package net.minecraft.network.codec;

import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.DecoderException;
import io.netty.handler.codec.EncoderException;
import it.unimi.dsi.fastutil.objects.Object2IntMap;
import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import net.minecraft.network.VarInt;

public class IdDispatchCodec<B extends ByteBuf, V, T> implements StreamCodec<B, V> {
    private static final int UNKNOWN_TYPE = -1;
    private final Function<V, ? extends T> typeGetter;
    private final List<IdDispatchCodec.Entry<B, V, T>> byId;
    private final Object2IntMap<T> toId;

    IdDispatchCodec(Function<V, ? extends T> p_330610_, List<IdDispatchCodec.Entry<B, V, T>> p_334834_, Object2IntMap<T> p_327784_) {
        this.typeGetter = p_330610_;
        this.byId = p_334834_;
        this.toId = p_327784_;
    }

    public V decode(B p_327793_) {
        int i = VarInt.read(p_327793_);
        if (i >= 0 && i < this.byId.size()) {
            IdDispatchCodec.Entry<B, V, T> entry = this.byId.get(i);

            try {
                return (V)entry.serializer.decode(p_327793_);
            } catch (Exception exception) {
                if (exception instanceof IdDispatchCodec.DontDecorateException) {
                    throw exception;
                } else {
                    throw new DecoderException("Failed to decode packet '" + entry.type + "'", exception);
                }
            }
        } else {
            throw new DecoderException("Received unknown packet id " + i);
        }
    }

    public void encode(B p_336072_, V p_327912_) {
        T t = (T)this.typeGetter.apply(p_327912_);
        int i = this.toId.getOrDefault(t, -1);
        if (i == -1) {
            throw new EncoderException("Sending unknown packet '" + t + "'");
        } else {
            VarInt.write(p_336072_, i);
            IdDispatchCodec.Entry<B, V, T> entry = this.byId.get(i);

            try {
                StreamCodec<? super B, V> streamcodec = (StreamCodec<? super B, V>)entry.serializer;
                streamcodec.encode(p_336072_, p_327912_);
            } catch (Exception exception) {
                if (exception instanceof IdDispatchCodec.DontDecorateException) {
                    throw exception;
                } else {
                    throw new EncoderException("Failed to encode packet '" + t + "'", exception);
                }
            }
        }
    }

    public static <B extends ByteBuf, V, T> IdDispatchCodec.Builder<B, V, T> builder(Function<V, ? extends T> p_331962_) {
        return new IdDispatchCodec.Builder<>(p_331962_);
    }

    public static class Builder<B extends ByteBuf, V, T> {
        private final List<IdDispatchCodec.Entry<B, V, T>> entries = new ArrayList<>();
        private final Function<V, ? extends T> typeGetter;

        Builder(Function<V, ? extends T> p_330341_) {
            this.typeGetter = p_330341_;
        }

        public IdDispatchCodec.Builder<B, V, T> add(T p_333313_, StreamCodec<? super B, ? extends V> p_330239_) {
            this.entries.add(new IdDispatchCodec.Entry<>(p_330239_, p_333313_));
            return this;
        }

        public IdDispatchCodec<B, V, T> build() {
            Object2IntOpenHashMap<T> object2intopenhashmap = new Object2IntOpenHashMap<>();
            object2intopenhashmap.defaultReturnValue(-2);

            for (IdDispatchCodec.Entry<B, V, T> entry : this.entries) {
                int i = object2intopenhashmap.size();
                int j = object2intopenhashmap.putIfAbsent(entry.type, i);
                if (j != -2) {
                    throw new IllegalStateException("Duplicate registration for type " + entry.type);
                }
            }

            return new IdDispatchCodec<>(this.typeGetter, List.copyOf(this.entries), object2intopenhashmap);
        }
    }

    public interface DontDecorateException {
    }

    record Entry<B, V, T>(StreamCodec<? super B, ? extends V> serializer, T type) {
    }
}