/*
 * Copyright 1998-2014 University Corporation for Atmospheric Research/Unidata
 *
 *   Portions of this software were developed by the Unidata Program at the
 *   University Corporation for Atmospheric Research.
 *
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 *   and understandings on the user. The user is granted the right, without
 *   any fee or cost, to use, copy, modify, alter, enhance and distribute
 *   this software, and any derivative works thereof, and its supporting
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 */
package org.meteoinfo.ndarray;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.time.LocalDateTime;

/**
 * Concrete implementation of Array specialized for bytes. Data storage is with
 * 1D java array of bytes.
 * <p/>
 * issues: what should we do if a conversion loses accuracy? nothing ? Exception
 * ?
 *
 * @author caron
 * @see Array
 */
public class ArrayByte extends Array {

    // package private. use Array.factory() */
    static ArrayByte factory(Index index, boolean isUnsigned) {
        return ArrayByte.factory(index, isUnsigned, null);
    }

    /* create new ArrayByte with given Index and backing store.
   * Should be private.
   * @param index use this Index
   * @param storage use this storage. if null, allocate.
   * @return new ArrayByte.D<rank> or ArrayByte object.
     */
    static ArrayByte factory(Index index, boolean isUnsigned, byte[] storage) {
        switch (index.getRank()) {
            case 0:
                return new D0(index, isUnsigned, storage);
            case 1:
                return new D1(index, isUnsigned, storage);
            case 2:
                return new D2(index, isUnsigned, storage);
            case 3:
                return new D3(index, isUnsigned, storage);
            case 4:
                return new D4(index, isUnsigned, storage);
            case 5:
                return new D5(index, isUnsigned, storage);
            case 6:
                return new D6(index, isUnsigned, storage);
            case 7:
                return new D7(index, isUnsigned, storage);
            default:
                return new ArrayByte(index, isUnsigned, storage);
        }
    }

    ///////////////////////////////////////////////////////////////////////////////
    protected byte[] storage;

    /**
     * Create a new Array of type byte and the given shape. dimensions.length
     * determines the rank of the new Array.
     *
     * @param dimensions the shape of the Array.
     */
    public ArrayByte(int[] dimensions, boolean isUnsigned) {
        super(isUnsigned? DataType.UBYTE : DataType.BYTE, dimensions);
        storage = new byte[(int) indexCalc.getSize()];
    }

    /**
     * Create a new Array using the given IndexArray and backing store. used for
     * sections. Trusted package private.
     *
     * @param ima use this IndexArray as the index
     * @param data use this as the backing store
     */
    ArrayByte(Index ima, boolean isUnsigned, byte[] data) {
        super(isUnsigned? DataType.UBYTE : DataType.BYTE, ima);
        /* replace by something better
    if (ima.getSize() != data.length)
      throw new IllegalArgumentException("bad data length");  */
        if (data != null) {
            storage = data;
        } else {
            storage = new byte[(int) ima.getSize()];
        }
    }

    protected Array createView(Index index) {
        return ArrayByte.factory(index, isUnsigned(), storage);
    }

    public Object getStorage() {
        return storage;
    }

    // copy from javaArray to storage using the iterator: used by factory( Object);
    protected void copyFrom1DJavaArray(IndexIterator iter, Object javaArray) {
        byte[] ja = (byte[]) javaArray;
        for (byte aJa : ja) {
            iter.setByteNext(aJa);
        }
    }

    // copy to javaArray from storage using the iterator: used by copyToNDJavaArray;
    protected void copyTo1DJavaArray(IndexIterator iter, Object javaArray) {
        byte[] ja = (byte[]) javaArray;
        for (int i = 0; i < ja.length; i++) {
            ja[i] = iter.getByteNext();
        }
    }

    @Override
    public ByteBuffer getDataAsByteBuffer() {
        return getDataAsByteBuffer(null);
    }

    public ByteBuffer getDataAsByteBuffer(ByteOrder order) {// order irrelevant here
        return ByteBuffer.wrap((byte[]) get1DJavaArray(byte.class));
    }

    /**
     * Return the element class type
     */
    public Class getElementType() {
        return byte.class;
    }

    /**
     * get the value at the specified index.
     *
     * @param i index
     * @return byte value
     */
    public byte get(Index i) {
        return storage[i.currentElement()];
    }

    /**
     * set the value at the sepcified index.
     *
     * @param i index
     * @param value set to this value
     */
    public void set(Index i, byte value) {
        storage[i.currentElement()] = value;
    }

    public double getDouble(Index i) {
        byte val = storage[i.currentElement()];
        return (double) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setDouble(Index i, double value) {
        storage[i.currentElement()] = (byte) value;
    }

    public float getFloat(Index i) {
        byte val = storage[i.currentElement()];
        return (float) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setFloat(Index i, float value) {
        storage[i.currentElement()] = (byte) value;
    }

    public long getLong(Index i) {
        byte val = storage[i.currentElement()];
        return (long) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setLong(Index i, long value) {
        storage[i.currentElement()] = (byte) value;
    }

    public int getInt(Index i) {
        byte val = storage[i.currentElement()];
        return (int) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setInt(Index i, int value) {
        storage[i.currentElement()] = (byte) value;
    }

    public short getShort(Index i) {
        byte val = storage[i.currentElement()];
        return (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setShort(Index i, short value) {
        storage[i.currentElement()] = (byte) value;
    }

    public byte getByte(Index i) {
        return storage[i.currentElement()];
    }

    public void setByte(Index i, byte value) {
        storage[i.currentElement()] = value;
    }

    public char getChar(Index i) {
        byte val = storage[i.currentElement()];
        return (char) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setChar(Index i, char value) {
        storage[i.currentElement()] = (byte) value;
    }

    /**
     * not legal, throw ForbiddenConversionException
     */
    public boolean getBoolean(Index i) {
        throw new ForbiddenConversionException();
    }

    /**
     * not legal, throw ForbiddenConversionException
     */
    public void setBoolean(Index i, boolean value) {
        throw new ForbiddenConversionException();
    }

    /**
     * not legal, throw ForbiddenConversionException
     */
    public String getString(Index i) {
        byte v = this.storage[i.currentElement()];
        return isUnsigned() ? String.valueOf(DataType.unsignedByteToShort(v)) :
                String.valueOf(v);
    }

    /**
     * not legal, throw ForbiddenConversionException
     */
    public void setString(Index i, String value) {
        this.storage[i.currentElement()] = Byte.parseByte(value);
    }

    /**
     * not legal, throw ForbiddenConversionException
     */
    public Complex getComplex(Index i) {
        throw new ForbiddenConversionException();
    }

    /**
     * not legal, throw ForbiddenConversionException
     */
    public void setComplex(Index i, Complex value) {
        throw new ForbiddenConversionException();
    }

    public LocalDateTime getDate(Index i) { throw new ForbiddenConversionException(); }

    public void setDate(Index i, LocalDateTime value) { throw new ForbiddenConversionException(); }

    public Object getObject(Index i) {
        return isUnsigned() ? getShort(i) : getByte(i);
    }

    public void setObject(Index i, Object value) {
        storage[i.currentElement()] = ((Number) value).byteValue();
    }

    // package private : mostly for iterators
    public double getDouble(int index) {
        byte val = storage[index];
        return (double) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setDouble(int index, double value) {
        storage[index] = (byte) value;
    }

    public float getFloat(int index) {
        byte val = storage[index];
        return (float) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setFloat(int index, float value) {
        storage[index] = (byte) value;
    }

    public long getLong(int index) {
        byte val = storage[index];
        return (long) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setLong(int index, long value) {
        storage[index] = (byte) value;
    }

    public int getInt(int index) {
        byte val = storage[index];
        return (int) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setInt(int index, int value) {
        storage[index] = (byte) value;
    }

    public short getShort(int index) {
        byte val = storage[index];
        return (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setShort(int index, short value) {
        storage[index] = (byte) value;
    }

    public byte getByte(int index) {
        return storage[index];
    }

    public void setByte(int index, byte value) {
        storage[index] = value;
    }

    public char getChar(int index) {
        byte val = storage[index];
        return (char) (isUnsigned() ? DataType.unsignedByteToShort(val) : val);
    }

    public void setChar(int index, char value) {
        storage[index] = (byte) value;
    }

    public boolean getBoolean(int index) {
        throw new ForbiddenConversionException();
    }

    public void setBoolean(int index, boolean value) {
        throw new ForbiddenConversionException();
    }

    public String getString(int index) {
        byte v = this.storage[index];
        return isUnsigned() ? String.valueOf(DataType.unsignedByteToShort(v)) :
                String.valueOf(v);
    }

    public void setString(int index, String value) {
        this.storage[index] = Byte.parseByte(value);
    }

    public Complex getComplex(int index) {
        throw new ForbiddenConversionException();
    }

    public void setComplex(int index, Complex value) {
        throw new ForbiddenConversionException();
    }

    public LocalDateTime getDate(int index) { throw new ForbiddenConversionException(); }

    public void setDate(int index, LocalDateTime value) { throw new ForbiddenConversionException(); }

    public Object getObject(int index) {
        return isUnsigned() ? getShort(index) : getByte(index);
    }

    public void setObject(int index, Object value) {
        storage[index] = ((Number) value).byteValue();
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 0.
     */
    public static class D0 extends ArrayByte {

        private Index0D ix;

        public D0(boolean isUnsigned) {
            super(new int[]{}, isUnsigned);
            ix = (Index0D) indexCalc;
        }

        private D0(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index0D) indexCalc;
        }

        public byte get() {
            return storage[ix.currentElement()];
        }

        public void set(byte value) {
            storage[ix.currentElement()] = value;
        }
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 1.
     */
    public static class D1 extends ArrayByte {

        private Index1D ix;

        public D1(int len0, boolean isUnsigned) {
            super(new int[]{len0}, isUnsigned);
            ix = (Index1D) indexCalc;
        }

        private D1(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index1D) indexCalc;
        }

        public byte get(int i) {
            return storage[ix.setDirect(i)];
        }

        public void set(int i, byte value) {
            storage[ix.setDirect(i)] = value;
        }
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 2.
     */
    public static class D2 extends ArrayByte {

        private Index2D ix;

        public D2(int len0, int len1, boolean isUnsigned) {
            super(new int[]{len0, len1}, isUnsigned);
            ix = (Index2D) indexCalc;
        }

        private D2(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index2D) indexCalc;
        }

        public byte get(int i, int j) {
            return storage[ix.setDirect(i, j)];
        }

        public void set(int i, int j, byte value) {
            storage[ix.setDirect(i, j)] = value;
        }
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 3.
     */
    public static class D3 extends ArrayByte {

        private Index3D ix;

        public D3(int len0, int len1, int len2, boolean isUnsigned) {
            super(new int[]{len0, len1, len2}, isUnsigned);
            ix = (Index3D) indexCalc;
        }

        private D3(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index3D) indexCalc;
        }

        public byte get(int i, int j, int k) {
            return storage[ix.setDirect(i, j, k)];
        }

        public void set(int i, int j, int k, byte value) {
            storage[ix.setDirect(i, j, k)] = value;
        }
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 4.
     */
    public static class D4 extends ArrayByte {

        private Index4D ix;

        public D4(int len0, int len1, int len2, int len3, boolean isUnsigned) {
            super(new int[]{len0, len1, len2, len3}, isUnsigned);
            ix = (Index4D) indexCalc;
        }

        private D4(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index4D) indexCalc;
        }

        public byte get(int i, int j, int k, int l) {
            return storage[ix.setDirect(i, j, k, l)];
        }

        public void set(int i, int j, int k, int l, byte value) {
            storage[ix.setDirect(i, j, k, l)] = value;
        }
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 5.
     */
    public static class D5 extends ArrayByte {

        private Index5D ix;

        public D5(int len0, int len1, int len2, int len3, int len4, boolean isUnsigned) {
            super(new int[]{len0, len1, len2, len3, len4}, isUnsigned);
            ix = (Index5D) indexCalc;
        }

        private D5(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index5D) indexCalc;
        }

        public byte get(int i, int j, int k, int l, int m) {
            return storage[ix.setDirect(i, j, k, l, m)];
        }

        public void set(int i, int j, int k, int l, int m, byte value) {
            storage[ix.setDirect(i, j, k, l, m)] = value;
        }
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 6.
     */
    public static class D6 extends ArrayByte {

        private Index6D ix;

        public D6(int len0, int len1, int len2, int len3, int len4, int len5, boolean isUnsigned) {
            super(new int[]{len0, len1, len2, len3, len4, len5}, isUnsigned);
            ix = (Index6D) indexCalc;
        }

        private D6(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index6D) indexCalc;
        }

        public byte get(int i, int j, int k, int l, int m, int n) {
            return storage[ix.setDirect(i, j, k, l, m, n)];
        }

        public void set(int i, int j, int k, int l, int m, int n, byte value) {
            storage[ix.setDirect(i, j, k, l, m, n)] = value;
        }
    }

    /**
     * Concrete implementation of Array specialized for byte, rank 7.
     */
    public static class D7 extends ArrayByte {

        protected Index7D ix;

        public D7(int len0, int len1, int len2, int len3, int len4, int len5, int len6, boolean isUnsigned) {
            super(new int[]{len0, len1, len2, len3, len4, len5, len6}, isUnsigned);
            ix = (Index7D) indexCalc;
        }

        private D7(Index i, boolean isUnsigned, byte[] store) {
            super(i, isUnsigned, store);
            ix = (Index7D) indexCalc;
        }

        public byte get(int i, int j, int k, int l, int m, int n, int o) {
            return storage[ix.setDirect(i, j, k, l, m, n, o)];
        }

        public void set(int i, int j, int k, int l, int m, int n, int o, byte value) {
            storage[ix.setDirect(i, j, k, l, m, n, o)] = value;
        }
    }

}