package ovh.gasser.newshapes;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import ovh.gasser.newshapes.attributes.SelectionAttributes;
import ovh.gasser.newshapes.shapes.Shape;
import ovh.gasser.newshapes.ui.listeners.SelectionListener;
import ovh.gasser.newshapes.util.Streamable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

public class Selection implements Streamable<Shape> {
    private final static Logger logger = LoggerFactory.getLogger(Selection.class);

    private final List<Shape> selectedShapes = new ArrayList<>();
    private final List<SelectionListener> listeners = new ArrayList<>();

    @Override
    public Iterator<Shape> iterator() {
        return selectedShapes.iterator();
    }

    public void clear() {
        for (Shape shape : selectedShapes) {
            shape.addAttributes(new SelectionAttributes(false));
        }
        selectedShapes.clear();
        notifyListeners();
    }

    public void add(Shape s) {
        logger.info("Selection.add");
        selectedShapes.add(s);
        s.addAttributes(new SelectionAttributes(true));
        notifyListeners();
    }

    public boolean isEmpty() {
        return selectedShapes.isEmpty();
    }

    public List<Shape> getSelectedShapes() {
        return List.copyOf(selectedShapes);
    }

    public void addListener(SelectionListener listener) {
        this.listeners.add(listener);
    }

    private void notifyListeners(){
        listeners.forEach(l -> l.onSelectionChanged(Collections.unmodifiableCollection(selectedShapes)));
    }
}