module Artii
  module Figlet

    class Smusher

      def initialize(font)
        @font = font
      end

      def [](result)
        todo = false

        @font.height.times do |j|
          result[j] = result[j].sub(pattern) { todo, x = callback(todo, $1, $2); x }
        end
        @font.height.times do |j|
          result[j] = if todo
            result[j].sub(/\s\x00(?!$)|\x00\s/, '').sub(/\x00(?!$)/, '')
          else
            result[j].sub(/\x00(?!$)/, '')
          end
        end
      end

      def pattern
        @pattern ||= /([^#{@font.hard_blank}\x00\s])\x00([^#{@font.hard_blank}\x00\s])/
      end

      def symbols
        @@symbols ||= {
          24 => '|/\\[]{}()<>',
          8 => {'[' => ']', ']' => '[', '{' => '}', '}' => '{', '(' => ')', ')' => '('},
          16 => {"/\\" => '|', "\\/" => 'Y', '><' => 'X'}
        }
      end

      def old_layout?(n)
        @font.old_layout & n > 0
      end

      def callback(s, a, b)
        combined = a + b

        if old_layout?(1) && a == b
          return true, a
        elsif old_layout?(2) && ('_' == a && symbols[24].include?(b) || '_' == b && symbols[24].include?(a))
          return true, a
        elsif old_layout?(4) && ((left = symbols[24].index(a)) && (right = symbols[24].index(b)))
          return true, (right > left ? b : a)
        elsif old_layout?(8) && (symbols[8].has_key?(b) && symbols[8][b] == a)
          return true, '|'
        elsif old_layout?(16) && symbols[16].has_key?(combined)
          return true, symbols[16][combined]
        elsif old_layout?(32) && (a == b && @font.hard_blank == a)
          return true, @font.hard_blank
        else
          return s, "#{a}\00#{b}"
        end
      end

    end

  end # module Figlet
end # module Artii