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/*
 * Copyright The WildFly Authors
 * SPDX-License-Identifier: Apache-2.0
 */

package org.wildfly.clustering.marshalling.protostream;

import java.io.DataOutput;
import java.lang.reflect.Array;
import java.nio.ByteBuffer;
import java.util.function.Consumer;
import java.util.function.DoubleConsumer;
import java.util.function.IntConsumer;
import java.util.function.LongConsumer;

import org.wildfly.common.function.Functions;

/**
 * {@link DataOutput} implementation used to read the unexposed fields of an {@link org.jgroups.util.Streamable} object.
 * @author Paul Ferraro
 */
public class SimpleDataOutput implements DataOutput {

    private final Consumer stringConsumer;
    private final Consumer bufferConsumer;
    private final Consumer charConsumer;
    private final Consumer booleanConsumer;
    private final Consumer byteConsumer;
    private final Consumer shortConsumer;
    private final IntConsumer intConsumer;
    private final LongConsumer longConsumer;
    private final Consumer floatConsumer;
    private final DoubleConsumer doubleConsumer;

    SimpleDataOutput(Builder builder) {
        this.stringConsumer = builder.stringConsumer;
        this.bufferConsumer = builder.bufferConsumer;
        this.charConsumer = builder.charConsumer;
        this.booleanConsumer = builder.booleanConsumer;
        this.byteConsumer = builder.byteConsumer;
        this.shortConsumer = builder.shortConsumer;
        this.intConsumer = builder.intConsumer;
        this.longConsumer = builder.longConsumer;
        this.floatConsumer = builder.floatConsumer;
        this.doubleConsumer = builder.doubleConsumer;
    }

    @Override
    public void writeInt(int value) {
        this.intConsumer.accept(value);
    }

    @Override
    public void writeLong(long value) {
        this.longConsumer.accept(value);
    }

    @Override
    public void writeDouble(double value) {
        this.doubleConsumer.accept(value);
    }

    @Override
    public void writeUTF(String value) {
        this.stringConsumer.accept(value);
    }

    @Override
    public void write(byte[] buffer) {
        this.bufferConsumer.accept(ByteBuffer.wrap(buffer));
    }

    @Override
    public void write(byte[] buffer, int offset, int length) {
        this.bufferConsumer.accept(ByteBuffer.wrap(buffer, offset, length));
    }

    @Override
    public void write(int value) {
        this.writeByte(value);
    }

    @Override
    public void writeBoolean(boolean value) {
        this.booleanConsumer.accept(value);
    }

    @Override
    public void writeByte(int value) {
        this.byteConsumer.accept((byte) value);
    }

    @Override
    public void writeShort(int value) {
        this.shortConsumer.accept((short) value);
    }

    @Override
    public void writeChar(int value) {
        this.charConsumer.accept((char) value);
    }

    @Override
    public void writeFloat(float value) {
        this.floatConsumer.accept(value);
    }

    @Override
    public void writeBytes(String value) {
        this.stringConsumer.accept(value);
    }

    @Override
    public void writeChars(String value) {
        this.stringConsumer.accept(value);
    }

    public static class Builder {
        Consumer stringConsumer = Functions.discardingConsumer();
        Consumer charConsumer = Functions.discardingConsumer();
        Consumer bufferConsumer = Functions.discardingConsumer();
        Consumer booleanConsumer = Functions.discardingConsumer();
        Consumer byteConsumer = Functions.discardingConsumer();
        Consumer shortConsumer = Functions.discardingConsumer();
        IntConsumer intConsumer = DiscardingConsumer.INSTANCE;
        LongConsumer longConsumer = DiscardingConsumer.INSTANCE;
        Consumer floatConsumer = Functions.discardingConsumer();
        DoubleConsumer doubleConsumer = DiscardingConsumer.INSTANCE;

        public Builder with(String[] values) {
            this.stringConsumer = new ArrayConsumer<>(values);
            return this;
        }

        public Builder with(char[] values) {
            this.charConsumer = new GenericArrayConsumer<>(values);
            return this;
        }

        public Builder with(ByteBuffer[] values) {
            this.bufferConsumer = new ArrayConsumer<>(values);
            return this;
        }

        public Builder with(boolean[] values) {
            this.booleanConsumer = new GenericArrayConsumer<>(values);
            return this;
        }

        public Builder with(byte[] values) {
            this.byteConsumer = new GenericArrayConsumer<>(values);
            return this;
        }

        public Builder with(short[] values) {
            this.shortConsumer = new GenericArrayConsumer<>(values);
            return this;
        }

        public Builder with(int[] values) {
            this.intConsumer = new IntArrayConsumer(values);
            return this;
        }

        public Builder with(long[] values) {
            this.longConsumer = new LongArrayConsumer(values);
            return this;
        }

        public Builder with(float[] values) {
            this.floatConsumer = new GenericArrayConsumer<>(values);
            return this;
        }

        public Builder with(double[] values) {
            this.doubleConsumer = new DoubleArrayConsumer(values);
            return this;
        }

        public DataOutput build() {
            return new SimpleDataOutput(this);
        }
    }

    enum DiscardingConsumer implements IntConsumer, LongConsumer, DoubleConsumer {
        INSTANCE;

        @Override
        public void accept(long value) {
        }

        @Override
        public void accept(int value) {
        }

        @Override
        public void accept(double value) {
        }
    }

    public static class ArrayConsumer implements Consumer {
        private T[] values;
        private int index = 0;

        ArrayConsumer(T[] values) {
            this.values = values;
        }

        @Override
        public void accept(T value) {
            this.values[this.index++] = value;
        }
    }

    public static class GenericArrayConsumer implements Consumer {
        private Object values;
        private int index = 0;

        GenericArrayConsumer(Object values) {
            this.values = values;
        }

        @Override
        public void accept(T value) {
            Array.set(this.values, this.index++, value);
        }
    }

    static class IntArrayConsumer implements IntConsumer {
        private int[] values;
        private int index = 0;

        IntArrayConsumer(int[] values) {
            this.values = values;
        }

        @Override
        public void accept(int value) {
            this.values[this.index++] = value;
        }
    }

    static class LongArrayConsumer implements LongConsumer {
        private long[] values;
        private int index = 0;

        LongArrayConsumer(long[] values) {
            this.values = values;
        }

        @Override
        public void accept(long value) {
            this.values[this.index++] = value;
        }
    }

    static class DoubleArrayConsumer implements DoubleConsumer {
        private double[] values;
        private int index = 0;

        DoubleArrayConsumer(double[] values) {
            this.values = values;
        }

        @Override
        public void accept(double value) {
            this.values[this.index++] = value;
        }
    }
}