// Original game of life algorithm
//
// 1. Death: if the count is less than 2 or greater than 3, the current cell is switched off.
// 2. Survival: if (a) the count is exactly 2, or (b) the count is exactly 3 and the current cell is on, the current cell is left unchanged.
// 3. Birth: if the current cell is off and the count is exactly 3, the current cell is switched on.

int width = 200, height = 200, cellSize = 8;

int maxCells = (width * height) / cellSize;
Cell[][] cells = new Cell[width / cellSize][height / cellSize];

void setup() 
{ 
	size(width, height); 
	framerate(24);
	
	maxCells = 0;
	
	for (int y = 0; y < (height / cellSize); y++) 
	{
		for (int x = 0; x < (width / cellSize); x++, maxCells++)
		{
			cells[y][x] = new Cell();
			cells[y][x].set_x(x * cellSize);
			cells[y][x].set_y(y * cellSize);
			cells[y][x].set_size(cellSize);
			if (random(1) > 0.92)
			{
				cells[y][x].set_state_on();
			}
			else
			{
				cells[y][x].set_state_off();
			}
			cells[y][x].draw_cell();
		}
	}
} 

void loop() 
{
    delay(200);
    
    if (mousePressed == true)
    {
        setup();
    }
    
	for (int y = 0; y < (height / cellSize); y++) 
	{
		for (int x = 0; x < (width / cellSize); x++, maxCells++)
		{
			int infected = 0;
		
		    cells[y][x] = cells[y][x];
			
			if (x > 0 && x < (width / cellSize) - 1 && y > 0 && y < (height / cellSize) - 1)
			{
				for (int sy = -1; sy <= 1; sy++)
				{
					for (int sx = -1; sx <= 1; sx++)
					{
						if (cells[y + sy][x + sx].get_state())
						{
							infected++;
						}
					}
				}
				
				if (infected < 2 || infected > 3)
				{
				    // Death
					cells[y][x].set_state_off();
				}
				else if (cells[y][x].get_state() == false && infected == 3)
				{
				    // Birth
					cells[y][x].set_state_on();
				}
				
				cells[y][x].draw_cell();
			}
		}
	}
	
}

class Cell
{
	int x, y, cellSize;
	boolean state;
	
	Cell()
	{
	}
	
	void set_state_on()
	{
		this.state = true;
	}
	
	void set_state_off()
	{
		this.state = false;
	}
	
	void set_x(int x)
	{
		this.x = x;
	}
	
	void set_y(int y)
	{
		this.y = y;
	}
	
	void set_size(int cellSize)
	{
		this.cellSize = cellSize;
	}
	
	boolean get_state()
	{
		return this.state;
	}
	
	int get_x()
	{
		return this.x;
	}
	
	int get_y()
	{
		return this.y;
	}
	
	void draw_cell()
	{	
		if (this.get_state())
		{
			fill(175, 175, 202);
		}
		else
		{
			fill(102, 153, 102);
		}
		rect(this.x, this.y, this.cellSize, this.cellSize);
	}
}