require "clock_window/version"

module ClockWindow
  class ClockIt
    # As this will get more sophisticated this class is the UI
    def initialize
      @os_cmd = OScommand.new
    end

    def active_window
      exe, format = @os_cmd.active_window
      format.call(`#{exe}`)
    end
  end

  class OScommand
    # As this will get more sophisticated this class is the Back End
    def initialize
      # Detect operating system
      @os = "Linux"
    end

    # output will be a two parameter array
    # the first will be an OS specific executable string
    # the second will be formatting the return value from the executables output
    def active_window
      # Choose script to execute and format output to just window name
      case @os
      when "Linux"
        exe = "xprop -id $(xprop -root 32x '\t$0' _NET_ACTIVE_WINDOW | cut -f 2) _NET_WM_NAME"
        format = ->str{ str.match(/.*\"(.*)\"\n\z/)[1][0..60] }
        [exe, format]
      else
        raise "Not implemented"
      end
    end
  end
  private_constant :OScommand
end