import { ApplicationRef } from 'angular2/src/core/application_ref';
import { isPresent, NumberWrapper } from 'angular2/src/facade/lang';
import { window } from 'angular2/src/facade/browser';
import { DOM } from 'angular2/src/platform/dom/dom_adapter';
/**
 * Entry point for all Angular debug tools. This object corresponds to the `ng`
 * global variable accessible in the dev console.
 */
export class AngularTools {
    constructor(ref) {
        this.profiler = new AngularProfiler(ref);
    }
}
/**
 * Entry point for all Angular profiling-related debug tools. This object
 * corresponds to the `ng.profiler` in the dev console.
 */
export class AngularProfiler {
    constructor(ref) {
        this.appRef = ref.injector.get(ApplicationRef);
    }
    /**
     * Exercises change detection in a loop and then prints the average amount of
     * time in milliseconds how long a single round of change detection takes for
     * the current state of the UI. It runs a minimum of 5 rounds for a minimum
     * of 500 milliseconds.
     *
     * Optionally, a user may pass a `config` parameter containing a map of
     * options. Supported options are:
     *
     * `record` (boolean) - causes the profiler to record a CPU profile while
     * it exercises the change detector. Example:
     *
     * ```
     * ng.profiler.timeChangeDetection({record: true})
     * ```
     */
    timeChangeDetection(config) {
        var record = isPresent(config) && config['record'];
        var profileName = 'Change Detection';
        // Profiler is not available in Android browsers, nor in IE 9 without dev tools opened
        var isProfilerAvailable = isPresent(window.console.profile);
        if (record && isProfilerAvailable) {
            window.console.profile(profileName);
        }
        var start = DOM.performanceNow();
        var numTicks = 0;
        while (numTicks < 5 || (DOM.performanceNow() - start) < 500) {
            this.appRef.tick();
            numTicks++;
        }
        var end = DOM.performanceNow();
        if (record && isProfilerAvailable) {
            // need to cast to <any> because type checker thinks there's no argument
            // while in fact there is:
            //
            // https://developer.mozilla.org/en-US/docs/Web/API/Console/profileEnd
            window.console.profileEnd(profileName);
        }
        var msPerTick = (end - start) / numTicks;
        window.console.log(`ran ${numTicks} change detection cycles`);
        window.console.log(`${NumberWrapper.toFixed(msPerTick, 2)} ms per check`);
    }
}
