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package My::Module::Recommend;

use strict;
use warnings;

use Carp;
use Config;

use My::Module::Recommend::Any qw{ __any };
use My::Module::Recommend::All qw{ __all };

my ( $is_5_010, $is_5_012 );

if ( $] ge '5.012' ) {
    $is_5_012 = $is_5_010 = 1;
} elsif ( $] ge '5.010' ) {
    $is_5_010 = 1;
};

my %misbehaving_os = map { $_ => 1 } qw{ MSWin32 cygwin };

my @optionals = (
    __any( 'Astro::Coord::ECI::TLE::Iridium'	=> <<'EOD' ),
      This module is needed if you wish to compute Iridium Classic flare
      events. If you do not intend to do this, this module is not
      needed.
EOD
    __any( 'Astro::SIMBAD::Client'	=> <<'EOD' ),
      This module is required for the 'lookup' subcommand of the
      Astro::App::Satpass2 sky() method, which retrieves astronomical
      objects from the SIMBAD database. If you do not intend to use
      this functionality, Astro::SIMBAD::Client is not needed.
EOD
    __any( 'Astro::SpaceTrack=0.105'	=> <<'EOD' ),
      This module is required for the Astro::App::Satpass2 spacetrack()
      method, which retrieves satellite TLE data from Space Track and
      other web sites. Version 0.105 is needed because of a change in
      the way help is displayed. If you intend to get your TLEs
      externally to this package (say, with a web browser or curl),
      Astro::SpaceTrack is not needed.
EOD
    __any( 'Browser::Open'		=> <<'EOD' ),
      This module is being phased in as the only supported way to
      display web-based help. If you intend to leave the 'webcmd'
      attribute false, this module is not needed.
EOD
    __any( 'Date::Manip'		=> <<'EOD' .
      This module is not required, but the alternative to installing it
      is to specify times in ISO 8601 format.  See 'SPECIFYING TIMES' in
      the 'Astro::App::Satpass2' documentation for the details.
EOD
	( $is_5_010 ? '' : <<'EOD' ) ),

      Unfortunately, the current Date::Manip requires Perl 5.10. Since
      you are running an earlier Perl, you can try installing Date-Manip
      5.54, which is the most recent version that does _not_ require
      Perl 5.10. This version of Date::Manip does not understand summer
      time (a.k.a. daylight saving time).
EOD
    __all( qw{ DateTime DateTime::TimeZone }	=> <<'EOD' ),
      These modules are used to format times, and provide full time zone
      support. If they are not installed, POSIX::strftime() will be
      used, and you may find that you can not display correct local
      times for zones other than your system's default zone or GMT. They
      will also be used (if available) by the ISO8601 time parser
      because they go farther into the past than Time::Local does.
EOD

    # CAVEAT:
    #
    # Unfortunately as things currently stand, the version needs to be
    # maintained three places:
    # - lib/Astro/App/Satpass2/Utils.pm
    # - inc/My/Module/Recommend.pm
    # - inc/My/Module/Test/App.pm
    # These all need to stay the same. Sigh.
    # Any such should be in xt/author/consistent_module_versions.t

    __any( 'DateTime::Calendar::Christian=0.06'	=> <<'EOD' ),
      This module is used to parse (maybe) and format dates that might
      be either Julian or Gregorian. Currently the only parser that has
      this capability is ISO8601. If historical dates in the proleptic
      Gregorian calendar are fine with you, you do not need this module.
EOD
    __any( 'Geo::Coder::OSM'		=> <<'EOD' ),
      This module is required for the Astro::App::Satpass2 geocode()
      method, which computes latitude and longitude based on street
      address. If you do not intend to determine your observing
      locations this way, this module is not needed.
EOD
    __any( 'Geo::WebService::Elevation::USGS'	=> <<'EOD' ),
      This module is required for the Astro::App::Satpass2 height()
      method, which determines height above the reference ellipsoid for
      a given latitude and longitude.  If you do not intend to determine
      your observing locations this way, this module is not needed.
EOD
    __all( qw{ LWP::UserAgent LWP::Protocol URI } => <<'EOD' ),
      These modules are required if you want to use URLs in the init(),
      load(), or source() methods. If you do not intend to use URLs
      there, you do not need these packages. All three packages are
      requirements for most of the other Internet-access functionality,
      so you may get them implicitly if you install some of the other
      optional modules.
EOD
    __any( qw{ Term::ReadLine } => <<'EOD' ),
      This module is required for interactive command recall and
      editing.
EOD
	$is_5_012 ? () : __any( 'Time::y2038' => <<'EOD' .
      This module is not required, but if installed allows you to do
      computations for times outside the usual range of system epoch to
      system epoch + 0x7FFFFFFF seconds.
EOD
	( $misbehaving_os{$^O} ? <<"EOD" : '' ) .

      Unfortunately, Time::y2038 has been known to misbehave when