/*	ArrayTester2D.java
*/
 
import java.io.*;
 
/**	ArrayTester2D
*/
public class ArrayTester2D{
 
	private static final int ROWS = 10;
	private static final int COLUMNS = 14;
 
	
	// instance variable
	boolean[][] array;
 
	/**	Constructor which initializes the array of booleans
	*	so that every array element is true.
	*/
	public ArrayTester2D(){
		array = new boolean[ArrayTester2D.ROWS ][ArrayTester2D.COLUMNS ];
		for (int i = 0;i<ArrayTester2D.ROWS ;i++){
			for (int j = 0;j< ArrayTester2D.COLUMNS ;j++){
				array[i][j] = true;
			}
		}
	}
 
	/**	
	*/
	public static void main(String[] args){
 
		ArrayTester2D arraytester2d = new ArrayTester2D();
		arraytester2d.init();
 
	}
 
	/**	Runs the program and iterates in a while loop unitl the use enters in 
	*	a quit command.
	*/
	public void init(){
 
		boolean done = false;
		while (!done){
			int row = -1;
			int column = -1;
			printArray();
			printRowStatus();
			printColumnStatus();
			String message = "Enter a Row Number between 1 and " + String.valueOf(ArrayTester2D.ROWS) + " or QUIT to exit.";
			promptUser(message);
			String inputstring = getUserInput();
			done = (inputstring.compareToIgnoreCase("Quit") == 0);
			if ((getInt(inputstring) > 0) && (getInt(inputstring) < ArrayTester2D.ROWS )){
				row = getInt(inputstring) - 1;//array rows start at 0
				message = "Enter a Column Number between 1 and " + String.valueOf(ArrayTester2D.COLUMNS) + " or QUIT to exit.";
				promptUser(message);
				inputstring = getUserInput();
				if ((getInt(inputstring) > 0) && (getInt(inputstring) < ArrayTester2D.COLUMNS)){
					column = getInt(inputstring) - 1;
					setCellOff(row,column);
				}
			}
		}
		//now exit
		System.exit(0);
	}
 
	/**	printArray prints the contents of the two dimensional array, row by row.
	*/
	public void printArray(){
		for (int i = 0;i<ArrayTester2D.ROWS ;i++){
			for (int j = 0;j< ArrayTester2D.COLUMNS ;j++){
				if (array[i][j]){
					System.out.print("T "); //each column in the row
				}else{
					System.out.print("F "); //each column in the row				
				}
			}
			System.out.print("\n"); //end of row
		}
 
	}
 
	/**	prints the status of all rows.
	*/
	public void printRowStatus(){
		for (int i = 0; i<ArrayTester2D.ROWS ;i++){
			if (isRowFalse(i)) System.out.println("Row " + String.valueOf(i) + " is all false.");
		}
 
	}
 
	/**	prints the status of all columns.
	*/
	public void printColumnStatus(){
		for (int j = 0; j<ArrayTester2D.ROWS ;j++){
			if (isColumnFalse(j)) System.out.println("Column " + String.valueOf(j) + " is all false.");
		}
 
	}
 
	/**	Sets a single cell at (i,j) to false.
	*/
	public void setCellOff(int i, int j){
		array[i][j] = false;
	}
 
	/**	Sets a single cell at (i,j) to true.
	*/
	public void setCellOn(int i, int j){
		array[i][j] = true;
	}
 
	/**	Checks if all elements of row i are false.
	*/
	public boolean isRowFalse(int i){
		boolean status = true;
		for (int j = 0;j< ArrayTester2D.COLUMNS ;j++){
			status = (status && (!array[i][j]));
		}
		return status;
	}
 
	/**	Checks if all elements of column j are false.
	*/
	public boolean isColumnFalse(int j){
		boolean status = true;
		for (int i = 0;i<ArrayTester2D.ROWS ;i++){
			status = (status && (!array[i][j]));
		}
		return status;
	}
 
	/**	Reads a line of input from the user.
	*/
	public String getUserInput(){
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
		String lineread = "";
		try{
			lineread = br.readLine();
		}catch(IOException ioe){
			System.err.println("IOException: " + ioe.getMessage());
		}
		return lineread;	
	}
 
	/**	Displays message string to user.
	*/
	public void promptUser(String message){
		System.out.println(message);
	}
 
	/**	Converts the string to an integer.
	*	Returns -1 if not an integer. 
	*/
	public int getInt(String s){
		int n = -1;
		try{
			n = Integer.parseInt(s);
		}catch(NumberFormatException nfe){
			if (s.compareToIgnoreCase("Quit") == 0) System.exit(0);
			System.err.println("NumberFormatException: " + nfe.getMessage());
		}
		return n;
	}
}