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/* $Id$ */

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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_data.h"

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#include "../string.h"

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#include "network_client.h"

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#include "../command.h"

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#include "../callback_table.h"

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#include "../helpers.hpp"

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// Add a command to the local command queue

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void NetworkAddCommandQueue(NetworkClientState *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 = MallocT<CommandPacket>(1);

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	byte temp_callback;

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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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	temp_callback = 0;

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	while (temp_callback < _callback_table_count && _callback_table[temp_callback] != callback)

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		temp_callback++;

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	if (temp_callback == _callback_table_count) {

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

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		temp_callback = 0; /* _callback_table[0] == NULL */

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	}

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	if (_network_server) {

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		// We are the server, so set the command to be executed next possible frame

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		c->frame = _frame_counter_max + 1;

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	} else {

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

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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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		NetworkClientState *cs;

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		// And we queue it for delivery to the clients

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		FOR_ALL_CLIENTS(cs) {

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			if (cs->status > STATUS_AUTH) NetworkAddCommandQueue(cs, c);

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		}

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		// Only the server gets the callback, because clients should not get them

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		c->callback = temp_callback;

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		if (_local_command_queue == NULL) {

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			_local_command_queue = c;

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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 = c;

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		}

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		return;

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	}

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

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	c->callback = temp_callback;

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

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}

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#endif /* ENABLE_NETWORK */