use strict;
use warnings;
use utf8;
use Test::More;
use File::Temp qw(tempdir);
use Time::HiRes qw(time);

my $tmpdir = tempdir(CLEANUP => 0);
my $tmpdir2 = tempdir(CLEANUP => 0);

$ENV{TMPDIR2} = $tmpdir2;

my @cmd = ($^X, 'bin/watcher', "--dir=$tmpdir", '--', $^X, '-e', q[
	warn "GO $$";
	open my $fh, '>>', "$ENV{TMPDIR2}/x.txt" or die $!;
	print {$fh} "XXX\n";
	warn "WROTE $$";
	]);
# my @cmd = ($^X, 'bin/watcher', "--dir=$tmpdir", '--', $^X, '-e', q[warn "GO"; open my $fh, '>>', "$ENV{TEMPDIR2}/x.txt" or die $!"; print {$fh} q!XXX\n!;]);
note "@cmd";

my $pid = fork();
die "Cannot fork: $!" unless defined $pid;
if ($pid==0) { # child
	exec @cmd;
	die "Cannot exec: $!";
} else { # parent
	sleep 1;

	is(read_file(), "XXX\n");
	update();
	sleep 2;

	is(read_file(), "XXX\nXXX\n");
	update();
	sleep 2;

	is(read_file(), "XXX\nXXX\nXXX\n");

	kill 'TERM' => $pid;
	waitpid($pid, 0);
}

done_testing;

sub read_file {
	my $fname = "$tmpdir2/x.txt";
	open my $fh, '<', "$tmpdir2/x.txt" or die "$fname: $!";
	my $src = do { local $/; <$fh> };
	return $src;
}

sub update {
	my $fname = "$tmpdir/@{[ rand ]}.txt";
	diag "updating $fname";

	open my $ofh, '>', $fname or die "$fname: $!";
	print $ofh "YAY " . rand();
	close $ofh;
}