package TimeTame;

# Minimal subclassing attempt for Time::Piece

use 5.006;
use strict;
use warnings;
use Carp;

require Exporter;
use Time::Piece;
use base qw( Time::Piece Exporter );
our @EXPORT = @Time::Piece::EXPORT;
our %EXPORT_TAGS = %Time::Piece::EXPORT_TAGS;

# So our exported time functions and overloaded operators work on our
# new derived classes (and any that derive from *this* class), we
# leave a bread crumb trail during the import. We can't directly check
# isa relationships at this point because @ISA has not been set up
# yet. We'll delay that check for later, using our crumbs.
our($Maybe_Bless, $Source_Bless);
sub import {
  my $call = 0;
  my $pkg;
  while ($pkg = caller($call)) {
    last unless $pkg && $pkg ne 'main';
    $Maybe_Bless = $pkg;
    ++$call;
  }
  $Maybe_Bless ||= __PACKAGE__;
  __PACKAGE__->export_to_level(1, @_);
}

{
  no warnings 'redefine';

  sub Time::Piece::_mktime {
    my ($time, $islocal) = @_;
    my $class;
    if (ref $time) {
      $class = ref $time;
      $time->[Time::Piece::c_epoch] = undef;
      return wantarray ? @$time : bless [@$time, $islocal], $class;
    }
    if ($time !~ /^\d+$/) {
      $class = $time;
      $time  = undef;
    }
    else {
      $class = $Source_Bless ? $Source_Bless : __PACKAGE__->_set_bless;
    }
    my @time = $islocal ?
      CORE::localtime($time) : CORE::gmtime($time);
    wantarray ? @time : bless [@time, $time, $islocal], $class;
  }

  use warnings;
}

sub _set_bless {
  my $class = shift;
  $class ||= __PACKAGE__;
  $Source_Bless = $Maybe_Bless if $Maybe_Bless &&
    $Maybe_Bless->isa($class);
  $Source_Bless ||= $class;
}

1;

##</code><code>##

package TimeFoo;

use 5.006;
use strict;
use warnings;

require Exporter;
use TimeTame;
use base qw(TimeTame Exporter);

our @EXPORT = @TimeTame::EXPORT;
our %EXPORT_TAGS = %TimeTame::EXPORT_TAGS;

1;

##</code><code>##

#!/usr/bin/perl -w

use TimeFoo;
use Time::Seconds;

foreach $str (qw(TimeFoo TimeTame Time::Piece)) {
  print "TimeFoo ", TimeFoo->isa($str) ? "isa " : "is not a ", "$str\n";
}

$t = localtime;
print "localtime made a ", ref $t, " $t\n";

$t2 = TimeFoo->new;
print "new made a ", ref $t2, " $t2\n";

$t3 = $t2 + ONE_DAY;
print "Add made a ", ref $t3, " $t3\n";