// Constants
// Cell initialization

function setup() {
  // Setup boilerplate

  cells[cellIndex(5, 5)] = 1;
  let neighbors = neighborCells(5, 5);
  for (let i=0;i<neighbors.length;i++) {
    cells[neighbors[i]] = 1;
  }

  renderCells();
}

function northIndex(x, y) {
  if (y===0) { return -1; }
  return cellIndex(x, y-1);
}

function southIndex(x, y) {
  if (y===ROWS-1) { return -1; }
  return cellIndex(x, y+1);
}

function eastIndex(x, y) {
  if (x===COLUMNS-1) { return -1; }
  return cellIndex(x+1, y);
}

function westIndex(x, y) {
  if (x===0) { return -1; }
  return cellIndex(x-1, y);
}

function neighborCells(x, y) {
  let neighbors = [];
  neighbors.push(northIndex(x, y));
  neighbors.push(southIndex(x, y));
  neighbors.push(eastIndex(x, y));
  neighbors.push(westIndex(x, y));
  return neighbors.filter(n => n !== -1);
}

// cellIndex()
// renderCells()