use t::TestYAML;
use JSON::Syck;
use Test::More;
use FindBin '$RealBin';

chdir $RealBin;

unless (-w $RealBin) {
    plan skip_all => "Can't write to $RealBin";
    exit;
}

plan tests => 12;

*::LoadFile = *JSON::Syck::LoadFile;

# remember where *DATA begins
my $pos = tell(DATA);
die "tell(DATA) failed: $!" unless $pos != -1;

# read via a GLOB
is(LoadFile(*DATA), "a simple scalar", 'LoadFile(*DATA) works');

# rewind *DATA
seek(DATA, $pos, 0)==1 or die "rewind *DATA failed: $!";

# read via a GLOB ref
is(LoadFile(\*DATA), "a simple scalar", 'LoadFile(\*DATA) works');

sub write_file {
    my ($fh, $contents) = @_;
    local *H;
    open(H, "> $fh") or die $!;
    print H $contents;
    close(H);
}

# write YAML to a file
write_file('loadfile.json', "---\na simple scalar");
write_file('emptyfile.json', "");
END {
    unlink 'loadfile.json' or die "can't delete 'loadfile.json': $!" if -e 'loadfile.json';
    unlink 'emptyfile.json' or die "can't delete 'emptyfile.json': $!" if -e 'emptyfile.json';
}

# using file names
is(LoadFile('loadfile.json'), "a simple scalar", 'LoadFile works with file names');

# read via IO::File
{
    require IO::File;
    my $h = IO::File->new('loadfile.json');
    is(LoadFile($h), "a simple scalar", 'LoadFile works with IO::File');
    close($h);
}

# read via indirect file handles
SKIP: {
    skip "indirect file handles require 5.6 or later", 1 unless $] >= 5.006000;

    open(my $h, 'loadfile.json');
    is(LoadFile($h), "a simple scalar", 'LoadFile works with indirect filehandles');
    close($h);
}

# read via ordinary filehandles
{
    local *H;
    open(H, 'loadfile.json');
    is(LoadFile(*H), "a simple scalar", 'LoadFile works with ordinary filehandles');
    close(H);
}

# read via ordinary filehandles (refs)
{
    local *H;
    open(H, 'loadfile.json');
    is(LoadFile(\*H), "a simple scalar", 'LoadFile works with glob refs');
    close(H);
}

# load from "in memory" file
SKIP : {
    skip "in-memory files require 5.8 or later", 1 unless $] >= 5.00800;

    open(my $h, '<', \'a simple scalar');
    is(LoadFile($h), "a simple scalar", 'LoadFile works with in-memory files');
    close($h);
}

{ # Load empty file fails
    my $json = eval {LoadFile('emptyfile.json')};
    like($@, qr/^'emptyfile.json' is non-existant or empty at/ms, "LoadFile dies loading an empty file");
    is($json, undef, "LoadFile returns undef loading an empty file");
}

  { # Load empty file handle fails
    open(my $fh, '<', 'emptyfile.json') or die;
    my $json = eval {LoadFile($fh)};
    like($@, qr/^Cannot load an empty file at/ms, "LoadFile dies loading an empty file");
    is($json, undef, "LoadFile returns undef loading an empty file");
}


__DATA__
"a simple scalar"