import { IpcMain } from 'electron';
import { Event } from '../Events';
import { EventBusInterface } from "./EventBusInterface";

export class IpcMainEventBus implements EventBusInterface {
    private ipc: IpcMain;
    private client: any;
    constructor(ipc: IpcMain) {
        this.ipc = ipc;
    }

    public subscribe<MessageType>(subscribeEvent: Event<MessageType>, callback: (msg: MessageType) => void) {
        console.log('subscribing', subscribeEvent.topic);
        this.ipc.on(subscribeEvent.topic, (event: any, arg: any) => {
            this.client = event.sender;
            callback(arg);
        });
    }

    public unsubscribeAll<MessageType>(event: Event<MessageType>) {
        console.log('unsubscribeAll', event.topic);
        this.ipc.removeAllListeners(event.topic);
    }

    public unsubscribe<MessageType>(event: Event<MessageType>, callback: any) {
        throw new Error('Not implemented'); // Todo: implement
    }

    public emit<MessageType>(event: Event<MessageType>, msg: MessageType) {
        if (!this.client.isDestroyed()) {
            this.client.send(event.topic, msg);
        }
    }
}