/*!
 * @license
 * Copyright © 2005-2023 Hyland Software, Inc. and its affiliates. All rights reserved.
 *
 * 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 { Observable, from, throwError } from 'rxjs';
import { CommentModel, AlfrescoApiService, LogService, CommentsService, User } from '@alfresco/adf-core';
import { map, catchError } from 'rxjs/operators';
import { ActivitiCommentsApi } from '@alfresco/js-api';
import { PeopleProcessService } from '../../common/services/people-process.service';
import { UserProcessModel } from '../../common/models/user-process.model';

@Injectable({
    providedIn: 'root'
})
export class CommentProcessService implements CommentsService {

    private _commentsApi: ActivitiCommentsApi;
    get commentsApi(): ActivitiCommentsApi {
        this._commentsApi = this._commentsApi ?? new ActivitiCommentsApi(this.apiService.getInstance());
        return this._commentsApi;
    }

    constructor(private apiService: AlfrescoApiService,
                private logService: LogService,
                private peopleProcessService: PeopleProcessService
                ) {
    }

    /**
     * Gets all comments that have been added to a process instance.
     *
     * @param id ID of the target process instance
     * @returns Details for each comment
     */
    get(id: string): Observable<CommentModel[]> {
        return from(this.commentsApi.getProcessInstanceComments(id))
            .pipe(
                map((response) => {
                    const comments: CommentModel[] = [];
                    response.data.forEach((comment) => {
                        const user = new UserProcessModel(comment.createdBy);
                        comments.push(new CommentModel({
                            id: comment.id,
                            message: comment.message,
                            created: comment.created,
                            createdBy: new User(user)
                        }));
                    });
                    return comments;
                }),
                catchError((err: any) => this.handleError(err))
            );
    }

    /**
     * Adds a comment to a process instance.
     *
     * @param id ID of the target process instance
     * @param message Text for the comment
     * @returns Details of the comment added
     */
    add(id: string, message: string): Observable<CommentModel> {
        return from(
            this.commentsApi.addProcessInstanceComment({ message }, id)
        ).pipe(
            map((response) => new CommentModel({
                id: response.id,
                message: response.message,
                created: response.created,
                createdBy: new User(response.createdBy)
            })),
            catchError((err: any) => this.handleError(err))
        );
    }

    private handleError(error: any) {
        this.logService.error(error);
        return throwError(error || 'Server error');
    }

    getUserImage(user: UserProcessModel): string {
        return this.peopleProcessService.getUserImage(user);
    }
}