block-handler.ts

// (C) Copyright 2015 Moodle Pty Ltd.
//
// 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.

import { Injectable } from '@angular/core';
import { CoreBlockHandlerData } from '@features/block/services/block-delegate';
import { CoreBlockBaseHandler } from '@features/block/classes/base-block-handler';
import { makeSingleton } from '@singletons';
import { CoreCourses } from '@features/courses/services/courses';
import { CoreSites } from '@services/sites';

/**
 * Block handler.
 */
@Injectable({ providedIn: 'root' })
export class AddonBlockCourseListHandlerService extends CoreBlockBaseHandler {

    name = 'AddonBlockCourseList';
    blockName = 'course_list';

    /**
     * @inheritdoc
     */
    async getDisplayData(): Promise<CoreBlockHandlerData> {
        const { CoreBlockOnlyTitleComponent } = await import('@features/block/components/only-title-block/only-title-block');

        let showCategories = CoreSites.getRequiredCurrentSite().isAdmin();
        if (!showCategories) {
            const courses =  await CoreCourses.getUserCourses();

            showCategories = courses.length === 0;
        }

        if (showCategories) { // Admins and users without courses, show categories.
            return {
                title: 'core.courses.categories',
                class: 'addon-block-course-list',
                component: CoreBlockOnlyTitleComponent,
                link: 'courses/categories',
            };
        }

        return {
            title: 'core.courses.mycourses',
            class: 'addon-block-course-list',
            component: CoreBlockOnlyTitleComponent,
            link: 'courses/list',
            linkParams: { mode: 'my' },
        };
    }

}

export const AddonBlockCourseListHandler = makeSingleton(AddonBlockCourseListHandlerService);