import {Event} from '../event/Event'
import {Awaitable, JSONState, UniversalPath} from '../util'
import {ExtolloAwareNodeModule} from './types'

/**
 * An event indicating that an NPM package has been discovered
 * by the framework.
 *
 * Application services can listen for this event to register
 * various discovery logic (e.g. automatically boot units
 */
export class PackageDiscovered extends Event {
    constructor(
        public packageConfig: ExtolloAwareNodeModule,
        public packageJson: UniversalPath,
    ) {
        super()
    }

    dehydrate(): Awaitable<JSONState> {
        return {
            packageConfig: this.packageConfig as JSONState,
            packageJson: this.packageJson.toString(),
        }
    }

    rehydrate(state: JSONState): Awaitable<void> {
        if ( typeof state === 'object' ) {
            this.packageConfig = (state.packageConfig as ExtolloAwareNodeModule)
            this.packageJson = new UniversalPath(String(state.packageJson))
        }
    }
}