#!/usr/bin/perl

use strict;
use warnings;

use Test::More;

BEGIN {
   $ENV{PERL_FUTURE_DEBUG} = 1;
}

use Future;

use Time::HiRes qw( gettimeofday tv_interval );

my $LINE;
my $LOSTLINE;

sub warnings(&)
{
   my $code = shift;
   my $warnings = "";
   local $SIG{__WARN__} = sub { $warnings .= shift };
   $code->();
   $LOSTLINE = __LINE__; return $warnings;
}

is( warnings {
      my $f = Future->new;
      $f->done;
   }, "", 'Completed Future does not give warning' );

is( warnings {
      my $f = Future->new;
      $f->cancel;
   }, "", 'Cancelled Future does not give warning' );

like( warnings {
      $LINE = __LINE__; my $f = Future->new;
      undef $f;
   },
   qr/^Future=\S+ was constructed at \Q$0\E line $LINE and was lost near \Q$0\E line (?:$LOSTLINE|${\($LINE+1)}) before it was ready\.$/,
   'Lost Future raises a warning' );

my $THENLINE;
my $SEQLINE;
like( warnings {
      $LINE = __LINE__; my $f1 = Future->new;
      $THENLINE = __LINE__; my $fseq = $f1->then( sub { } ); undef $fseq;
      $SEQLINE = __LINE__; $f1->done;
   },
   qr/^Future=\S+ was constructed at \Q$0\E line $THENLINE and was lost near \Q$0\E line (?:$SEQLINE|$THENLINE) before it was ready\.
Future=\S+ \(constructed at \Q$0\E line $LINE\) lost a sequence Future at \Q$0\E line $SEQLINE\.$/,
   'Lost sequence Future raises warning' );

{
   local $Future::TIMES = 1;

   my $before = [ gettimeofday ];

   my $future = Future->new;

   ok( defined $future->btime, '$future has btime with $TIMES=1' );
   ok( tv_interval( $before, $future->btime ) >= 0, '$future btime is not earlier than $before' );

   $future->done;

   ok( defined $future->rtime, '$future has rtime with $TIMES=1' );
   ok( tv_interval( $future->btime, $future->rtime ) >= 0, '$future rtime is not earlier than btime' );
   ok( tv_interval( $future->rtime ) >= 0, '$future rtime is not later than now' );

   ok( defined $future->elapsed, '$future has ->elapsed time' );
   ok( $future->elapsed >= 0, '$future elapsed time >= 0' );
}

done_testing;