//******************************************************************************
// problem2.java:	Applet   for MAS962 ps#1
//
// Author: Ingeborg Endter       9/12/97
//******************************************************************************
import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.*;

//==============================================================================
// Main Class for applet problem2
//
//==============================================================================
public class problem2 extends Applet
{
    TextField mInputField;                  //for user input
    Button mTheButton;                      //Button
    TextArea mOutputBox;                    //for output
    //String mFilePath = "D:\\IEROOT\\MLCourses\\MAS962\\PS1\\problem2\\code.txt"; //***** TEST - local
    String mFilePath = "http://acg/mas962/ps1/code.txt";               //***** TEST - for web

    //--------------------------------------------------------------------------
	public void init()
	{
    	resize(540, 382);
        mInputField = new TextField("Type something here",40);
        mTheButton = new Button("Transform it!");
        mOutputBox = new TextArea();

        GridBagConstraints gbc = new GridBagConstraints();
        GridBagLayout gridbag = new GridBagLayout();
        setLayout(gridbag);

        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridwidth = GridBagConstraints.REMAINDER;

        gridbag.setConstraints(mInputField, gbc);
        add(mInputField);

        gbc.anchor = GridBagConstraints.CENTER;
        gbc.fill = GridBagConstraints.VERTICAL;

        gridbag.setConstraints(mTheButton, gbc);
        add(mTheButton);

        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        gbc.fill = GridBagConstraints.BOTH;
        gridbag.setConstraints(mOutputBox, gbc);
        add(mOutputBox);
    }

    
    //--------------------------------------------------------------------------
    public boolean action (Event event, Object obj) 
    {
    // when the button is clicked
        if (event.target == mTheButton) 
        {
            String someInput; 
            String replacement;
            StringBuffer someOutput = new StringBuffer(); 
            char tempChar;

            try
            {
             // get the user's input from the TextField
                someInput = mInputField.getText();
                int length = someInput.length();

             // read the user's input a char at a time, then search the codes file
             // for the replacement text
                for (int i=0; i<length; i++)
                {
                    tempChar = someInput.charAt(i);
                    if (tempChar >= 'A' && tempChar <= 'z')
                    {
                        replacement = SearchStream(mFilePath, tempChar);
                        someOutput.append(replacement);
                    }
                    else 
                    {   someOutput.append(' '); }
                }
            }
            catch (StringIndexOutOfBoundsException e) { System.err.println(e); }
            
            mOutputBox.setText(TextWrap(someOutput.toString(),50));
            return true;        
        }          
        return false;      
    }


    //****** 
    //       SearchStream: searches a file at some URL, which contains lines
    //       consisting of a "key" (a character) and its replacement (a string). 
    //       The method reads the file a line at a time, searching the keys,
    //       and returns the replacement string if a match is found.
    //******
    public String SearchStream(String inFile, char ch)
    {
        String testString,
               returnString;
        int keyIndex = 0;          //the key is at this index
        int replaceIndex = 2;      //the replacement string is at this index
        URL webFile;           //***** TEST - for web
        DataInputStream inStream;

		try 
        {
           webFile = new URL(inFile);     //***** TEST - for web
           inStream = new DataInputStream(webFile.openStream());  //***** TEST - for web
           //inStream = new DataInputStream(new FileInputStream(inFile));   //***** TEST - local
           testString = inStream.readLine();      //read first line
           while (testString != null)
           {                
                if (testString.charAt(keyIndex) == Character.toLowerCase(ch)) 
                {
                    returnString = testString.substring(replaceIndex);
                    inStream.close();
                    return returnString;
                }
                testString = inStream.readLine();
            }
            
            //if we got here, the substring was not found
            System.out.println("Substring not found");
            inStream.close();
		}
        catch (MalformedURLException e) { System.err.println(e); }
        catch (IOException e) { System.err.println(e); }
        catch (StringIndexOutOfBoundsException e) { System.err.println(e); }

        return null;
    }


    //****** 
    //       TextWrap: wraps text in a text area.
    //       Input: a String and the size of the line in characters
    //       Output: the formatted string
    //******
    public String TextWrap(String inString, int lineSize)
    {
        String outString = "";    //initialize the string
        int numChars = inString.length();
        char tempChar;
        int charCount = 0;

        try
        { 
            for (int i=0; i< numChars; i++)
            {
                tempChar = inString.charAt(i);
                if (tempChar == '\n') charCount = 0;  //reset counter at each newline
                else charCount++;
                if (charCount % lineSize == 0) outString = outString + '\n';
                outString = outString + tempChar;
            }
        }
        catch (StringIndexOutOfBoundsException e) { System.err.println(e); }
        return outString;
    }            

} //end class problem2