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/* $Id$ */

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/**

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 * @file network_gamelist.cpp This file handles the GameList

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 * Also, it handles the request to a server for data about the server

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 */

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#ifdef ENABLE_NETWORK

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#include "../stdafx.h"

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#include "../debug.h"

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#include "../newgrf_config.h"

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#include "../core/alloc_func.hpp"

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#include "core/game.h"

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#include "network_udp.h"

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#include "network_gamelist.h"

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#include "network_gui.h"

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NetworkGameList *_network_game_list = NULL;

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/** Add a new item to the linked gamelist. If the IP and Port match

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 * return the existing item instead of adding it again

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 * @param ip the IP-address (inet_addr) of the to-be added item

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 * @param port the port the server is running on

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 * @return a point to the newly added or already existing item */

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NetworkGameList *NetworkGameListAddItem(uint32 ip, uint16 port)

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{

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	NetworkGameList *item, *prev_item;

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	prev_item = NULL;

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	for (item = _network_game_list; item != NULL; item = item->next) {

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		if (item->ip == ip && item->port == port) return item;

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		prev_item = item;

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	}

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	item = MallocT<NetworkGameList>(1);

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	memset(item, 0, sizeof(*item));

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	item->next = NULL;

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	item->ip = ip;

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	item->port = port;

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	if (prev_item == NULL) {

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		_network_game_list = item;

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	} else {

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		prev_item->next = item;

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	}

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	DEBUG(net, 4, "[gamelist] added server to list");

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	UpdateNetworkGameWindow(false);

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	return item;

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}

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/** Remove an item from the gamelist linked list

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 * @param remove pointer to the item to be removed */

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void NetworkGameListRemoveItem(NetworkGameList *remove)

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{

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	NetworkGameList *item, *prev_item;

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	prev_item = NULL;

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	for (item = _network_game_list; item != NULL; item = item->next) {

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		if (remove == item) {

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			if (prev_item == NULL) {

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				_network_game_list = remove->next;

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			} else {

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				prev_item->next = remove->next;

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			}

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			/* Remove GRFConfig information */

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			ClearGRFConfigList(&remove->info.grfconfig);

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			free(remove);

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			remove = NULL;

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			DEBUG(net, 4, "[gamelist] removed server from list");

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			UpdateNetworkGameWindow(false);

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			return;

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		}

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		prev_item = item;

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	}

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}

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enum {

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	MAX_GAME_LIST_REQUERY_COUNT  =  5, ///< How often do we requery in number of times per server?

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	REQUERY_EVERY_X_GAMELOOPS    = 60, ///< How often do we requery in time?

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	REFRESH_GAMEINFO_X_REQUERIES = 50, ///< Refresh the game info itself after REFRESH_GAMEINFO_X_REQUERIES * REQUERY_EVERY_X_GAMELOOPS game loops

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};

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/** Requeries the (game) servers we have not gotten a reply from */

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void NetworkGameListRequery()

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{

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	static uint8 requery_cnt = 0;

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	if (++requery_cnt < REQUERY_EVERY_X_GAMELOOPS) return;

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	requery_cnt = 0;

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	struct in_addr ip;

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	NetworkGameList *item;

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	for (item = _network_game_list; item != NULL; item = item->next) {

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		item->retries++;

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		if (item->retries < REFRESH_GAMEINFO_X_REQUERIES && (item->online || item->retries >= MAX_GAME_LIST_REQUERY_COUNT)) continue;

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		ip.s_addr = item->ip;

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		/* item gets mostly zeroed by NetworkUDPQueryServer */

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		uint8 retries = item->retries;

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		NetworkUDPQueryServer(inet_ntoa(ip), item->port);

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		item->retries = (retries >= REFRESH_GAMEINFO_X_REQUERIES) ? 0 : retries;

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	}

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}

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#endif /* ENABLE_NETWORK */