/*

 * Copyright (c) 2008-2011, Matthias Mann

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *     * Redistributions of source code must retain the above copyright notice,

 *       this list of conditions and the following disclaimer.

 *     * Redistributions in binary form must reproduce the above copyright

 *       notice, this list of conditions and the following disclaimer in the

 *       documentation and/or other materials provided with the distribution.

 *     * Neither the name of Matthias Mann nor the names of its contributors may

 *       be used to endorse or promote products derived from this software

 *       without specific prior written permission.

 *

 * 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 THE COPYRIGHT OWNER OR

 * CONTRIBUTORS 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 nodes;

import de.matthiasmann.twl.Event;

import de.matthiasmann.twl.Widget;

import de.matthiasmann.twl.renderer.AnimationState.StateKey;

/**

 *

 * @author Matthias Mann

 */

public class Pad extends Widget {

    public static final StateKey STATE_HOVER            = StateKey.get("hover");

    public static final StateKey STATE_DRAG_DESTINATION = StateKey.get("dragDestination");

    public static final int RADIUS = 5;

    private final Node node;

    private final boolean input;

    private Connection inConnection;

    private boolean isDragActive;

    private Pad dragDestinationPad;

    public Pad(Node node, boolean input) {

        this.node = node;

        this.input = input;

    }

    public Node getNode() {

        return node;

    }

    public boolean isInput() {

        return input;

    }

    public Connection getInConnection() {

        return inConnection;

    }

    public void setInConnection(Connection inConnection) {

        this.inConnection = inConnection;

    }

    @Override

    protected boolean handleEvent(Event evt) {

        if(evt.isMouseEvent()) {

            getAnimationState().setAnimationState(STATE_HOVER, evt.getType() != Event.Type.MOUSE_EXITED);

        }

        if(evt.getType() == Event.Type.MOUSE_DRAGGED) {

            NodeArea nodeArea = node.getNodeArea();

            if(!isDragActive) {

                isDragActive = true;

                if(isInput()) {

                    nodeArea.removeConnection(getInConnection());

                }

            }

            nodeArea.dragNewConnection(this, evt.getMouseX(), evt.getMouseY());

            Pad pad = nodeArea.padFromMouse(evt.getMouseX(), evt.getMouseY());

            setDragDestPad(pad);

        }

        if(isDragActive && evt.isMouseDragEnd()) {

            NodeArea nodeArea = node.getNodeArea();

            if(dragDestinationPad != null) {

                if(isInput()) {

                    nodeArea.addConnection(dragDestinationPad, this);

                } else {

                    nodeArea.addConnection(this, dragDestinationPad);

                }

            }

            setDragDestPad(null);

            nodeArea.dragNewConnection(null, 0, 0);

            isDragActive = false;

        }

        return evt.isMouseEventNoWheel();

    }

    @Override

    public int getPreferredHeight() {

        return RADIUS*2;

    }

    @Override

    public int getPreferredWidth() {

        return RADIUS*2;

    }

    public int getCenterX() {

        return getX() + RADIUS;

    }

    public int getCenterY() {

        return getY() + RADIUS;

    }

    @Override

    public boolean isInside(int x, int y) {

        int dx = x - getCenterX();

        int dy = y - getCenterY();

        return dx*dx + dy*dy <= RADIUS*RADIUS;

    }

    private void setDragDestPad(Pad pad) {

        if(pad != dragDestinationPad) {

            if(dragDestinationPad != null) {

                dragDestinationPad.getAnimationState().setAnimationState(STATE_DRAG_DESTINATION, false);

            }

            dragDestinationPad = pad;

            if(dragDestinationPad != null) {

                dragDestinationPad.getAnimationState().setAnimationState(STATE_DRAG_DESTINATION, true);

            }

        }

    }

}