/** Check if an engine is buildable.

 * @param engine  index of the engine to check.

 * @param type    the type the engine should be.

 * @param company index of the company.

 * @return True if an engine is valid, of the specified type, and buildable by

 *              the given company.

 */

bool IsEngineBuildable(EngineID engine, VehicleType type, CompanyID company)

{

	const Engine *e = Engine::GetIfValid(engine);

	/* check if it's an engine that is in the engine array */

	if (e == NULL) return false;

	/* check if it's an engine of specified type */

	if (e->type != type) return false;

	/* check if it's available */

	if (!HasBit(e->company_avail, company)) return false;

	if (type == VEH_TRAIN) {

		/* Check if the rail type is available to this company */

		const Company *c = Company::Get(company);

	}

	return true;

}

/**

 * Check if an engine is refittable.

 * Note: Likely you want to use IsArticulatedVehicleRefittable().

 * @param engine index of the engine to check.

 * @return true if the engine is refittable.

 */

bool IsEngineRefittable(EngineID engine)

{

	const Engine *e = Engine::GetIfValid(engine);

	/* check if it's an engine that is in the engine array */

	if (e == NULL) return false;

	if (e->type == VEH_SHIP && !e->u.ship.refittable) return false;

	if (!e->CanCarryCargo()) return false;

	const EngineInfo *ei = &e->info;

	if (ei->refit_mask == 0) return false;