/** PURE_IMPORTS_START .._util_isNumeric,.._Observable,.._scheduler_async PURE_IMPORTS_END */
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b)
        if (b.hasOwnProperty(p))
            d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { isNumeric } from '../util/isNumeric';
import { Observable } from '../Observable';
import { async } from '../scheduler/async';
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
export var IntervalObservable = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
    __extends(IntervalObservable, _super);
    function IntervalObservable(period, scheduler) {
        if (period === void 0) {
            period = 0;
        }
        if (scheduler === void 0) {
            scheduler = async;
        }
        _super.call(this);
        this.period = period;
        this.scheduler = scheduler;
        if (!isNumeric(period) || period < 0) {
            this.period = 0;
        }
        if (!scheduler || typeof scheduler.schedule !== 'function') {
            this.scheduler = async;
        }
    }
    /**
     * Creates an Observable that emits sequential numbers every specified
     * interval of time, on a specified IScheduler.
     *
     * <span class="informal">Emits incremental numbers periodically in time.
     * </span>
     *
     * <img src="./img/interval.png" width="100%">
     *
     * `interval` returns an Observable that emits an infinite sequence of
     * ascending integers, with a constant interval of time of your choosing
     * between those emissions. The first emission is not sent immediately, but
     * only after the first period has passed. By default, this operator uses the
     * `async` IScheduler to provide a notion of time, but you may pass any
     * IScheduler to it.
     *
     * @example <caption>Emits ascending numbers, one every second (1000ms)</caption>
     * var numbers = Rx.Observable.interval(1000);
     * numbers.subscribe(x => console.log(x));
     *
     * @see {@link timer}
     * @see {@link delay}
     *
     * @param {number} [period=0] The interval size in milliseconds (by default)
     * or the time unit determined by the scheduler's clock.
     * @param {Scheduler} [scheduler=async] The IScheduler to use for scheduling
     * the emission of values, and providing a notion of "time".
     * @return {Observable} An Observable that emits a sequential number each time
     * interval.
     * @static true
     * @name interval
     * @owner Observable
     */
    IntervalObservable.create = function (period, scheduler) {
        if (period === void 0) {
            period = 0;
        }
        if (scheduler === void 0) {
            scheduler = async;
        }
        return new IntervalObservable(period, scheduler);
    };
    IntervalObservable.dispatch = function (state) {
        var index = state.index, subscriber = state.subscriber, period = state.period;
        subscriber.next(index);
        if (subscriber.closed) {
            return;
        }
        state.index += 1;
        this.schedule(state, period);
    };
    /** @deprecated internal use only */ IntervalObservable.prototype._subscribe = function (subscriber) {
        var index = 0;
        var period = this.period;
        var scheduler = this.scheduler;
        subscriber.add(scheduler.schedule(IntervalObservable.dispatch, period, {
            index: index, subscriber: subscriber, period: period
        }));
    };
    return IntervalObservable;
}(Observable));
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