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/*
 * Copyright (c) 2012, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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

import com.sun.javafx.event.EventDispatchChainImpl;
import com.sun.javafx.scene.control.InputField;
import javafx.beans.InvalidationListener;
import javafx.event.EventDispatchChain;
import javafx.scene.Node;
import javafx.scene.control.Skin;
import javafx.scene.control.TextField;

/**
 */
public abstract class InputFieldSkin implements Skin {
    /**
     * The {@code Control} that is referencing this Skin. There is a
     * one-to-one relationship between a {@code Skin} and a {@code Control}.
     * When a {@code Skin} is set on a {@code Control}, this variable is
     * automatically updated.
     */
    protected InputField control;

    /**
     * This textField is used to represent the InputField.
     */
    private InnerTextField textField;

    private InvalidationListener InputFieldFocusListener;
    private InvalidationListener InputFieldStyleClassListener;

    /**
     * Create a new InputFieldSkin.
     * @param control The InputField
     */
    public InputFieldSkin(final InputField control) {
        this.control = control;

        // Create the TextField that we are going to use to represent this InputFieldSkin.
        // The textField restricts input so that only valid digits that contribute to the
        // Money can be input.
        textField = new InnerTextField() {
            @Override public void replaceText(int start, int end, String text) {
                String t = textField.getText() == null ? "" : textField.getText();
                t = t.substring(0, start) + text + t.substring(end);
                if (accept(t)) {
                    super.replaceText(start, end, text);
                }
//                if (!text.matches("[a-z]")) {
//                    super.replaceText(start, end, text);
//                }
            }

            @Override public void replaceSelection(String text) {
                String t = textField.getText() == null ? "" : textField.getText();
                int start = Math.min(textField.getAnchor(), textField.getCaretPosition());
                int end = Math.max(textField.getAnchor(), textField.getCaretPosition());
                t = t.substring(0, start) + text + t.substring(end);
                if (accept(t)) {
                    super.replaceSelection(text);
                }
//
//                if (!text.matches("[a-z]")) {
//                    super.replaceSelection(text);
//                }
            }
        };

        textField.setId("input-text-field");
        textField.setFocusTraversable(false);
        control.getStyleClass().addAll(textField.getStyleClass());
        textField.getStyleClass().setAll(control.getStyleClass());
        control.getStyleClass().addListener(InputFieldStyleClassListener = observable -> {
            textField.getStyleClass().setAll(control.getStyleClass());
        });

//        // Align the text to the right
//        textField.setAlignment(Pos.BASELINE_RIGHT);
        textField.promptTextProperty().bind(control.promptTextProperty());
//        textField.editableProperty().bind(control.editableProperty());
        textField.prefColumnCountProperty().bind(control.prefColumnCountProperty());

        // Whenever the text of the textField changes, we may need to
        // update the value.
        textField.textProperty().addListener(observable -> {
            updateValue();
        });

        // Right now there is some funny business regarding focus in JavaFX. So
        // we will just make sure the TextField gets focus whenever somebody tries
        // to give it to the InputField. This isn't right, but we need to fix
        // this in JavaFX, I don't think I can hack around it
//        textField.setFocusTraversable(false);
        control.focusedProperty().addListener(InputFieldFocusListener = observable -> {
            textField.handleFocus(control.isFocused());
        });
        // getting an exception with this...
//        control.addEventFilter(InputEvent.ANY, new EventHandler() {
//            @Override public void handle(InputEvent t) {
//                if (textField == null) return;
//                textField.fireEvent(t);
//            }
//        });

//        textField.setOnAction(new EventHandler() {
//            @Override public void handle(ActionEvent actionEvent) {
//                // Because TextFieldBehavior fires an action event on the parent of the TextField
//                // (maybe a misfeature?) I don't need to do this. But I think this is
//                // a bug, because having to add an empty event handler to get an
//                // event on the control is odd to say the least!
//                control.fireEvent(new ActionEvent(textField, textField));
//            }
//        });

        updateText();
    }

    @Override public InputField getSkinnable() {
        return control;
    }

    @Override public Node getNode() {
        return textField;
    }

    /**
     * Called by a Skinnable when the Skin is replaced on the Skinnable. This method
     * allows a Skin to implement any logic necessary to clean up itself after
     * the Skin is no longer needed. It may be used to release native resources.
     * The methods {@link #getSkinnable()} and {@link #getNode()}
     * should return null following a call to dispose. Calling dispose twice
     * has no effect.
     */
    @Override
    public void dispose() {
        control.getStyleClass().removeListener(InputFieldStyleClassListener);
        control.focusedProperty().removeListener(InputFieldFocusListener);
        textField = null;
    }

    protected abstract boolean accept(String text);
    protected abstract void updateText();
    protected abstract void updateValue();

    protected TextField getTextField() {
        return textField;
    }

    private class InnerTextField extends TextField {
        public void handleFocus(boolean b) {
            setFocused(b);
        }

        @Override public EventDispatchChain buildEventDispatchChain(EventDispatchChain tail) {
            EventDispatchChain chain = new EventDispatchChainImpl();
            chain.append(textField.getEventDispatcher());
            return chain;
        }
   }
}