/* PhrasesCompiler.java 
 *
 * (c) 2005 fnh
 */

import java.io.*;


/**
 * read a text file with one-line phrases and create the upper/lower 
 * ROM (read-only memory) initialization files suitable for the
 * TextLCD demonstration.
 * We assume a display with 2 lines of 40 characters each: the phrases
 * or jokes should be less than 80 characters (or rather less than 70
 * characters due to the 2-char indent and the line-breaking algorithm).
 * <p>
 * Specify the input filename as the first argument to this class;
 * the two output files have the hardcoded names 'phrases-upper.rom'
 * and 'phrases-lower.rom'
 * <p>
 */
class PhrasesCompiler {
  FileInputStream infile = null;
  PrintStream      upper = null;
  PrintStream      lower = null;
  int               addr = 0;

  
  public PhrasesCompiler() {
    // empty
  }


  public void parse( String filename ) throws Exception 
  {
    infile = new FileInputStream( filename ); 
    upper  = new PrintStream( new FileOutputStream( "phrases-upper.rom" ));
    lower  = new PrintStream( new FileOutputStream( "phrases-lower.rom" ));

    displayInit();

    BufferedReader br = new BufferedReader( new InputStreamReader( infile ));
    String line = null;
    while( (line=br.readLine()) != null ) {
      msg( "-#- '" + line + "'" );
      if (line.length() == 0) continue;    // empty line
      if (line.charAt(0) == '#') continue; // comment line
      displayCursorHome();
      tokenizeLine( line );
    }
    restOfRom();

    upper.close();
    lower.close();
    infile.close();
  }


  /**
   * try to find a suitable line break for a display with two rows of 80
   * columns (characters) each.
   */
  public void tokenizeLine( String line ) {
    int n = line.length();
    int x = n-1;
    for( int i=Math.min(x,39); i >= 0; i-- ) {
      char c = line.charAt(i);
      if ((c == ' ') || (c == ',') || (c == ':')) {
        x = i; break;
      }
    }

    String line1 = line.substring(0,x);
    String line2 = " " + line.substring(x,n);

// some debug output 
// msg( "    '" + line1 + "'" );
// msg( "    '" + line2 + "'" );
// msg( "" );

    for( int i=0,m=line1.length(); i < m; i++ ) {
      displayOneChar( line1.charAt(i) );
    }
    displayNewLine();
    for( int i=0,m=line2.length(); i < Math.min(m,40); i++ ) {
      displayOneChar( line2.charAt(i) );
    }
    displayPause();
  }


  public void restOfRom() {
    int rom_size = 8192; // 8K hardcoded
    for( int a = addr; a < rom_size; a++ ) {
      _write( 0, 0x0f ); // cursor-on: a NOP here
    }

  }

  public void displayInit() {
    _write( 0, 0x38 ); // reset
    _write( 0, 0x3c ); // reset: 8-bit two-lines
    _write( 0, 0x0f ); // display-on cursonr on
    _write( 0, 0x01 ); // clear display
    _write( 0, 0x80 ); // data addr 0
  }


  public void displayCursorHome() {
    _write( 0, 0x01 ); // clear display
    _write( 0, 0x03 ); // cursor home // cursor home
    _write( 0, 0x80 ); // data addr 0
  }


  public void displayNewLine() {
    _write( 0, 0xc0 ); // data addr 64 (first char, second line)
  }


  public void displayOneChar( char c ) {
    _write( 2, c );
  }



  public void displayPause() {
    for( int i=0; i < 20; i++ ) {
      _write( 0, 0x0f ); // display-on curson-on ...
    }
  }


  public void _write( int uval, int lval) {
    upper.println( _hex4( addr ) + ":" + _hex2( uval ));
    lower.println( _hex4( addr ) + ":" + _hex2( lval ));
    addr ++;
  }


  public String _hex2( int val ) {
    if ((val > 255) || (val < 0)) return "XX";
    if (val > 15) return Integer.toHexString( val );
    else          return "0" + Integer.toHexString( val );
  }


  public String _hex4( int addr ) {
    if ((addr > 65535) || (addr < 0)) return "XXXX";
    if (addr > 4095) return Integer.toHexString( addr );
    if (addr > 255) return "0" + Integer.toHexString( addr );
    if (addr > 15) return "00" + Integer.toHexString( addr );
    else          return "000" + Integer.toHexString( addr );
  }


  public static void usage() {
    System.out.println( 
      "Usage: java PhrasesCompiler <inputfilename>\n"
    + "this parses the given input file and creates the two ROM\n"
    + "initialization data files 'phrases-upper.rom' and 'phrases-lower.rom'\n"
    + "Example:\n"
    + "java PhrasesCompiler mybestjokes.txt\n"
    + "java hades.gui.Editor -file phrases.hds\n"
    );
    System.exit(1);
  }


  public static void msg( String s ) {
    System.out.println( s );
  }


  public static void main( String args[] ) throws Exception {
    try {
      PhrasesCompiler gcc = new PhrasesCompiler();
      gcc.parse( args[0] );
    }
    catch( Exception e ) {
      msg( "-E- got an exception: " + e );
      e.printStackTrace();
      usage();
    }
  }

}