#!/usr/bin/perl

use strict;
use warnings;

my $script = "falsecolor";
my $csh = "../orig/falsecolor.csh";
my $perl = "../bin/falsecolor.perl";
print "script: $script\n";

use File::Temp qw/ tempdir /;
my $tmpdir = tempdir( CLEANUP => 0 );
print "temp dir: $tmpdir\n";

my $img = "data/images/street-rgbe_rle_400x400.hdr";

my @options = (
		"-ip $img",
		"-ip $img -l cd/m2",   # Label now defaults to cd/m2, not nits.
		"-i $img -p $img -l cd/m2",
		"-ip $img -cl -l cd/m2",
		"-ip $img -n 10 -l cd/m2",
		"-ip $img -s 2000 -l cd/m2",
		"-ip $img -lw 200 -lh 300 -l cd/m2",   # scale is slightly higher now.
);

# Run old CSH and new Perl script with different options,
# compare the resulting images.
my $index = 0;
my $opt;
foreach $opt (@options) {
		my $cshout = "$tmpdir/${script}_csh$index.hdr";
		my $cshcmd = "$script.csh $opt > $cshout";
		print "  $cshcmd\n";
		system "csh ../orig/$cshcmd";

		my $perlout = "$tmpdir/${script}_perl$index.hdr";
		my $perlcmd = "$script.pl $opt > $perlout";
		print "  $perlcmd\n";
		system "perl ../bin/$perlcmd";

		my $diffimg = "$tmpdir/${script}_diff$index.hdr";
		my $uval = &compare_images("$cshout", "$perlout", "$diffimg");
		if( $uval > 0 ) {
			print "      Error: Diff image $diffimg contains $uval unique values (should be one).\n";
			system "ximage $diffimg";
		} else {
			print "      Ok: Images $cshout and $perlout are identical.\n";
		}
}
print "temp dir $tmpdir not removed. Please remove manually.\n";

sub compare_images() {
	my $in1 = shift;
	my $in2 = shift;
	my $out = shift;

	my $cmd = "pcomb $in1 -s -1 $in2 > $out";
	print "    $cmd\n";
	system "$cmd";
	my $unique = `pvalue -h -H -d -u $out`;
	my $unique_cnt = scalar( split( '\n', $unique ) );

	return $unique_cnt;
}

#EOF