import com.apple.cocoa.foundation.*;
import com.apple.cocoa.application.*;
import java.util.*;

public class MyDrawer extends NSObject {

    Object drawingButton;
    Object maxNumber;
    Object pastNumbers;
    Object resultNumber;

    int[]  nums;
    int     seq;
    int     maxOfSeq;
    
    public void goDrawing(Object sender) {
        NSTextField resultNumberText = (NSTextField)resultNumber;
        NSTextField pastNumList = (NSTextField)pastNumbers;
        NSButton drawingBtn = (NSButton)drawingButton;

        resultNumberText.setStringValue(String.valueOf(nums[seq]));
        pastNumList.setStringValue(pastNumList.stringValue() + "," + String.valueOf(nums[seq]));

        seq++;
        if(seq>=maxOfSeq) {
            pastNumList.setStringValue(pastNumList.stringValue() + " - Finish");
            drawingBtn.setEnabled(false);
        }
    }

    public void insertNextLine(Object sender) {
        NSTextField pastNumList = (NSTextField)pastNumbers;
        pastNumList.setStringValue(pastNumList.stringValue() + " - ");
    }
    
    public void initNumberSequence(Object sender) {
        NSTextField maxNumberText = (NSTextField)maxNumber;
        NSTextField pastNumList = (NSTextField)pastNumbers;
        NSButton drawingBtn = (NSButton)drawingButton;

        maxOfSeq = maxNumberText.intValue();
        nums = new int[maxOfSeq];
        for(int i=1 ; i<=maxOfSeq ; i++)
            nums[i-1] = i;
        seq = 0;
        
        Random myRnum = new Random();
        int repeating = maxOfSeq * 10;
        for( int i=0 ; i<repeating ; i++)     {
            int index1 = (int)(myRnum.nextFloat()*maxOfSeq);
            int index2 = (int)(myRnum.nextFloat()*maxOfSeq);
            int x = nums[index1];
            nums[index1] = nums[index2];
            nums[index2] = x;
        }
        pastNumList.setStringValue("Initialized by " + String.valueOf(maxOfSeq) + " - ");
        drawingBtn.setEnabled(true);
    }
}