Fis-MessageTransmission/src/transmission/msg.transmission.request-response.ts

/* This is more unique transmission component, because it's supposed to emulate a conventional request response call. But the underlying
mechanism is still using message. Here as you will see, it is basically taking the already instantiated transmitter and receiver components
and basically just filtering the responses based on whatever identifier it needs for the orignal request. */
import { MessageTransmissionBase } from "../base/msg.transmission.base";
import { filter, Observable, Observer, Subscription, Unsubscribable } from "rxjs";
import { FisMessage, MessageReceiverInterface, MessageRequestResponseInterface, MessageTransmitterInterface, TransmissionConfig, TransmissionProfile } from "../interface/interface";
import ConsoleLogger from "../utils/log.utils";
import { checkRxType } from "../utils/general.utils";

export class MessageTransmissionRequestResponse<T> implements MessageRequestResponseInterface<T> {
    private console: ConsoleLogger = new ConsoleLogger(`MessageTransmissionRequestResponse`, ['transmission'])
    private transmissionProfile!: TransmissionProfile
    protected transmitterInstance!: MessageTransmitterInterface<any>;
    protected receiverInstance!: MessageReceiverInterface<any>;

    constructor(config: TransmissionConfig, transmitterInstance: MessageTransmitterInterface<any>, receiverInstance: MessageReceiverInterface<any>) {
        this.console.log({ message: `Constructing Request Response Transmission for Receiving target: ${config.target}` })
        this.transmitterInstance = transmitterInstance
        this.receiverInstance = receiverInstance
    }

    getTransmissionProfile(type?: `config` | `id` | `role`): TransmissionProfile | TransmissionConfig | string | undefined {
        return type ? this.transmissionProfile[type] : this.transmissionProfile;
    }

    // this is still broken at this point in time. DO NOT USE!!!!
    subscribe(observer: Observer<T> | Observable<T>): Unsubscribable | null {
        if (checkRxType(observer) === `Observable`) {
            // Create a new Subscription to manage unsubscription
            const subscription = (observer as Observable<any>).subscribe(message => {
                this.send(message).subscribe(response => {
                    this.console.log({ message: `Response received: ${response}` });
                });
            });

            return subscription; // Return the Subscription (Unsubscribable)
        } else {
            return null;
        }
    }

    send(message: FisMessage): Observable<FisMessage> {
        return new Observable((response: Observer<FisMessage>) => {
            // logic here
            if (this.transmitterInstance && this.receiverInstance) {
                this.transmitterInstance.emit(message)
                const subscription: Subscription = this.receiverInstance.getReceivables().pipe(
                    filter(event => event.header.messageID === message.header.messageID),
                ).subscribe({
                    next: (message: FisMessage) => {
                        if (message.data == 'Complete') {
                            response.complete()
                        } else {
                            response.next(message)
                        }
                    },
                    error: error => console.error(error)
                })
                // Clean up on unsubscription
                return () => {
                    subscription.unsubscribe();
                }
            } else {
                response.error(new Error('Transmitter or receiver instance is missing.'));
                return;
            }
        });
    }


}