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/* $Id$ */

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/** @file network_data.cpp Command handling over network connections. */

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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 "network_internal.h"

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#include "network_client.h"

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#include "../command_func.h"

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#include "../callback_table.h"

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

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#include "../string_func.h"

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#include "../date_func.h"

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#include "../player_func.h"

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// Add a command to the local command queue

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void NetworkAddCommandQueue(NetworkTCPSocketHandler *cs, CommandPacket *cp)

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{

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	CommandPacket* new_cp = MallocT<CommandPacket>(1);

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	*new_cp = *cp;

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	if (cs->command_queue == NULL) {

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		cs->command_queue = new_cp;

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	} else {

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		CommandPacket *c = cs->command_queue;

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		while (c->next != NULL) c = c->next;

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		c->next = new_cp;

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	}

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}

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// Prepare a DoCommand to be send over the network

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void NetworkSend_Command(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, CommandCallback *callback)

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{

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	CommandPacket c;

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	c.player = _local_player;

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	c.next   = NULL;

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	c.tile   = tile;

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	c.p1     = p1;

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	c.p2     = p2;

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	c.cmd    = cmd;

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	c.callback = 0;

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	while (c.callback < _callback_table_count && _callback_table[c.callback] != callback) {

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		c.callback++;

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	}

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	if (c.callback == _callback_table_count) {

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		DEBUG(net, 0, "Unknown callback. (Pointer: %p) No callback sent", callback);

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		c.callback = 0; // _callback_table[0] == NULL

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	}

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	ttd_strlcpy(c.text, (_cmd_text != NULL) ? _cmd_text : "", lengthof(c.text));

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	if (_network_server) {

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		/* If we are the server, we queue the command in our 'special' queue.

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		 *   In theory, we could execute the command right away, but then the

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		 *   client on the server can do everything 1 tick faster than others.

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		 *   So to keep the game fair, we delay the command with 1 tick

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		 *   which gives about the same speed as most clients.

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		 */

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		c.frame = _frame_counter_max + 1;

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		CommandPacket *new_cp = MallocT<CommandPacket>(1);

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		*new_cp = c;

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		new_cp->my_cmd = true;

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		if (_local_command_queue == NULL) {

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			_local_command_queue = new_cp;

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		} else {

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			/* Find last packet */

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			CommandPacket *cp = _local_command_queue;

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			while (cp->next != NULL) cp = cp->next;

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			cp->next = new_cp;

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		}

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		/* Only the local client (in this case, the server) gets the callback */

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		c.callback = 0;

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		/* And we queue it for delivery to the clients */

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		NetworkTCPSocketHandler *cs;

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		FOR_ALL_CLIENTS(cs) {

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			if (cs->status > STATUS_MAP_WAIT) NetworkAddCommandQueue(cs, &c);

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		}

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		return;

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	}

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	c.frame = 0; // The client can't tell which frame, so just make it 0

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	/* Clients send their command to the server and forget all about the packet */

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	SEND_COMMAND(PACKET_CLIENT_COMMAND)(&c);

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}

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// Execute a DoCommand we received from the network

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void NetworkExecuteCommand(CommandPacket *cp)

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{

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	_current_player = cp->player;

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	_cmd_text = cp->text;

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	/* cp->callback is unsigned. so we don't need to do lower bounds checking. */

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	if (cp->callback > _callback_table_count) {

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		DEBUG(net, 0, "Received out-of-bounds callback (%d)", cp->callback);

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		cp->callback = 0;

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	}

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	DebugDumpCommands("ddc:cmd:%d;%d;%d;%d;%d;%d;%d;%s\n", _date, _date_fract, (int)cp->player, cp->tile, cp->p1, cp->p2, cp->cmd, cp->text);

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	DoCommandP(cp->tile, cp->p1, cp->p2, _callback_table[cp->callback], cp->cmd | CMD_NETWORK_COMMAND, cp->my_cmd);

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}

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#endif /* ENABLE_NETWORK */