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API to access position features for the iOS platform
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/*
 * Copyright (c) 2016, Gluon
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.

 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL GLUON BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.gluonhq.charm.down.plugins.ios;

import com.gluonhq.charm.down.Services;
import com.gluonhq.charm.down.plugins.LifecycleEvent;
import com.gluonhq.charm.down.plugins.LifecycleService;
import com.gluonhq.charm.down.plugins.Position;
import com.gluonhq.charm.down.plugins.PositionService;
import javafx.application.Platform;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.ReadOnlyObjectWrapper;

/**
 * An implementation of the
 * {@link PositionService PositionService} for the
 * iOS platform.
 * 
 * Important note: it requires adding to the info.plist file:
 * 
 * {@code 
 *         NSLocationUsageDescription
 *         Reason to use Location Service (iOS 6+)
 *         NSLocationWhenInUseUsageDescription
 *         Reason to use Location Service (iOS 8+)
 * }
 */
public class IOSPositionService implements PositionService {

    static {
        IOSPlatform.init();
        System.loadLibrary("Position");
        initPosition();
    }

    private static ReadOnlyObjectWrapper position;
    
    public IOSPositionService() {
        position = new ReadOnlyObjectWrapper<>();
        
        Services.get(LifecycleService.class).ifPresent(l -> {
            l.addListener(LifecycleEvent.PAUSE, IOSPositionService::stopObserver);
            l.addListener(LifecycleEvent.RESUME, IOSPositionService::startObserver);
        });
        startObserver();
    }

    @Override
    public ReadOnlyObjectProperty positionProperty() {
        return position.getReadOnlyProperty();
    }

    @Override
    public Position getPosition() {
        return positionProperty().get();
    }
    
    // native
    private static native void initPosition(); // init IDs for java callbacks from native
    private static native void startObserver();
    private static native void stopObserver();
    
    // callback
    private void setLocation(double lat, double lon) {
        Position p = new Position(lat, lon);
        Platform.runLater(() -> position.set(p));
    }

}