// https://stackoverflow.com/questions/4492385/convert-simple-array-into-two-dimensional-array-matrix
// convert a 1D array into a 2D matrix
export function toMatrix(array, width) {
  return array.reduce(
    (rows, key, index) =>
      (index % width == 0
        ? rows.push([key])
        : rows[rows.length - 1].push(key)) && rows,
    []
  );
}

// convert an image into a black and white image
export function picToBlackAndWhite(pixels, width, height) {
  return pixels.reduce((acc, pixel, index) => {
    if (index % 4 == 0) {
      const count = pixels[index] + pixels[index + 1] + pixels[index + 2];
      const colour = count >= 255 ? 255 : 1;
      acc.data[index] = colour;
      acc.data[index + 1] = colour;
      acc.data[index + 2] = colour;
      acc.data[index + 3] = 255;
    }
    return acc;
  }, new ImageData(width, height));
}

// convert an ImageData into a 2D array of boolean (0, 1) values
export function picToBoard(pixels, width, height) {
  const flat = pixels.reduce((acc, pixel, index) => {
    if (index % 4 == 0) {
      const count = pixels[index] + pixels[index + 1] + pixels[index + 2];
      const value = count >= 255 ? 1 : 0;
      acc.push(value);
    }
    return acc;
  }, []);
  return toMatrix(flat, Math.max(width, height));
}