import {HTTPKernelModule} from '../HTTPKernelModule'
import {Inject, Injectable} from '../../../di'
import {HTTPKernel} from '../HTTPKernel'
import {Request} from '../../lifecycle/Request'
import {EventBus} from '../../../event/EventBus'
import {PropagatingEventBus} from '../../../event/PropagatingEventBus'

/**
 * HTTP kernel module that creates a request-specific event bus
 * and injects it into the request container.
 */
@Injectable()
export class InjectRequestEventBusHTTPModule extends HTTPKernelModule {
    @Inject()
    protected bus!: EventBus

    public static register(kernel: HTTPKernel): void {
        kernel.register(this).first()
    }

    public async apply(request: Request): Promise<Request> {
        const bus = <PropagatingEventBus> this.make(PropagatingEventBus)
        bus.connect(this.bus)

        request.purge(EventBus).registerProducer(EventBus, () => bus)
        return request
    }
}