###################################################
# create C header files for an IDL structure
# Copyright tridge@samba.org 2000
# Copyright jelmer@samba.org 2005
# released under the GNU GPL

package Parse::Pidl::Samba4::Header;

use strict;
use Parse::Pidl::Typelist qw(mapTypeName scalar_is_reference);
use Parse::Pidl::Util qw(has_property is_constant);
use Parse::Pidl::Samba4 qw(is_intree);

use vars qw($VERSION);
$VERSION = '0.01';

my($res);
my($tab_depth);

sub pidl($) { $res .= shift; }

sub tabs()
{
	my $res = "";
	$res .="\t" foreach (1..$tab_depth);
	return $res;
}

#####################################################################
# parse a properties list
sub HeaderProperties($$)
{
	my($props,$ignores) = @_;
	my $ret = "";

	foreach my $d (keys %{$props}) {
		next if (grep(/^$d$/, @$ignores));
		if($props->{$d} ne "1") {
			$ret.= "$d($props->{$d}),";
		} else {
			$ret.="$d,";
		}
	}

	if ($ret) {
		pidl "/* [" . substr($ret, 0, -1) . "] */";
	}
}

#####################################################################
# parse a structure element
sub HeaderElement($)
{
	my($element) = shift;

	pidl tabs();
	if (has_property($element, "represent_as")) {
		pidl mapTypeName($element->{PROPERTIES}->{represent_as})." ";
	} else {
		if (ref($element->{TYPE}) eq "HASH") {
			HeaderType($element, $element->{TYPE}, $element->{TYPE}->{NAME});
		} else {
			HeaderType($element, $element->{TYPE}, "");
		}
		pidl " ";
		my $numstar = $element->{POINTERS};
		if ($numstar >= 1) {
			$numstar-- if (scalar_is_reference($element->{TYPE}));
		}
		foreach (@{$element->{ARRAY_LEN}})
		{
			next if is_constant($_) and 
				not has_property($element, "charset");
			$numstar++;
		}
		pidl "*" foreach (1..$numstar);
	}
	pidl $element->{NAME};
	foreach (@{$element->{ARRAY_LEN}}) {
		next unless (is_constant($_) and 
			not has_property($element, "charset"));
		pidl "[$_]";
	}

	pidl ";";
	if (defined $element->{PROPERTIES}) {
		HeaderProperties($element->{PROPERTIES}, ["in", "out"]);
	}
	pidl "\n";
}

#####################################################################
# parse a struct
sub HeaderStruct($$)
{
	my($struct,$name) = @_;
	pidl "struct $name";
	return if (not defined($struct->{ELEMENTS}));
	pidl " {\n";
	$tab_depth++;
	my $el_count=0;
	foreach (@{$struct->{ELEMENTS}}) {
		HeaderElement($_);
		$el_count++;
	}
	if ($el_count == 0) {
		# some compilers can't handle empty structures
		pidl tabs()."char _empty_;\n";
	}
	$tab_depth--;
	pidl tabs()."}";
	if (defined $struct->{PROPERTIES}) {
		HeaderProperties($struct->{PROPERTIES}, []);
	}
}

#####################################################################
# parse a enum
sub HeaderEnum($$)
{
	my($enum,$name) = @_;
	my $first = 1;

	pidl "#ifndef USE_UINT_ENUMS\n";
	pidl "enum $name {\n";
	$tab_depth++;
	foreach my $e (@{$enum->{ELEMENTS}}) {
		unless ($first) { pidl ",\n"; }
		$first = 0;
		pidl tabs();
		pidl $e;
	}
	pidl "\n";
	$tab_depth--;
	pidl "}\n";
	pidl "#else\n";
	my $count = 0;
	pidl "enum $name { __donnot_use_enum_$name=0x7FFFFFFF}\n";
	my $with_val = 0;
	my $without_val = 0;
	foreach my $e (@{$enum->{ELEMENTS}}) {
		my $t = "$e";
		my $name;
		my $value;
		if ($t =~ /(.*)=(.*)/) {
			$name = $1;
			$value = $2;
			$with_val = 1;
			die ("you can't mix enum member with values and without values when using --uint-enums!")
				unless ($without_val == 0);
		} else {
			$name = $t;
			$value = $count++;
			$without_val = 1;
			die ("you can't mix enum member with values and without values when using --uint-enums!")
				unless ($with_val == 0);
		}
		pidl "#define $name ( $value )\n";
	}
	pidl "#endif\n";
}

#####################################################################
# parse a bitmap
sub HeaderBitmap($$)
{
	my($bitmap,$name) = @_;

	pidl "/* bitmap $name */\n";
	pidl "#define $_\n" foreach (@{$bitmap->{ELEMENTS}});
	pidl "\n";
}

#####################################################################
# parse a union
sub HeaderUnion($$)
{
	my($union,$name) = @_;
	my %done = ();

	pidl "union $name";
	return if (not defined($union->{ELEMENTS}));
	pidl " {\n";
	$tab_depth++;
	foreach my $e (@{$union->{ELEMENTS}}) {
		if ($e->{TYPE} ne "EMPTY") {
			if (! defined $done{$e->{NAME}}) {
				HeaderElement($e);
			}
			$done{$e->{NAME}} = 1;
		}
	}
	$tab_depth--;
	pidl "}";

	if (defined $union->{PROPERTIES}) {
		HeaderProperties($union->{PROPERTIES}, []);
	}
}

#####################################################################
# parse a type
sub HeaderType($$$)
{
	my($e,$data,$name) = @_;
	if (ref($data) eq "HASH") {
		($data->{TYPE} eq "ENUM") && HeaderEnum($data, $name);
		($data->{TYPE} eq "BITMAP") && HeaderBitmap($data, $name);
		($data->{TYPE} eq "STRUCT") && HeaderStruct($data, $name);
		($data->{TYPE} eq "UNION") && HeaderUnion($data, $name);
		return;
	}

	if (has_property($e, "charset")) {
		pidl "const char";
	} else {
		pidl mapTypeName($e->{TYPE});
	}
}

#####################################################################
# parse a typedef
sub HeaderTypedef($)
{
	my($typedef) = shift;
	HeaderType($typedef, $typedef->{DATA}, $typedef->{NAME});
}

#####################################################################
# parse a const
sub HeaderConst($)
{
	my($const) = shift;
	if (!defined($const->{ARRAY_LEN}[0])) {
		pidl "#define $const->{NAME}\t( $const->{VALUE} )\n";
	} else {
		pidl "#define $const->{NAME}\t $const->{VALUE}\n";
	}
}

sub ElementDirection($)
{
	my ($e) = @_;

	return "inout" if (has_property($e, "in") and has_property($e, "out"));
	return "in" if (has_property($e, "in"));
	return "out" if (has_property($e, "out"));
	return "inout";
}

#####################################################################
# parse a function
sub HeaderFunctionInOut($$)
{
	my($fn,$prop) = @_;

	foreach (@{$fn->{ELEMENTS}}) {
		HeaderElement($_) if (ElementDirection($_) eq $prop);
	}
}

#####################################################################
# determine if we need an "in" or "out" section
sub HeaderFunctionInOut_needed($$)
{
	my($fn,$prop) = @_;

	return 1 if ($prop eq "out" && $fn->{RETURN_TYPE} ne "void");

	foreach (@{$fn->{ELEMENTS}}) {
		return 1 if (ElementDirection($_) eq $prop);
	}

	return undef;
}

my %headerstructs;

#####################################################################
# parse a function
sub HeaderFunction($)
{
	my($fn) = shift;

	return if ($headerstructs{$fn->{NAME}});

	$headerstructs{$fn->{NAME}} = 1;

	pidl "\nstruct $fn->{NAME} {\n";
	$tab_depth++;
	my $needed = 0;

	if (HeaderFunctionInOut_needed($fn->{ORIGINAL}, "in") or
	    HeaderFunctionInOut_needed($fn->{ORIGINAL}, "inout")) {
		pidl tabs()."struct {\n";
		$tab_depth++;
		HeaderFunctionInOut($fn->{ORIGINAL}, "in");
		HeaderFunctionInOut($fn->{ORIGINAL}, "inout");
		$tab_depth--;
		pidl tabs()."} in;\n\n";
		$needed++;
	}

	if (HeaderFunctionInOut_needed($fn->{ORIGINAL}, "out") or
	    HeaderFunctionInOut_needed($fn->{ORIGINAL}, "inout")) {
		pidl tabs()."struct {\n";
		$tab_depth++;
		HeaderFunctionInOut($fn->{ORIGINAL}, "out");
		HeaderFunctionInOut($fn->{ORIGINAL}, "inout");
		if (defined($fn->{RETURN_TYPE})) {
			pidl tabs().mapTypeName($fn->{RETURN_TYPE}) . " result;\n";
		}
		$tab_depth--;
		pidl tabs()."} out;\n\n";
		$needed++;
	}

	if (!$needed) {
		# sigh - some compilers don't like empty structures
		pidl tabs()."int _dummy_element;\n";
	}

	$tab_depth--;
	pidl "};\n\n";
}

sub HeaderImport
{
	my @imports = @_;
	foreach (@imports) {
		s/\.idl\"$//;
		s/^\"//;
		pidl "#include \"librpc/gen_ndr/$_\.h\"\n";
	}
}

sub HeaderInclude
{
	my @includes = @_;
	foreach (@includes) {
		pidl "#include $_\n";
	}
}

#####################################################################
# parse the interface definitions
sub HeaderInterface($)
{
	my($interface) = shift;

	pidl "#ifndef _HEADER_$interface->{NAME}\n";
	pidl "#define _HEADER_$interface->{NAME}\n\n";

	foreach my $d (@{$interface->{CONSTS}}) {
		HeaderConst($d);
	}

	foreach my $d (@{$interface->{TYPES}}) {
		HeaderTypedef($d->{ORIGINAL}) if ($d->{TYPE} eq "TYPEDEF");
		HeaderStruct($d->{ORIGINAL}, $d->{NAME}) if ($d->{TYPE} eq "STRUCT");
		HeaderUnion($d->{ORIGINAL}, $d->{NAME}) if ($d->{TYPE} eq "UNION");
		HeaderEnum($d->{ORIGINAL}, $d->{NAME}) if ($d->{TYPE} eq "ENUM");
		HeaderBitmap($d->{ORIGINAL}, $d->{NAME}) if ($d->{TYPE} eq "BITMAP");
		pidl ";\n\n" if ($d->{TYPE} eq "BITMAP" or 
				 $d->{TYPE} eq "STRUCT" or 
				 $d->{TYPE} eq "TYPEDEF" or 
				 $d->{TYPE} eq "UNION" or 
				 $d->{TYPE} eq "ENUM");
	}

	foreach my $fn (@{$interface->{FUNCTIONS}}) {
		HeaderFunction($fn);
	}

	pidl "#endif /* _HEADER_$interface->{NAME} */\n";
}

#####################################################################
# parse a parsed IDL into a C header
sub Parse($)
{
	my($ndr) = shift;
	$tab_depth = 0;

	$res = "";
	%headerstructs = ();
	pidl "/* header auto-generated by pidl */\n\n";
	if (!is_intree()) {
		pidl "#include <core.h>\n";
	}
	pidl "#include <stdint.h>\n";
	pidl "\n";

	foreach (@{$ndr}) {
		($_->{TYPE} eq "INTERFACE") && HeaderInterface($_);
		($_->{TYPE} eq "IMPORT") && HeaderImport(@{$_->{PATHS}});
		($_->{TYPE} eq "INCLUDE") && HeaderInclude(@{$_->{PATHS}});
	}

	return $res;
}

1;