// Copyright (c) Microsoft Corporation. All rights reserved.

// Licensed under the MIT License.

'use strict';

import { EventEmitter } from 'events';

const THRESHOLD_FOR_FEATURE_USAGE = 1000;

const THRESHOLD_FOR_TEXT_EDIT = 5000;

const FEARTURES_USAGE_COUNTER = 'FEARTURES_USAGE';

const TEXT_EDIT_COUNTER = 'TEXT_EDIT';

type counters = 'FEARTURES_USAGE' | 'TEXT_EDIT';

export class FeedbackCounters extends EventEmitter {

private counters = new Map<string, { counter: number, threshold: number }>();

constructor() {

super();

this.createCounters();

}

public incrementEditCounter(): void {

this.incrementCounter(TEXT_EDIT_COUNTER);

}

public incrementFeatureUsageCounter(): void {

this.incrementCounter(FEARTURES_USAGE_COUNTER);

}

private createCounters() {

this.counters.set(TEXT_EDIT_COUNTER, { counter: 0, threshold: THRESHOLD_FOR_TEXT_EDIT });

this.counters.set(FEARTURES_USAGE_COUNTER, { counter: 0, threshold: THRESHOLD_FOR_FEATURE_USAGE });

}

private incrementCounter(counterName: counters): void {

if (!this.counters.has(counterName)) {

console.error(`Counter ${counterName} not supported in the feedback module of the Python Extension`);

return;

}

// tslint:disable-next-line:no-non-null-assertion

const value = this.counters.get(counterName)!;

value.counter += 1;

this.checkThreshold(counterName);

}

private checkThreshold(counterName: string) {

// tslint:disable-next-line:no-non-null-assertion

const value = this.counters.get(counterName)!;

if (value.counter < value.threshold) {

return;

}

this.emit('thresholdReached');

}

}