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require "stringio"
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require_relative "computer"
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panels = Hash.new {|h,k| h[k] = [0]}
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panels[[0, 0]] = [1]
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i_r, i_w = IO.pipe
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o_r, o_w = IO.pipe
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Robot = Struct.new(:panel, :dir)
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dirs = %i[ up right down left ]
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robot = Robot.new([0, 0], 0)
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t = Thread.new {
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loop do
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i_w.puts(panels[robot.panel].last)
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panels[robot.panel] << o_r.gets.to_i
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dir = o_r.gets.to_i
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delta = case dir
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when 0 then -1
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when 1 then 1
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else raise "unexpected direction: #{dir}"
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end
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robot.dir += delta
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robot.dir %= dirs.size
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dir = dirs.fetch(robot.dir)
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delta = case dir
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when :up then [ 0, 1]
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when :right then [ 1, 0]
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when :down then [ 0, -1]
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when :left then [-1, 0]
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end
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robot.panel = robot.panel.zip(delta).map(&:sum)
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end
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}
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Thread.new { Computer.from(ARGF.read).run(i_r, o_w) }.join
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# p panels.values.count {|v| v.size > 1 }
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min_x, max_x = panels.keys.map(&:first).minmax
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min_y, max_y = panels.keys.map(&:last).minmax
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letters = (min_y..max_y).map {|y|
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(min_x..max_x).map {|x|
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(panels[[x, y]].last == 1) ? ?█ : " "
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}.join
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}.reverse.join("\n")
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puts letters
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