// (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 { CoreContentLinksModuleIndexHandler } from '@features/contentlinks/classes/module-index-handler';
import { CoreContentLinksAction } from '@features/contentlinks/services/contentlinks-delegate';
import { CoreCourse } from '@features/course/services/course';
import { CoreCourseHelper } from '@features/course/services/course-helper';
import { CoreSitesReadingStrategy } from '@services/sites';
import { CoreLoadings } from '@services/overlays/loadings';
import { CorePromiseUtils } from '@singletons/promise-utils';
import { makeSingleton } from '@singletons';
import { AddonModLesson } from '../lesson';

/**
 * Handler to treat links to lesson index.
 */
@Injectable({ providedIn: 'root' })
export class AddonModLessonIndexLinkHandlerService extends CoreContentLinksModuleIndexHandler {

    name = 'AddonModLessonIndexLinkHandler';

    constructor() {
        super('AddonModLesson', 'lesson');
    }

    /**
     * Get the list of actions for a link (url).
     *
     * @param siteIds List of sites the URL belongs to.
     * @param url The URL to treat.
     * @param params The params of the URL. E.g. 'mysite.com?id=1' -> {id: 1}
     * @param courseId Course ID related to the URL. Optional but recommended.
     * @returns List of (or promise resolved with list of) actions.
     */
    getActions(
        siteIds: string[],
        url: string,
        params: Record<string, string>,
        courseId?: number,
    ): CoreContentLinksAction[] | Promise<CoreContentLinksAction[]> {

        const cId = Number(courseId || params.courseid || params.cid);

        return [{
            action: async (siteId): Promise<void> => {
                /* Ignore the pageid param. If we open the lesson player with a certain page and the user hasn't started
                   the lesson, an error is thrown: could not find lesson_timer records. */
                if (params.userpassword) {
                    await this.navigateToModuleWithPassword(parseInt(params.id, 10), cId, params.userpassword, siteId);
                } else {
                    await CoreCourseHelper.navigateToModule(parseInt(params.id, 10), {
                        courseId,
                        siteId,
                    });
                }
            },
        }];
    }

    /**
     * Navigate to a lesson module (index page) with a fixed password.
     *
     * @param moduleId Module ID.
     * @param courseId Course ID.
     * @param password Password.
     * @param siteId Site ID.
     * @returns Promise resolved when navigated.
     */
    protected async navigateToModuleWithPassword(
        moduleId: number,
        courseId: number,
        password: string,
        siteId: string,
    ): Promise<void> {
        const modal = await CoreLoadings.show();

        try {
            // Get the module.
            const module = await CoreCourse.getModuleBasicInfo(
                moduleId,
                { siteId, readingStrategy: CoreSitesReadingStrategy.PREFER_CACHE },
            );

            // Store the password so it's automatically used.
            await CorePromiseUtils.ignoreErrors(AddonModLesson.storePassword(module.instance, password, siteId));

            await CoreCourseHelper.navigateToModule(moduleId, {
                courseId: module.course,
                sectionId: module.section,
                siteId,
            });
        } catch {
            // Error, go to index page.
            await CoreCourseHelper.navigateToModule(moduleId, {
                courseId,
                siteId,
            });
        } finally {
            modal.dismiss();
        }
    }

}

export const AddonModLessonIndexLinkHandler = makeSingleton(AddonModLessonIndexLinkHandlerService);