require 'rmagick'
require 'open3'

def pixel_at(images, x, y)
  values = images.map do |image|
    color = image.pixel_color(x, y).red
    color < 257 * 150 ? 0 : 1
  end

  res = values.reduce &:|

  res > 0 ? Magick::Pixel.from_color('white') : Magick::Pixel.from_color('black')
end

begin
  i = 134
  images = []

  loop do
    images.shift
    while (images.length < 3)
      images.push(
        Magick::Image.read("screenshots/screenshot_#{i + images.length}.jpg").first.
          quantize(256, Magick::GRAYColorspace).
          edge.
          negate
      )
    end

    dimensions = {
      cols: images.first.columns,
      rows: images.first.rows
    }

    processed_image = Magick::Image.new(dimensions[:cols], dimensions[:rows])

    0.upto(dimensions[:cols] - 1) do |x|
      0.upto(dimensions[:rows] - 1) do |y|
        processed_image.pixel_color(x, y, pixel_at(images, x, y))
      end
    end

    processed_path = "processed/screenshot_#{i}.jpg"
    processed_image.write(processed_path)

    stdout, stderr, status = Open3.capture3("tesseract #{processed_path} stdout")

    text = stdout.strip

    if text && (text = text.gsub("\n", "")) != ""
      puts text
    else
      print "." if i % 10 == 0
    end

    i += 1

    image = nil
    next_image = nil
  end
rescue Magick::ImageMagickError => e
  puts "DONE! Processed #{i} images"
end