require 'set'

class DeviceDetector
  class OS < Parser

    def name
      os_info[:name]
    end

    def short_name
      os_info[:short]
    end

    def family
      os_info[:family]
    end

    def desktop?
      DESKTOP_OSS.include?(family)
    end

    def full_version
      raw_version = super.to_s.split('_').join('.')
      raw_version == '' ? nil : raw_version
    end

    private

    def os_info
      from_cache(['os_info', self.class.name, user_agent]) do
        os_name = NameExtractor.new(user_agent, regex_meta).call
        if os_name && short = DOWNCASED_OPERATING_SYSTEMS[os_name.downcase]
          os_name = OPERATING_SYSTEMS[short]
        else
          short = 'UNK'
        end
        { name: os_name, short: short, family: FAMILY_TO_OS[short] }
      end
    end

    DESKTOP_OSS = Set.new(['AmigaOS', 'IBM', 'GNU/Linux', 'Mac', 'Unix', 'Windows', 'BeOS', 'Chrome OS'])

    # OS short codes mapped to long names
    OPERATING_SYSTEMS = {
        'AIX' => 'AIX',
        'AND' => 'Android',
        'AMG' => 'AmigaOS',
        'ATV' => 'Apple TV',
        'ARL' => 'Arch Linux',
        'BTR' => 'BackTrack',
        'SBA' => 'Bada',
        'BEO' => 'BeOS',
        'BLB' => 'BlackBerry OS',
        'QNX' => 'BlackBerry Tablet OS',
        'BMP' => 'Brew',
        'CES' => 'CentOS',
        'COS' => 'Chrome OS',
        'CYN' => 'CyanogenMod',
        'DEB' => 'Debian',
        'DFB' => 'DragonFly',
        'FED' => 'Fedora',
        'FOS' => 'Firefox OS',
        'BSD' => 'FreeBSD',
        'GNT' => 'Gentoo',
        'GTV' => 'Google TV',
        'HPX' => 'HP-UX',
        'HAI' => 'Haiku OS',
        'IRI' => 'IRIX',
        'INF' => 'Inferno',
        'KNO' => 'Knoppix',
        'KBT' => 'Kubuntu',
        'LIN' => 'GNU/Linux',
        'LBT' => 'Lubuntu',
        'VLN' => 'VectorLinux',
        'MAC' => 'Mac',
        'MAE' => 'Maemo',
        'MDR' => 'Mandriva',
        'SMG' => 'MeeGo',
        'MCD' => 'MocorDroid',
        'MIN' => 'Mint',
        'MLD' => 'MildWild',
        'MOR' => 'MorphOS',
        'NBS' => 'NetBSD',
        'MTK' => 'MTK / Nucleus',
        'WII' => 'Nintendo',
        'NDS' => 'Nintendo Mobile',
        'OS2' => 'OS/2',
        'T64' => 'OSF1',
        'OBS' => 'OpenBSD',
        'PSP' => 'PlayStation Portable',
        'PS3' => 'PlayStation',
        'RHT' => 'Red Hat',
        'ROS' => 'RISC OS',
        'REM' => 'Remix OS',
        'RZD' => 'RazoDroiD',
        'SAB' => 'Sabayon',
        'SSE' => 'SUSE',
        'SAF' => 'Sailfish OS',
        'SLW' => 'Slackware',
        'SOS' => 'Solaris',
        'SYL' => 'Syllable',
        'SYM' => 'Symbian',
        'SYS' => 'Symbian OS',
        'S40' => 'Symbian OS Series 40',
        'S60' => 'Symbian OS Series 60',
        'SY3' => 'Symbian^3',
        'TDX' => 'ThreadX',
        'TIZ' => 'Tizen',
        'UBT' => 'Ubuntu',
        'WTV' => 'WebTV',
        'WIN' => 'Windows',
        'WCE' => 'Windows CE',
        'WMO' => 'Windows Mobile',
        'WPH' => 'Windows Phone',
        'WRT' => 'Windows RT',
        'XBX' => 'Xbox',
        'XBT' => 'Xubuntu',
        'YNS' => 'YunOs',
        'IOS' => 'iOS',
        'POS' => 'palmOS',
        'WOS' => 'webOS'
       }

    DOWNCASED_OPERATING_SYSTEMS = OPERATING_SYSTEMS.each_with_object({}){|(short,long),h| h[long.downcase] = short}

    OS_FAMILIES = {
        'Android'               => ['AND', 'CYN', 'REM', 'RZD', 'MLD', 'MCD', 'YNS'],
        'AmigaOS'               => ['AMG', 'MOR'],
        'Apple TV'              => ['ATV'],
        'BlackBerry'            => ['BLB', 'QNX'],
        'Brew'                  => ['BMP'],
        'BeOS'                  => ['BEO', 'HAI'],
        'Chrome OS'             => ['COS'],
        'Firefox OS'            => ['FOS'],
        'Gaming Console'        => ['WII', 'PS3'],
        'Google TV'             => ['GTV'],
        'IBM'                   => ['OS2'],
        'iOS'                   => ['IOS'],
        'RISC OS'               => ['ROS'],
        'GNU/Linux'             => ['LIN', 'ARL', 'DEB', 'KNO', 'MIN', 'UBT', 'KBT', 'XBT', 'LBT', 'FED', 'RHT', 'VLN', 'MDR', 'GNT', 'SAB', 'SLW', 'SSE', 'CES', 'BTR', 'SAF'],
        'Mac'                   => ['MAC'],
        'Mobile Gaming Console' => ['PSP', 'NDS', 'XBX'],
        'Real-time OS'          => ['MTK', 'TDX'],
        'Other Mobile'          => ['WOS', 'POS', 'SBA', 'TIZ', 'SMG', 'MAE'],
        'Symbian'               => ['SYM', 'SYS', 'SY3', 'S60', 'S40'],
        'Unix'                  => ['SOS', 'AIX', 'HPX', 'BSD', 'NBS', 'OBS', 'DFB', 'SYL', 'IRI', 'T64', 'INF'],
        'WebTV'                 => ['WTV'],
        'Windows'               => ['WIN'],
        'Windows Mobile'        => ['WPH', 'WMO', 'WCE', 'WRT']
    }

    FAMILY_TO_OS = OS_FAMILIES.each_with_object({}) do |(family,oss),h|
      oss.each{|os| h[os] = family}
    end

    def filenames
      ['oss.yml']
    end

  end

end