#!/usr/bin/perl

use strict;
use warnings;
use FindBin '$Bin';
use File::Temp 'tempfile';

@ARGV == 2 || do {
	die "Usage: $0 <host:port> <executable>\n";
	exit 1;
};

if( opendir SD, "$Bin/../staging_dir" )
{
	my ( $tid, $arch, $libc, @arches );

	if( $ARGV[1] =~ m!\btarget-([^_/]+)_([^_/]+)\b! )
	{
		print("Using target $1 ($2)\n");
		($arch, $libc) = ($1, $2);
	}
	else
	{
		# Find arches
		print("Choose target:\n");

		while( defined( my $e = readdir SD ) )
		{
			if( -d "$Bin/../staging_dir/$e" && $e =~ /^target-([^_]+)_([^_]+)/ )
			{
				push @arches, [ $1, $2 ];
				printf(" %2d) %s (%s)\n", @arches + 0, $1, $2);
			}
		}

		# Query arch
		do {
			print("Target? > ");
			chomp($tid = <STDIN>);
		} while( !defined($tid) || $tid !~ /^\d+$/ || $tid < 1 || $tid > @arches );

		($arch, $libc) = @{$arches[$tid-1]};
	}

	closedir SD;

	# Find gdb
	my ($gdb) = glob("$Bin/../build_dir/toolchain-${arch}_*_${libc}/gdb-*/gdb/gdb");

	if( -x $gdb )
	{
		my ( $fh, $fp ) = tempfile();

		# Find library paths
		my $libdirs = join ':', (
			glob("$Bin/../build_dir/target-${arch}_${libc}/debug-*/{usr/,}lib/"),
			glob("$Bin/../staging_dir/target-${arch}_${libc}/{usr/,}lib"),
			glob("$Bin/../staging_dir/toolchain-${arch}_*_${libc}/lib")
		);

		print $fh "set solib-search-path $libdirs\n";
		print $fh "target remote $ARGV[0]\n";

		system($gdb, '-x', $fp, $ARGV[1]);

		close($fh);
		unlink($fp);
	}
	else
	{
		print("No gdb found! Make sure that CONFIG_GDB is set!\n");
		exit(1);
	}
}
else
{
	print("No staging_dir found! You need to compile at least once!\n");
	exit(1);
}