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/*
 * Copyright 2015 Skymind,Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package org.nd4j.linalg.jcublas.buffer;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

import jcuda.Pointer;
import jcuda.Sizeof;

import org.nd4j.linalg.api.buffer.DataBuffer;
import org.nd4j.linalg.util.ArrayUtil;

/**
 * Cuda float buffer
 *
 * @author Adam Gibson
 */
public class CudaFloatDataBuffer extends BaseCudaDataBuffer {
    /**
     * Base constructor
     *
     * @param length the length of the buffer
     */
    public CudaFloatDataBuffer(int length) {
        super(length, Sizeof.FLOAT);
    }

    public CudaFloatDataBuffer(float[] buffer) {
        this(buffer.length);
        setData(buffer);
    }


    @Override
    public void assign(int[] indices, float[] data, boolean contiguous, int inc) {

        if (indices.length != data.length)
            throw new IllegalArgumentException("Indices and data length must be the same");
        if (indices.length > length())
            throw new IllegalArgumentException("More elements than space to assign. This buffer is of length " + length() + " where the indices are of length " + data.length);

        if (contiguous) {
            int offset = indices[0];
            Pointer p = Pointer.to(data);
            set(offset, data.length, p, inc);
        } else
            throw new UnsupportedOperationException("Only contiguous supported");
    }

    @Override
    public void assign(int[] indices, double[] data, boolean contiguous, int inc) {

        if (indices.length != data.length)
            throw new IllegalArgumentException("Indices and data length must be the same");
        if (indices.length > length())
            throw new IllegalArgumentException("More elements than space to assign. This buffer is of length " + length() + " where the indices are of length " + data.length);

        if (contiguous) {
            int offset = indices[0];
            Pointer p = Pointer.to(data);
            set(offset, data.length, p, inc);
        } else
            throw new UnsupportedOperationException("Only contiguous supported");
    }


    @Override
    public double[] getDoublesAt(int offset, int inc, int length) {
        return ArrayUtil.toDoubles(getFloatsAt(offset, inc, length));
    }

    @Override
    public float[] getFloatsAt(int offset, int inc, int length) {
        if (offset + length > length())
            length -= offset;
        float[] ret = new float[length];
        FloatBuffer buf = getFloatBuffer(offset);
        for(int i = 0; i < length; i++) {
            ret[i] = buf.get(i * inc);
        }

        return ret;
    }

    @Override
    public void assign(Number value, int offset) {
        int arrLength = length - offset;
        float[] data = new float[arrLength];
        FloatBuffer buf = getFloatBuffer(offset);
        for (int i = 0; i < data.length; i++)
            buf.put(i,value.floatValue());

    }

    @Override
    public void setData(int[] data) {
        setData(ArrayUtil.toFloats(data));
    }

    @Override
    public void setData(float[] data) {

        if (data.length != length)
            throw new IllegalArgumentException("Unable to set vector, must be of length " + length() + " but found length " + data.length);

        getFloatBuffer().put(data);
    }

    @Override
    public void setData(double[] data) {
        setData(ArrayUtil.toFloats(data));
    }

    @Override
    public byte[] asBytes() {
        float[] data = asFloat();
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(bos);
        for(int i = 0; i < data.length; i++)
            try {
                dos.writeFloat(data[i]);
            } catch (IOException e) {
                e.printStackTrace();
            }
        return bos.toByteArray();
    }

    @Override
    public DataBuffer.Type dataType() {
        return DataBuffer.Type.FLOAT;
    }

    @Override
    public float[] asFloat() {
        //ensureNotFreed();
        float[] ret = new float[length()];
        FloatBuffer buf = getFloatBuffer();
        for(int i = 0; i < length(); i++) {
            ret[i] = buf.get(i);
        }
        return ret;
    }

    @Override
    public double[] asDouble() {
        return ArrayUtil.toDoubles(asFloat());
    }

    @Override
    public int[] asInt() {
        return ArrayUtil.toInts(asFloat());
    }


    @Override
    public double getDouble(int i) {
        return getFloat(i);
    }

    @Override
    public float getFloat(int i) {
        return getFloatBuffer().get(i);
    }

    @Override
    public Number getNumber(int i) {
        return getFloat(i);
    }


    @Override
    public void put(int i, float element) {
        getFloatBuffer().put(i,element);
    }

    @Override
    public void put(int i, double element) {
        put(i, (float) element);
    }

    @Override
    public void put(int i, int element) {
        put(i, (float) element);
    }


    @Override
    public int getInt(int ix) {
        return (int) getFloat(ix);
    }

    @Override
    public DataBuffer dup() {
        CudaFloatDataBuffer buf = new CudaFloatDataBuffer(length());
        copyTo(buf);
        return buf;
    }

    @Override
    public void flush() {

    }


    private void writeObject(java.io.ObjectOutputStream stream)
            throws java.io.IOException {
        stream.defaultWriteObject();

        if (getHostPointer() == null) {
            stream.writeInt(0);
        } else {
            float[] arr = this.asFloat();

            stream.writeInt(arr.length);
            for (int i = 0; i < arr.length; i++) {
                stream.writeFloat(arr[i]);
            }
        }
    }

    private void readObject(java.io.ObjectInputStream stream)
            throws java.io.IOException, ClassNotFoundException {
        stream.defaultReadObject();

        int n = stream.readInt();
        float[] arr = new float[n];

        for (int i = 0; i < n; i++) {
            arr[i] = stream.readFloat();
        }
        
        this.length = n;
        this.elementSize = Sizeof.FLOAT;
        hostBuffer = ByteBuffer.allocate(length*elementSize);
        hostBuffer.order(ByteOrder.nativeOrder());
        hostPointer = Pointer.to(hostBuffer);
        
        setData(arr);
    }
}