import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
import javax.swing.text.*;


// might be nice to have option to save this to a file

// debugging this class is tricky.. if it's throwing 
// exceptions, don't take over System.err, and debug 
// while watching just System.out
// or just write directly to systemOut or systemErr

public class PdeEditorConsole extends JScrollPane {
  PdeEditor editor;

  StyledDocument consoleDoc;
  MutableAttributeSet stdStyle;
  MutableAttributeSet errStyle;

/* for potential cross platform whitespace munging  
  static final byte CR  = (byte)'\r';
  static final byte LF  = (byte)'\n';
  static final byte TAB = (byte)'\t';
  static final int TAB_SIZE = 2;
*/

  boolean cerror;

  //static final int HINSET = 6;
  //static final int VINSET = 6;

  static PrintStream systemOut;
  static PrintStream systemErr;

  static PrintStream consoleOut;
  static PrintStream consoleErr;

  static OutputStream stdoutFile;
  static OutputStream stderrFile;


  public PdeEditorConsole(PdeEditor editor) {
    this.editor = editor;

    JTextPane consoleTextPane = new JTextPane();
    consoleTextPane.setEditable(false);
    consoleDoc = consoleTextPane.getStyledDocument();

    // necessary?
    MutableAttributeSet standard = new SimpleAttributeSet();
    StyleConstants.setAlignment(standard, StyleConstants.ALIGN_LEFT);
    consoleDoc.setParagraphAttributes(0, 0, standard, true);
    
    // build styles for different types of console output
    Color bgColor = PdeBase.getColor("editor.console.bgcolor", 
                      new Color(26, 26, 26));
    Color fgColorOut = PdeBase.getColor("editor.console.fgcolor.output", 
                         new Color(153, 153, 153));
    Color fgColorErr = PdeBase.getColor("editor.console.fgcolor.error", 
                         new Color(204, 51, 0));
    Font font = PdeBase.getFont("editor.console.font", 
                  new Font("Monospaced", Font.PLAIN, 11));

    stdStyle = new SimpleAttributeSet();
    StyleConstants.setForeground(stdStyle, fgColorOut);
    StyleConstants.setBackground(stdStyle, bgColor);
    StyleConstants.setFontSize(stdStyle, font.getSize());
    StyleConstants.setFontFamily(stdStyle, font.getFamily());
    StyleConstants.setBold(stdStyle, font.isBold());
    StyleConstants.setItalic(stdStyle, font.isItalic());
    
    errStyle = new SimpleAttributeSet();
    StyleConstants.setForeground(errStyle, fgColorErr);
    StyleConstants.setBackground(errStyle, bgColor);
    StyleConstants.setFontSize(errStyle, font.getSize());
    StyleConstants.setFontFamily(errStyle, font.getFamily());
    StyleConstants.setBold(errStyle, font.isBold());
    StyleConstants.setItalic(errStyle, font.isItalic());

    consoleTextPane.setBackground(bgColor);
        
    // add the jtextpane to this scrollpane
    this.setViewportView(consoleTextPane);

    // todo: don't think this does anything
    //XXX the initial size should be from properties file
    this.setPreferredSize(new Dimension(200, 50));

    if (systemOut == null) {
      systemOut = System.out;
      systemErr = System.err;

      // no text thing on macos
      boolean tod = ((PdeBase.platform != PdeBase.MACOSX) &&
		     (PdeBase.platform != PdeBase.MACOS9));

      if (PdeBase.getBoolean("editor.console.out.enabled", tod)) {
	String outFileName = 
	  PdeBase.get("editor.console.out.file", "lib/stdout.txt");
	try {
	  stdoutFile = new FileOutputStream(outFileName);
	} catch (IOException e) {
	  e.printStackTrace();
	}
      }

      if (PdeBase.getBoolean("editor.console.err.enabled", tod)) {
	String errFileName = 
	  PdeBase.get("editor.console.err.file", "lib/stderr.txt");
	try {
	  stderrFile = new FileOutputStream(errFileName);
	} catch (IOException e) {
	  e.printStackTrace();
	}
      }

      consoleOut = 
	new PrintStream(new PdeEditorConsoleStream(this, false, stdoutFile));
      consoleErr = 
	new PrintStream(new PdeEditorConsoleStream(this, true, stderrFile));

      if (PdeBase.getBoolean("editor.console.enabled", true)) {
	System.setOut(consoleOut);
	System.setErr(consoleErr);
      }
    }
  }


  public void write(byte b[], int offset, int length, boolean err) {

//    synchronized (cerror) { // has to be an object...
      if (err != cerror) {
	// advance the line because switching between err/out streams
	// potentially, could check whether we're already on a new line
        message("", cerror, true);
  }

      // we could do some cross platform CR/LF mangling here before outputting
      
      // add text to output document
      message(new String(b, offset, length), err, false);
      // set last error state
      cerror = err;
//    }
  }


  public void message(String what, boolean err, boolean advance) {
    // under osx, suppress the spew about the serial port
    // to avoid an error every time someone loads their app
    if (PdeBase.platform == PdeBase.MACOSX) {
      if (what.equals("Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no SolarisSerialParallel in java.library.path")) return;
      if (what.equals("Caught java.lang.UnsatisfiedLinkError: readRegistrySerial while loading driver com.sun.comm.SolarisDriver")) return;
    }

    // to console display
    appendText(what, err);
    
    if (err) {
      systemErr.print(what);
    } else {
      systemOut.print(what);
    }

    if (advance) {
      appendText("\n", err);
      if (err) {
	systemErr.println();
      } else {
	systemOut.println();
      }
    }
  }

  private void appendText(String text, boolean err)
  {
    try {
      consoleDoc.insertString(consoleDoc.getLength(), text, err ? errStyle : stdStyle);
    }
    catch(Exception e) {}
    }

  public Dimension getPreferredSize() {
    return getMinimumSize();
  }

  public Dimension getMinimumSize() {
    return new Dimension(600, PdeEditor.GRID_SIZE * 3);
  }

  public Dimension getMaximumSize() {
    return new Dimension(3000, PdeEditor.GRID_SIZE * 3);    
}

  
}

class PdeEditorConsoleStream extends OutputStream {
  PdeEditorConsole parent;
  boolean err; // whether stderr or stdout
  byte single[] = new byte[1];
  OutputStream echo;

  public PdeEditorConsoleStream(PdeEditorConsole parent, 
				boolean err, OutputStream echo) {
    this.parent = parent;
    this.err = err;
    this.echo = echo;
  }

  public void close() { }

  public void flush() { }

  public void write(byte b[]) {  // appears never to be used
    parent.write(b, 0, b.length, err);
    if (echo != null) {
      try {
	echo.write(b); //, 0, b.length);
	echo.flush();
      } catch (IOException e) {
	e.printStackTrace();
	echo = null;
      }
    }
  }

  public void write(byte b[], int offset, int length) {
    parent.write(b, offset, length, err);
    if (echo != null) {
      try {
	echo.write(b, offset, length);
	echo.flush();
      } catch (IOException e) {
	e.printStackTrace();
	echo = null;
      }
    }
    /*
    //System.out.println("leech2:");
    if (length >= 1) {
      int lastchar = b[offset + length - 1];
      if (lastchar == '\r') {
	length--;
      } else if (lastchar == '\n') {
	if (length >= 2) {
	  int secondtolastchar = b[offset + length - 2];
	  if (secondtolastchar == '\r') {
	    length -= 2;
	  } else { 
	    length--;
	  }
	} else {
	  length--;
	}
      }
      //if ((lastchar = '\r') || (lastchar == '\n')) length--;
    }
    //if (b[offset + length - 1] == '\r'
    parent.message("2: " + length + " " + new String(b, offset, length), err);
    */
  }

  public void write(int b) {
    single[0] = (byte)b;
    parent.write(single, 0, 1, err);
    if (echo != null) {
      try {
	echo.write(b);
	echo.flush();
      } catch (IOException e) {
	e.printStackTrace();
	echo = null;
      }
    }
    //parent.message(String.valueOf((char)b), err);
  }
}