/* $Id: command_queue.c 5306 2006-06-18 00:29:44Z richk $ */

#include "stdafx.h"
#include "openttd.h"
#include "table/sprites.h"
#include "table/strings.h"
#include "functions.h"
#include "player.h"
#include "tile.h"
#include "window.h"
#include "gui.h"
#include "viewport.h"
#include "gfx.h"
#include "sound.h"
#include "command.h"
#include "vehicle.h"
#include "tunnel_map.h"
#include "bridge_map.h"
#include "waypoint.h"
#include "variables.h"
#include "debug.h"

void CQ_Put(void)
{
	//increase size
	_command_queue_size++;
	//increase pop index, wrap if necessary
	_command_queue_put++;
	if (_command_queue_put >= COMMAND_QUEUE_CAPACITY)
		_command_queue_put = 0;
}

void QueueCommand(TileIndex tile, uint32 p1, uint32 p2, void *callback, uint32 cmd)
{
	if (_command_queue_size < COMMAND_QUEUE_CAPACITY) {
		_command_queue_tile[_command_queue_put] = tile;
		_command_queue_p1[_command_queue_put] = p1;
		_command_queue_p2[_command_queue_put] = p2;
		_command_queue_callback[_command_queue_put] = callback;
		_command_queue_cmd[_command_queue_put] = cmd;
		CQ_Put();
	}
	else {
		debug("WARNING: Command Queue full!");
	}
}

void CQ_Pop(void)
{
	//decrease size
	_command_queue_size--;
	//increase pop index, wrap if necessary
	_command_queue_pop++;
	if (_command_queue_pop >= COMMAND_QUEUE_CAPACITY)
		_command_queue_pop = 0;
}

uint32 GetRemainingQueueSpace(void) {
	return COMMAND_QUEUE_CAPACITY - _command_queue_size;
}

void ExecuteNextCommand(void)
{
	//We store & unset shift_pressed during execution
	bool _temp_shift_pressed;
	if (_command_queue_size > 0) {
		_temp_shift_pressed = _shift_pressed;
		_shift_pressed = false;
		DoCommandP(
			_command_queue_tile[_command_queue_pop],
			_command_queue_p1[_command_queue_pop],
			_command_queue_p2[_command_queue_pop],
			(CommandCallback *)_command_queue_callback[_command_queue_pop],
			_command_queue_cmd[_command_queue_pop]
			);
		CQ_Pop();
		_shift_pressed = _temp_shift_pressed;
	}
}

void ClearCommandQueue(void)
{
	_command_queue_size = 0;
	_command_queue_pop = 0;
	_command_queue_put = 0;
}