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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.widget;

import org.netbeans.api.visual.action.WidgetAction;
import org.netbeans.api.visual.widget.Scene;
import org.netbeans.api.visual.widget.Widget;

import javax.swing.*;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.geom.AffineTransform;
import org.netbeans.modules.visual.laf.DefaultLookFeel;

/**
 * @author David Kaspar
 */
public class BirdViewWindow extends JWindow implements MouseMotionListener {

    private Scene scene;
    private BirdViewComponent birdView;

    private boolean shown = false;
    private double zoomFactor = 3.0;
    private Point scenePoint;

    private WidgetAction action = new SceneTrackAction ();
    private ViewAncestorListener ancestorListener = new ViewAncestorListener ();

    public BirdViewWindow (final Scene scene) {
        this.scene = scene;
        setSize (new Dimension (256, 256));
        setLayout (new BorderLayout ());
        setAlwaysOnTop (true);

        JPanel pane = new JPanel ();
        pane.setBorder (new CompoundBorder (new LineBorder ((new DefaultLookFeel()).getForeground()/*Color.BLACK*/, 1), new EmptyBorder (1, 1, 1, 1)));
        pane.setLayout (new BorderLayout ());
        add (pane, BorderLayout.CENTER);

        birdView = new BirdViewComponent ();
        birdView.setDoubleBuffered (true);
        pane.add (birdView, BorderLayout.CENTER);
    }

    public void invokeShow () {
        if (scene.getView () == null)
            return;
        if (shown)
            return;
        shown = true;
        birdView.addMouseMotionListener (this);
        scene.getPriorActions ().addAction (action);
        scene.getView ().addAncestorListener (ancestorListener);
        updateForViewPoint (null);
    }

    public void invokeHide () {
        if (! shown)
            return;
        shown = false;
        birdView.removeMouseMotionListener (this);
        scene.getPriorActions ().removeAction (action);
        scene.getView ().removeAncestorListener (ancestorListener);
        updateForViewPoint (null);
    }

    public void invokeRepaint () {
        birdView.repaint ();
    }

    public void setZoomFactor (double zoomFactor) {
        this.zoomFactor = zoomFactor;
        invokeRepaint ();
    }

    public void setWindowSize (Dimension size) {
        Dimension previousSize = getSize ();
        setSize (size);
        if (isShowing ()) {
            Point location = getLocation ();
            setLocation (location.x + (previousSize.width - size.width) / 2, location.y + (previousSize.height - size.height) / 2);
            validate ();
        }
    }

    private void updateForViewPoint (Point viewPoint) {
        JComponent view = scene.getView ();
        if (! shown  ||  viewPoint == null  ||  ! view.getVisibleRect ().contains (viewPoint)) {
            scenePoint = null;
            setVisible (false);
            dispose ();
            return;
        }
        scenePoint = scene.convertViewToScene (viewPoint);
        Point viewOrigin = view.getLocationOnScreen ();
        Dimension size = getSize ();
        setBounds (viewOrigin.x + viewPoint.x - size.width / 2, viewOrigin.y + viewPoint.y - size.height / 2, size.width, size.height);
        setVisible (true);
        birdView.repaint();
    }

    private void updateForBirdViewPoint (Point birdViewPoint) {
        JComponent view = scene.getView ();
        if (view.isShowing ()  &&  isShowing ()) {
            Point viewOrigin = view.getLocationOnScreen ();
            Point birdViewOrigin = getLocationOnScreen ();
            Dimension size = getSize ();
            updateForViewPoint (new Point (birdViewPoint.x + birdViewOrigin.x - viewOrigin.x, birdViewPoint.y + birdViewOrigin.y - viewOrigin.y));
        } else
            updateForViewPoint (null);
    }

    public void mouseDragged (MouseEvent e) {
        updateForBirdViewPoint (e.getPoint ());
    }

    public void mouseMoved (MouseEvent e) {
        updateForBirdViewPoint (e.getPoint ());
    }

    private class SceneTrackAction implements WidgetAction {

        public State mouseClicked (Widget widget, WidgetMouseEvent event) {
            return State.CONSUMED;
        }

        public State mousePressed (Widget widget, WidgetMouseEvent event) {
            return State.CONSUMED;
        }

        public State mouseReleased (Widget widget, WidgetMouseEvent event) {
            return State.CONSUMED;
        }

        public State mouseEntered (Widget widget, WidgetMouseEvent event) {
            return State.CONSUMED;
        }

        public State mouseExited (Widget widget, WidgetMouseEvent event) {
            return State.CONSUMED;
        }

        public State mouseDragged (Widget widget, WidgetMouseEvent event) {
            updateForViewPoint (widget.getScene ().convertSceneToView (widget.convertLocalToScene (event.getPoint ())));
            return State.CONSUMED;
        }

        public State mouseMoved (Widget widget, WidgetMouseEvent event) {
            updateForViewPoint (widget.getScene ().convertSceneToView (widget.convertLocalToScene (event.getPoint ())));
            return State.CONSUMED;
        }

        public State mouseWheelMoved (Widget widget, WidgetMouseWheelEvent event) {
            return State.CONSUMED;
        }

        public State keyTyped (Widget widget, WidgetKeyEvent event) {
            return State.CONSUMED;
        }

        public State keyPressed (Widget widget, WidgetKeyEvent event) {
            return State.CONSUMED;
        }

        public State keyReleased (Widget widget, WidgetKeyEvent event) {
            return State.CONSUMED;
        }

        public State focusGained (Widget widget, WidgetFocusEvent event) {
            return State.CONSUMED;
        }

        public State focusLost (Widget widget, WidgetFocusEvent event) {
            return State.CONSUMED;
        }

        public State dragEnter (Widget widget, WidgetDropTargetDragEvent event) {
            return State.CONSUMED;
        }

        public State dragOver (Widget widget, WidgetDropTargetDragEvent event) {
            return State.CONSUMED;
        }

        public State dropActionChanged (Widget widget, WidgetDropTargetDragEvent event) {
            return State.CONSUMED;
        }

        public State dragExit (Widget widget, WidgetDropTargetEvent event) {
            return State.CONSUMED;
        }

        public State drop (Widget widget, WidgetDropTargetDropEvent event) {
            return State.CONSUMED;
        }

    }

    private class BirdViewComponent extends JComponent {

        @Override
        public void paint (Graphics g) {
            Graphics2D gr = (Graphics2D) g;
            super.paint (g);
            if (scenePoint == null) {
                gr.setColor ((new DefaultLookFeel()).getForeground()/*Color.BLACK*/);
                gr.fill (getBounds ());
                return;
            }
            Dimension size = getSize ();
            AffineTransform previousTransform = gr.getTransform ();
            gr.translate (size.width / 2, size.height / 2);
            gr.scale (zoomFactor, zoomFactor);
            gr.translate (- scenePoint.x, - scenePoint.y);
            scene.paint (gr);
            gr.setTransform (previousTransform);
        }

    }

    private class ViewAncestorListener implements AncestorListener {

        public void ancestorAdded (AncestorEvent event) {
        }

        public void ancestorRemoved (AncestorEvent event) {
            invokeHide ();
        }

        public void ancestorMoved (AncestorEvent event) {
        }

    }

}