/** PURE_IMPORTS_START tslib,_OuterSubscriber,_util_subscribeToResult PURE_IMPORTS_END */
import * as tslib_1 from "tslib";
import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
export function expand(project, concurrent, scheduler) {
    if (concurrent === void 0) {
        concurrent = Number.POSITIVE_INFINITY;
    }
    if (scheduler === void 0) {
        scheduler = undefined;
    }
    concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent;
    return function (source) { return source.lift(new ExpandOperator(project, concurrent, scheduler)); };
}
var ExpandOperator = /*@__PURE__*/ (function () {
    function ExpandOperator(project, concurrent, scheduler) {
        this.project = project;
        this.concurrent = concurrent;
        this.scheduler = scheduler;
    }
    ExpandOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new ExpandSubscriber(subscriber, this.project, this.concurrent, this.scheduler));
    };
    return ExpandOperator;
}());
export { ExpandOperator };
var ExpandSubscriber = /*@__PURE__*/ (function (_super) {
    tslib_1.__extends(ExpandSubscriber, _super);
    function ExpandSubscriber(destination, project, concurrent, scheduler) {
        var _this = _super.call(this, destination) || this;
        _this.project = project;
        _this.concurrent = concurrent;
        _this.scheduler = scheduler;
        _this.index = 0;
        _this.active = 0;
        _this.hasCompleted = false;
        if (concurrent < Number.POSITIVE_INFINITY) {
            _this.buffer = [];
        }
        return _this;
    }
    ExpandSubscriber.dispatch = function (arg) {
        var subscriber = arg.subscriber, result = arg.result, value = arg.value, index = arg.index;
        subscriber.subscribeToProjection(result, value, index);
    };
    ExpandSubscriber.prototype._next = function (value) {
        var destination = this.destination;
        if (destination.closed) {
            this._complete();
            return;
        }
        var index = this.index++;
        if (this.active < this.concurrent) {
            destination.next(value);
            try {
                var project = this.project;
                var result = project(value, index);
                if (!this.scheduler) {
                    this.subscribeToProjection(result, value, index);
                }
                else {
                    var state = { subscriber: this, result: result, value: value, index: index };
                    var destination_1 = this.destination;
                    destination_1.add(this.scheduler.schedule(ExpandSubscriber.dispatch, 0, state));
                }
            }
            catch (e) {
                destination.error(e);
            }
        }
        else {
            this.buffer.push(value);
        }
    };
    ExpandSubscriber.prototype.subscribeToProjection = function (result, value, index) {
        this.active++;
        var destination = this.destination;
        destination.add(subscribeToResult(this, result, value, index));
    };
    ExpandSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (this.hasCompleted && this.active === 0) {
            this.destination.complete();
        }
        this.unsubscribe();
    };
    ExpandSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this._next(innerValue);
    };
    ExpandSubscriber.prototype.notifyComplete = function (innerSub) {
        var buffer = this.buffer;
        var destination = this.destination;
        destination.remove(innerSub);
        this.active--;
        if (buffer && buffer.length > 0) {
            this._next(buffer.shift());
        }
        if (this.hasCompleted && this.active === 0) {
            this.destination.complete();
        }
    };
    return ExpandSubscriber;
}(OuterSubscriber));
export { ExpandSubscriber };
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