/*
 * Copyright 2017-2018 Amazon.com, Inc. or 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. A copy of the License is located at
 *
 *     http://aws.amazon.com/apache2.0/
 *
 * or in the "license" file accompanying this file. This file 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 * as Observable from 'zen-observable';
import { PubSubProvider, ProvidertOptions } from '../types';
import { ConsoleLogger as Logger } from '@aws-amplify/core';

const logger = new Logger('AbstractPubSubProvider');

export abstract class AbstractPubSubProvider implements PubSubProvider {

    private _config: ProvidertOptions;

    constructor(options: ProvidertOptions = {}) {
        this._config = options;
    }

    configure(config: ProvidertOptions = {}): ProvidertOptions {
        this._config = { ...config, ...this._config };

        logger.debug(`configure ${this.getProviderName()}`, this._config);

        return this.options;
    }

    getCategory() { return 'PubSub'; }

    abstract getProviderName(): string;

    protected get options(): ProvidertOptions { return { ...this._config }; }

    public abstract newClient(clientOptions: ProvidertOptions): Promise<any>;

    public abstract publish(topics: string[] | string, msg: any, options?: ProvidertOptions): void;

    public abstract subscribe(topics: string[] | string, options?: ProvidertOptions): Observable<any>;

}