/*******************************************************************************
    * Copyhacked (H) 2012-2025.
    * This program and the accompanying materials
    * are made available under no term at all, use it like
    * you want, but share and discuss it
    * every time possible with every body.
    * 
    * Contributors:
    *      ron190 at ymail dot com - initial implementation
   ******************************************************************************/
  package com.jsql.view.swing.terminal;
  
  import com.jsql.util.LogLevelUtil;
  import com.jsql.view.swing.terminal.util.BlockCaret;
  import com.jsql.view.swing.terminal.util.KeyAdapterTerminal;
  import com.jsql.view.swing.util.MediatorHelper;
  import com.jsql.view.swing.util.UiUtil;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  import javax.swing.*;
  import javax.swing.text.BadLocationException;
  import javax.swing.text.Style;
  import javax.swing.text.StyleConstants;
  import java.awt.*;
  import java.awt.event.MouseMotionListener;
  import java.net.MalformedURLException;
  import java.net.URI;
  import java.net.URISyntaxException;
  import java.net.URL;
  import java.util.UUID;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  /**
   * A Terminal completely built from swing text pane.
   */
  public abstract class AbstractExploit extends JTextPane {
      
      private static final Logger LOGGER = LogManager.getRootLogger();
  
      /**
       * True if terminal is processing command.
       */
      private final AtomicBoolean isEdited = new AtomicBoolean(false);
  
      /**
       * Server name or IP to display on prompt.
       */
      private final String host;
  
      /**
       * User and password for database.
       */
      private String[] loginPassword = null;
      private final UUID uuidShell;
      private final String urlShell;
  
      /**
       * Style used for coloring text.
       */
      private final transient Style style = this.addStyle("Necrophagist's next album is 2014.", null);
  
      /**
       * Length of prompt.
       */
      private String prompt = StringUtils.EMPTY;
  
      /**
       * Text to display next caret.
       */
      private final String labelShell;
      
      /**
       * Build a shell instance.
       * @param uuidShell Unique identifier to discriminate beyond multiple opened terminals
       * @param urlShell URL of current shell
       * @param labelShell Type of shell to display on prompt
       */
      protected AbstractExploit(UUID uuidShell, String urlShell, String labelShell) throws MalformedURLException, URISyntaxException {
          this(uuidShell, urlShell, labelShell, true);
      }
      protected AbstractExploit(UUID uuidShell, String urlShell, String labelShell, boolean isAddingPrompt) throws MalformedURLException, URISyntaxException {
          this.uuidShell = uuidShell;
          this.urlShell = urlShell;
          this.labelShell = labelShell;
  
          URL url;
          if (StringUtils.isEmpty(urlShell)) {  // udf
              url = new URI(MediatorHelper.model().getMediatorUtils().getConnectionUtil().getUrlByUser()).toURL();
          } else {
              url = new URI(urlShell).toURL();
          }
          this.host = url.getHost();
  
          this.setFont(new Font(UiUtil.FONT_NAME_MONO_NON_ASIAN, Font.PLAIN, UIManager.getFont("TextArea.font").getSize()));
          this.setCaret(new BlockCaret());
          this.setBackground(Color.BLACK);
          this.setForeground(Color.LIGHT_GRAY);
 
         if (isAddingPrompt) {
             this.displayPrompt(true);
         } else {
             this.append("Waiting for reverse connection...\n");
         }
 
         this.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
         this.setTransferHandler(null);
         this.setHighlighter(null);
 
         this.addMouseListener(new EmptyFocusCopy(this));
         this.addKeyListener(new KeyAdapterTerminal(this));
     }
 
     /**
      * Run when cmd is validated.
      * @param cmd Command to execute
      * @param terminalID Unique ID for terminal instance
      * @param wbhPath URL of shell
      * @param arg Additional parameters (User and password for SQLShell)
      */
     public abstract void action(String cmd, UUID terminalID, String wbhPath, String... arg);
     
     /**
      * Update terminal and use default behavior.
      */
     public void reset() {
         this.reset(true);
     }
     public void reset(boolean isPromptVisible) {
         this.isEdited.set(false);
         this.setEditable(true);
         if (isPromptVisible) {
             this.displayPrompt(false);
         }
         this.setCaretPosition(this.getDocument().getLength());
         this.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
     }
 
     /**
      * Add a text at the end of textpane.
      * @param string Text to add
      */
     public void append(String string) {
         try {
             var doc = this.getDocument();
             doc.insertString(doc.getLength(), string, null);
         } catch (BadLocationException e) {
             LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
         }
     }
     
     /**
      * Append prompt to textpane, measure prompt the first time is used.
      * @param isAddingPrompt Should we measure prompt length?
      */
     public void displayPrompt(boolean isAddingPrompt) {
         StyleConstants.setUnderline(this.style, true);
         this.appendPrompt("jsql", Color.LIGHT_GRAY, isAddingPrompt);
         StyleConstants.setUnderline(this.style, false);
 
         this.appendPrompt(StringUtils.SPACE + this.labelShell, Color.LIGHT_GRAY, isAddingPrompt);
         this.appendPrompt("[", new Color(0x32BF32), isAddingPrompt);
         this.appendPrompt(this.host, new Color(0xBFBF19), isAddingPrompt);
         this.appendPrompt("]", new Color(0x32BF32), isAddingPrompt);
         this.appendPrompt(" >", new Color(0xBF6464), isAddingPrompt);
         this.appendPrompt(StringUtils.SPACE, Color.LIGHT_GRAY, isAddingPrompt);
     }
 
     /**
      * Add a colored string to the textpane, measure prompt at the same time.
      * @param string Text to append
      * @param color Color of text
      * @param isAddingPrompt Should we measure prompt length?
      */
     private void appendPrompt(String string, Color color, boolean isAddingPrompt) {
         try {
             StyleConstants.setForeground(this.style, color);
             this.getStyledDocument().insertString(this.getStyledDocument().getLength(), string, this.style);
             if (isAddingPrompt) {
                 this.prompt += string;
             }
         } catch (BadLocationException e) {
             LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
         }
     }
 
     /**
      * NoWrap.
      */
     @Override
     public boolean getScrollableTracksViewportWidth() {
         return this.getUI().getPreferredSize(this).width <= this.getParent().getSize().width;
     }
 
     /**
      * Cancel every mouse movement processing like drag/drop.
      */
     @Override
     public synchronized void addMouseMotionListener(MouseMotionListener l) {
         // Do nothing
     }
 
     /**
      * Get index of line for current offset (generally cursor position).
      * @param offset Position on the line
      * @return Index of the line
      */
     public int getLineOfOffset(int offset) throws BadLocationException {
         var errorMsg = "Can't translate offset to line";
         var doc = this.getDocument();
         
         if (offset < 0) {
             throw new BadLocationException(errorMsg, -1);
         } else if (offset > doc.getLength()) {
             throw new BadLocationException(errorMsg, doc.getLength() + 1);
         } else {
             var map = doc.getDefaultRootElement();
             return map.getElementIndex(offset);
         }
     }
 
     /**
      * Get position of the beginning of the line.
      * @param line Index of the line
      * @return Offset of line
      */
     public int getLineStartOffset(int line) throws BadLocationException {
         var map = this.getDocument().getDefaultRootElement();
         
         if (line < 0) {
             throw new BadLocationException("Negative line", -1);
         } else if (line >= map.getElementCount()) {
             throw new BadLocationException("No such line", this.getDocument().getLength() + 1);
         } else {
             var lineElem = map.getElement(line);
             return lineElem.getStartOffset();
         }
     }
 
     
     // Getter and setter
     
     public AtomicBoolean getIsEdited() {
         return this.isEdited;
     }
 
     public UUID getUuidShell() {
         return this.uuidShell;
     }
 
     public String getUrlShell() {
         return this.urlShell;
     }
 
     public String getPrompt() {
         return this.prompt;
     }
 
     public String[] getLoginPassword() {
         return this.loginPassword;
     }
 
     public void setLoginPassword(String[] loginPassword) {
         this.loginPassword = loginPassword;
     }
 }