import {
    Inject,
    Injectable,
} from '@angular/core';

@Injectable()
export class WindowResizeEventsService {
    public events: Map<number, () => void>
        = new Map<number, () => void>();

    private _resizeTimer: number;
    private _currentEventID = 0;

    constructor(
        @Inject('window')
        private _window: Window,
    ) {
        this._window.addEventListener('resize', () => {
            clearTimeout(this._resizeTimer);
            this._resizeTimer = window.setTimeout(() => {
                this.events.forEach((event) => event());
            }, 250);
        });
    }

    public addEvent(func: () => void) {
        this.events.set(
            this._currentEventID,
            func,
        );
        this._currentEventID++;
        return this._currentEventID;
    }

    public removeEvent(
        eventKey: number,
    ) {
        this.events.delete(eventKey);
    }
}