/*
 * Copyright (C) 2024 JPEXS
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.jpexs.decompiler.flash.easygui.properties;

import java.awt.AWTEvent;
import java.awt.BasicStroke;
import java.awt.CardLayout;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Stroke;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Line2D;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 *
 * @author JPEXS
 */
public abstract class AbstractPropertyField<E> extends JPanel {
    private static final String CARD_READ = "Read";
    private static final String CARD_WRITE = "Write";
    
    protected JLabel readLabel;
    protected JTextField writeField;
    
    private final List<PropertyValidationInteface<E>> validations = new ArrayList<>();
    private final List<ChangeListener> changeListeners = new ArrayList<>();
    
    private AWTEventListener aeListener;
    
    private boolean undetermined = false;
    
    public void addValidation(PropertyValidationInteface<E> validation) {
        validations.add(validation);
    }
    
    public void removeValidation(PropertyValidationInteface<E> validation) {
        validations.remove(validation);
    }
    
    public void addChangeListener(ChangeListener changeListener) {
        changeListeners.add(changeListener);
    }
    
    public void removeChangeListener(ChangeListener changeListener) {
        changeListeners.remove(changeListener);
    }
    
    private void fireChange() {
        for (ChangeListener listener : changeListeners) {
            listener.stateChanged(new ChangeEvent(this));
        }
    }
    
    @SuppressWarnings("unchecked")        
    public AbstractPropertyField(String text) {
        setLayout(new CardLayout());
        readLabel = new DottedUnderlineLabel(text);        
               
        readLabel.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
        writeField = new JTextField(text);
        add(readLabel, CARD_READ);
        add(writeField, CARD_WRITE);
        
        readLabel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                if (e.getClickCount() == 1) {
                    ((CardLayout)AbstractPropertyField.this.getLayout()).show(AbstractPropertyField.this, CARD_WRITE);
                    writeField.requestFocus();
                    writeField.selectAll();
                    
                    Toolkit.getDefaultToolkit().addAWTEventListener(aeListener, AWTEvent.MOUSE_EVENT_MASK);
                }
            }            
        });
        
        writeField.addFocusListener(new FocusAdapter() {
            @Override
            public void focusLost(FocusEvent e) {
                finishEdit();
            }            
        });
        writeField.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent e) {
                if (e.getKeyCode() == KeyEvent.VK_ENTER) {
                    e.consume();
                    finishEdit();
                }    
                if (e.getKeyCode() == KeyEvent.VK_ESCAPE) {
                    e.consume();
                    cancelEdit();
                }
            }
        });  
        
        aeListener = new AWTEventListener() {
            @Override
            public void eventDispatched(AWTEvent event) {
                if (event instanceof MouseEvent) {
                    MouseEvent me = (MouseEvent) event;
                    if (!SwingUtilities.isDescendingFrom(me.getComponent(), writeField)) {
                        if (me.getClickCount() > 0) {
                            finishEdit();
                        }
                    }
                }
            }
        };
        
        
    }
    
    protected abstract E textToValue(String text);
    protected abstract String valueToText(E value);
    
    private void finishEdit() {
        
        String textBefore = readLabel.getText();
        String textAfter = writeField.getText();
        
        if (textBefore.equals(textAfter)) {
            cancelEdit();
            return;
        }
        
        Toolkit.getDefaultToolkit().removeAWTEventListener(aeListener);
        
        boolean ok = true;
        E value = textToValue(textAfter);
        if (value == null) {
            ok = false;
        } else {  
            for (PropertyValidationInteface<E> validation : validations) {
                if (!validation.validate(value)) {
                    ok = false;
                    break;
                }
            }
        }
        
        if (!ok) {
            cancelEdit();
            return;
        }
        undetermined = false;
        readLabel.setText(valueToText(value));
        ((CardLayout)AbstractPropertyField.this.getLayout()).show(AbstractPropertyField.this, CARD_READ);
        fireChange();
    }
    
    private void cancelEdit() {
        Toolkit.getDefaultToolkit().removeAWTEventListener(aeListener);        
        if (undetermined) {
            writeField.setText("");
        } else {
            writeField.setText(readLabel.getText());
        }
        ((CardLayout)AbstractPropertyField.this.getLayout()).show(AbstractPropertyField.this, CARD_READ);
    }
    
    public E getValue() {        
        if (undetermined) {
            return null;
        }
        return textToValue(writeField.getText());
    }
    
    public void setValue(Set<E> value) {
        if (value.size() != 1) {
            setValue((E) null);
        } else {
            setValue(value.iterator().next());
        }
    }
    
    public void setValue(E value) {
        if (value == null) {
            readLabel.setText("-");
            writeField.setText("");
            undetermined = true;
            fireChange();
            return;
        }
        String text = valueToText(value);
        readLabel.setText(text);
        writeField.setText(text);
        fireChange();
    }
}

class DottedUnderlineLabel extends JLabel {

    public DottedUnderlineLabel(String text) {
        super(text);
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        Font font = getFont();
        FontMetrics metrics = getFontMetrics(font);
        String text = getText();

        int x = 0;
        int y = metrics.getAscent();
               
        g2d.setPaint(getForeground());
        
        int textWidth = metrics.stringWidth(text);
        int underlineY = y + 6;

        float[] dash = {1f, 1f};
        Stroke dotted = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 1f, dash, 0f);
        g2d.setStroke(dotted);

        g2d.draw(new Line2D.Float(x, underlineY, x + textWidth, underlineY));
    }
}