import java.io.*;
import java.util.*;

/*  This class has a method CreateContract that simulates the
 * PDFfusion program that we wer told to use but not given access to
 * It takes a filename for a script as well as the filename for a template
 * and performs mailmerge to merge the script values into the template.
 * When it is finished, it writes the output to a file that has the name out.txt
 * This behavior could easily be modified to write to a particular filename.
 */
public class PDFfusion{
	public static boolean CreateContract(String scriptName, String templateName){
		//System.out.println(scriptName + " " + templateName);


		File script = new File(scriptName);
		File template = new File(templateName);

		if(!script.canRead() || !template.canRead()){
			// maybe write out an error to an error file
			return false;
		}

		// create a HashTable to hold all the tag/value pairs.
		Hashtable myTags = new Hashtable();
		fillHashTable(myTags, script);

		writeContract(myTags, template);
		return true;
	}

	private static void fillHashTable(Hashtable h, File script){
		String line = "";
		BufferedReader br = null;
		try{
			br = new BufferedReader(new FileReader(script));
			while(br.ready()){
				try{
					line = br.readLine();
				}catch(IOException ex){
					// write out some error
					System.err.println(ex.getMessage() + "error in reading from the file.");
					break;
				}

				StringTokenizer st = new StringTokenizer(line, Script.FIELD + Script.ENDFIELD + Script.VAL + Script.ENDVAL);
				// Assume that there are only two values per line.

				/*next two values can be used for debugging*/
				String key = st.nextToken();
				String val = st.nextToken();

				h.put(key, val);
			}
		}catch(Exception e){}
	}

	private static void writeContract(Hashtable h, File template){
		try{
			BufferedReader br = new BufferedReader(new FileReader(template));
			StringTokenizer st;
			PrintWriter pw = new PrintWriter(new FileWriter(CONTRACT_NAME));
			String line;
			String currentToken= "";
			while((line = br.readLine())!=null)
			{
				st = new StringTokenizer(line, " ", true);
				while(st.hasMoreTokens())
				{
					currentToken = st.nextToken();
					if(currentToken.charAt(0) == '<'){
						if(currentToken.charAt(currentToken.length()-1) != '>'){
							pw.print(((String)h.get(currentToken.substring(1,currentToken.length()-2))) + currentToken.charAt(currentToken.length()-1));
						}
						else{
							pw.print(h.get(currentToken.substring(1,currentToken.length()-1)));
						}
					}
					else
						pw.print(currentToken);
				}
				pw.println();
			}
			br.close();
			pw.close();
		}catch(Exception e){}
	}

	private static final String CONTRACT_NAME = WebDocumentDistribution.PATH + "out.txt";
}