/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko.tests.helpers;

import org.mozilla.gecko.Actions;
import org.mozilla.gecko.Actions.EventExpecter;
import org.mozilla.gecko.GeckoThread;
import org.mozilla.gecko.tests.UITestContext;

import android.app.Activity;

/**
 * Provides helper functions for accessing the underlying Gecko engine.
 */
public final class GeckoHelper {
    private static Activity sActivity;
    private static Actions sActions;

    private GeckoHelper() { /* To disallow instantiation. */ }

    protected static void init(final UITestContext context) {
        sActivity = context.getActivity();
        sActions = context.getActions();
    }

    public static void blockForReady() {
        blockForEvent(Actions.EventType.GECKO, "Gecko:Ready");
    }

    /**
     * Blocks for the "Gecko:DelayedStartup" event, which occurs after "Gecko:Ready" and the
     * first page load.
     */
    public static void blockForDelayedStartup() {
        blockForEvent(Actions.EventType.UI, "Gecko:DelayedStartup");
    }

    private static void blockForEvent(final Actions.EventType type, final String eventName) {
        final EventExpecter eventExpecter = sActions.expectGlobalEvent(type, eventName);

        if (!GeckoThread.isRunning()) {
            eventExpecter.blockForEvent();
        }

        eventExpecter.unregisterListener();
    }
}
