"use strict";
var __assign = (this && this.__assign) || function () {
    __assign = Object.assign || function(t) {
        for (var s, i = 1, n = arguments.length; i < n; i++) {
            s = arguments[i];
            for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
                t[p] = s[p];
        }
        return t;
    };
    return __assign.apply(this, arguments);
};
Object.defineProperty(exports, "__esModule", { value: true });
var defaultOptions = {
    deferEvents: false
};
var Scheduler = /** @class */ (function () {
    function Scheduler(options) {
        this.processingEvent = false;
        this.queue = [];
        this.initialized = false;
        this.options = __assign({}, defaultOptions, options);
    }
    Scheduler.prototype.initialize = function (callback) {
        this.initialized = true;
        if (callback) {
            if (!this.options.deferEvents) {
                this.schedule(callback);
                return;
            }
            this.process(callback);
        }
        this.flushEvents();
    };
    Scheduler.prototype.schedule = function (task) {
        if (!this.initialized || this.processingEvent) {
            this.queue.push(task);
            return;
        }
        if (this.queue.length !== 0) {
            throw new Error('Event queue should be empty when it is not processing events');
        }
        this.process(task);
        this.flushEvents();
    };
    Scheduler.prototype.flushEvents = function () {
        var nextCallback = this.queue.shift();
        while (nextCallback) {
            this.process(nextCallback);
            nextCallback = this.queue.shift();
        }
    };
    Scheduler.prototype.process = function (callback) {
        this.processingEvent = true;
        try {
            callback();
        }
        catch (e) {
            // there is no use to keep the future events
            // as the situation is not anymore the same
            this.queue = [];
            throw e;
        }
        finally {
            this.processingEvent = false;
        }
    };
    return Scheduler;
}());
exports.Scheduler = Scheduler;
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