package edu.jiangxin.apktoolbox.convert.base;
   
   import edu.jiangxin.apktoolbox.swing.extend.EasyPanel;
   import edu.jiangxin.apktoolbox.utils.Constants;
   import org.apache.commons.lang3.StringUtils;
   
   import javax.swing.*;
   import javax.swing.event.DocumentEvent;
   import javax.swing.event.DocumentListener;
  import javax.swing.text.*;
  import java.awt.*;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.io.Serial;
  import java.math.BigInteger;
  import java.util.ArrayList;
  import java.util.List;
  
  public class BaseConvertPanel extends EasyPanel {
      @Serial
      private static final long serialVersionUID = 1L;
  
      private static final String PROPERTY_KEY = "name";
  
      private static final String DECIMAL = "Decimal";
  
      private static final String BINARY = "Binary";
  
      private static final String OCTAL = "Octal";
  
      private static final String HEX = "Hex";
  
      private transient DocumentListener documentListener;
  
      private transient DocumentFilter documentFilter;
  
      private boolean isChangedByUser;
  
      private transient final List<BaseUiObject> baseUiObjects = new ArrayList<>();
  
      @Override
      public void initUI() {
          BoxLayout boxLayout = new BoxLayout(this, BoxLayout.Y_AXIS);
          setLayout(boxLayout);
  
          documentListener = new TextFieldDocumentListener();
          documentFilter = new TextFieldDocumentFilter();
  
          isChangedByUser = true;
  
          baseUiObjects.add(new BaseUiObject(2));
          baseUiObjects.add(new BaseUiObject(8));
          baseUiObjects.add(new BaseUiObject(10));
          baseUiObjects.add(new BaseUiObject(16));
  
          for (BaseUiObject baseUiObject : baseUiObjects) {
              add(baseUiObject.panel);
              add(Box.createVerticalStrut(Constants.DEFAULT_Y_BORDER));
          }
  
          JButton clearBtn = new JButton("Clear");
          clearBtn.addActionListener(new ClearButtonActionListener());
          add(clearBtn);
      }
  
  
      class ClearButtonActionListener implements ActionListener {
          @Override
          public void actionPerformed(ActionEvent arg0) {
              isChangedByUser = false;
              for (BaseUiObject baseUiObject : baseUiObjects) {
                  baseUiObject.textField.setText("");
              }
              isChangedByUser = true;
          }
      }
  
      class TextFieldDocumentListener implements DocumentListener {
          @Override
          public void changedUpdate(DocumentEvent e) {
          }
  
          @Override
          public void insertUpdate(DocumentEvent e) {
              detect(e);
          }
  
          @Override
          public void removeUpdate(DocumentEvent e) {
              detect(e);
          }
      }
  
      class TextFieldDocumentFilter extends DocumentFilter {
          @Override
          public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr) throws BadLocationException {
              Document doc = fb.getDocument();
              StringBuilder sb = new StringBuilder();
              sb.append(doc.getText(0, doc.getLength()));
             sb.insert(offset, string);
 
             Object propertyObj = doc.getProperty(PROPERTY_KEY);
             if (propertyObj == null) {
                 Toolkit.getDefaultToolkit().beep();
                 return;
             }
             Integer radix = (Integer) doc.getProperty(PROPERTY_KEY);
             if (isValidText(radix, sb.toString())) {
                 super.insertString(fb, offset, string, attr);
             } else {
                 Toolkit.getDefaultToolkit().beep();
             }
         }
 
         @Override
         public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
             Document doc = fb.getDocument();
             StringBuilder sb = new StringBuilder();
             sb.append(doc.getText(0, doc.getLength()));
             sb.replace(offset, offset + length, text);
 
             Object propertyObj = doc.getProperty(PROPERTY_KEY);
             if (propertyObj == null) {
                 Toolkit.getDefaultToolkit().beep();
                 return;
             }
             Integer radix = (Integer) doc.getProperty(PROPERTY_KEY);
             if (isValidText(radix, sb.toString())) {
                 super.replace(fb, offset, length, text, attrs);
             } else {
                 Toolkit.getDefaultToolkit().beep();
             }
         }
     }
 
     private void detect(DocumentEvent documentEvent) {
         Document doc = documentEvent.getDocument();
         Integer radix = (Integer) doc.getProperty(PROPERTY_KEY);
         convertMe(radix);
     }
 
     private void convertMe(int radix) {
         if (!isChangedByUser) {
             return;
         }
 
         BigInteger value = null;
         for (BaseUiObject baseUiObject : baseUiObjects) {
             if (baseUiObject.radix == radix) {
                 String text = baseUiObject.textField.getText();
                 if (StringUtils.isEmpty(text)) {
                     value = null;
                 } else {
                     value = new BigInteger(text, radix);
                 }
             }
         }
         isChangedByUser = false;
         for (BaseUiObject baseUiObject : baseUiObjects) {
             if (baseUiObject.radix != radix) {
                 if (value == null) {
                     baseUiObject.textField.setText("");
                 } else {
                     baseUiObject.textField.setText(value.toString(baseUiObject.radix));
                 }
             }
         }
         isChangedByUser = true;
     }
 
     private boolean isBinStr(String str) {
         if (str == null) {
             return false;
         }
         for (int i = 0; i < str.length(); i++) {
             if ((str.charAt(i) != '1') && (str.charAt(i) != '0')) {
                 return false;
             }
         }
         return true;
     }
 
     private boolean isDecStr(String str) {
         if (str == null) {
             return false;
         }
         for (int i = 0; i < str.length(); i++) {
             if ((str.charAt(i) < '0') || (str.charAt(i) > '9')) {
                 return false;
             }
         }
         return true;
     }
 
     private boolean isOctStr(String str) {
         if (str == null) {
             return false;
         }
         for (int i = 0; i < str.length(); i++) {
             if ((str.charAt(i) < '0') || (str.charAt(i) > '7')) {
                 return false;
             }
         }
         return true;
     }
 
     private boolean isHexStr(String str) {
         if (str == null) {
             return false;
         }
         for (int i = 0; i < str.length(); i++) {
             char c = str.charAt(i);
             if ((c < '0' || c > '9') && (c < 'A' || c > 'F') && (c < 'a' || c > 'f')) {
                 return false;
             }
         }
         return true;
     }
 
     private boolean isValidText(int radix, String text) {
         switch (radix) {
             case 2 -> {
                 return isBinStr(text);
             }
             case 8 -> {
                 return isOctStr(text);
             }
             case 10 -> {
                 return isDecStr(text);
             }
             case 16 -> {
                 return isHexStr(text);
             }
             default -> {
                 return false;
             }
         }
     }
 
     class BaseUiObject {
         int radix;
 
         JPanel panel;
 
         JLabel label;
 
         JTextField textField;
 
         BaseUiObject(int radix) {
             this.radix = radix;
             panel = new JPanel();
             panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
 
             label = new JLabel(this + ":");
             label.setPreferredSize(new Dimension(50, 25));
 
             textField = new JTextField();
             textField.getDocument().addDocumentListener(documentListener);
             ((PlainDocument) textField.getDocument()).setDocumentFilter(documentFilter);
             textField.getDocument().putProperty(PROPERTY_KEY, radix);
 
             panel.add(label);
             panel.add(Box.createHorizontalStrut(Constants.DEFAULT_X_BORDER));
             panel.add(textField);
         }
 
         @Override
         public String toString() {
             switch (radix) {
                 case 2 -> {
                     return BINARY;
                 }
                 case 8 -> {
                     return OCTAL;
                 }
                 case 10 -> {
                     return DECIMAL;
                 }
                 case 16 -> {
                     return HEX;
                 }
                 default -> {
                     return String.valueOf(radix);
                 }
             }
         }
     }
 }