/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2017-8 rubenwardy <rw@rubenwardy.com>
Copyright (C) 2017 raymoo

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "lua_api/l_itemstackmeta.h"
#include "lua_api/l_internal.h"
#include "common/c_content.h"

/*
	NodeMetaRef
*/
ItemStackMetaRef* ItemStackMetaRef::checkobject(lua_State *L, int narg)
{
	luaL_checktype(L, narg, LUA_TUSERDATA);
	void *ud = luaL_checkudata(L, narg, className);
	if (!ud)
		luaL_typerror(L, narg, className);

	return *(ItemStackMetaRef**)ud;  // unbox pointer
}

Metadata* ItemStackMetaRef::getmeta(bool auto_create)
{
	return &istack->metadata;
}

void ItemStackMetaRef::clearMeta()
{
	istack->metadata.clear();
}

void ItemStackMetaRef::reportMetadataChange()
{
	// TODO
}

// Exported functions
int ItemStackMetaRef::l_set_tool_capabilities(lua_State *L)
{
	ItemStackMetaRef *metaref = checkobject(L, 1);
	if (lua_isnoneornil(L, 2)) {
		metaref->clearToolCapabilities();
	} else if (lua_istable(L, 2)) {
		ToolCapabilities caps = read_tool_capabilities(L, 2);
		metaref->setToolCapabilities(caps);
	} else {
		luaL_typerror(L, 2, "table or nil");
	}

	return 0;
}

// garbage collector
int ItemStackMetaRef::gc_object(lua_State *L) {
	ItemStackMetaRef *o = *(ItemStackMetaRef **)(lua_touserdata(L, 1));
	delete o;
	return 0;
}

// Creates an NodeMetaRef and leaves it on top of stack
// Not callable from Lua; all references are created on the C side.
void ItemStackMetaRef::create(lua_State *L, ItemStack *istack)
{
	ItemStackMetaRef *o = new ItemStackMetaRef(istack);
	//infostream<<"NodeMetaRef::create: o="<<o<<std::endl;
	*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
	luaL_getmetatable(L, className);
	lua_setmetatable(L, -2);
}

void ItemStackMetaRef::Register(lua_State *L)
{
	lua_newtable(L);
	int methodtable = lua_gettop(L);
	luaL_newmetatable(L, className);
	int metatable = lua_gettop(L);

	lua_pushliteral(L, "__metatable");
	lua_pushvalue(L, methodtable);
	lua_settable(L, metatable);  // hide metatable from Lua getmetatable()

	lua_pushliteral(L, "metadata_class");
	lua_pushlstring(L, className, strlen(className));
	lua_settable(L, metatable);

	lua_pushliteral(L, "__index");
	lua_pushvalue(L, methodtable);
	lua_settable(L, metatable);

	lua_pushliteral(L, "__gc");
	lua_pushcfunction(L, gc_object);
	lua_settable(L, metatable);

	lua_pushliteral(L, "__eq");
	lua_pushcfunction(L, l_equals);
	lua_settable(L, metatable);

	lua_pop(L, 1);  // drop metatable

	luaL_openlib(L, 0, methods, 0);  // fill methodtable
	lua_pop(L, 1);  // drop methodtable

	// Cannot be created from Lua
	//lua_register(L, className, create_object);
}

const char ItemStackMetaRef::className[] = "ItemStackMetaRef";
const luaL_Reg ItemStackMetaRef::methods[] = {
	luamethod(MetaDataRef, contains),
	luamethod(MetaDataRef, get),
	luamethod(MetaDataRef, get_string),
	luamethod(MetaDataRef, set_string),
	luamethod(MetaDataRef, get_int),
	luamethod(MetaDataRef, set_int),
	luamethod(MetaDataRef, get_float),
	luamethod(MetaDataRef, set_float),
	luamethod(MetaDataRef, to_table),
	luamethod(MetaDataRef, from_table),
	luamethod(MetaDataRef, equals),
	luamethod(ItemStackMetaRef, set_tool_capabilities),
	{0,0}
};
