import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class BCApplet extends Applet 
                implements ActionListener {

    TextField textField, chkField;
    TextArea display, bcode;
    String newLine;
    String bc[] = new String[128];
    int cksum, ck2sum;

    public void init() {

	// initialize Bar Code array bc[]
	bc[1]  = "212222 ";
	bc[2]  = "222122 ";
	bc[3]  = "222221 ";
	bc[4]  = "121223 ";
	bc[5]  = "121322 ";
	bc[6]  = "131222 ";
	bc[7]  = "122213 ";
	bc[8]  = "122312 ";
	bc[9]  = "132212 ";
	bc[10] = "221213 ";
	bc[11] = "221312 ";
	bc[12] = "231212 ";
	bc[13] = "112232 ";
	bc[14] = "122132 ";
	bc[15] = "112232 ";
	bc[16] = "113222 ";
	bc[17] = "123122 ";
	bc[18] = "123221 ";
	bc[19] = "223211 ";
	bc[20] = "221132 ";
	bc[21] = "221231 ";
	bc[22] = "213212 ";
	bc[23] = "223112 ";
	bc[24] = "312131 ";
	bc[25] = "311222 ";
	bc[26] = "321122 ";
	bc[27] = "321221 ";
	bc[28] = "312212 ";
	bc[29] = "322112 ";
	bc[30] = "322211 ";
	bc[31] = "212123 ";
	bc[32] = "212321 ";
	bc[33] = "232121 ";
	bc[34] = "111323 ";
	bc[35] = "131123 ";
	bc[36] = "131321 ";
	bc[37] = "112313 ";
	bc[38] = "132113 ";
	bc[39] = "132311 ";
	bc[40] = "211313 ";
	bc[41] = "231113 ";
	bc[42] = "231311 ";
	bc[43] = "112133 ";
	bc[44] = "112331 ";
	bc[45] = "132131 ";
	bc[46] = "113123 ";
	bc[47] = "113321 ";
	bc[48] = "133121 ";
	bc[49] = "313121 ";
	bc[50] = "211331 ";
	bc[51] = "231131 ";
	bc[52] = "213113 ";
	bc[53] = "213311 ";
	bc[54] = "213131 ";
	bc[55] = "311123 ";
	bc[56] = "311321 ";
	bc[57] = "331121 ";
	bc[58] = "312113 ";
	bc[59] = "312311 ";
	bc[60] = "332111 ";
	bc[61] = "314111 ";
	bc[62] = "221411 ";
	bc[63] = "431111 ";
	bc[64] = "111224 ";
	bc[65] = "111422 ";
	bc[66] = "121124 ";
	bc[67] = "121421 ";
	bc[68] = "141122 ";
	bc[69] = "141221 ";
	bc[70] = "112214 ";
	bc[71] = "112412 ";
	bc[72] = "122114 ";
	bc[73] = "122411 ";
	bc[74] = "142112 ";
	bc[75] = "142211 ";
	bc[76] = "241211 ";
	bc[77] = "221114 ";
	bc[78] = "413111 ";
	bc[79] = "241112 ";
	bc[80] = "134111 ";
	bc[81] = "111242 ";
	bc[82] = "121142 ";
	bc[83] = "121241 ";
	bc[84] = "114212 ";
	bc[85] = "124112 ";
	bc[86] = "124211 ";
	bc[87] = "411212 ";
	bc[88] = "421112 ";
	bc[89] = "421211 ";
	bc[90] = "212141 ";
	bc[91] = "214121 ";
	bc[92] = "412121 ";
	bc[93] = "111143 ";
	bc[94] = "111341 ";
	bc[95] = "131141 ";
	bc[96] = "114113 ";
	bc[97] = "114311 ";
	bc[98] = "411113 ";
	bc[99] = "411311 ";
	bc[100]= "113141 ";
	bc[101]= "114131 ";
	bc[102]= "311141 ";
	bc[103]= "411131 ";
	bc[104]= "211412 ";
	bc[105]= "211214 ";  // Start Code B
	bc[106]= "211232 ";  // 
	bc[107]= "2331112";  // Stop

	// set up graphics
        setLayout(new BorderLayout());
	setBackground(Color.cyan);

       	Panel p1 = new Panel();

	// Add -> BarCode Button to panel
	startButton = new Button("-> BarCode");
	startButton.setBackground(Color.white);
	startButton.addActionListener(new StartListener());
	p1.add(startButton);

	// Add -> ASCII Button to panel
	start2Button = new Button("-> ASCII");
	start2Button.setBackground(Color.white);
	start2Button.addActionListener(new Start2Listener());
	p1.add(start2Button);

	// Add Stop Button to panel
	stopButton = new Button("Stop");
	stopButton.setBackground(Color.white);
       	stopButton.addActionListener(new StopListener());
	p1.add(stopButton);

	// Add Clear Button to panel
	clearButton = new Button("Clear");
	clearButton.setBackground(Color.white);
	clearButton.addActionListener(new ClearListener());
	p1.add(clearButton);

	// Add Test Button to panel
	testButton = new Button("Test");
	testButton.setBackground(Color.white);
	testButton.addActionListener(new TestListener());
	p1.add(testButton);

	// Add checksum label to panel
	chksumLabel = new Label("    Check Sum");
	chksumLabel.setForeground(Color.black);
	p1.add(chksumLabel);

	// Add checksum display to panel
	chkField = new TextField(8);
	chkField.setForeground(Color.black);
	chkField.setBackground(Color.lightGray);
	chkField.setEditable(false);
	p1.add(chkField);

	// define text areas
	textField = new TextField(40);
	display = new TextArea(20, 30);
	bcode = new TextArea(20, 70);

	textField.setBackground(Color.white);
	display.setBackground(Color.lightGray);
	bcode.setBackground(Color.lightGray);
	display.setEditable(false);
	bcode.setEditable(false);

	// use GridBagLAyout in Applet
	GridBagLayout gridBag = new GridBagLayout();
	setLayout(gridBag);
	GridBagConstraints c = new GridBagConstraints();

	// format panel and add to Applet
	c.gridwidth = GridBagConstraints.REMAINDER;
	c.fill = GridBagConstraints.HORIZONTAL;
	gridBag.setConstraints(p1, c);
	add(p1);

	// format textfield and add to Applet
	c.gridwidth = GridBagConstraints.REMAINDER;
	c.fill = GridBagConstraints.HORIZONTAL;
	gridBag.setConstraints(textField, c);
	add(textField);

	// format left display (display) and add to Applet
       	c.gridwidth = GridBagConstraints.RELATIVE;
       	c.fill = GridBagConstraints.NONE;
	c.anchor = GridBagConstraints.WEST;
	gridBag.setConstraints(display, c);
	add(display);

	// format right display (bcode) and to Applet
	c.gridwidth = GridBagConstraints.REMAINDER;
	c.fill = GridBagConstraints.NONE;
	c.anchor = GridBagConstraints.EAST;
	gridBag.setConstraints(bcode, c);
	add(bcode);


	// start applet

	textField.addActionListener(this);
	newLine = System.getProperty("line.separator");

    }

    class StartListener implements ActionListener {
	public void actionPerformed(ActionEvent evt) {
    	    startButton.setEnabled(false);
    	    start2Button.setEnabled(false);
    	    stopButton.setEnabled(true);
    	    clearButton.setEnabled(true);
    	    testButton.setEnabled(true);
	    String tLine = textField.getText();
	    int value = 104;
	    String bLine = bc[value+1]; // start code = 104
	    int i = 0;
	    cksum = 104;
 	    while (i < tLine.length()) {
		value = +tLine.charAt(i) - 32;
		bLine = bLine + bc[value+1];
		cksum = cksum + (i+1)*(value);
		ck2sum = cksum % 103;
		i++;
	    }
	    display.append(tLine + "\n");
	    bcode.append(bLine + "\n");
	    textField.setText("");
	    //            chkField.setText(new Integer(ck2sum).toString());
	    chkField.setText(bc[ck2sum+1]);
    	    startButton.setEnabled(true);
    	    start2Button.setEnabled(true);
	}
    }

    class Start2Listener implements ActionListener {
	public void actionPerformed(ActionEvent evt) {
    	    startButton.setEnabled(false);
    	    start2Button.setEnabled(false);
    	    stopButton.setEnabled(true);
    	    clearButton.setEnabled(true);
    	    testButton.setEnabled(true);
	    //convert.start();
	}
    }
    
    class StopListener implements ActionListener {
	public void actionPerformed(ActionEvent evt) {
    	    startButton.setEnabled(true);
    	    stopButton.setEnabled(false);
    	    clearButton.setEnabled(true);
    	    testButton.setEnabled(true);
    	    //convert.stop();
	}
    }

    class ClearListener implements ActionListener {
	public void actionPerformed(ActionEvent evt) {
    	    startButton.setEnabled(true);
    	    stopButton.setEnabled(true);
    	    clearButton.setEnabled(true);
    	    testButton.setEnabled(true);
	    textField.setText("");
            chkField.setText("");
	    display.setText("");
	    bcode.setText("");
	}
    }

    class TestListener implements ActionListener {
	public void actionPerformed(ActionEvent evt) {
    	    startButton.setEnabled(true);
    	    stopButton.setEnabled(true);
    	    clearButton.setEnabled(true);
    	    testButton.setEnabled(true);
	    textField.setText("BarCode 1");
	    chkField.setText("111323");
            String tLine = textField.getText();
	    String bLine = "211214 131123 121124 121241 131321 134111 " +
                           "141221 112214 212222 123221 111323";
	    display.append(tLine + "\n");
	    bcode.append(bLine + "\n");
    	    startButton.setEnabled(true);
    	    start2Button.setEnabled(true);
	}
    }

    public void actionPerformed(ActionEvent evt) {
	String text = textField.getText();
	int value = 104;
	String bLine = bc[value+1]; // start code = 104
	int i = 0;
	cksum = 104;
	ck2sum = 0;
	while (i < text.length()) {
	    value = +text.charAt(i) - 32;
	    bLine = bLine + bc[value+1];
	    cksum = cksum + (i+1)*(value);
	    ck2sum = cksum % 103;
	    i++;
	}
	display.append(text + newLine);
	bcode.append(bLine + "\n");
	chkField.setText(bc[ck2sum+1]);
	textField.selectAll();
    }	


    public void destroy() {
    }

    private Button startButton;
    private Button start2Button;
    private Button stopButton;
    private Button clearButton;
    private Button testButton;

    private Label chksumLabel;
    
    private int i=0;


}