# -*- coding: utf-8 -*-
require 'nyan_cat_formatter'

NyanCatMusicFormatter = Class.new(NyanCatFormatter) do
  MUSIC_LENGTH = 27.06 # seconds

  def osx?
    platform.downcase.include?("darwin")
  end

  def linux?
    platform.downcase.include?('linux')
  end

  def kernel=(kernel)
    @kernel = kernel
  end

  def kernel
    @kernel ||= Kernel
  end

  def platform=(platform)
    @platform = platform
  end

  def platform
    @platform ||= RUBY_PLATFORM
  end

  def nyan_mp3
    File.expand_path('../../data/nyan-cat.mp3', __FILE__)
  end

  def start input
    super
    t = Thread.new do
      loop do
        if osx?
          kernel.system("afplay #{nyan_mp3} &")
        elsif linux?
          play_on_linux
        end
        Thread.current["started_playing"] ||= true
        sleep MUSIC_LENGTH
      end
    end
    until t["started_playing"]
      sleep 0.001
    end
  end

  def kill_music
    if File.exists? nyan_mp3
      if osx?
        system("killall -9 afplay &>/dev/null")
      elsif linux?
        kill_music_on_linux
      end
    end
  end

  private

  def play_on_linux
    kernel.system("[ -e #{nyan_mp3} ] && type mpg321 &>/dev/null && mpg321 #{nyan_mp3} &>/dev/null &") if kernel.system('which mpg321 &>/dev/null && type mpg321 &>/dev/null')
    kernel.system("[ -e #{nyan_mp3} ] && type mpg123 &>/dev/null && mpg123 #{nyan_mp3} &>/dev/null &") if kernel.system('which mpg123 &>/dev/null && type mpg123 &>/dev/null')
  end

  def kill_music_on_linux
    system("killall -9 mpg321 &>/dev/null") if kernel.system("which mpg321 &>/dev/null && type mpg321 &>/dev/null")
    system("killall -9 mpg123 &>/dev/null") if kernel.system("which mpg123 &>/dev/null && type mpg123 &>/dev/null")
  end

end