//===============================================================================================================================================================================
//Assignment 1
//Nathan Leung
//March 18, 2019
//Java, jre1.8.0_152
//===============================================================================================================================================================================
//The code reads blobs
//I - The x and y coordinate of the location of the asterisk
//O - The original grid with the blobs and the grid after the blob is earased
//===============================================================================================================================================================================
/*List of variables
 *  LENGTH - a class variable for the constant value of the number of rows in the 2D array (byte)
 *  WIDTH - a class variable for the constant value of the the number of columns in the 2D array (byte)
//===============================================================================================================================================================================
 */
import java.io.*;
public class Assignment1 {
	public static final byte LENGTH = 20;
	public static final byte WIDTH = 25;
	/**
	 * main method- Procedural method that calls all the static methods and determines whether the user want to enter the program
	 * 1. Call method commandCenter and to define anyString to see if they want to enter the program and provide a description of the program
	 * 2. Call method blobs to read the file and store into the 2D array
	 * 3. Call method column to read the column number of the asterisk that user chooess
	 * 4. Call method row
	 * @param args
	 * @throws IOException
	 * @throws InterruptedException
	 */

	public static void main(String args[]) throws IOException, InterruptedException{
		char grid[][]= new char[LENGTH][WIDTH];
		byte pointX, pointY;
		boolean flag;
		String anyString;
		anyString= commandCenter();

		while(!anyString.equals("stop")) {
			grid = blobs();
			pointX=column();
			pointY=row();
			flag = eraseBlob(grid, pointY-1,pointX-1);
			anyString = checkFlag(flag,grid);

		}
		System.out.println("Thanks for using Nathan's Program");
	}

	public static String input() throws IOException{
		BufferedReader br=new BufferedReader (new InputStreamReader (System.in));
		String input;
		input=br.readLine();
		return input;
	}

	public static String commandCenter() throws InterruptedException, IOException {
		String word;
		System.out.println("============================================================================================");
		System.out.println("This program will first print out 3 blobs in a 20x25 rectangle.");
		System.out.println("Then the user will be able to input a coordinate on the rectangle to delete a blob");
		System.out.println("If you wish to proceed type [yes]");
		System.out.println("If you do not wish to run the program type [stop]");
		System.out.println("============================================================================================");
		while (true) {
			word=input();
			if (word.equalsIgnoreCase("stop")) {
				return word;
			}
			if (word.equalsIgnoreCase("yes")) {
				System.out.println("Lets begin:");
				System.out.println("Loadng your blob...");
				Thread.sleep(1000);
				return word;
			}
			else {
				System.out.println("Invalid, please try again");
			}
		}
	}

	public static char[][] blobs() throws IOException {
		BufferedReader input=new BufferedReader (new FileReader("D:\\Java\\Blob.txt"));
		String line;

		char grid[][]=new char[LENGTH][WIDTH];
		for(byte row=0;row<LENGTH;row++){
			line=input.readLine();
			for(byte col=0;col<WIDTH;col++){
				grid[row][col]=line.charAt(col);
			}
		}
		gridFinal(grid);
		return grid;
	}

	public static byte column() throws IOException{
		byte x;
		System.out.println("Please input the column number of the point you wish to delete");
		while (true) {
			x = selectPoint();
			if (x<=WIDTH)
				return x;
			else
				System.out.println("The column number is invalid, please try again");
		}
	}

	public static byte row() throws IOException{
		byte y;
		System.out.println("Please input the row number of the point you wish to delete");
		while (true) {
			y = selectPoint();
			if (y<=LENGTH)
				return y;
			else
				System.out.println("The row number is invalid, please try again");
		}
	}

	public static String checkFlag(boolean flag, char[][]grid) throws IOException, InterruptedException{
		String input;
		if(flag==true) {
			System.out.println("One Second, Deleting blob...");
			Thread.sleep(1000);
			gridFinal(grid);
			System.out.println("Your blob has been deleted, enter [yes] to run again, [stop] to end");
			input= input();
			return input;
		}
		else {
			System.out.println("Your point was not an asterick, enter [yes] to continue, [stop] to end");
			input = input();
			return input;
		}
	}
	public static boolean eraseBlob(char grid[][], int y, int x) {
		boolean flag=false;
		if (x>=0&&x<WIDTH&&y>=0&&y<LENGTH) {
			if(grid[y][x]== '*'){
				flag=true;
				grid[y][x]= ' ';
				eraseBlob(grid,y,x+1);
				eraseBlob(grid,y,x-1);
				eraseBlob(grid,y+1,x);
				eraseBlob(grid,y-1,x);
			}
		}
		return flag;
	}

	public static byte selectPoint() throws IOException{
		String temp;
		byte num;
		while (true) {
			try {
				temp = input();
				num = Byte.parseByte(temp);
				break;
			}
			catch (Exception e){
				System.out.println("Input not accpeted, please try again");
			}
		}
		return num;
	}

	public static void gridFinal(char[][]grid){
		System.out.println("  1234567891111111111222222");
		System.out.println("           0123456789012345");
		byte rows=1;

		for(byte row=0;row<LENGTH;row++){
			if(rows<10)
				System.out.print(rows+" ");
			else
				System.out.print(rows);
			rows++;
			for(byte col=0;col<WIDTH;col++){
				System.out.print(grid[row][col]);
			}
			System.out.println();
		}
	}
}