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# typed: ignore
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require "stringio"
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require_relative "computer"
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include Math
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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, :rad)
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robot = Robot.new([0, 0], PI/2)
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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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raise "unexpected direction: #{dir}" unless [0, 1].include?(dir)
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robot.rad += -(2*dir - 1) * (PI/2)
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delta = [cos(robot.rad).to_i, sin(robot.rad).to_i]
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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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