import java.io.File;

import java.io.FileNotFoundException;

import java.util.ArrayList;

import java.util.List;

import java.util.Scanner;

import javax.swing.JFrame;

/**

* Example simulation of Conway's Game of Life.

*/

public class Main {

public static final int SIZE = 20;

/**

* Returns an example of a Blinker and a Glider.

*

* @return hard-coded grid

*/

public static Grid example() {

Grid grid = new Grid(30, 25, SIZE);

grid.flip(1, 2);

grid.flip(2, 2);

grid.flip(3, 2);

grid.flip(6, 1);

grid.flip(7, 2);

grid.flip(7, 3);

grid.flip(8, 1);

grid.flip(8, 2);

return grid;

}

/**

* Creates a grid based on a plain text file.

* http://www.conwaylife.com/wiki/Plaintext

*

* @param path the path to the file

* @return grid based on file contents

*/

public static Grid readFile(String path) {

// open the file at the given path

Scanner scan = null;

try {

File file = new File(path);

scan = new Scanner(file);

} catch (FileNotFoundException e) {

e.printStackTrace();

System.exit(1);

}

// read file contents into memory

List<String> data = new ArrayList<String>();

while (scan.hasNextLine()) {

String line = scan.nextLine();

// ignore blank lines and comments

if (!line.isEmpty() && !line.startsWith("!")) {

data.add(line);

}

}

// validate the file contents

int rows = data.size();

if (rows == 0) {

throw new IllegalArgumentException("empty file");

}

int cols = data.get(0).length();

for (String line : data) {

if (line.length() != cols) {

throw new IllegalArgumentException("invalid file");

}

}

// create the resulting grid

Grid grid = new Grid(rows, cols, SIZE);

for (int r = 0; r < rows; r++) {

String line = data.get(r);

for (int c = 0; c < cols; c++) {

char x = line.charAt(c);

if (x == 'O') {

grid.flip(r, c);

}

}

}

return grid;

}

/**

* Sets up the grid, creates the drawing, and plays the game.

*

* @param args command-line arguments

*/

public static void main(String[] args) {

// create the grid

Grid grid;

if (args.length != 1) {

grid = example();

} else {

grid = readFile(args[0]);

}

// set up the drawing

Drawing drawing = new Drawing(grid);

JFrame frame = new JFrame("Drawing");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(drawing);

frame.pack();

frame.setVisible(true);

// main simulation loop

while (true) {

// update the drawing

grid.update();

drawing.repaint();

// delay the simulation

try {

Thread.sleep(500);

} catch (InterruptedException e) {

// do nothing

}

}

}

}