export class EventBroadcaster {
    private listeners: Map<string, Set<Function>> = new Map()

    /**
     * Assigns a listener for the specified event
     * @param event event name
     * @param listener function to call when the event is emitted
     */
    on(event: string, listener: Function) {
        if (!this.listeners.has(event))
            this.listeners.set(event, new Set())
        this.listeners.get(event)!.add(listener)
    }

    /**
     * Removes a listener from the specified event
     * @param event event name
     * @param listener function to remove
     */
    off(event: string, listener: Function) {
        if (this.listeners.has(event))
            this.listeners.get(event)!.delete(listener)
    }

    /**
     * Removes all listeners for the specified event
     * @param event event name
     */
    clear(event: string) {
        if (this.listeners.has(event))
            this.listeners.get(event)!.clear()
    }

    /**
     * Emits an event with the given arguments
     * @param event event name
     * @param args arguments to pass to the listeners
     */
    emit(event: string, ...args: any[]) {
        if (this.listeners.has(event))
            this.listeners.get(event)!.forEach((listener) => listener(...args))
    }
}