#
# Awk script to automatically generate the code needed
# to export the AI API to Squirrel.
#
# Note that arrays are 1 based...
#

# Simple insertion sort.
function array_sort(ARRAY, ELEMENTS, temp, i, j) {
	for (i = 2; i <= ELEMENTS; i++)
		for (j = i; ARRAY[j - 1] > ARRAY[j]; --j) {
			temp = ARRAY[j]
			ARRAY[j] = ARRAY[j - 1]
			ARRAY[j - 1] = temp
	}
	return
}

function dump_class_templates(name) {
	print "	template <> "       name " *GetParam(ForceType<"       name " *>, HSQUIRRELVM vm, int index) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return  (" name " *)instance; }"
	print "	template <> "       name " &GetParam(ForceType<"       name " &>, HSQUIRRELVM vm, int index) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return *(" name " *)instance; }"
	print "	template <> const " name " *GetParam(ForceType<const " name " *>, HSQUIRRELVM vm, int index) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return  (" name " *)instance; }"
	print "	template <> const " name " &GetParam(ForceType<const " name " &>, HSQUIRRELVM vm, int index) { SQUserPointer instance; sq_getinstanceup(vm, index, &instance, 0); return *(" name " *)instance; }"
	print "	template <> int Return<" name " *>(HSQUIRRELVM vm, " name " *res) { HSQOBJECT instance; Squirrel::CreateClassInstanceVM(vm, \"" name "\", res, &instance); sq_pushobject(vm, instance); return 1; }"
}

BEGIN {
	enum_size = 0
	enum_value_size = 0
	struct_size = 0
	method_size = 0
	static_method_size = 0
	virtual_class = "false"
	super_cls = ""
	cls = ""
	start_squirrel_define_on_next_line = "false"
	cls_level = 0
}

/@file/ {
	print "#include \"" $3 "\""
}

# Remove the old squirrel stuff
/#ifdef DEFINE_SQUIRREL_CLASS/ { squirrel_stuff = "true";  next; }
/^#endif \/\* DEFINE_SQUIRREL_CLASS \*\// { if (squirrel_stuff == "true") { squirrel_stuff = "false"; next; } }
{ if (squirrel_stuff == "true") next; }

# Ignore forward declarations of classes
/^(	*)class(.*);/ { next; }
# We only want to have public functions exported for now
/^(	*)class/     {
	if (cls_level == 0) {
		public = "false"
		cls_param[0] = ""
		cls_param[1] = 1
		cls_param[2] = "x"
		cls = $2
		if (match($4, "public") || match($4, "protected") || match($4, "private")) {
			super_cls = $5
		} else {
			super_cls = $4
		}
	} else if (cls_level == 1) {
		struct_size++
		structs[struct_size] = cls "::" $2
	}
	cls_level++
	next
}
/^(	*)public/    { if (cls_level == 1) public = "true";  next; }
/^(	*)protected/ { if (cls_level == 1) public = "false"; next; }
/^(	*)private/   { if (cls_level == 1) public = "false"; next; }

# Ignore the comments
/^#/             { next; }
/\/\*.*\*\//     { comment = "false"; next; }
/\/\*/           { comment = "true";  next; }
/\*\//           { comment = "false"; next; }
{ if (comment == "true") next }

# We need to make specialized conversions for structs
/^(	*)struct/ {
	cls_level++
	if (public == "false") next
	if (cls_level != 1) next
	struct_size++
	structs[struct_size] = cls "::" $2
	next
}

# We need to make specialized conversions for enums
/^(	*)enum/ {
	cls_level++
	if (public == "false") next;
	in_enum = "true"
	enum_size++
	enums[enum_size] = cls "::" $2
	next
}

# Maybe the end of the class, if so we can start with the Squirrel export pretty soon
/};/ {
	cls_level--
	if (cls_level != 0) {
		in_enum = "false";
		next;
	}
	if (cls == "") {
		next;
	}
	start_squirrel_define_on_next_line = "true"
	next;
}

# Empty/white lines. When we may do the Squirrel export, do that export.
/^([ 	]*)$/ {
	if (start_squirrel_define_on_next_line == "false") next
	spaces = "                                                               ";
	public = "false"
	namespace_opened = "false"

	print ""

	# First check whether we have enums to print
	if (enum_size != 0) {
		if (namespace_opened == "false") {
			print "namespace SQConvert {"
			namespace_opened = "true"
		}
		print "	/* Allow enums to be used as Squirrel parameters */"
		for (i = 1; i <= enum_size; i++) {
			print "	template <> " enums[i] " GetParam(ForceType<" enums[i] ">, HSQUIRRELVM vm, int index) { SQInteger tmp; sq_getinteger(vm, index, &tmp); return (" enums[i] ")tmp; }"
			print "	template <> int Return<" enums[i] ">(HSQUIRRELVM vm, " enums[i] " res) { sq_pushinteger(vm, (int32)res); return 1; }"
			delete enums[i]
		}
	}

	# Then check whether we have structs/classes to print
	if (struct_size != 0) {
		if (namespace_opened == "false") {
			print "namespace SQConvert {"
			namespace_opened = "true"
		}
		print "	/* Allow inner classes/structs to be used as Squirrel parameters */"
		for (i = 1; i <= struct_size; i++) {
			dump_class_templates(structs[i])
			delete structs[i]
		}
	}

	if (namespace_opened == "false") {
		print "namespace SQConvert {"
		namespace_opened = "true"
	} else {
		print ""
	}
	print "	/* Allow " cls " to be used as Squirrel parameter */"
	dump_class_templates(cls)

	print "}; // namespace SQConvert"

	print "";
	# Then do the registration functions of the class. */
	print "void SQ" cls "Register(Squirrel *engine) {"
	print "	DefSQClass <" cls "> SQ" cls "(\"" cls "\");"
	if (super_cls == "AIObject" || super_cls == "AIAbstractList::Valuator") {
		print "	SQ" cls ".PreRegister(engine);"
	} else {
		print "	SQ" cls ".PreRegister(engine, \"" super_cls "\");"
	}
	if (virtual_class == "false") {
		print "	SQ" cls ".AddConstructor<void (" cls "::*)(" cls_param[0] "), " cls_param[1]">(engine, \"" cls_param[2] "\");"
	}
	print ""

	# Enum values
	mlen = 0
	for (i = 1; i <= enum_value_size; i++) {
		if (mlen <= length(enum_value[i])) mlen = length(enum_value[i])
	}
	for (i = 1; i <= enum_value_size; i++) {
		print "	SQ" cls ".DefSQConst(engine, " cls "::" enum_value[i] ", " substr(spaces, 1, mlen - length(enum_value[i])) "\""  enum_value[i] "\");"
		delete enum_value[i]
	}
	if (enum_value_size != 0) print ""

	# Static methods
	mlen = 0
	for (i = 1; i <= static_method_size; i++) {
		if (mlen <= length(static_methods[i, 0])) mlen = length(static_methods[i, 0])
	}
	for (i = 1; i <= static_method_size; i++) {
		print "	SQ" cls ".DefSQStaticMethod(engine, &" cls "::" static_methods[i, 0] ", " substr(spaces, 1, mlen - length(static_methods[i, 0])) "\""  static_methods[i, 0] "\", " substr(spaces, 1, mlen - length(static_methods[i, 0])) "" static_methods[i, 1] ", \"" static_methods[i, 2] "\");"
		delete static_methods[i]
	}
	if (static_method_size != 0) print ""

	if (virtual_class == "false") {
		# Non-static methods
		mlen = 0
		for (i = 1; i <= method_size; i++) {
			if (mlen <= length(methods[i, 0])) mlen = length(methods[i, 0])
		}
		for (i = 1; i <= method_size; i++) {
			print "	SQ" cls ".DefSQMethod(engine, &" cls "::" methods[i, 0] ", " substr(spaces, 1, mlen - length(methods[i, 0])) "\""  methods[i, 0] "\", " substr(spaces, 1, mlen - length(methods[i, 0])) "" methods[i, 1] ", \"" methods[i, 2] "\");"
			delete methods[i]
		}
		if (method_size != 0) print ""
	}
	print "	SQ" cls ".PostRegister(engine);"
	print "}"

	enum_size = 0
	enum_value_size = 0
	struct_size = 0
	method_size = 0
	static_method_size = 0
	virtual_class = "false"
	cls = ""
	start_squirrel_define_on_next_line = "false"
	cls_level = 0
}

# Skip non-public functions
{ if (public == "false") next }

# Add enums
{
	if (in_enum == "true") {
		enum_value_size++
		enum_value[enum_value_size] = $1
		next
	}
}

# Add a method to the list
/^.*\(.*\).*$/ {
	if (cls_level != 1) next
	if (match($0, "~")) next

	is_static = match($0, "static")
	if (match($0, "virtual")) {
		virtual_class = "true"
	}
	gsub("virtual", "", $0)
	gsub("static", "", $0)
	gsub("const", "", $0)
	param_s = $0
	gsub("\\*", "", $0)
	gsub("\\(.*", "", $0)

	sub(".*\\(", "", param_s)
	sub("\\).*", "", param_s)

	funcname = $2
	if ($1 == cls) {
		cls_param[0] = param_s
		if (param_s == "") next
	} else if (funcname == "") next

	split(param_s, params, ",")
	types = "x"
	for (len = 1; params[len] != ""; len++) {
		sub("^[ 	]*", "", params[len])
		if (match(params[len], "\\*") || match(params[len], "&")) {
			if (match(params[len], "^char")) {
				types = types "s"
			} else if (match(params[len], "^void")) {
				types = types "p"
			} else {
				types = types "x"
			}
		} else if (match(params[len], "^bool")) {
			types = types "b"
		} else {
			types = types "i"
		}
	}

	if ($1 == cls) {
		cls_param[1] = len;
		cls_param[2] = types;
	} else if (is_static) {
		static_method_size++
		static_methods[static_method_size, 0] = funcname
		static_methods[static_method_size, 1] = len
		static_methods[static_method_size, 2] = types
	} else {
		method_size++
		methods[method_size, 0] = funcname
		methods[method_size, 1] = len
		methods[method_size, 2] = types
	}
	next
}