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

import {
    SegmentAnalyticsInterface,
    TrackingEventInterface,
    TrackingServiceInterface,
} from './../../../models/index';

@Injectable()
export class SegmentTrackingService
    implements TrackingServiceInterface {

    public i: number = 0;

    constructor(
        @Inject('segmentAnalytics')
        private _segmentAnalytics: SegmentAnalyticsInterface,
    ) {}

    public sendEvent(
        event: TrackingEventInterface,
    ) {
        this._waitForSegment(
            'track',
            () => {
                this._segmentAnalytics.track(
                    event.name,
                    event.properties,
                    event.options,
                    event.callback || undefined,
                );
            },
        );
    }

    public sendPage(
        event: TrackingEventInterface,
    ) {
        this._waitForSegment(
            'page',
            () => {
                this._segmentAnalytics.page(
                    event.category || undefined,
                    event.name,
                    event.properties,
                    event.options,
                    event.callback || undefined,
                );
            },
        );
    }

    private _waitForSegment(
        segmentMethod: string,
        success: () => void,
    ) {
        if (this._segmentAnalytics[segmentMethod]) {
            success();
        } else if (this.i < 58) {

            setTimeout(() => {
                this.i++;
                this._waitForSegment(
                    segmentMethod,
                    success,
                );
            }, 1000);
        }
    }
}