module Tetris
  module Field
    WIDTH = 12
    HEIGHT = 12

    class << self
      def highline
        @highline ||= HighLine.new
      end

      def color(*args)
        highline.color(*args)
      end

      def clear_screen
        write "\e[2J"
      end

      def reset_cursor
        write "\e[2H"
      end

      def hide_cursor
        write "\e[?25l"
      end

      def move_cursor(x, y)
        write "\e[#{y};#{x}H"
      end

      # Gibt die übergebenen Argumente über $stdout.write aus.
      # $stdout wird im nachinein geflusht.
      def write(*args)
        $stdout.write(*args)
        $stdout.flush
      end

      def draw_border
        reset_cursor

        output = []
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U2551, ' ' * WIDTH, ::Unicode::U2551]
        output << [::Unicode::U255A, ::Unicode::U2550 * WIDTH, ::Unicode::U255D]

        puts output.map { |x| x.join('') }
      end

      def draw_fixed_stones
        # NOOP
      end

      def draw_at(chars, options = {})
        move_cursor(options[:x] || 0, options[:y] || 0)
        write(chars)
      end

    end
  end
end