/*!
 * @license
 * Copyright 2016 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 { AlfrescoApiService, LogService } from '@alfresco/adf-core';
import { EventEmitter, Injectable, Output } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/throw';

@Injectable()
export class TagService {

    @Output()
    refresh = new EventEmitter();

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

    /**
     * Gets a list of tags added to a node.
     * @param nodeId ID of the target node
     */
    getTagsByNodeId(nodeId: string): any {
        return Observable.fromPromise(this.apiService.getInstance().core.tagsApi.getNodeTags(nodeId))
            .catch(err => this.handleError(err));
    }

    /** Gets a list of all the tags already defined in the repository. */
    getAllTheTags() {
        return Observable.fromPromise(this.apiService.getInstance().core.tagsApi.getTags())
            .catch(err => this.handleError(err));
    }

    /**
     * Adds a tag to a node.
     * @param nodeId ID of the target node
     * @param tagName Name of the tag to add
     */
    addTag(nodeId: string, tagName: string): any {
        let alfrescoApi: any = this.apiService.getInstance();
        let tagBody = new alfrescoApi.core.TagBody();
        tagBody.tag = tagName;

        let promiseAdd = Observable.fromPromise(this.apiService.getInstance().core.tagsApi.addTag(nodeId, tagBody));

        promiseAdd.subscribe((data) => {
            this.refresh.emit(data);
        }, (err) => {
            this.handleError(err);
        });

        return promiseAdd;
    }

    /**
     * Removes a tag from a node.
     * @param nodeId ID of the target node
     * @param tag Name of the tag to remove
     */
    removeTag(nodeId: string, tag: string): any {
        let promiseRemove = Observable.fromPromise(this.apiService.getInstance().core.tagsApi.removeTag(nodeId, tag));

        promiseRemove.subscribe((data) => {
            this.refresh.emit(data);
        }, (err) => {
            this.handleError(err);
        });

        return promiseRemove;
    }

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