#
# InspIRCd -- Internet Relay Chat Daemon
#
#   Copyright (C) 2010 Daniel De Graaf <danieldg@inspircd.org>
#   Copyright (C) 2007-2008 Craig Edwards <craigedwards@brainbox.cc>
#   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
#   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
#
# This file is part of InspIRCd.  InspIRCd is free software: you can
# redistribute it and/or modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation, version 2.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#


package make::utilities;

require 5.8.0;

use strict;
use warnings FATAL => qw(all);

use Exporter 'import';
use POSIX;
use Getopt::Long;
use Fcntl;
our @EXPORT = qw(make_rpath pkgconfig_get_include_dirs pkgconfig_get_lib_dirs pkgconfig_check_version translate_functions promptstring);

# Parse the output of a *_config program,
# such as pcre_config, take out the -L
# directive and return an rpath for it.

# \e[1;32msrc/Makefile\e[0m

my %already_added = ();
my $if_skip_lines = 0;

sub promptstring($$$$$)
{
	my ($prompt, $configitem, $default, $package, $commandlineswitch) = @_;
	my $var;
	if (!$main::interactive)
	{
		my $opt_commandlineswitch;
		GetOptions ("$commandlineswitch=s" => \$opt_commandlineswitch);
		if (defined $opt_commandlineswitch)
		{
			print "\e[1;32m$opt_commandlineswitch\e[0m\n";
			$var = $opt_commandlineswitch;
		}
		else
		{
			die "Could not detect $package! Please specify the $prompt via the command line option \e[1;32m--$commandlineswitch=\"/path/to/file\"\e[0m";
		}
	}
	else
	{
		print "\nPlease enter the $prompt?\n";
		print "[\e[1;32m$default\e[0m] -> ";
		chomp($var = <STDIN>);
	}
	if ($var eq "")
	{
		$var = $default;
	}
	$main::config{$configitem} = $var;
}

sub make_rpath($;$)
{
	my ($executable, $module) = @_;
	chomp(my $data = `$executable`);
	my $output = "";
	while ($data =~ /-L(\S+)/)
	{
		my $libpath = $1;
		if (!exists $already_added{$libpath})
		{
			print "Adding extra library path to \e[1;32m$module\e[0m ... \e[1;32m$libpath\e[0m\n";
			$already_added{$libpath} = 1;
		}
		$output .= "-Wl,-rpath -Wl,$libpath -L$libpath " unless defined $main::opt_disablerpath;
		$data =~ s/-L(\S+)//;
	}
	return $output;
}

sub extend_pkg_path()
{
	if (!exists $ENV{PKG_CONFIG_PATH})
	{
		$ENV{PKG_CONFIG_PATH} = "/usr/lib/pkgconfig:/usr/local/lib/pkgconfig:/usr/local/libdata/pkgconfig:/usr/X11R6/libdata/pkgconfig";
	}
	else
	{
		$ENV{PKG_CONFIG_PATH} .= ":/usr/local/lib/pkgconfig:/usr/local/libdata/pkgconfig:/usr/X11R6/libdata/pkgconfig";
	}
}

sub pkgconfig_get_include_dirs($$$;$)
{
	my ($packagename, $headername, $defaults, $module) = @_;

	my $key = "default_includedir_$packagename";
	if (exists $main::config{$key})
	{
		print "Locating include directory for package \e[1;32m$packagename\e[0m for module \e[1;32m$module\e[0m... ";
		my $ret = $main::config{$key};
		print "\e[1;32m$ret\e[0m (cached)\n";
		return $ret;
	}

	extend_pkg_path();

	print "Locating include directory for package \e[1;32m$packagename\e[0m for module \e[1;32m$module\e[0m... ";

	my $v = `pkg-config --modversion $packagename 2>/dev/null`;
	my $ret = `pkg-config --cflags $packagename 2>/dev/null`;
	my $foo = "";
	if ((!defined $v) || ($v eq ""))
	{
		print "\e[31mCould not find $packagename via pkg-config\e[m (\e[1;32mplease install pkg-config\e[m)\n";
		$foo = `locate "$headername" 2>/dev/null | head -n 1`;
		my $find = $foo =~ /(.+)\Q$headername\E/ ? $1 : '';
		chomp($find);
		if ((defined $find) && ($find ne "") && ($find ne $packagename))
		{
			print "(\e[1;32mFound via search\e[0m) ";
			$foo = "-I$1";
		}
		else
		{
			$foo = " ";
			undef $v;
		}
		$ret = "$foo";
	}
	if (($defaults ne "") && (($ret eq "") || (!defined $ret)))
	{
		$ret = "$foo " . $defaults;
	}
	chomp($ret);
	if ((($ret eq " ") || (!defined $ret)) && ((!defined $v) || ($v eq "")))
	{
		my $key = "default_includedir_$packagename";
		if (exists $main::config{$key})
		{
			$ret = $main::config{$key};
		}
		else
		{
			$headername =~ s/^\///;
			promptstring("path to the directory containing $headername", $key, "/usr/include",$packagename,"$packagename-includes");
			$packagename =~ tr/a-z/A-Z/;
			if (defined $v)
			{
				$main::config{$key} = "-I$main::config{$key}" . " $defaults -DVERSION_$packagename=\"$v\"";
			}
			else
			{
				$main::config{$key} = "-I$main::config{$key}" . " $defaults -DVERSION_$packagename=\"0.0\"";
			}
			$main::config{$key} =~ s/^\s+//g;
			$ret = $main::config{$key};
			return $ret;
		}
	}
	else
	{
		chomp($v);
		my $key = "default_includedir_$packagename";
		$packagename =~ tr/a-z/A-Z/;
		$main::config{$key} = "$ret -DVERSION_$packagename=\"$v\"";
		$main::config{$key} =~ s/^\s+//g;
		$ret = $main::config{$key};
		print "\e[1;32m$ret\e[0m (version $v)\n";
	}
	$ret =~ s/^\s+//g;
	return $ret;
}

sub pkgconfig_check_version($$;$)
{
	my ($packagename, $version, $module) = @_;

	extend_pkg_path();

	print "Checking version of package \e[1;32m$packagename\e[0m is >= \e[1;32m$version\e[0m... ";

	my $v = `pkg-config --modversion $packagename 2>/dev/null`;
	if (defined $v)
	{
		chomp($v);
	}
	if ((defined $v) && ($v ne ""))
	{
		if (!system "pkg-config --atleast-version $version $packagename")
		{
			print "\e[1;32mYes (version $v)\e[0m\n";
			return 1;
		}
		else
		{
			print "\e[1;32mNo (version $v)\e[0m\n";
			return 0;
		}
	}
	# If we didnt find it, we  cant definitively say its too old.
	# Return ok, and let pkgconflibs() or pkgconfincludes() pick up
	# the missing library later on.
	print "\e[1;32mNo (not found)\e[0m\n";
	return 1;
}

sub pkgconfig_get_lib_dirs($$$;$)
{
	my ($packagename, $libname, $defaults, $module) = @_;

	my $key = "default_libdir_$packagename";
	if (exists $main::config{$key})
	{
		print "Locating library directory for package \e[1;32m$packagename\e[0m for module \e[1;32m$module\e[0m... ";
		my $ret = $main::config{$key};
		print "\e[1;32m$ret\e[0m (cached)\n";
		return $ret;
	}

	extend_pkg_path();

	print "Locating library directory for package \e[1;32m$packagename\e[0m for module \e[1;32m$module\e[0m... ";

	my $v = `pkg-config --modversion $packagename 2>/dev/null`;
	my $ret = `pkg-config --libs $packagename 2>/dev/null`;

	my $foo = "";
	if ((!defined $v) || ($v eq ""))
	{
		$foo = `locate "$libname" | head -n 1`;
		$foo =~ /(.+)\Q$libname\E/;
		my $find = $1;
		chomp($find);
		if ((defined $find) && ($find ne "") && ($find ne $packagename))
		{
			print "(\e[1;32mFound via search\e[0m) ";
			$foo = "-L$1";
		}
		else
		{
			$foo = " ";
			undef $v;
		}
		$ret = "$foo";
	}

	if (($defaults ne "") && (($ret eq "") || (!defined $ret)))
	{
		$ret = "$foo " . $defaults;
	}
	chomp($ret);
	if ((($ret eq " ") || (!defined $ret)) && ((!defined $v) || ($v eq "")))
	{
		my $key = "default_libdir_$packagename";
		if (exists $main::config{$key})
		{
			$ret = $main::config{$key};
		}
		else
		{
			$libname =~ s/^\///;
			promptstring("path to the directory containing $libname", $key, "/usr/lib",$packagename,"$packagename-libs");
			$main::config{$key} = "-L$main::config{$key}" . " $defaults";
			$main::config{$key} =~ s/^\s+//g;
			$ret = $main::config{$key};
			return $ret;
		}
	}
	else
	{
		chomp($v);
		print "\e[1;32m$ret\e[0m (version $v)\n";
		my $key = "default_libdir_$packagename";
		$main::config{$key} = $ret;
		$main::config{$key} =~ s/^\s+//g;
		$ret =~ s/^\s+//g;
	}
	$ret =~ s/^\s+//g;
	return $ret;
}

# Translate a $CompileFlags etc line and parse out function calls
# to functions within these modules at configure time.
sub translate_functions($$)
{
	my ($line,$module) = @_;

	eval
	{
		$module =~ /modules*\/(.+?)$/;
		$module = $1;

		# This is only a cursory check, just designed to catch casual accidental use of backticks.
		# There are pleanty of ways around it, but its not supposed to be for security, just checking
		# that people are using the new configuration api as theyre supposed to and not just using
		# backticks instead of eval(), being as eval has accountability. People wanting to get around
		# the accountability will do so anyway.
		if (($line =~ /`/) && ($line !~ /eval\(.+?`.+?\)/))
		{
			die "Developers should no longer use backticks in configuration macros. Please use exec() and eval() macros instead. Offending line: $line (In module: $module)";
		}

		if ($line =~ /ifuname\(\!"(\w+)"\)/)
		{
			my $uname = $1;
			if ($uname eq $^O)
			{
				$line = "";
				return "";
			}

			$line =~ s/ifuname\(\!"(.+?)"\)//;
		}

		if ($line =~ /ifuname\("(\w+)"\)/)
		{
			my $uname = $1;
			if ($uname ne $^O)
			{
				$line = "";
				return "";
			}

			$line =~ s/ifuname\("(.+?)"\)//;
		}

		if ($line =~ /if\("(\w+)"\)/)
		{
			if (defined $main::config{$1})
			{
				if (($main::config{$1} !~ /y/i) and ($main::config{$1} ne "1"))
				{
					$line = "";
					return "";
				}
			}

			$line =~ s/if\("(.+?)"\)//;
		}
		if ($line =~ /if\(\!"(\w+)"\)/)
		{
			if (!exists $main::config{$1})
			{
				$line = "";
				return "";
			}
			else
			{
				if (defined $1)
				{
					if (exists ($main::config{$1}) and (($main::config{$1} =~ /y/i) or ($main::config{$1} eq "1")))
					{
						$line = "";
						return "";
					}
				}
			}

			$line =~ s/if\(\!"(.+?)"\)//;
		}
		while ($line =~ /exec\("(.+?)"\)/)
		{
			print "Executing program for module \e[1;32m$module\e[0m ... \e[1;32m$1\e[0m\n";
			my $replace = `$1`;
			die $replace if ($replace =~ /Configuration failed/);
			chomp($replace);
			$line =~ s/exec\("(.+?)"\)/$replace/;
		}
		while ($line =~ /execruntime\("(.+?)"\)/)
		{
			$line =~ s/execruntime\("(.+?)"\)/`$1`/;
		}
		while ($line =~ /eval\("(.+?)"\)/)
		{
			print "Evaluating perl code for module \e[1;32m$module\e[0m ... ";
			my $tmpfile;
			do
			{
				$tmpfile = tmpnam();
			} until sysopen(TF, $tmpfile, O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW, 0700);
			print "(Created and executed \e[1;32m$tmpfile\e[0m)\n";
			print TF $1;
			close TF;
			my $replace = `perl $tmpfile`;
			chomp($replace);
			$line =~ s/eval\("(.+?)"\)/$replace/;
		}
		while ($line =~ /pkgconflibs\("(.+?)","(.+?)","(.+?)"\)/)
		{
			my $replace = pkgconfig_get_lib_dirs($1, $2, $3, $module);
			$line =~ s/pkgconflibs\("(.+?)","(.+?)","(.+?)"\)/$replace/;
		}
		while ($line =~ /pkgconfversion\("(.+?)","(.+?)"\)/)
		{
			if (pkgconfig_check_version($1, $2, $module) != 1)
			{
				die "Version of package $1 is too old. Please upgrade it to version \e[1;32m$2\e[0m or greater and try again.";
			}
			# This doesnt actually get replaced with anything
			$line =~ s/pkgconfversion\("(.+?)","(.+?)"\)//;
		}
		while ($line =~ /pkgconflibs\("(.+?)","(.+?)",""\)/)
		{
			my $replace = pkgconfig_get_lib_dirs($1, $2, "", $module);
			$line =~ s/pkgconflibs\("(.+?)","(.+?)",""\)/$replace/;
		}
		while ($line =~ /pkgconfincludes\("(.+?)","(.+?)",""\)/)
		{
			my $replace = pkgconfig_get_include_dirs($1, $2, "", $module);
			$line =~ s/pkgconfincludes\("(.+?)","(.+?)",""\)/$replace/;
		}
		while ($line =~ /pkgconfincludes\("(.+?)","(.+?)","(.+?)"\)/)
		{
			my $replace = pkgconfig_get_include_dirs($1, $2, $3, $module);
			$line =~ s/pkgconfincludes\("(.+?)","(.+?)","(.+?)"\)/$replace/;
		}
		while ($line =~ /rpath\("(.+?)"\)/)
		{
			my $replace = make_rpath($1,$module);
			$line =~ s/rpath\("(.+?)"\)/$replace/;
		}
	};
	if ($@)
	{
		my $err = $@;
		#$err =~ s/at .+? line \d+.*//g;
		print "\n\nConfiguration failed. The following error occured:\n\n$err\n";
		print "\nMake sure you have pkg-config installed\n";
		print "\nIn the case of gnutls configuration errors on debian,\n";
		print "Ubuntu, etc, you should ensure that you have installed\n";
		print "gnutls-bin as well as gnutls-dev and gnutls.\n";
		exit;
	}
	else
	{
		return $line;
	}
}

1;