/*
 *  gcsd
 *
 *  gcsd the generic command sequencer daemon can be used to serialize
 *  commands sent over various paralell communication channels to a
 *  single command output. It can be seen as a multiplexer for any
 *  kind of communication between a single resource and various clients
 *  which want to submit commands to it or query information from it.
 *  gcsd is written in C and Lua. The goal is to provide an easy to
 *  understand high level API based on Lua which can be used to
 *  implement the business logic of the so formed multiplexer daemon.
 *
 *
 *  Copyright (C) 2009-2010 Markus Grueneis <gimpf@spreadspace.org>
 *                          Christian Pointner <equinox@spreadspace.org>
 *
 *  This file is part of gcsd.
 *
 *  gcsd 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 3 of the License, or
 *  any later version.
 *
 *  gcsd 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 gcsd. If not, see <http://www.gnu.org/licenses/>.
 */

#include <lua.h>
#include <lauxlib.h>

#include <stdlib.h>

#include "datatypes.h"
#include "log.h"

#include "l_log.h"

static int l_log_init(lua_State *L)
{
  log_init();
  return 0;
}

static int l_log_close(lua_State *L)
{
  log_close();
  return 0;
}

static int l_log_add_target(lua_State *L)
{
  int ret = log_add_target(luaL_checkstring(L,1));
  if(ret) {
    lua_pushboolean(L, 0);
    switch(ret) {
    case -2: lua_pushstring(L, "memory error at log_add_target"); break;
    case -3: lua_pushstring(L, "unknown log target"); break;
    case -4: lua_pushstring(L, "this log target is only allowed once"); break;
    default: lua_pushstring(L, "syntax error"); break;
    }
    return 2;
  }

  lua_pushboolean(L, 1);
  return 1;
}

static int l_log_printf(lua_State *L)
{
  int numargs = lua_gettop(L);
  if(numargs < 2)
    return luaL_error(L, "log.printf too few arguments");

  if(numargs > 2) {
    lua_getglobal(L, "string");
    lua_pushliteral(L, "format");
    lua_gettable(L, -2);
    lua_insert(L, 2);
    lua_remove(L, -1);
    lua_call(L, numargs - 1, 1);
  }

  log_prio_t prio = luaL_checkint(L,1);
  log_printf(prio, "%s", luaL_checkstring(L, 2));
  return 0;
}

static const struct luaL_Reg log_funcs [] = {
  { "init", l_log_init },
  { "close", l_log_close },
  { "add_target", l_log_add_target },
  { "printf", l_log_printf },
  { NULL, NULL }
};


LUALIB_API int luaopen_log(lua_State *L)
{
#if LUA_VERSION_NUM > 501
  lua_newtable(L);
  luaL_setfuncs(L, log_funcs, 0);
  lua_pushvalue(L, -1);
  lua_setglobal(L, LUA_LOGLIBNAME);
#else
  luaL_register(L, LUA_LOGLIBNAME, log_funcs);
#endif
  lua_pushliteral(L, "ERROR");
  lua_pushinteger(L, ERROR);
  lua_settable(L, -3);
  lua_pushliteral(L, "WARNING");
  lua_pushinteger(L, WARNING);
  lua_settable(L, -3);
  lua_pushliteral(L, "NOTICE");
  lua_pushinteger(L, NOTICE);
  lua_settable(L, -3);
  lua_pushliteral(L, "INFO");
  lua_pushinteger(L, INFO);
  lua_settable(L, -3);
  lua_pushliteral(L, "DEBUG");
  lua_pushinteger(L, DEBUG);
  lua_settable(L, -3);
  return 1;
}