#!/usr/bin/perl
use FindBin;
use lib "$FindBin::Bin";
use strict;
use metadata;

my %board;

sub confstr($) {
	my $conf = shift;
	$conf =~ tr#/\.\-/#___#;
	return $conf;
}

sub parse_target_metadata() {
	my $file = shift @ARGV;
	my ($target, @target, $profile);
	my %target;

	open FILE, "<$file" or do {
		warn "Can't open file '$file': $!\n";
		return;
	};
	while (<FILE>) {
		chomp;
		/^Target:\s*(.+)\s*$/ and do {
			my $name = $1;
			$target = {
				id => $name,
				board => $name,
				boardconf => confstr($name),
				conf => confstr($name),
				profiles => [],
				features => [],
				depends => [],
				subtargets => []
			};
			push @target, $target;
			$target{$name} = $target;
			if ($name =~ /([^\/]+)\/([^\/]+)/) {
				push @{$target{$1}->{subtargets}}, $2;
				$target->{board} = $1;
				$target->{boardconf} = confstr($1);
				$target->{subtarget} = 1;
				$target->{parent} = $target{$1};
			}
		};
		/^Target-Kernel:\s*(\d+\.\d+)\s*$/ and $target->{kernel} = $1;
		/^Target-Name:\s*(.+)\s*$/ and $target->{name} = $1;
		/^Target-Path:\s*(.+)\s*$/ and $target->{path} = $1;
		/^Target-Arch:\s*(.+)\s*$/ and $target->{arch} = $1;
		/^Target-Features:\s*(.+)\s*$/ and $target->{features} = [ split(/\s+/, $1) ];
		/^Target-Depends:\s*(.+)\s*$/ and $target->{depends} = [ split(/\s+/, $1) ];
		/^Target-Description:/ and $target->{desc} = get_multiline(*FILE);
		/^Linux-Version:\s*(.+)\s*$/ and $target->{version} = $1;
		/^Linux-Release:\s*(.+)\s*$/ and $target->{release} = $1;
		/^Linux-Kernel-Arch:\s*(.+)\s*$/ and $target->{karch} = $1;
		/^Default-Packages:\s*(.+)\s*$/ and $target->{packages} = [ split(/\s+/, $1) ];
		/^Target-Profile:\s*(.+)\s*$/ and do {
			$profile = {
				id => $1,
				name => $1,
				packages => []
			};
			push @{$target->{profiles}}, $profile;
		};
		/^Target-Profile-Name:\s*(.+)\s*$/ and $profile->{name} = $1;
		/^Target-Profile-Packages:\s*(.*)\s*$/ and $profile->{packages} = [ split(/\s+/, $1) ];
		/^Target-Profile-Description:\s*(.*)\s*/ and $profile->{desc} = get_multiline(*FILE);
		/^Target-Profile-Config:/ and $profile->{config} = get_multiline(*FILE, "\t");
		/^Target-Profile-Kconfig:/ and $profile->{kconfig} = 1;
	}
	close FILE;
	foreach my $target (@target) {
		next if @{$target->{subtargets}} > 0;
		@{$target->{profiles}} > 0 or $target->{profiles} = [
			{
				id => 'Default',
				name => 'Default',
				packages => []
			}
		];
	}
	return @target;
}

sub gen_kconfig_overrides() {
	my %config;
	my %kconfig;
	my $package;
	my $pkginfo = shift @ARGV;
	my $cfgfile = shift @ARGV;

	# parameter 2: build system config
	open FILE, "<$cfgfile" or return;
	while (<FILE>) {
		/^(CONFIG_.+?)=(.+)$/ and $config{$1} = 1;
	}
	close FILE;

	# parameter 1: package metadata
	open FILE, "<$pkginfo" or return;
	while (<FILE>) {
		/^Package:\s*(.+?)\s*$/ and $package = $1;
		/^Kernel-Config:\s*(.+?)\s*$/ and do {
			my @config = split /\s+/, $1;
			foreach my $config (@config) {
				my $val = 'm';
				my $override;
				if ($config =~ /^(.+?)=(.+)$/) {
					$config = $1;
					$override = 1;
					$val = $2;
				}
				if ($config{"CONFIG_PACKAGE_$package"} and ($config ne 'n')) {
					$kconfig{$config} = $val;
				} elsif (!$override) {
					$kconfig{$config} or $kconfig{$config} = 'n';
				}
			}
		};
	};
	close FILE;

	foreach my $kconfig (sort keys %kconfig) {
		if ($kconfig{$kconfig} eq 'n') {
			print "# $kconfig is not set\n";
		} else {
			print "$kconfig=$kconfig{$kconfig}\n";
		}
	}
}

sub merge_package_lists($$) {
	my $list1 = shift;
	my $list2 = shift;
	my @l = ();
	my %pkgs;

	foreach my $pkg (@$list1, @$list2) {
		$pkgs{$pkg} = 1;
	}
	foreach my $pkg (keys %pkgs) {
		push @l, $pkg unless ($pkg =~ /^-/ or $pkgs{"-$pkg"});
	}
	return sort(@l);
}

sub target_config_features(@) {
	my $ret;

	while ($_ = shift @_) {
		/broken/ and $ret .= "\tdepends BROKEN\n";
		/display/ and $ret .= "\tselect DISPLAY_SUPPORT\n";
		/pci/ and $ret .= "\tselect PCI_SUPPORT\n";
		/usb/ and $ret .= "\tselect USB_SUPPORT\n";
		/pcmcia/ and $ret .= "\tselect PCMCIA_SUPPORT\n";
		/squashfs/ and $ret .= "\tselect USES_SQUASHFS\n";
		/jffs2/ and $ret .= "\tselect USES_JFFS2\n";
		/ext2/ and $ret .= "\tselect USES_EXT2\n";
		/tgz/ and $ret .= "\tselect USES_TGZ\n";
		/cpiogz/ and $ret .= "\tselect USES_CPIOGZ\n";
	}
	return $ret;
}

sub target_name($) {
	my $target = shift;
	my $parent = $target->{parent};
	if ($parent) {
		return $target->{parent}->{name}." - ".$target->{name};
	} else {
		return $target->{name};
	}
}

sub kver($) {
	my $v = shift;
	$v =~ tr/\./_/;
	$v =~ /(\d+_\d+_\d+)(_\d+)?/ and $v = $1;
	return $v;
}

sub print_target($) {
	my $target = shift;
	my $features = target_config_features(@{$target->{features}});
	my $help = $target->{desc};
	my $kernel = $target->{kernel};
	my $confstr;
	$kernel =~ tr/./_/;

	chomp $features;
	$features .= "\n";
	if ($help =~ /\w+/) {
		$help =~ s/^\s*/\t  /mg;
		$help = "\thelp\n$help";
	} else {
		undef $help;
	}

	my $v = kver($target->{version});
	$confstr = <<EOF;
config TARGET_$target->{conf}
	bool "$target->{name}"
	select LINUX_$kernel
	select LINUX_$v
EOF
	if ($target->{subtarget}) {
		$confstr .= "\tdepends TARGET_$target->{boardconf}\n";
	}
	if (@{$target->{subtargets}} > 0) {
		$confstr .= "\tselect HAS_SUBTARGETS\n";
	} else {
		$confstr .= "\tselect $target->{arch}\n";
		foreach my $dep (@{$target->{depends}}) {
			my $mode = "depends";
			my $flags;
			my $name;

			$dep =~ /^([@\+\-]+)(.+)$/;
			$flags = $1;
			$name = $2;

			$flags =~ /-/ and $mode = "deselect";
			$flags =~ /\+/ and $mode = "select";
			$flags =~ /@/ and $confstr .= "\t$mode $name\n";
		}
		$confstr .= $features;
	}

	$confstr .= "$help\n\n";
	print $confstr;
}

sub gen_target_config() {
	my @target = parse_target_metadata();

	my @target_sort = sort {
		target_name($a) cmp target_name($b);
	} @target;


	print <<EOF;
choice
	prompt "Target System"
	default TARGET_brcm_2_4
	reset if !DEVEL
	
EOF

	foreach my $target (@target_sort) {
		next if $target->{subtarget};
		print_target($target);
	}

	print <<EOF;
endchoice

choice
	prompt "Subtarget" if HAS_SUBTARGETS

EOF
	foreach my $target (@target) {
		next unless $target->{subtarget};
		print_target($target);
	}

print <<EOF;
endchoice

choice
	prompt "Target Profile"

EOF

	foreach my $target (@target) {
		my $profiles = $target->{profiles};

		foreach my $profile (@$profiles) {
			print <<EOF;
config TARGET_$target->{conf}_$profile->{id}
	bool "$profile->{name}"
	depends TARGET_$target->{conf}
$profile->{config}
EOF
			$profile->{kconfig} and print "\tselect PROFILE_KCONFIG\n";
			my @pkglist = merge_package_lists($target->{packages}, $profile->{packages});
			foreach my $pkg (@pkglist) {
				print "\tselect DEFAULT_$pkg\n";
			}
			print "\n";
		}
	}

	print <<EOF;
endchoice

config HAS_SUBTARGETS
	bool

config TARGET_BOARD
	string

EOF
	foreach my $target (@target) {
		$target->{subtarget} or	print "\t\tdefault \"".$target->{board}."\" if TARGET_".$target->{conf}."\n";
	}

	my %kver;
	foreach my $target (@target) {
		my $v = kver($target->{version});
		next if $kver{$v};
		$kver{$v} = 1;
		print <<EOF;
config LINUX_$v
	bool
EOF
	}
}

my %dep_check;
sub __find_package_dep($$) {
	my $pkg = shift;
	my $name = shift;
	my $deps = ($pkg->{vdepends} or $pkg->{depends});

	return 0 unless defined $deps;
	foreach my $dep (@{$deps}) {
		next if $dep_check{$dep};
		$dep_check{$dep} = 1;
		return 1 if $dep eq $name;
		return 1 if ($package{$dep} and (__find_package_dep($package{$dep},$name) == 1));
	}
	return 0;
}

# wrapper to avoid infinite recursion
sub find_package_dep($$) {
	my $pkg = shift;
	my $name = shift;

	%dep_check = ();
	return __find_package_dep($pkg, $name);
}

sub package_depends($$) {
	my $a = shift;
	my $b = shift;
	my $ret;

	return 0 if ($a->{submenu} ne $b->{submenu});
	if (find_package_dep($a, $b->{name}) == 1) {
		$ret = 1;
	} elsif (find_package_dep($b, $a->{name}) == 1) {
		$ret = -1;
	} else {
		return 0;
	}
	return $ret;
}

sub mconf_depends($$) {
	my $depends = shift;
	my $only_dep = shift;
	my $res;
	my $dep = shift;
	$dep or $dep = {};

	$depends or return;
	my @depends = @$depends;
	foreach my $depend (@depends) {
		my $m = "depends";
		$depend =~ s/^([@\+]+)//;
		my $flags = $1;
		my $vdep;

		if ($vdep = $package{$depend}->{vdepends}) {
			$depend = join("||", map { "PACKAGE_".$_ } @$vdep);
		} else {
			$flags =~ /\+/ and do {
				next if $only_dep;
				$m = "select";

				# Menuconfig will not treat 'select FOO' as a real dependency
				# thus if FOO depends on other config options, these dependencies
				# will not be checked. To fix this, we simply emit all of FOO's
				# depends here as well.
				$package{$depend} and mconf_depends($package{$depend}->{depends}, 1, $dep);
			};
			$flags =~ /@/ or $depend = "PACKAGE_$depend";
		}
		$dep->{$depend} =~ /select/ or $dep->{$depend} = $m;
	}
	foreach my $depend (keys %$dep) {
		my $m = $dep->{$depend};
		$res .= "\t\t$m $depend\n";
	}
	return $res;
}

sub print_package_config_category($) {
	my $cat = shift;
	my %menus;
	my %menu_dep;

	return unless $category{$cat};

	print "menu \"$cat\"\n\n";
	my %spkg = %{$category{$cat}};

	foreach my $spkg (sort {uc($a) cmp uc($b)} keys %spkg) {
		foreach my $pkg (@{$spkg{$spkg}}) {
			my $menu = $pkg->{submenu};
			if ($menu) {
				$menu_dep{$menu} or $menu_dep{$menu} = $pkg->{submenudep};
			} else {
				$menu = 'undef';
			}
			$menus{$menu} or $menus{$menu} = [];
			push @{$menus{$menu}}, $pkg;
			print "\tconfig DEFAULT_".$pkg->{name}."\n";
			print "\t\tbool\n\n";
		}
	}
	my @menus = sort {
		($a eq 'undef' ?  1 : 0) or
		($b eq 'undef' ? -1 : 0) or
		($a cmp $b)
	} keys %menus;

	foreach my $menu (@menus) {
		my @pkgs = sort {
			package_depends($a, $b) or
			($a->{name} cmp $b->{name})
		} @{$menus{$menu}};
		if ($menu ne 'undef') {
			$menu_dep{$menu} and print "if $menu_dep{$menu}\n";
			print "menu \"$menu\"\n";
		}
		foreach my $pkg (@pkgs) {
			my $title = $pkg->{name};
			my $c = (72 - length($pkg->{name}) - length($pkg->{title}));
			if ($c > 0) {
				$title .= ("." x $c). " ". $pkg->{title};
			}
			print "\t";
			$pkg->{menu} and print "menu";
			print "config PACKAGE_".$pkg->{name}."\n";
			print "\t\t".($pkg->{tristate} ? 'tristate' : 'bool')." \"$title\"\n";
			print "\t\tdefault y if DEFAULT_".$pkg->{name}."\n";
			foreach my $default (split /\s*,\s*/, $pkg->{default}) {
				print "\t\tdefault $default\n";
			}
			print mconf_depends($pkg->{depends}, 0);
			print "\t\thelp\n";
			print $pkg->{description};
			print "\n";

			$pkg->{config} and print $pkg->{config}."\n";
		}
		if ($menu ne 'undef') {
			print "endmenu\n";
			$menu_dep{$menu} and print "endif\n";
		}
	}
	print "endmenu\n\n";

	undef $category{$cat};
}

sub gen_package_config() {
	parse_package_metadata($ARGV[0]) or exit 1;
	print "menuconfig UCI_PRECONFIG\n\tbool \"Image configuration\"\n";
	foreach my $preconfig (keys %preconfig) {
		foreach my $cfg (keys %{$preconfig{$preconfig}}) {
			my $conf = $preconfig{$preconfig}->{$cfg}->{id};
			$conf =~ tr/\.-/__/;
			print <<EOF
	config UCI_PRECONFIG_$conf
		string "$preconfig{$preconfig}->{$cfg}->{label}" if UCI_PRECONFIG
		depends PACKAGE_$preconfig
		default "$preconfig{$preconfig}->{$cfg}->{default}"

EOF
		}
	}
	print_package_config_category 'Base system';
	foreach my $cat (keys %category) {
		print_package_config_category $cat;
	}
}

sub gen_package_mk() {
	my %conf;
	my %dep;
	my $line;

	parse_package_metadata($ARGV[0]) or exit 1;
	foreach my $name (sort {uc($a) cmp uc($b)} keys %package) {
		my $config;
		my $pkg = $package{$name};

		next if defined $pkg->{vdepends};
		if ($ENV{SDK}) {
			$conf{$pkg->{src}} or do {
				$config = 'm';
				$conf{$pkg->{src}} = 1;
			};
		} else {
			$config = "\$(CONFIG_PACKAGE_$name)"
		}
		if ($config) {
			print "package-$config += $pkg->{subdir}$pkg->{src}\n";
			$pkg->{prereq} and print "prereq-$config += $pkg->{subdir}$pkg->{src}\n";
		}

		my $hasdeps = 0;
		my $depline = "";
		foreach my $dep (@{$pkg->{depends}}, @{$pkg->{builddepends}}) {
			next if $dep =~ /@/;
			$dep =~ s/\+//;
			my $idx;
			my $pkg_dep = $package{$dep};
			next if defined $pkg_dep->{vdepends};

			if (defined $pkg_dep->{src}) {
				($pkg->{src} ne $pkg_dep->{src}) and $idx = $pkg_dep->{subdir}.$pkg_dep->{src};
			} elsif (defined($srcpackage{$dep})) {
				$idx = $subdir{$dep}.$dep;
			}
			undef $idx if $idx =~ /^(kernel)|(base-files)$/;
			if ($idx) {
				next if $dep{$pkg->{src}."->".$idx};
				$depline .= " \$(curdir)/$idx/compile";
				$dep{$pkg->{src}."->".$idx} = 1;
			}
		}
		if ($depline) {
			$line .= "\$(curdir)/".$pkg->{subdir}."$pkg->{src}/compile += $depline\n";
		}
	}

	if ($line ne "") {
		print "\n$line";
	}
	foreach my $preconfig (keys %preconfig) {
		my $cmds;
		foreach my $cfg (keys %{$preconfig{$preconfig}}) {
			my $conf = $preconfig{$preconfig}->{$cfg}->{id};
			$conf =~ tr/\.-/__/;
			$cmds .= "\techo \"uci set '$preconfig{$preconfig}->{$cfg}->{id}=\$(subst \",,\$(CONFIG_UCI_PRECONFIG_$conf))'\"; \\\n";
		}
		next unless $cmds;
		print <<EOF

\$(TARGET_DIR)/etc/uci-defaults/$preconfig: FORCE
	( \\
$cmds \\
	) > \$@
	
ifneq (\$(UCI_PRECONFIG)\$(CONFIG_UCI_PRECONFIG),)
  package/preconfig: \$(TARGET_DIR)/etc/uci-defaults/$preconfig
endif
EOF
	}
}


sub parse_command() {
	my $cmd = shift @ARGV;
	for ($cmd) {
		/^target_config$/ and return gen_target_config();
		/^package_mk$/ and return gen_package_mk();
		/^package_config$/ and return gen_package_config();
		/^kconfig/ and return gen_kconfig_overrides();
	}
	print <<EOF
Available Commands:
	$0 target_config [file] 	Target metadata in Kconfig format
	$0 package_mk [file]    	Package metadata in makefile format
	$0 package_config [file] 	Package metadata in Kconfig format
	$0 kconfig [file] [config]	Kernel config overrides

EOF
}

parse_command();