling the manual completion state of a course module through
 * the manual completion button.
 *
 * @module      core_course/manual_completion_toggle
 * @copyright   2021 Jun Pataleta <jun@moodle.com>
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

import Templates from 'core/templates';
import Notification from 'core/notification';
import {toggleManualCompletion} from 'core_course/repository';
import * as CourseEvents from 'core_course/events';
import Pending from 'core/pending';

/**
 * Selectors in the manual completion template.
 *
 * @type {{MANUAL_TOGGLE: string}}
 */
const SELECTORS = {
    MANUAL_TOGGLE: 'button[data-action=toggle-manual-completion]',
};

/**
 * Toggle type values for the data-toggletype attribute in the core_course/completion_manual template.
 *
 * @type {{TOGGLE_UNDO: string, TOGGLE_MARK_DONE: string}}
 */
const TOGGLE_TYPES = {
    TOGGLE_MARK_DONE: 'manual:mark-done',
    TOGGLE_UNDO: 'manual:undo',
};

/**
 * Whether the event listener has already been registered for this module.
 *
 * @type {boolean}
 */
let registered = false;

/**
 * Registers the click event listener for the manual completion toggle button.
 */
export const init = () => {
    if (registered) {
        return;
    }
    document.addEventListener('click', (e) => {
        const toggleButton = e.target.closest(SELECTORS.MANUAL_TOGGLE);
        if (toggleButton) {
            e.preventDefault();
            toggleManualCompletionState(toggleButton).catch(Notification.exception);
        }
    });
    registered = true;
};

/**
 * Toggles the manual completion state of the module for the given user.
 *
 * @param {HTMLElement} toggleButton
 * @returns {Promise<void>}
 */
const toggleManualCompletionState = async(toggleButton) => {
    const pendingPromise = new Pending('core_course:toggleManualCompletionState');
    // Make a copy of the original content of the button.
    const originalInnerHtml = toggleButton.innerHTML;

// Disable the button to prevent double clicks.
    toggleButton.setAttribute('disabled', 'disabled');

// Get button data.
    const toggleType = toggleButton.getAttribute('data-toggletype');
    const cmid = toggleButton.getAttribute('data-cmid');
    const activityname = toggleButton.getAttribute('data-activityname');
    // Get the target completion state.
    const completed = toggleType === TOGGLE_TYPES.TOGGLE_MARK_DONE;

// Replace the button contents with the loading icon.
    Templates.renderForPromise('core/loading', {})
    .then((loadingHtml) => {
        Templates.replaceNodeContents(toggleButton, loadingHtml, '');
        return;
    }).catch(() => {});

try {
        // Call the webservice to update the manual completion status.
        await toggleManualCompletion(cmid, completed);

// All good so far. Refresh the manual completion button to reflect its new state by re-rendering the template.
        const templateContext = {
            cmid: cmid,
            activityname: activityname,
            overallcomplete: completed,
            overallincomplete: !completed,
            istrackeduser: true, // We know that we're tracking completion for this user given the presence of this button.
        };
        const renderObject = await Templates.renderForPromise('core_course/completion_manual', templateContext);

// Replace the toggle button with the newly loaded template.
        const replacedNode = await Templates.replaceNode(toggleButton, renderObject.html, renderObject.js);
        const newToggleButton = replacedNode.pop();

// Build manualCompletionToggled custom event.
        const withAvailability = toggleButton.getAttribute('data-withavailability');
        const toggledEvent = new CustomEvent(CourseEvents.manualCompletionToggled, {
            bubbles: true,
            detail: {
                cmid,
                activityname,
                completed,
                withAvailability,
            }
        });
        // Dispatch the manualCompletionToggled custom event.
        newToggleButton.dispatchEvent(toggledEvent);

} catch (exception) {
        // In case of an error, revert the original state and appearance of the button.
        toggleButton.removeAttribute('disabled');
        toggleButton.innerHTML = originalInnerHtml;

// Show the exception.
        Notification.exception(exception);
    }
    pendingPromise.resolve();
};

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