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import * as _ from 'lodash';
import { Dispatch } from 'redux';
import { PROGRESS_STALL_AT_PERCENTAGE, PROGRESS_TICK_INTERVAL_MS } from '../constants';
import { Action, actions } from '../redux/actions';
const curTimeUnix = () => {
return new Date().getTime();
};
enum TickingState {
None,
Running,
Finishing,
}
interface TickingNoneState {
state: TickingState.None;
}
interface TickingRunningStatus {
state: TickingState.Running;
}
interface TickingFinishingStatus {
state: TickingState.Finishing;
increasePercentageEveryTick: number;
}
type TickingStatus = TickingNoneState | TickingRunningStatus | TickingFinishingStatus;
const TICKS_PER_SECOND = 1000 / PROGRESS_TICK_INTERVAL_MS;
export class Progress {
private _startTimeUnix?: number;
private _expectedTimeMs?: number;
private _intervalId?: number;
private _percentageDone: number;
private _tickingStatus: TickingStatus;
constructor() {
this._startTimeUnix = undefined;
this._expectedTimeMs = undefined;
this._percentageDone = 0;
this._intervalId = undefined;
this._tickingStatus = { state: TickingState.None };
// TODO: clear interval
}
public beginRunning(expectedTimeMs: number): void {
this._clearTimer();
this._startTimeUnix = curTimeUnix();
this._expectedTimeMs = expectedTimeMs;
this._percentageDone = 0;
this._intervalId = window.setInterval(this._tick.bind(this), PROGRESS_TICK_INTERVAL_MS);
this._tickingStatus = { state: TickingState.Running };
}
public setFinishing(): void {
const percentLeft = 100 - this._percentageDone;
const increasePercentageEveryTick = percentLeft / TICKS_PER_SECOND;
this._tickingStatus = {
state: TickingState.Finishing,
increasePercentageEveryTick,
};
}
private _tick(): void {
const rawPercentageDone =
this._tickingStatus.state === TickingState.Finishing
? this._getNewPercentageFinishing(this._tickingStatus)
: this._getNewPercentageNormal();
const maxPercentage = this._tickingStatus.state === TickingState.Finishing ? 100 : PROGRESS_STALL_AT_PERCENTAGE;
const percentageDone = Math.min(rawPercentageDone, maxPercentage);
this._percentageDone = percentageDone;
console.log('percentageDone', this._percentageDone);
if (percentageDone >= 100) {
this._clearTimer();
}
return;
}
private _clearTimer(): void {
if (this._intervalId) {
window.clearTimeout(this._intervalId);
}
}
private _getNewPercentageNormal(): number {
if (_.isUndefined(this._startTimeUnix) || _.isUndefined(this._expectedTimeMs)) {
throw new Error('Cant tick, missing var');
}
const elapsedTimeMs = curTimeUnix() - this._startTimeUnix;
const safeElapsedTimeMs = Math.max(elapsedTimeMs, 1);
const percentageDone = safeElapsedTimeMs / this._expectedTimeMs * 100;
return percentageDone;
}
private _getNewPercentageFinishing(finishingState: TickingFinishingStatus): number {
return this._percentageDone + finishingState.increasePercentageEveryTick;
}
}
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