#!perl
#
# Tests for the OO interface
#
# Note that these tests could easily run afoul various perlport(1)
# related issues or other operating system idiosyncrasies. Some efforts
# have been made to avoid running certain operating specific tests on
# certain other operating systems.

use warnings;
use strict;

use Test::More tests => 17;

BEGIN { use_ok('File::AtomicWrite') }
can_ok(
  'File::AtomicWrite', qw/new safe_level set_template
    fh filename checksum commit/
);

BEGIN { use_ok('File::Spec') }
BEGIN { use_ok('File::Temp') }

# FAILURE TO READ THE DOCS
eval {
  File::AtomicWrite->new();    # should fail
};
like( $@, qr/missing \S+ option/, 'empty invocation' );

my $work_dir = File::Temp::tempdir( CLEANUP => 1 );
my $test_string = "oo test\n";

eval {
  my $test_file = File::Spec->catfile( $work_dir, 'ootest1' );
  my $aw = File::AtomicWrite->new( { file => $test_file } );
  isa_ok( $aw, 'File::AtomicWrite' );

  my $fh = $aw->fh;
  ok( defined $fh, 'test filehandle' );

  my $filename = $aw->filename;
  ok( -f $filename, 'tmp filename should exist' );

  print $fh $test_string;

  ok( !-f $test_file, 'real filename should not exist' );
  $aw->commit();

  ok( -f $test_file, 'real filename exists' );
  ok( !-f $filename, 'tmp filename should not exist' );

  my $result_fh;
  open( $result_fh, '<', $test_file )
    or diag("Cannot open output file: $!\n");
  my $result_string = do { local $/; <$result_fh> };
  is( $result_string, $test_string,
    'data written to disk matches source data' );
};
diag($@) if $@;

# check that DESTROY cleans things up
eval {
  my $test_file = File::Spec->catfile( $work_dir, 'ootest2' );
  my $aw = File::AtomicWrite->new( { file => $test_file } );

  my $filename = $aw->filename;
  ok( -f $filename, 'tmp filename should exist' );

  undef $aw;
  # http://www.cpantesters.org/cpan/report/07445084-b19f-3f77-b713-d32bba55d77f
  # false alarm or check too soon?
  sleep 1;
  ok( !-f $filename, 'tmp filename should not exist' );
};
diag($@) if $@;

# checksum instance method test
SKIP: {
  eval { require Digest::SHA1; };
  skip( "lack Digest::SHA1 so sorry", 1 ) if $@;

  my $really_important = "Can't corrupt this\n http://xkcd.com/108/ \n";
  my $test_file = File::Spec->catfile( $work_dir, 'ootest3' );

  eval {
    my $aw = File::AtomicWrite->new( { file => $test_file } );

    my $fh = $aw->fh;
    print $fh $really_important;

    my $digest   = Digest::SHA1->new;
    my $checksum = $digest->add($really_important)->hexdigest;

    $aw->checksum($checksum)->commit;
  };
  diag($@) if $@;

  my $result_fh;
  open( $result_fh, '<', $test_file )
    or diag("Cannot open output file: $!\n");
  my $result_string = do { local $/; <$result_fh> };
  is( $result_string, $really_important,
    'data written to disk matches source data' );
}

{
  File::AtomicWrite->set_template("NTDFOSIH_XXXXXXXXX");
  my $test_file = File::Spec->catfile( $work_dir, 'set_template_test' );
  my $aw = File::AtomicWrite->new( { file => $test_file } );
  like( $aw->filename, qr/NTDFOSIH_.{9}/, 'check custom file template name' );

  my $aw2 = File::AtomicWrite->new(
    { file => $test_file, template => 'SNTDBDTB_XXXXXXXXXX' } );
  like( $aw2->filename, qr/SNTDBDTB_.{10}/,
    'check custom file template by option' );
}
