#include "TimeStep.h"

// default constructor
TimeStep::TimeStep()
{
	Cell newCell;

	   for(int a=0; a<=11; a++)
		   for(int b=0; b<=11; b++)
			   grid[a][b] = newCell;  
}

// constructor -- takes the step number
TimeStep::TimeStep(int n)
{ 
	   step = n;

	  
   Cell newCell;

	   for(int a=0; a<=11; a++)
		   for(int b=0; b<=11; b++)
			   grid[a][b] = newCell;  

}


//returns the particular cell 
//	(the actual object, not just its value)
//	specified by row x and column y in the 2D CA.
Cell& TimeStep::TheCell(int x, int y)
{
	   return grid[x][y];
}


//returns the number of on cells around a particular cell
//notice that I have to use the previous step's information
int TimeStep::On(int x, int y)
{
	on_counter = 0; 

	for(int i = x-1; i<=x+1; i++)

		for(int j= y-1; j<=y+1; j++)
		{
			on_counter += TheCell(i,j).status;
		}
				
		on_counter -= TheCell(x,y).status;  
		//subtract the status of the cell itself; we don't want to count it 
		//it's easiest to construct these for loops to count all 9 
		//of them, then subtract the middle one

		return on_counter;
		
}

//determines the next step; the rule is S23/B3
//	 ("Conway's Game of Life"):
//   a cell remains alive if it is surrounded by 
//   2 or 3 alive cells; a cell is born if it 
//   surrounded by 3 alive cells -- otherwise the cell
//   dies or remains dead
void TimeStep::EvolutionConwaysLife(TimeStep previousStep)
{
	for(int q=1; q<=10; q++)
	{
		for(int r=1; r<=10; r++)
		{
			if (previousStep.TheCell(q,r).status == 0)
			{
				if (previousStep.On(q,r) == 3)
				{
					TheCell(q,r).status = 1;  //born; otherwise still dead
				}

			}
			else   // else alive (status is 1)
			{
				if ((previousStep.On(q,r) !=2) && (previousStep.On(q,r)!=3))
				{
					TheCell(q,r).status = 0;  // dies; otherwise still alive
											  //	(see the "else" below)
				}
				else
				{
					TheCell(q,r).status = 1;  //born; otherwise still dead
					// must explicitly set the status of the remaining live cells
					//	to 1 because "this" is a newly created TimeStep that was
					//	created with all cells defaulted to a status of 0
				}
			}
		}
	}

}

//determines the next step; the rule is S5/B345
//	  ("Long Life"):
//   a cell remains alive if it is surrounded by 
//   5 alive cells; a cell is born if it 
//   surrounded by 3, 4, or 5 alive cells -- 
//	  otherwise the cell
//   dies or remains dead
void TimeStep::EvolutionLongLife(TimeStep previousStep)
{
	for(int q=1; q<=10; q++)
	{
		for(int r=1; r<=10; r++)
		{
			if (previousStep.TheCell(q,r).status == 0)
			{
				if ((previousStep.On(q,r) == 3) || (previousStep.On(q,r) == 4) || (previousStep.On(q,r) == 5))
				{
					TheCell(q,r).status = 1;  //born; otherwise still dead
				}

			}
			else   // else alive (status is 1)
			{
				if ((previousStep.On(q,r) != 5))
				{
					TheCell(q,r).status = 0;  // dies; otherwise still alive 
											  //	(see the "else" below)
				}
				else
				{
					TheCell(q,r).status = 1;  //born; otherwise still dead
					// must explicitly set the status of the remaining live cells
					//	to 1 because "this" is a newly created TimeStep that was
					//	created with all cells defaulted to a status of 0
				}
			}
		}
	}

}