/*
 * Minecraft Forge
 * Copyright (c) 2016-2019.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation version 2.1
 * of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package net.minecraftforge.fluids;

import net.minecraftforge.fluids.capability.IFluidHandler.FluidAction;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * This interface represents a Fluid Tank. IT IS NOT REQUIRED but is provided for convenience.
 * You are free to handle Fluids in any way that you wish - this is simply an easy default way.
 * DO NOT ASSUME that these objects are used internally in all cases.
 */
public interface IFluidTank {

    /**
     * @return FluidStack representing the fluid in the tank, null if the tank is empty.
     */
    @Nonnull
    FluidStack getFluid();

    /**
     * @return Current amount of fluid in the tank.
     */
    int getFluidAmount();

    /**
     * @return Capacity of this fluid tank.
     */
    int getCapacity();

    /**
     * @param stack Fluidstack holding the Fluid to be queried.
     * @return If the tank can hold the fluid (EVER, not at the time of query).
     */
    boolean isFluidValid(FluidStack stack);

    /**
     * @param resource FluidStack attempting to fill the tank.
     * @param action   If SIMULATE, the fill will only be simulated.
     * @return Amount of fluid that was accepted (or would be, if simulated) by the tank.
     */
    int fill(FluidStack resource, FluidAction action);

    /**
     * @param maxDrain Maximum amount of fluid to be removed from the container.
     * @param action   If SIMULATE, the drain will only be simulated.
     * @return Amount of fluid that was removed (or would be, if simulated) from the tank.
     */
    @Nonnull
    FluidStack drain(int maxDrain, FluidAction action);

    /**
     * @param resource Maximum amount of fluid to be removed from the container.
     * @param action   If SIMULATE, the drain will only be simulated.
     * @return FluidStack representing fluid that was removed (or would be, if simulated) from the tank.
     */
    @Nonnull
    FluidStack drain(FluidStack resource, FluidAction action);

}