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/* $Id$ */

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/** @file cargotype.cpp Implementation of cargos. */

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#include "stdafx.h"

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#include "openttd.h"

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#include "newgrf_cargo.h"

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#include "cargotype.h"

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#include "core/bitmath_func.hpp"

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#include "table/sprites.h"

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#include "table/strings.h"

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#include "table/cargo_const.h"

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CargoSpec _cargo[NUM_CARGO];

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static const byte INVALID_CARGO = 0xFF;

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/* Bitmask of cargo types available */

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uint32 _cargo_mask;

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void SetupCargoForClimate(LandscapeID l)

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{

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	assert(l < lengthof(_default_climate_cargo));

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	/* Reset and disable all cargo types */

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	memset(_cargo, 0, sizeof(_cargo));

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	for (CargoID i = 0; i < lengthof(_cargo); i++) _cargo[i].bitnum = INVALID_CARGO;

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	_cargo_mask = 0;

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	for (CargoID i = 0; i < lengthof(_default_climate_cargo[l]); i++) {

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		CargoLabel cl = _default_climate_cargo[l][i];

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		/* Bzzt: check if cl is just an index into the cargo table */

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		if (cl < lengthof(_default_cargo)) {

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			/* Copy the indexed cargo */

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			_cargo[i] = _default_cargo[cl];

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			if (_cargo[i].bitnum != INVALID_CARGO) SetBit(_cargo_mask, i);

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			continue;

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		}

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		/* Loop through each of the default cargo types to see if

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		 * the label matches */

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		for (uint j = 0; j < lengthof(_default_cargo); j++) {

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			if (_default_cargo[j].label == cl) {

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				_cargo[i] = _default_cargo[j];

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				/* Populate the available cargo mask */

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				SetBit(_cargo_mask, i);

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				break;

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			}

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		}

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	}

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}

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const CargoSpec *GetCargo(CargoID c)

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{

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	assert(c < lengthof(_cargo));

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	return &_cargo[c];

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}

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bool CargoSpec::IsValid() const

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{

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	return bitnum != INVALID_CARGO;

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}

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CargoID GetCargoIDByLabel(CargoLabel cl)

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{

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	for (CargoID c = 0; c < lengthof(_cargo); c++) {

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		if (_cargo[c].bitnum == INVALID_CARGO) continue;

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		if (_cargo[c].label == cl) return c;

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	}

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	/* No matching label was found, so it is invalid */

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	return CT_INVALID;

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}

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/** Find the CargoID of a 'bitnum' value.

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 * @param bitnum 'bitnum' to find.

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 * @return First CargoID with the given bitnum, or CT_INVALID if not found.

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 */

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CargoID GetCargoIDByBitnum(uint8 bitnum)

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{

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	if (bitnum == INVALID_CARGO) return CT_INVALID;

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	for (CargoID c = 0; c < lengthof(_cargo); c++) {

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		if (_cargo[c].bitnum == bitnum) return c;

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	}

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	/* No matching label was found, so it is invalid */

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	return CT_INVALID;

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}

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