var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { Injectable } from 'angular2/src/core/di';
import { Map, MapWrapper } from 'angular2/src/facade/collection';
import { scheduleMicroTask } from 'angular2/src/facade/lang';
import { BaseException } from 'angular2/src/facade/exceptions';
import { NgZone } from '../zone/ng_zone';
import { ObservableWrapper } from 'angular2/src/facade/async';
/**
 * The Testability service provides testing hooks that can be accessed from
 * the browser and by services such as Protractor. Each bootstrapped Angular
 * application on the page will have an instance of Testability.
 */
export let Testability = class Testability {
    constructor(_ngZone) {
        this._ngZone = _ngZone;
        /** @internal */
        this._pendingCount = 0;
        /** @internal */
        this._isZoneStable = true;
        /**
         * Whether any work was done since the last 'whenStable' callback. This is
         * useful to detect if this could have potentially destabilized another
         * component while it is stabilizing.
         * @internal
         */
        this._didWork = false;
        /** @internal */
        this._callbacks = [];
        this._watchAngularEvents();
    }
    /** @internal */
    _watchAngularEvents() {
        ObservableWrapper.subscribe(this._ngZone.onUnstable, (_) => {
            this._didWork = true;
            this._isZoneStable = false;
        });
        this._ngZone.runOutsideAngular(() => {
            ObservableWrapper.subscribe(this._ngZone.onStable, (_) => {
                NgZone.assertNotInAngularZone();
                scheduleMicroTask(() => {
                    this._isZoneStable = true;
                    this._runCallbacksIfReady();
                });
            });
        });
    }
    increasePendingRequestCount() {
        this._pendingCount += 1;
        this._didWork = true;
        return this._pendingCount;
    }
    decreasePendingRequestCount() {
        this._pendingCount -= 1;
        if (this._pendingCount < 0) {
            throw new BaseException('pending async requests below zero');
        }
        this._runCallbacksIfReady();
        return this._pendingCount;
    }
    isStable() {
        return this._isZoneStable && this._pendingCount == 0 && !this._ngZone.hasPendingMacrotasks;
    }
    /** @internal */
    _runCallbacksIfReady() {
        if (this.isStable()) {
            // Schedules the call backs in a new frame so that it is always async.
            scheduleMicroTask(() => {
                while (this._callbacks.length !== 0) {
                    (this._callbacks.pop())(this._didWork);
                }
                this._didWork = false;
            });
        }
        else {
            // Not Ready
            this._didWork = true;
        }
    }
    whenStable(callback) {
        this._callbacks.push(callback);
        this._runCallbacksIfReady();
    }
    getPendingRequestCount() { return this._pendingCount; }
    findBindings(using, provider, exactMatch) {
        // TODO(juliemr): implement.
        return [];
    }
    findProviders(using, provider, exactMatch) {
        // TODO(juliemr): implement.
        return [];
    }
};
Testability = __decorate([
    Injectable(), 
    __metadata('design:paramtypes', [NgZone])
], Testability);
/**
 * A global registry of {@link Testability} instances for specific elements.
 */
export let TestabilityRegistry = class TestabilityRegistry {
    constructor() {
        /** @internal */
        this._applications = new Map();
        _testabilityGetter.addToWindow(this);
    }
    registerApplication(token, testability) {
        this._applications.set(token, testability);
    }
    getTestability(elem) { return this._applications.get(elem); }
    getAllTestabilities() { return MapWrapper.values(this._applications); }
    getAllRootElements() { return MapWrapper.keys(this._applications); }
    findTestabilityInTree(elem, findInAncestors = true) {
        return _testabilityGetter.findTestabilityInTree(this, elem, findInAncestors);
    }
};
TestabilityRegistry = __decorate([
    Injectable(), 
    __metadata('design:paramtypes', [])
], TestabilityRegistry);
/* @ts2dart_const */
class _NoopGetTestability {
    addToWindow(registry) { }
    findTestabilityInTree(registry, elem, findInAncestors) {
        return null;
    }
}
/**
 * Set the {@link GetTestability} implementation used by the Angular testing framework.
 */
export function setTestabilityGetter(getter) {
    _testabilityGetter = getter;
}
var _testabilityGetter = new _NoopGetTestability();
