/*
 * This file is part of ViaVersion - https://github.com/ViaVersion/ViaVersion
 * Copyright (C) 2016-2021 ViaVersion and contributors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.viaversion.viaversion.sponge.handlers;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import com.viaversion.viaversion.api.data.UserConnection;
import com.viaversion.viaversion.exception.CancelEncoderException;
import com.viaversion.viaversion.exception.CancelCodecException;
import com.viaversion.viaversion.handlers.ChannelHandlerContextWrapper;
import com.viaversion.viaversion.handlers.ViaHandler;
import com.viaversion.viaversion.util.PipelineUtil;

import java.lang.reflect.InvocationTargetException;

public class SpongeEncodeHandler extends MessageToByteEncoder<Object> implements ViaHandler {
    private final UserConnection info;
    private final MessageToByteEncoder<?> minecraftEncoder;

    public SpongeEncodeHandler(UserConnection info, MessageToByteEncoder<?> minecraftEncoder) {
        this.info = info;
        this.minecraftEncoder = minecraftEncoder;
    }

    @Override
    protected void encode(final ChannelHandlerContext ctx, Object o, final ByteBuf bytebuf) throws Exception {
        // handle the packet type
        if (!(o instanceof ByteBuf)) {
            // call minecraft encoder
            try {
                PipelineUtil.callEncode(this.minecraftEncoder, new ChannelHandlerContextWrapper(ctx, this), o, bytebuf);
            } catch (InvocationTargetException e) {
                if (e.getCause() instanceof Exception) {
                    throw (Exception) e.getCause();
                } else if (e.getCause() instanceof Error) {
                    throw (Error) e.getCause();
                }
            }
        } else {
            bytebuf.writeBytes((ByteBuf) o);
        }
        transform(bytebuf);
    }

    @Override
    public void transform(ByteBuf bytebuf) throws Exception {
        if (!info.checkOutgoingPacket()) throw CancelEncoderException.generate(null);
        if (!info.shouldTransformPacket()) return;
        info.transformOutgoing(bytebuf, CancelEncoderException::generate);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        if (cause instanceof CancelCodecException) return;
        super.exceptionCaught(ctx, cause);
    }
}
