/*
 * neutrino-mp lua to c++ bridge
 *
 * (C) 2013 Stefan Seyfried <seife@tuxboxcvs.slipkontur.de>
 *
 * This program 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; either version 2
 * 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 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/>.
 */

#include <config.h>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <unistd.h>

#include <global.h>
#include <system/settings.h>
#include <gui/widget/msgbox.h>
#include <neutrino.h>

#include "luainstance.h"

struct table_key {
	const char *name;
	long code;
};

struct lua_envexport {
	const char *name;
	table_key *t;
};

static void set_lua_variables(lua_State *L)
{
	/* list of colors, exported e.g. as COL['INFOBAR_SHADOW'] */
	static table_key colorlist[] =
	{
		{ "COLORED_EVENTS_CHANNELLIST",	COL_COLORED_EVENTS_CHANNELLIST },
		{ "COLORED_EVENTS_INFOBAR",	COL_COLORED_EVENTS_INFOBAR },
		{ "INFOBAR_SHADOW",		COL_INFOBAR_SHADOW },
		{ "INFOBAR",			COL_INFOBAR },
		{ "MENUHEAD",			COL_MENUHEAD },
		{ "MENUCONTENT",		COL_MENUCONTENT },
		{ "MENUCONTENTDARK",		COL_MENUCONTENTDARK },
		{ "MENUCONTENTSELECTED",	COL_MENUCONTENTSELECTED },
		{ "MENUCONTENTINACTIVE",	COL_MENUCONTENTINACTIVE },
		{ "BACKGROUND",			COL_BACKGROUND },
		{ NULL, 0 }
	};

	/* font list, the _TYPE_ is redundant, exported e.g. as FONT['MENU'] */
	static table_key fontlist[] =
	{
		{ "MENU",		SNeutrinoSettings::FONT_TYPE_MENU },
		{ "MENU_TITLE",		SNeutrinoSettings::FONT_TYPE_MENU_TITLE },
		{ "MENU_INFO",		SNeutrinoSettings::FONT_TYPE_MENU_INFO },
		{ "EPG_TITLE",		SNeutrinoSettings::FONT_TYPE_EPG_TITLE },
		{ "EPG_INFO1",		SNeutrinoSettings::FONT_TYPE_EPG_INFO1 },
		{ "EPG_INFO2",		SNeutrinoSettings::FONT_TYPE_EPG_INFO2 },
		{ "EPG_DATE",		SNeutrinoSettings::FONT_TYPE_EPG_DATE },
		{ "EVENTLIST_TITLE",	SNeutrinoSettings::FONT_TYPE_EVENTLIST_TITLE },
		{ "EVENTLIST_ITEMLARGE",SNeutrinoSettings::FONT_TYPE_EVENTLIST_ITEMLARGE },
		{ "EVENTLIST_ITEMSMALL",SNeutrinoSettings::FONT_TYPE_EVENTLIST_ITEMSMALL },
		{ "EVENTLIST_DATETIME",	SNeutrinoSettings::FONT_TYPE_EVENTLIST_DATETIME },
		{ "GAMELIST_ITEMLARGE",	SNeutrinoSettings::FONT_TYPE_GAMELIST_ITEMLARGE },
		{ "GAMELIST_ITEMSMALL",	SNeutrinoSettings::FONT_TYPE_GAMELIST_ITEMSMALL },
		{ "CHANNELLIST",	SNeutrinoSettings::FONT_TYPE_CHANNELLIST },
		{ "CHANNELLIST_DESCR",	SNeutrinoSettings::FONT_TYPE_CHANNELLIST_DESCR },
		{ "CHANNELLIST_NUMBER",	SNeutrinoSettings::FONT_TYPE_CHANNELLIST_NUMBER },
		{ "CHANNELLIST_EVENT",	SNeutrinoSettings::FONT_TYPE_CHANNELLIST_EVENT },
		{ "CHANNEL_NUM_ZAP",	SNeutrinoSettings::FONT_TYPE_CHANNEL_NUM_ZAP },
		{ "INFOBAR_NUMBER",	SNeutrinoSettings::FONT_TYPE_INFOBAR_NUMBER },
		{ "INFOBAR_CHANNAME",	SNeutrinoSettings::FONT_TYPE_INFOBAR_CHANNAME },
		{ "INFOBAR_INFO",	SNeutrinoSettings::FONT_TYPE_INFOBAR_INFO },
		{ "INFOBAR_SMALL",	SNeutrinoSettings::FONT_TYPE_INFOBAR_SMALL },
		{ "FILEBROWSER_ITEM",	SNeutrinoSettings::FONT_TYPE_FILEBROWSER_ITEM },
		{ "MENU_HINT",		SNeutrinoSettings::FONT_TYPE_MENU_HINT },
		{ NULL, 0 }
	};

	/* screen offsets, exported as e.g. SCREEN['END_Y'] */
	static table_key screenopts[] =
	{
		{ "OFF_X", g_settings.screen_StartX },
		{ "OFF_Y", g_settings.screen_StartY },
		{ "END_X", g_settings.screen_EndX },
		{ "END_Y", g_settings.screen_EndY },
		{ NULL, 0 }
	};

	/* list of environment variable arrays to be exported */
	static lua_envexport e[] =
	{
		{ "COL",	colorlist },
		{ "SCREEN",	screenopts },
		{ "FONT",	fontlist },
		{ NULL, NULL }
	};

	int i = 0;
	while (e[i].name) {
		int j = 0;
		lua_newtable(L);
		while (e[i].t[j].name) {
			lua_pushstring(L, e[i].t[j].name);
			lua_pushinteger(L, e[i].t[j].code);
			lua_settable(L, -3);
			j++;
		}
		lua_setglobal(L, e[i].name);
		i++;
	}
}

#define DBG printf

#define lua_boxpointer(L, u) \
	(*(void **)(lua_newuserdata(L, sizeof(void *))) = (u))

#define lua_unboxpointer(L, i) \
	(*(void **)(lua_touserdata(L, i)))

const char CLuaInstance::className[] = "neutrino";

CLuaInstance::CLuaInstance()
{
	/* Create the intepreter object.  */
	lua = luaL_newstate();

	/* register standard + custom functions. */
	registerFunctions();
}

CLuaInstance::~CLuaInstance()
{
	if (lua != NULL)
	{
		lua_close(lua);
		lua = NULL;
	}
}

#define SET_VAR1(NAME) \
	lua_pushinteger(lua, NAME); \
	lua_setglobal(lua, #NAME);
#define SET_VAR2(NAME, VALUE) \
	lua_pushinteger(lua, VALUE); \
	lua_setglobal(lua, #NAME);

/* Run the given script. */
void CLuaInstance::runScript(const char *fileName)
{
	// luaL_dofile(lua, fileName);
	/* run the script */
	int status = luaL_loadfile(lua, fileName);
	if (status) {
		fprintf(stderr, "[CLuaInstance::%s] Can't load file: %s\n", __func__, lua_tostring(lua, -1));
		ShowMsg2UTF("Lua script error:", lua_tostring(lua, -1), CMsgBox::mbrBack, CMsgBox::mbBack);
		return;
	}
	set_lua_variables(lua);
	status = lua_pcall(lua, 0, LUA_MULTRET, 0);
	if (status)
	{
		fprintf(stderr, "[CLuaInstance::%s] error in script: %s\n", __func__, lua_tostring(lua, -1));
		ShowMsg2UTF("Lua script error:", lua_tostring(lua, -1), CMsgBox::mbrBack, CMsgBox::mbBack);
	}
}

const luaL_Reg CLuaInstance::methods[] =
{
	{ "PaintBox", CLuaInstance::PaintBox },
	{ "RenderString", CLuaInstance::RenderString },
	{ "PaintIcon", CLuaInstance::PaintIcon },
	{ "GetInput", CLuaInstance::GetInput },
	{ NULL, NULL }
};

/* load basic functions and register our own C callbacks */
void CLuaInstance::registerFunctions()
{
	luaL_openlibs(lua);
	luaopen_table(lua);
	luaopen_io(lua);
	luaopen_string(lua);
	luaopen_math(lua);

	lua_newtable(lua);
	int methodtable = lua_gettop(lua);
	luaL_newmetatable(lua, className);
	int metatable = lua_gettop(lua);
	lua_pushliteral(lua, "__metatable");
	lua_pushvalue(lua, methodtable);
	lua_settable(lua, metatable);

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

	lua_pushliteral(lua, "__gc");
	lua_pushcfunction(lua, GCWindow);
	lua_settable(lua, metatable);

	lua_pop(lua, 1);

	luaL_setfuncs(lua, methods, 0);
	lua_pop(lua, 1);

	lua_register(lua, className, NewWindow);
}

CLuaData *CLuaInstance::CheckData(lua_State *L, int narg)
{
	luaL_checktype(L, narg, LUA_TUSERDATA);
	void *ud = luaL_checkudata(L, narg, className);
	if (!ud)
		fprintf(stderr, "[CLuaInstance::%s] wrong type %p, %d, %s\n", __func__, L, narg, className);
	return *(CLuaData **)ud;  // unbox pointer
}

int CLuaInstance::NewWindow(lua_State *L)
{
	int count = lua_gettop(L);
	int x = g_settings.screen_StartX;
	int y = g_settings.screen_StartY;
	int w = g_settings.screen_EndX - x;
	int h = g_settings.screen_EndY - y;
	CLuaData *D = new CLuaData();
	if (count > 0)
		x = luaL_checkint(L, 1);
	if (count > 1)
		y = luaL_checkint(L, 2);
	if (count > 2)
		w = luaL_checkint(L, 3);
	if (count > 3)
		h = luaL_checkint(L, 4);
	CFBWindow *W = new CFBWindow(x, y, w, h);
	D->fbwin = W;
	D->rcinput = g_RCInput;
	lua_boxpointer(L, D);
	luaL_getmetatable(L, className);
	lua_setmetatable(L, -2);
	return 1;
}

int CLuaInstance::PaintBox(lua_State *L)
{
	DBG("CLuaInstance::%s %d\n", __func__, lua_gettop(L));
	int x, y, w, h;
	unsigned int c;

	CLuaData *W = CheckData(L, 1);
	if (!W || !W->fbwin)
		return 0;
	x = luaL_checkint(L, 2);
	y = luaL_checkint(L, 3);
	w = luaL_checkint(L, 4);
	h = luaL_checkint(L, 5);
	c = luaL_checkint(L, 6);
	/* those checks should be done in CFBWindow instead... */
	if (x < 0)
		x = 0;
	if (y < 0)
		y = 0;
	if (w < 0 || x + w > W->fbwin->dx)
		w = W->fbwin->dx - x;
	if (h < 0 || y + h > W->fbwin->dy)
		h = W->fbwin->dy - y;
	/* use the color constants */
	c = CFrameBuffer::getInstance()->realcolor[c & 0xff];
	W->fbwin->paintBoxRel(x, y, w, h, c);
	return 0;
}

int CLuaInstance::PaintIcon(lua_State *L)
{
	DBG("CLuaInstance::%s %d\n", __func__, lua_gettop(L));
	int x, y, h;
	unsigned int o;
	const char *fname;

	CLuaData *W = CheckData(L, 1);
	if (!W || !W->fbwin)
		return 0;
	fname = luaL_checkstring(L, 2);
	x = luaL_checkint(L, 3);
	y = luaL_checkint(L, 4);
	h = luaL_checkint(L, 5);
	o = luaL_checkint(L, 6);
	W->fbwin->paintIcon(fname, x, y, h, o);
	return 0;
}

int CLuaInstance::RenderString(lua_State *L)
{
	int x, y, w, boxh, utf8, f;
	unsigned int c;
	const char *text;
	int numargs = lua_gettop(L);
	DBG("CLuaInstance::%s %d\n", __func__, numargs);
	c = COL_MENUCONTENT;
	boxh = 0;
	utf8 = 1;

	CLuaData *W = CheckData(L, 1);
	if (!W || !W->fbwin)
		return 0;
	f = luaL_checkint(L, 2);	/* font number, use FONT_TYPE_XXX in the script */
	text = luaL_checkstring(L, 3);	/* text */
	x = luaL_checkint(L, 4);
	y = luaL_checkint(L, 5);
	if (numargs > 5)
		c = luaL_checkint(L, 6);
	if (numargs > 6)
		w = luaL_checkint(L, 7);
	else
		w = W->fbwin->dx - x;
	if (numargs > 7)
		boxh = luaL_checkint(L, 8);
	if (numargs > 8)
		utf8 = luaL_checkint(L, 9);
	if (f >= FONT_TYPE_COUNT || f < 0)
		f = SNeutrinoSettings::FONT_TYPE_MENU;
	W->fbwin->RenderString(g_Font[f], x, y, w, text, c, boxh, utf8);
	return 0;
}

int CLuaInstance::GetInput(lua_State *L)
{
	int numargs = lua_gettop(L);
	int timeout = 0;
	neutrino_msg_t msg;
	neutrino_msg_data_t data;
	CLuaData *W = CheckData(L, 1);
	if (!W)
		return 0;
	if (numargs > 1)
		timeout = luaL_checkint(L, 2);
	W->rcinput->getMsg_ms(&msg, &data, timeout);
	/* TODO: I'm not sure if this works... */
	if (msg != CRCInput::RC_timeout && msg > CRCInput::RC_MaxRC)
	{
		DBG("CLuaInstance::%s: msg 0x%08lx data 0x%08lx\n", __func__, msg, data);
		CNeutrinoApp::getInstance()->handleMsg(msg, data);
	}
	/* signed int is debatable, but the "big" messages can't yet be handled
	 * inside lua scripts anyway. RC_timeout == -1, RC_nokey == -2 */
	lua_pushinteger(L, (int)msg);
	lua_pushunsigned(L, data);
	return 2;
}

int CLuaInstance::GCWindow(lua_State *L)
{
	DBG("CLuaInstance::%s %d\n", __func__, lua_gettop(L));
	CLuaData *w = (CLuaData *)lua_unboxpointer(L, 1);
	delete w->fbwin;
	w->rcinput = NULL;
	delete w;
	return 0;
}