/* Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

*/

/*

* windows.c

* Windows support functions for Lua

*/

#include <stdio.h>

#include <windows.h>

#include <windns.h>

#include "lua.h"

#include "lauxlib.h"

#if (LUA_VERSION_NUM < 504)

#define luaL_pushfail lua_pushnil

#endif

static int Lget_nameservers(lua_State *L) {

	char stack_buffer[1024]; // stack allocated buffer

	IP4_ARRAY *ips = (IP4_ARRAY *) stack_buffer;

	DWORD len = sizeof(stack_buffer);

	DNS_STATUS status;

	status = DnsQueryConfig(DnsConfigDnsServerList, FALSE, NULL, NULL, ips, &len);

	if(status == 0) {

		DWORD i;

		lua_createtable(L, ips->AddrCount, 0);

		for(i = 0; i < ips->AddrCount; i++) {

			DWORD ip = ips->AddrArray[i];

			char ip_str[16] = "";

			sprintf_s(ip_str, sizeof(ip_str), "%d.%d.%d.%d", (ip >> 0) & 255, (ip >> 8) & 255, (ip >> 16) & 255, (ip >> 24) & 255);

			lua_pushstring(L, ip_str);

			lua_rawseti(L, -2, i + 1);

		}

		return 1;

	} else {

		luaL_pushfail(L);

		lua_pushfstring(L, "DnsQueryConfig returned %d", status);

		return 2;

	}

}

static int lerror(lua_State *L, char *string) {

	luaL_pushfail(L);

	lua_pushfstring(L, "%s: %d", string, GetLastError());

	return 2;

}

static int Lget_consolecolor(lua_State *L) {

	HWND console = GetStdHandle(STD_OUTPUT_HANDLE);

	WORD color;

	DWORD read_len;

	CONSOLE_SCREEN_BUFFER_INFO info;

	if(console == INVALID_HANDLE_VALUE) {

		return lerror(L, "GetStdHandle");

	}

	if(!GetConsoleScreenBufferInfo(console, &info)) {

		return lerror(L, "GetConsoleScreenBufferInfo");

	}

	if(!ReadConsoleOutputAttribute(console, &color, 1, info.dwCursorPosition, &read_len)) {

		return lerror(L, "ReadConsoleOutputAttribute");

	}

	lua_pushnumber(L, color);

	return 1;

}

static int Lset_consolecolor(lua_State *L) {

	int color = luaL_checkint(L, 1);

	HWND console = GetStdHandle(STD_OUTPUT_HANDLE);

	if(console == INVALID_HANDLE_VALUE) {

		return lerror(L, "GetStdHandle");

	}

	if(!SetConsoleTextAttribute(console, color)) {

		return lerror(L, "SetConsoleTextAttribute");

	}

	lua_pushboolean(L, 1);

	return 1;

}

static const luaL_Reg Reg[] = {

	{ "get_nameservers",	Lget_nameservers	},

	{ "get_consolecolor",	Lget_consolecolor	},

	{ "set_consolecolor",	Lset_consolecolor	},

	{ NULL,		NULL	}

};

LUALIB_API int luaopen_util_windows(lua_State *L) {

	luaL_checkversion(L);

	lua_newtable(L);

	luaL_setfuncs(L, Reg, 0);

	lua_pushliteral(L, "-3.14");

	lua_setfield(L, -2, "version");

	return 1;

}