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package org.netbeans.modules.visual.action;

import org.netbeans.api.visual.action.MoveProvider;
import org.netbeans.api.visual.action.MoveStrategy;
import org.netbeans.api.visual.action.WidgetAction;
import org.netbeans.api.visual.widget.Widget;

import java.awt.*;
import java.awt.event.MouseEvent;

/**
 * @author David Kaspar
 */
public final class MoveAction extends WidgetAction.LockedAdapter {

    private MoveStrategy strategy;
    private MoveProvider provider;

    private Widget movingWidget = null;
    private Point dragSceneLocation = null;
    private Point originalSceneLocation = null;
    private Point initialMouseLocation = null;

    public MoveAction (MoveStrategy strategy, MoveProvider provider) {
        this.strategy = strategy;
        this.provider = provider;
    }

    protected boolean isLocked () {
        return movingWidget != null;
    }

    public State mousePressed (Widget widget, WidgetMouseEvent event) {
        if (isLocked ())
            return State.createLocked (widget, this);
        if (event.getButton () == MouseEvent.BUTTON1  &&  event.getClickCount () == 1) {
            movingWidget = widget;
            initialMouseLocation = event.getPoint ();
            originalSceneLocation = provider.getOriginalLocation (widget);
            if (originalSceneLocation == null)
                originalSceneLocation = new Point ();
            dragSceneLocation = widget.convertLocalToScene (event.getPoint ());
            provider.movementStarted (widget);
            return State.createLocked (widget, this);
        }
        return State.REJECTED;
    }

    public State mouseReleased (Widget widget, WidgetMouseEvent event) {
        boolean state;
        if (initialMouseLocation != null  &&  initialMouseLocation.equals (event.getPoint ()))
            state = true;
        else
            state = move (widget, event.getPoint ());
        if (state) {
            movingWidget = null;
            dragSceneLocation = null;
            originalSceneLocation = null;
            initialMouseLocation = null;
            provider.movementFinished (widget);
        }
        return state ? State.CONSUMED : State.REJECTED;
    }

    public State mouseDragged (Widget widget, WidgetMouseEvent event) {
        return move (widget, event.getPoint ()) ? State.createLocked (widget, this) : State.REJECTED;
    }

    private boolean move (Widget widget, Point newLocation) {
        if (movingWidget != widget)
            return false;
        initialMouseLocation = null;
        newLocation = widget.convertLocalToScene (newLocation);
        Point location = new Point (originalSceneLocation.x + newLocation.x - dragSceneLocation.x, originalSceneLocation.y + newLocation.y - dragSceneLocation.y);
        provider.setNewLocation (widget, strategy.locationSuggested (widget, originalSceneLocation, location));
        return true;
    }

}
