/*
 * Minecraft Forge
 * Copyright (c) 2016-2018.
 *
 * 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.capability;

import javax.annotation.Nullable;

import net.minecraftforge.fluids.*;

/**
 * Implement this interface as a capability which should handle fluids, generally storing them in
 * one or more internal {@link IFluidTank} objects.
 * <p/>
 * A reference implementation is provided {@link TileFluidHandler}.
 */
public interface IFluidHandler
{
    /**
     * Returns an array of objects which represent the internal tanks.
     * These objects cannot be used to manipulate the internal tanks.
     *
     * @return Properties for the relevant internal tanks.
     */
    IFluidTankProperties[] getTankProperties();

    /**
     * Fills fluid into internal tanks, distribution is left entirely to the IFluidHandler.
     *
     * @param resource FluidStack representing the Fluid and maximum amount of fluid to be filled.
     * @param doFill   If false, fill will only be simulated.
     * @return Amount of resource that was (or would have been, if simulated) filled.
     */
    int fill(FluidStack resource, boolean doFill);

    /**
     * Drains fluid out of internal tanks, distribution is left entirely to the IFluidHandler.
     *
     * @param resource FluidStack representing the Fluid and maximum amount of fluid to be drained.
     * @param doDrain  If false, drain will only be simulated.
     * @return FluidStack representing the Fluid and amount that was (or would have been, if
     * simulated) drained.
     */
    @Nullable
    FluidStack drain(FluidStack resource, boolean doDrain);

    /**
     * Drains fluid out of internal tanks, distribution is left entirely to the IFluidHandler.
     * <p/>
     * This method is not Fluid-sensitive.
     *
     * @param maxDrain Maximum amount of fluid to drain.
     * @param doDrain  If false, drain will only be simulated.
     * @return FluidStack representing the Fluid and amount that was (or would have been, if
     * simulated) drained.
     */
    @Nullable
    FluidStack drain(int maxDrain, boolean doDrain);
}