/*
 * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
 * Copyright (C) 2016-2021 ViaVersion and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.viaversion.viaversion.api.type.types.minecraft;

import com.github.steveice10.opennbt.NBTIO;
import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
import com.google.common.base.Preconditions;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufInputStream;
import io.netty.buffer.ByteBufOutputStream;
import com.viaversion.viaversion.api.type.Type;

import java.io.DataInput;
import java.io.DataOutput;

public class NBTType extends Type<CompoundTag> {

    public NBTType() {
        super(CompoundTag.class);
    }

    @Override
    public CompoundTag read(ByteBuf buffer) throws Exception {
        Preconditions.checkArgument(buffer.readableBytes() <= 2097152, "Cannot read NBT (got %s bytes)", buffer.readableBytes());

        int readerIndex = buffer.readerIndex();
        byte b = buffer.readByte();
        if (b == 0) {
            return null;
        } else {
            buffer.readerIndex(readerIndex);
            return NBTIO.readTag((DataInput) new ByteBufInputStream(buffer));
        }
    }

    @Override
    public void write(ByteBuf buffer, CompoundTag object) throws Exception {
        if (object == null) {
            buffer.writeByte(0);
        } else {
            ByteBufOutputStream bytebufStream = new ByteBufOutputStream(buffer);
            NBTIO.writeTag((DataOutput) bytebufStream, object);
        }
    }
}
