/*
 * Copyright � 2016 TIBCO Software,Inc.All rights reserved.
 * http://community.jaspersoft.com/project/jaspermobile-android
 *
 * Unless you have purchased a commercial license agreement from TIBCO Jaspersoft,
 * the following license terms apply:
 *
 * This program is part of TIBCO Jaspersoft Mobile for Android.
 *
 * TIBCO Jaspersoft Mobile is free software:you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation,either version 3of the License,or
 * (at your option)any later version.
 *
 * TIBCO Jaspersoft Mobile is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY;without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with TIBCO Jaspersoft Mobile for Android.If not,see
 * <http://www.gnu.org/licenses/lgpl>.
 */

package com.jaspersoft.android.jaspermobile.widget;

import android.os.Looper;

import rx.Observable;
import rx.Subscriber;
import rx.android.MainThreadSubscription;

/**
 * @author Tom Koptel
 * @since 2.3
 */
final class PaginationBarViewPagesOnSubscribe implements Observable.OnSubscribe<Integer> {
    private final AbstractPaginationView mPaginationBarView;

    public PaginationBarViewPagesOnSubscribe(AbstractPaginationView paginationBarView) {
        mPaginationBarView = paginationBarView;
    }

    @Override
    public void call(final Subscriber<? super Integer> subscriber) {
        if (Looper.getMainLooper() != Looper.myLooper()) {
            throw new IllegalStateException(
                    "Must be called from the main thread. Was: " + Thread.currentThread());
        }

        mPaginationBarView.setOnPageChangeListener(new AbstractPaginationView.OnPageChangeListener() {
            @Override
            public void onPageSelected(int currentPage) {
                if (!subscriber.isUnsubscribed()) {
                    subscriber.onNext(currentPage);
                }
            }
        });

        subscriber.add(new MainThreadSubscription() {
            @Override protected void onUnsubscribe() {
                mPaginationBarView.setOnPageChangeListener(null);
            }
        });
    }
}