/* Copyright IBM Corp. 2017 */
import { defer, Observable, of } from 'rxjs';

import { CMD_SHOW } from './../constants';
import { Options } from './../options';
import { VERSION } from './../utils/version';
import { AbstractCommand } from './abstract.command';
import { Command } from './command';

export class ShowVersionCommand extends AbstractCommand implements Command {

    static readonly TYPE = 'version';
    static readonly COMMAND = CMD_SHOW;

    constructor(private options: Options) {
        super(options);
    }

    printHelp(): void {
        // log the command line
        console.log(ShowVersionCommand.COMMAND, ShowVersionCommand.TYPE);
    }

    process(): Observable<string> {
        // defer
        return defer(() => {
            // get the version string
            const version = `version: ${VERSION.version}, build: ${VERSION.build}`;
            return of(version);
        });
    }
}