import java.io.*;
import java.util.Vector;
/**
    LetterTemplate a class to hold the template of a letter
**/

public class LetterTemplate extends PersistentObject
{
    String  Body,
            Name,
            tagStart,
            tagEnd;
    int     curpos;
    
	public LetterTemplate( Vector v )
	{
		tagStart = "<<";
		tagEnd = ">>";
		ID = Integer.parseInt( (String) v.elementAt( 0 ) );
		Name = (String) v.elementAt( 1 );
		Body = (String) v.elementAt( 2 );
		curpos = 0;
	}
		
	public LetterTemplate()
	{
		tagStart = "<<";
		tagEnd = ">>";
		ID = -1;
		Name = "";
		Body = "";
		curpos = 0;
	}
    	
	public void update( Vector v )
	{
		ID = Integer.parseInt( (String) v.elementAt( 0 ) );
		Name = (String) v.elementAt( 1 );
		Body = (String) v.elementAt( 2 );
		System.out.println("updating name:" + Name + " body: " + Body);
		curpos = 0;
	}
    
    public String replaceTag( String body, String tag, String replace )
    {
        int pos = searchString( body, tagStart + tag + tagEnd, 0 );
		System.out.println( "replace:" + replace);
		
        if ( pos != -1 )
        {
            String newBody = body.substring( 0, pos ) + replace;
            newBody += body.substring( pos + ( tagStart + tag + tagEnd ).length(), body.length());
			System.out.println( "new Body:" + newBody);
			return newBody;
        }
        return null;
    }

    
    public int searchString( String body, String find, int cp )
    {
		System.out.println("body: " + body + "   find: " + find);
        for ( int i = cp; i < body.length(); i++ )
        {
            int tmp = i, j = 0;
            for ( ; j < find.length(); j++ )
            {
                if ( body.charAt( tmp ) != find.charAt( j ) ) break;
                tmp++;
            }
            if ( j == find.length() ) return i;
        }
        return -1;
    }

    public void setcurpos( int i )
    {
        curpos = i;
    }
	
	public boolean equals( Vector v )
	{
		if ( ( Integer.parseInt( (String) v.elementAt( 0 ) ) ) == ID ) return true;
		return false;
	}
    
    public String getNextTag()
    {
        int pos = searchString( Body, tagStart, curpos );
        if ( pos != -1 ) 
        {
            int endpos = searchString( Body, tagEnd, pos );
            if ( endpos != -1 )
            {
                curpos = endpos + tagEnd.length();
                return Body.substring( pos + tagStart.length(), endpos );
            }
        }
        return null;
    }
    
    public void persist( DataOutputStream file )
    {
        // write the ID
        String temp = Integer.toString( ID );
        writeField( file, temp);
        
        // write the name of the template
        writeField( file, Name );
        
        //write the body of the template
        writeField( file, Body );
    }
    
    public void retrieve( DataInputStream file )
    {
        // read the ID
        String temp = readNextField( file );
        if ( temp == null ) return;
		
		ID = Integer.parseInt( temp );
        
        // read the name of template
        Name = readNextField( file );
        
        // read the body of the template
        Body = readNextField( file );        
    }
	
	public String getName()
	{  return Name;  }
	
	public void setName( String s )
	{  Name = s;  }
	
	public void setBody( String s)
	{  Body = s; }
	
	public String getTemplate()
	{  return new String(Body);  }
}