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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.netbeans.modules.visual.action;

import org.netbeans.api.visual.action.MoveControlPointProvider;
import org.netbeans.api.visual.action.WidgetAction;
import org.netbeans.api.visual.widget.ConnectionWidget;
import org.netbeans.api.visual.widget.Widget;

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

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

    private MoveControlPointProvider provider;
    private ConnectionWidget.RoutingPolicy routingPolicy;

    private ConnectionWidget movingWidget = null;
    private Point controlPointLocation;
    private int controlPointIndex;
    private Point lastLocation = null;

    public MoveControlPointAction (MoveControlPointProvider provider, ConnectionWidget.RoutingPolicy routingPolicy) {
        this.provider = provider;
        this.routingPolicy = routingPolicy;
    }

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

    @Override
    public State mousePressed (Widget widget, WidgetMouseEvent event) {
        if (isLocked ())
            return State.createLocked (widget, this);
        if (event.getButton () == MouseEvent.BUTTON1  &&  event.getClickCount () == 1) {
            if (widget instanceof ConnectionWidget) {
                ConnectionWidget conn = (ConnectionWidget) widget;
                controlPointIndex = conn.getControlPointHitAt (event.getPoint ());
                if (controlPointIndex >= 0) {
                    movingWidget = conn;
                    controlPointLocation = new Point (conn.getControlPoints (). get (controlPointIndex));
                    lastLocation = new Point (event.getPoint ());
                    return State.createLocked (widget, this);
                } else {
                    movingWidget = null;
                }
            }
        }
        return State.REJECTED;
    }

    @Override
    public State mouseReleased(Widget widget, WidgetMouseEvent event) {
        State state = move(widget, event.getPoint()) ? State.CONSUMED : State.REJECTED;
        movingWidget = null;
        return state;
    }

    @Override
    public State mouseDragged(Widget widget, WidgetMouseEvent event) {
        if (move(widget, event.getPoint())) {
            return State.createLocked(widget, this);
        } else {
            movingWidget = null;
            return State.REJECTED;
        }
    }

    private boolean move(Widget widget, Point newLocation) {
        if (movingWidget != widget)
            return false;

        java.util.List controlPoints = movingWidget.getControlPoints ();
        if (controlPointIndex < 0  ||  controlPointIndex >= controlPoints.size ())
            return false;

        Point location = new Point (controlPointLocation);
        location.translate (newLocation.x - lastLocation.x, newLocation.y - lastLocation.y);

        controlPoints = provider.locationSuggested (movingWidget, controlPointIndex, location);
        if (controlPoints == null)
            return false;

        if (routingPolicy != null)
            movingWidget.setRoutingPolicy (routingPolicy);
        movingWidget.setControlPoints (controlPoints, false);
        return true;
    }

}