///////////////////////////////////////////////////////////////////////////////////////////////
   // checkstyle: Checks Java source code and other text files for adherence to a set of rules.
   // Copyright (C) 2001-2025 the original author or authors.
   //
   // This library is free software; you can redistribute it and/or
   // modify it under the terms of the GNU Lesser General Public
   // License as published by the Free Software Foundation; either
   // version 2.1 of the License, or (at your option) any later version.
   //
  // This library 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
  // Lesser General Public License for more details.
  //
  // You should have received a copy of the GNU Lesser General Public
  // License along with this library; if not, write to the Free Software
  // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  ///////////////////////////////////////////////////////////////////////////////////////////////
  
  package com.puppycrawl.tools.checkstyle.gui;
  
  import java.awt.Component;
  import java.awt.Dimension;
  import java.awt.FontMetrics;
  import java.awt.event.ActionEvent;
  import java.awt.event.MouseAdapter;
  import java.awt.event.MouseEvent;
  import java.io.Serial;
  import java.util.ArrayDeque;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Deque;
  import java.util.EventObject;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import javax.swing.AbstractAction;
  import javax.swing.Action;
  import javax.swing.JTable;
  import javax.swing.JTextArea;
  import javax.swing.JTree;
  import javax.swing.KeyStroke;
  import javax.swing.LookAndFeel;
  import javax.swing.table.TableCellEditor;
  import javax.swing.tree.TreePath;
  
  import com.puppycrawl.tools.checkstyle.api.DetailAST;
  import com.puppycrawl.tools.checkstyle.utils.XpathUtil;
  import com.puppycrawl.tools.checkstyle.xpath.ElementNode;
  import com.puppycrawl.tools.checkstyle.xpath.RootNode;
  import com.puppycrawl.tools.checkstyle.xpath.XpathQueryGenerator;
  import net.sf.saxon.trans.XPathException;
  
  /**
   * This example shows how to create a simple TreeTable component,
   * by using a JTree as a renderer (and editor) for the cells in a
   * particular column in the JTable.
   * <a href=
   * "https://docs.oracle.com/cd/E48246_01/apirefs.1111/e13403/oracle/ide/controls/TreeTableModel.html">
   * Original&nbsp;Source&nbsp;Location</a>
   *
   * @noinspection ThisEscapedInObjectConstruction
   * @noinspectionreason ThisEscapedInObjectConstruction - only reference is used and not
   *      accessed until initialized
   */
  public final class TreeTable extends JTable {
  
      /** A unique serial version identifier. */
      @Serial
      private static final long serialVersionUID = -8493693409423365387L;
      /** The newline character. */
      private static final String NEWLINE = "\n";
      /** A subclass of JTree. */
      private final TreeTableCellRenderer tree;
      /** JTextArea editor. */
      private JTextArea editor;
      /** JTextArea xpathEditor. */
      private JTextArea xpathEditor;
      /** Line position map. */
      private List<Integer> linePositionList;
  
      /**
       * Creates TreeTable base on TreeTableModel.
       *
       * @param treeTableModel Tree table model
       */
      public TreeTable(ParseTreeTableModel treeTableModel) {
          // Create the tree. It will be used as a renderer and editor.
          tree = new TreeTableCellRenderer(this, treeTableModel);
  
          // Install a tableModel representing the visible rows in the tree.
          setModel(new TreeTableModelAdapter(treeTableModel, tree));
  
          // Force the JTable and JTree to share their row selection models.
          final ListToTreeSelectionModelWrapper selectionWrapper = new
                  ListToTreeSelectionModelWrapper(this);
          tree.setSelectionModel(selectionWrapper);
          setSelectionModel(selectionWrapper.getListSelectionModel());
  
         // Install the tree editor renderer and editor.
         setDefaultRenderer(ParseTreeTableModel.class, tree);
         setDefaultEditor(ParseTreeTableModel.class, new TreeTableCellEditor());
 
         // No grid.
         setShowGrid(false);
 
         // No intercell spacing
         setIntercellSpacing(new Dimension(0, 0));
 
         // And update the height of the trees row to match that of
         // the table.
         if (tree.getRowHeight() < 1) {
             // Metal looks better like this.
             final int height = getRowHeight();
             setRowHeight(height);
         }
 
         setColumnsInitialWidth();
 
         final Action expand = new AbstractAction() {
             @Serial
             private static final long serialVersionUID = -5859674518660156121L;
 
             @Override
             public void actionPerformed(ActionEvent event) {
                 expandSelectedNode();
             }
         };
         final KeyStroke stroke = KeyStroke.getKeyStroke("ENTER");
         final String command = "expand/collapse";
         getInputMap().put(stroke, command);
         getActionMap().put(command, expand);
 
         addMouseListener(new MouseAdapter() {
             @Override
             public void mouseClicked(MouseEvent event) {
                 if (event.getClickCount() == 2) {
                     expandSelectedNode();
                 }
             }
         });
     }
 
     /**
      * Do expansion of a tree node.
      */
     private void expandSelectedNode() {
         final TreePath selected = tree.getSelectionPath();
         makeCodeSelection();
         generateXpath();
 
         if (tree.isExpanded(selected)) {
             tree.collapsePath(selected);
         }
         else {
             tree.expandPath(selected);
         }
         tree.setSelectionPath(selected);
     }
 
     /**
      * Make selection of code in a text area.
      */
     private void makeCodeSelection() {
         new CodeSelector(tree.getLastSelectedPathComponent(), editor, linePositionList).select();
     }
 
     /**
      * Generate Xpath.
      */
     private void generateXpath() {
         if (tree.getLastSelectedPathComponent() instanceof DetailAST ast) {
             final String xpath = XpathQueryGenerator.generateXpathQuery(ast);
             xpathEditor.setText(xpath);
         }
         else {
             xpathEditor.setText("Xpath is not supported yet for javadoc nodes");
         }
     }
 
     /**
      * Set initial value of width for columns in table.
      */
     private void setColumnsInitialWidth() {
         final FontMetrics fontMetrics = getFontMetrics(getFont());
         // Six character string to contain "Column" column.
         final int widthOfSixCharacterString = fontMetrics.stringWidth("XXXXXX");
         // Padding must be added to width for columns to make them fully
         // visible in table header.
         final int padding = 10;
         final int widthOfColumnContainingSixCharacterString =
                 widthOfSixCharacterString + padding;
         getColumn("Line").setMaxWidth(widthOfColumnContainingSixCharacterString);
         getColumn("Column").setMaxWidth(widthOfColumnContainingSixCharacterString);
         final int preferredTreeColumnWidth =
                 Math.toIntExact(Math.round(getPreferredSize().getWidth() * 0.6));
         getColumn("Tree").setPreferredWidth(preferredTreeColumnWidth);
         // Twenty-eight character string to contain "Type" column
         final int widthOfTwentyEightCharacterString =
                 fontMetrics.stringWidth("XXXXXXXXXXXXXXXXXXXXXXXXXXXX");
         final int preferredTypeColumnWidth = widthOfTwentyEightCharacterString + padding;
         getColumn("Type").setPreferredWidth(preferredTypeColumnWidth);
     }
 
     /**
      * Select Node by Xpath.
      */
     public void selectNodeByXpath() {
         final DetailAST rootAST = (DetailAST) tree.getModel().getRoot();
         if (rootAST.hasChildren()) {
             final String xpath = xpathEditor.getText();
 
             try {
                 final Deque<DetailAST> nodes =
                         XpathUtil.getXpathItems(xpath, new RootNode(rootAST))
                               .stream()
                               .map(ElementNode.class::cast)
                               .map(ElementNode::getUnderlyingNode)
                               .collect(Collectors.toCollection(ArrayDeque::new));
                 updateTreeTable(xpath, nodes);
             }
             catch (XPathException exception) {
                 xpathEditor.setText(xpathEditor.getText() + NEWLINE + exception.getMessage());
             }
         }
         else {
             xpathEditor.setText("No file Opened");
         }
     }
 
     /**
      * Updates the Treetable by expanding paths in the tree and highlighting
      * associated code.
      *
      * @param xpath the XPath query to show in case of no match
      * @param nodes the deque of DetailAST nodes to match in TreeTable and XPath editor
      */
     private void updateTreeTable(String xpath, Deque<DetailAST> nodes) {
         if (nodes.isEmpty()) {
             xpathEditor.setText("No elements matching XPath query '"
                     + xpath + "' found.");
         }
         else {
             for (DetailAST node : nodes) {
                 expandTreeTableByPath(node);
                 makeCodeSelection();
             }
             xpathEditor.setText(getAllMatchingXpathQueriesText(nodes));
         }
     }
 
     /**
      * Expands path in tree table to given node so that user can
      * see the node.
      *
      * @param node node to expand table by
      */
     private void expandTreeTableByPath(DetailAST node) {
         TreePath path = new TreePath(node);
         path = path.pathByAddingChild(node);
         if (!tree.isExpanded(path)) {
             tree.expandPath(path);
         }
         tree.setSelectionPath(path);
     }
 
     /**
      * Generates a String with all matching XPath queries separated
      * by newlines.
      *
      * @param nodes deque of nodes to generate queries for
      * @return complete text of all XPath expressions separated by newlines.
      */
     private static String getAllMatchingXpathQueriesText(Deque<DetailAST> nodes) {
         return nodes.stream()
                 .map(XpathQueryGenerator::generateXpathQuery)
                 .collect(Collectors.joining(NEWLINE, "", NEWLINE));
     }
 
     /**
      * Overridden to message super and forward the method to the tree.
      * Since the tree is not actually in the component hierarchy it will
      * never receive this unless we forward it in this manner.
      */
     @Override
     public void updateUI() {
         super.updateUI();
         if (tree != null) {
             tree.updateUI();
         }
         // Use the tree's default foreground and background colors in the
         // table.
         LookAndFeel.installColorsAndFont(this, "Tree.background",
                 "Tree.foreground", "Tree.font");
     }
 
     /* Workaround for BasicTableUI anomaly. Make sure the UI never tries to
      * paint the editor. The UI currently uses different techniques to
      * paint the renderers and editors and overriding setBounds() below
      * is not the right thing to do for an editor. Returning -1 for the
      * editing row in this case, ensures the editor is never painted.
      */
     @Override
     public int getEditingRow() {
         int rowIndex = -1;
         final Class<?> editingClass = getColumnClass(editingColumn);
         if (editingClass != ParseTreeTableModel.class) {
             rowIndex = editingRow;
         }
         return rowIndex;
     }
 
     /**
      * Overridden to pass the new rowHeight to the tree.
      */
     @Override
     public void setRowHeight(int newRowHeight) {
         super.setRowHeight(newRowHeight);
         if (tree != null && tree.getRowHeight() != newRowHeight) {
             tree.setRowHeight(getRowHeight());
         }
     }
 
     /**
      * Returns tree.
      *
      * @return the tree that is being shared between the model.
      */
     public JTree getTree() {
         return tree;
     }
 
     /**
      * Sets text area editor.
      *
      * @param textArea JTextArea component.
      */
     public void setEditor(JTextArea textArea) {
         editor = textArea;
     }
 
     /**
      * Sets text area xpathEditor.
      *
      * @param xpathTextArea JTextArea component.
      */
     public void setXpathEditor(JTextArea xpathTextArea) {
         xpathEditor = xpathTextArea;
     }
 
     /**
      * Sets line positions.
      *
      * @param linePositionList positions of lines.
      */
     public void setLinePositionList(Collection<Integer> linePositionList) {
         this.linePositionList = new ArrayList<>(linePositionList);
     }
 
     /**
      * TreeTableCellEditor implementation. Component returned is the
      * JTree.
      */
     private final class TreeTableCellEditor extends BaseCellEditor implements
             TableCellEditor {
 
         @Override
         public Component getTableCellEditorComponent(JTable table,
                 Object value,
                 boolean isSelected,
                 int row, int column) {
             return tree;
         }
 
         /**
          * Overridden to return false, and if the event is a mouse event
          * it is forwarded to the tree.
          *
          * <p>The behavior for this is debatable, and should really be offered
          * as a property. By returning false, all keyboard actions are
          * implemented in terms of the table. By returning true, the
          * tree would get a chance to do something with the keyboard
          * events. For the most part this is ok. But for certain keys,
          * such as left/right, the tree will expand/collapse where as
          * the table focus should really move to a different column. Page
          * up/down should also be implemented in terms of the table.
          * By returning false this also has the added benefit that clicking
          * outside of the bounds of the tree node, but still in the tree
          * column will select the row, whereas if this returned true
          * that wouldn't be the case.
          *
          * <p>By returning false we are also enforcing the policy that
          * the tree will never be editable (at least by a key sequence).
          *
          * @see TableCellEditor
          */
         @Override
         public boolean isCellEditable(EventObject event) {
             if (event instanceof MouseEvent mouseEvent) {
                 for (int counter = getColumnCount() - 1; counter >= 0;
                      counter--) {
                     if (getColumnClass(counter) == ParseTreeTableModel.class) {
                         final MouseEvent newMouseEvent = new MouseEvent(tree, mouseEvent.getID(),
                                 mouseEvent.getWhen(), mouseEvent.getModifiersEx(),
                                 mouseEvent.getX() - getCellRect(0, counter, true).x,
                                 mouseEvent.getY(), mouseEvent.getClickCount(),
                                 mouseEvent.isPopupTrigger());
                         tree.dispatchEvent(newMouseEvent);
                         break;
                     }
                 }
             }
 
             return false;
         }
 
     }
 
 }