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 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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 */

package com.sun.javafx.scene.control.behavior;

import javafx.scene.Node;
import javafx.scene.Parent;

import javafx.scene.Scene;
import javafx.scene.input.KeyEvent;

import javafx.beans.value.ChangeListener;
import javafx.event.Event;
import javafx.event.EventDispatcher;
import javafx.event.EventHandler;
import javafx.scene.input.MouseEvent;

import com.sun.javafx.scene.control.skin.ComboBoxPopupControl;

public class TwoLevelFocusListBehavior extends TwoLevelFocusBehavior {

    public TwoLevelFocusListBehavior(Node node) {

        tlNode = node;

        // listen to all keyevents, maybe
        tlNode.addEventHandler(KeyEvent.ANY, keyEventListener);
        tlNode.addEventHandler(MouseEvent.MOUSE_PRESSED, mouseEventListener);
        tlNode.focusedProperty().addListener(focusListener);

        // block ScrollEvent from being passed down to scrollbar's skin
        origEventDispatcher = tlNode.getEventDispatcher();
        tlNode.setEventDispatcher(tlfEventDispatcher);
    }

    /**
     * Invoked by the behavior when it is disposed, so that any listeners installed by
     * the TwoLevelFocusBehavior can also be uninstalled
     */
    public void dispose() {
        tlNode.removeEventHandler(KeyEvent.ANY, keyEventListener);
        tlNode.removeEventHandler(MouseEvent.MOUSE_PRESSED, mouseEventListener);
        tlNode.focusedProperty().removeListener(focusListener);
        tlNode.setEventDispatcher(origEventDispatcher);
    }

    /*
    ** don't allow the Node handle a key event if it is in externalFocus mode.
    ** the only keyboard actions allowed are the navigation keys......
    */
    final EventDispatcher preemptiveEventDispatcher = (event, tail) -> {

        // block the event from being passed down to children
        if (event instanceof KeyEvent && event.getEventType() == KeyEvent.KEY_PRESSED) {
            if (!((KeyEvent)event).isMetaDown() && !((KeyEvent)event).isControlDown()  && !((KeyEvent)event).isAltDown()) {
                if (isExternalFocus()) {
                    //
                    // don't let the behaviour leak any navigation keys when
                    // we're not in blocking mode....
                    //
                    Object obj = event.getTarget();

                    switch (((KeyEvent)event).getCode()) {
                      case TAB :
                          if (((KeyEvent)event).isShiftDown()) {
                              ((Node)obj).impl_traverse(com.sun.javafx.scene.traversal.Direction.PREVIOUS);
                          }
                          else {
                              ((Node)obj).impl_traverse(com.sun.javafx.scene.traversal.Direction.NEXT);
                          }
                          event.consume();
                          break;
                      case UP :
                          ((Node)obj).impl_traverse(com.sun.javafx.scene.traversal.Direction.UP);
                          event.consume();
                          break;
                      case DOWN :
                          ((Node)obj).impl_traverse(com.sun.javafx.scene.traversal.Direction.DOWN);
                          event.consume();
                          break;
                      case LEFT :
                          ((Node)obj).impl_traverse(com.sun.javafx.scene.traversal.Direction.LEFT);
                          event.consume();
                          break;
                      case RIGHT :
                          ((Node)obj).impl_traverse(com.sun.javafx.scene.traversal.Direction.RIGHT);
                          event.consume();
                          break;
                      case ENTER :
                          setExternalFocus(false);
                          event.consume();
                          break;
                      default :
                          // this'll kill mnemonics.... unless!
                          Scene s = tlNode.getScene();
                          Event.fireEvent(s, event);
                          event.consume();
                          break;
                    }
                }
            }
        }
        return event;
    };

    final EventDispatcher tlfEventDispatcher = (event, tail) -> {
        if ((event instanceof KeyEvent)) {
            if (isExternalFocus()) {
                tail = tail.prepend(preemptiveEventDispatcher);
                return tail.dispatchEvent(event);
            }
        }
        return origEventDispatcher.dispatchEvent(event, tail);
    };

    private Event postDispatchTidyup(Event event) {

        // block the event from being passed down to children
        if (event instanceof KeyEvent && event.getEventType() == KeyEvent.KEY_PRESSED) {
            if (!isExternalFocus()) {
                //
                // don't let the behaviour leak any navigation keys when
                // we're not in blocking mode....
                //
                if (!((KeyEvent)event).isMetaDown() && !((KeyEvent)event).isControlDown()  && !((KeyEvent)event).isAltDown()) {
                    switch (((KeyEvent)event).getCode()) {
                      case TAB :
                      case UP :
                      case DOWN :
                      case LEFT :
                      case RIGHT :
                          event.consume();
                          break;

                      case ENTER :
                          setExternalFocus(true);
                          event.consume();
                          break;
                      default :
                          break;
                    }
                }
            }
        }
        return event;
    }


    private final EventHandler<KeyEvent> keyEventListener = e -> {
        postDispatchTidyup(e);
    };


    /*
    **  When a node gets focus, put it in external-focus mode.
    */
    final ChangeListener<Boolean> focusListener = (observable, oldVal, newVal) -> {

        if (newVal && tlPopup != null) {
            setExternalFocus(false);
        }
        else {
            boolean b = true;
            if (tlNode != null) {
                /*
                ** if the ListView is actually the popup for a combobox then
                ** we go straight to internal-focus
                */
                Parent p = tlNode.getParent();
                if (p != null) {
                    if (ComboBoxPopupControl.COMBO_BOX_STYLE_CLASS.equals(p.getStyleClass().toString())) {
                        b = false;
                    }
                }
            }

            setExternalFocus(b);
        }
    };

    private final EventHandler<MouseEvent> mouseEventListener  = e -> {
        setExternalFocus(false);
    };
}
