package t::lib::Debugger;

use strict;
use warnings FATAL => 'all';

use English qw( -no_match_vars );
local $OUTPUT_AUTOFLUSH = 1;

use Term::ReadLine;
if ( $OSNAME eq 'MSWin32' ) {
	$ENV{TERM} = 'dumb';
	local $ENV{PERL_RL} = ' ornaments=0';
}

if ( $OSNAME eq 'MSWin32' ) {
	require Win32::Process;
	require Win32;
	use constant NORMALPRIORITYCLASS => 0x00000020;
}

#use Data::Printer { caller_info => 1, colored => 1, };
use Exporter ();
use File::Temp qw(tempdir);

our @ISA    = 'Exporter';
our @EXPORT = qw(start_script start_debugger slurp rc_file);

my $host = '127.0.0.1';
my $port = 24642 + int rand(1000);

sub start_script {
	my ($file) = @_;

	my $dir = tempdir( CLEANUP => 0 );
	my $path = $dir;
	my $pid;
	if ( $OSNAME eq 'MSWin32' ) {
		$pid  = 'fudge';                      # as we don't get one from win32
		$path = Win32::GetLongPathName($path);
		local $ENV{PERLDB_OPTS} = "RemotePort=$host:$port";

		sleep 1;
		system( 1, qq($^X -d $file > "$path/out" 2> "$path/err") );

		#spawns an external process and immediately returns its process designator, without waiting for it to terminate

	} else {

		$pid = fork();
		die if not defined $pid;

		if ( not $pid ) {
			local $ENV{PERLDB_OPTS} = "RemotePort=$host:$port";

			sleep 1;
			exec qq($EXECUTABLE_NAME -d $file > "$path/out" 2> "$path/err");
			exit 0;
		}
	}

	return ( $dir, $pid );
}

sub start_debugger {
	require Debug::Client;
	my $debugger = Debug::Client->new( host => $host, port => $port, );
	return $debugger;
}

sub slurp {
	my ($file) = @_;

	open my $fh, '<', $file or die "Could not open '$file' $!";
	local $/ = undef;
	return <$fh>;
}

# the debugger loads custom settings from
# a .perldb file. If the user has it, some
# test outputs might go boo boo.
sub rc_file {
	require File::HomeDir;
	require File::Spec;
	return -e File::Spec->catfile(
		File::HomeDir->my_home,
		'.perldb'
	);
}

1;