import {Directive} from '../Directive'
import {CommandLineApplication} from '../service'
import {Injectable} from '../../di'
import {ErrorWithContext} from '../../util'
import {Unit} from '../../lifecycle/Unit'

/**
 * A directive that starts the framework's final target normally.
 * In most cases, this runs the HTTP server, which would have been replaced
 * by the CommandLineApplication unit.
 */
@Injectable()
export class RunDirective extends Directive {
    getDescription(): string {
        return 'run the application normally'
    }

    getKeywords(): string | string[] {
        return ['run', 'up']
    }

    async handle(): Promise<void> {
        if ( !CommandLineApplication.getReplacement() ) {
            throw new ErrorWithContext(`Cannot run application: no run target specified.`)
        }

        const unit = <Unit> this.make(CommandLineApplication.getReplacement())
        await this.app().startUnit(unit)
        await this.app().stopUnit(unit)
    }
}