module Barf

# File lib/barf.rb, line 9
def self.print(path)
  image = MiniMagick::Image.open(path)

  terminal_width = `tput cols`.to_i

  # Height must be divisible by 2 for the half pixels to be clean.
  new_height     = [2, (image.height * (0.5 * terminal_width / image.width)).to_i * 2].max

  image.combine_options do |tmp|
    tmp.alpha 'remove'
    tmp.flatten
    tmp.resize "#{terminal_width}x#{new_height}!"
    tmp.dither 'FloydSteinberg'
    tmp.remap __dir__ + '/palette.png'
  end

  # Two dimensional array of pixels:
  image.get_pixels.each_slice(2) do |top, bottom|
    out = Parallel.map_with_index(top) do |pixel, index|
      "\u2584".bg(pixel).fg(bottom[index])
    end.join
    puts out
  end
  return nil
end