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/* $Id$ */

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/** @file ai_cargo.cpp handles the query-related of the AICargo class */

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#include "ai_cargo.hpp"

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#include "../../cargotype.h"

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#include "../../economy_func.h"

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

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#include "../../core/bitmath_func.hpp"

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/* static */ bool AICargo::IsValidCargo(CargoID cargo_type)

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{

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	return (cargo_type < NUM_CARGO && ::GetCargo(cargo_type)->IsValid());

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}

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/* static */ char *AICargo::GetCargoLabel(CargoID cargo_type)

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{

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	if (!IsValidCargo(cargo_type)) return NULL;

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	const CargoSpec *cargo = ::GetCargo(cargo_type);

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	/* cargo->label is a uint32 packing a 4 character non-terminated string,

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	 * like "PASS", "COAL", "OIL_". New ones can be defined by NewGRFs */

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	char *cargo_label = MallocT<char>(sizeof(cargo->label) + 1);

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	for (uint i = 0; i < sizeof(cargo->label); i++) {

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		cargo_label[i] = GB(cargo->label, (sizeof(cargo->label) - i - 1) * 8, 8);

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	}

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	cargo_label[sizeof(cargo->label)] = '\0';

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	return cargo_label;

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}

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/* static */ bool AICargo::IsFreight(CargoID cargo_type)

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{

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	if (!IsValidCargo(cargo_type)) return false;

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	const CargoSpec *cargo = ::GetCargo(cargo_type);

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	return cargo->is_freight;

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}

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/* static */ int32 AICargo::GetCargoIncome(uint32 distance, uint32 days_in_transit, CargoID cargo_type)

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{

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	if (!IsValidCargo(cargo_type)) return 0;

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	return ::GetTransportedGoodsIncome(1, distance, days_in_transit, cargo_type);

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}