/*!
 * @license
 * Copyright 2019 Alfresco Software, 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 { Observable, from, throwError } from 'rxjs';
import { CommentModel } from '../models/comment.model';
import { AlfrescoApiService } from '../services/alfresco-api.service';
import { LogService } from '../services/log.service';
import { map, catchError } from 'rxjs/operators';
import { CommentEntry, CommentsApi } from '@alfresco/js-api';

@Injectable({
    providedIn: 'root'
})
export class CommentContentService {

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

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

    /**
     * Adds a comment to a node.
     * @param nodeId ID of the target node
     * @param message Text for the comment
     * @returns Details of the comment added
     */
    addNodeComment(nodeId: string, message: string): Observable<CommentModel> {
        return from(this.commentsApi.createComment(nodeId, { content: message }))
            .pipe(
                map((response: CommentEntry) => {
                    return new CommentModel({
                        id: response.entry.id,
                        message: response.entry.content,
                        created: response.entry.createdAt,
                        createdBy: response.entry.createdBy
                    });
                }),
                catchError((err) => this.handleError(err))
            );
    }

    /**
     * Gets all comments that have been added to a node.
     * @param nodeId ID of the target node
     * @returns Details for each comment
     */
    getNodeComments(nodeId: string): Observable<CommentModel[]> {
        return from(this.commentsApi.listComments(nodeId))
            .pipe(
                map((response) => {
                    const comments: CommentModel[] = [];
                    response.list.entries.forEach((comment: any) => {
                        comments.push(new CommentModel({
                            id: comment.entry.id,
                            message: comment.entry.content,
                            created: comment.entry.createdAt,
                            createdBy: comment.entry.createdBy
                        }));
                    });
                    return comments;
                }),
                catchError((err) => this.handleError(err))
            );
    }

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

}