/*

 * Copyright (c) 2015, 2016, 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 jdk.editpad;

import java.awt.BorderLayout;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.util.MissingResourceException;

import java.util.ResourceBundle;

import java.util.function.Consumer;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

/**

 * A minimal Swing editor as a fallback when the user does not specify an

 * external editor.

 */

class EditPad implements Runnable {

    private static final String L10N_RB_NAME  = "jdk.editpad.resources.l10n";

    private ResourceBundle rb  = null;

    private final String windowLabel;

    private final Consumer<String> errorHandler;

    private final String initialText;

    private final Runnable closeMark;

    private final Consumer<String> saveHandler;

    /**

     * Create an Edit Pad minimal editor.

     *

     * @param windowLabel the label string for the Edit Pad window

     * @param errorHandler a handler for unexpected errors

     * @param initialText the source to load in the Edit Pad

     * @param closeMark a Runnable that is run when Edit Pad closes

     * @param saveHandler a handler for changed source (sent the full source)

     */

    EditPad(String windowLabel, Consumer<String> errorHandler, String initialText,

            Runnable closeMark, Consumer<String> saveHandler) {

        this.windowLabel = windowLabel;

        this.errorHandler = errorHandler;

        this.initialText = initialText;

        this.closeMark = closeMark;

        this.saveHandler = saveHandler;

    }

    @Override

    public void run() {

        JFrame jframe = new JFrame(windowLabel == null

                ? getResourceString("editpad.name")

                : windowLabel);

        Runnable closer = () -> {

            jframe.setVisible(false);

            jframe.dispose();

            closeMark.run();

        };

        jframe.addWindowListener(new WindowAdapter() {

            @Override

            public void windowClosing(WindowEvent e) {

                closer.run();

            }

        });

        jframe.setLocationRelativeTo(null);

        jframe.setLayout(new BorderLayout());

        JTextArea textArea = new JTextArea(initialText);

        textArea.setFont(new Font("monospaced", Font.PLAIN, 13));

        jframe.add(new JScrollPane(textArea), BorderLayout.CENTER);

        jframe.add(buttons(closer, textArea), BorderLayout.SOUTH);

        jframe.setSize(800, 600);

        jframe.setVisible(true);

    }

    private JPanel buttons(Runnable closer, JTextArea textArea) {

        FlowLayout flow = new FlowLayout();

        flow.setHgap(35);

        JPanel buttons = new JPanel(flow);

        addButton(buttons, "editpad.cancel", KeyEvent.VK_C, e -> {

            closer.run();

        });

        addButton(buttons, "editpad.accept", KeyEvent.VK_A, e -> {

            saveHandler.accept(textArea.getText());

        });

        addButton(buttons, "editpad.exit",   KeyEvent.VK_X, e -> {

            saveHandler.accept(textArea.getText());

            closer.run();

        });

        return buttons;

    }

    private void addButton(JPanel buttons, String rkey, int mnemonic, ActionListener action) {

        JButton but = new JButton(getResourceString(rkey));

        but.setMnemonic(mnemonic);

        buttons.add(but);

        but.addActionListener(action);

    }

    private String getResourceString(String key) {

        if (rb == null) {

            try {

                rb = ResourceBundle.getBundle(L10N_RB_NAME);

            } catch (MissingResourceException mre) {

                error("Cannot find ResourceBundle: %s", L10N_RB_NAME);

                return "";

            }

        }

        String s;

        try {

            s = rb.getString(key);

        } catch (MissingResourceException mre) {

            error("Missing resource: %s in %s", key, L10N_RB_NAME);

            return "";

        }

        return s;

    }

    private void error(String fmt, Object... args) {

        errorHandler.accept(String.format(fmt, args));

    }

}