package com.mp4parser.streaming.containersource;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.Arrays;

import static com.mp4parser.tools.CastUtils.l2i;

public class DiscardingByteArrayOutputStream extends OutputStream {

    /**
     * The buffer where data is stored.
     */
    protected byte buf[];

    /**
     * The number of valid bytes in the buffer.
     */
    protected int count;

    protected long startOffset = 0;

    /**
     * Creates a new byte array output stream. The buffer capacity is
     * initially 32 bytes, though its size increases if necessary.
     */
    public DiscardingByteArrayOutputStream() {
        this(32);
    }

    public byte[] get(long start, int count) {
        byte[] result = new byte[count];
        try {
            System.arraycopy(buf, l2i(start - startOffset), result, 0, count);
        } catch (ArrayIndexOutOfBoundsException e) {
            System.out.println("start: " + start + " count: " + count + " startOffset:" + startOffset + " count:" + count + " len(buf):" + buf.length + " (start - startOffset):" + (start - startOffset));
            throw e;
        }
        return result;
    }

    /**
     * Creates a new byte array output stream, with a buffer capacity of
     * the specified size, in bytes.
     *
     * @param size the initial size.
     * @throws IllegalArgumentException if size is negative.
     */
    public DiscardingByteArrayOutputStream(int size) {
        if (size < 0) {
            throw new IllegalArgumentException("Negative initial size: "
                    + size);
        }
        buf = new byte[size];
    }

    /**
     * Increases the capacity if necessary to ensure that it can hold
     * at least the number of elements specified by the minimum
     * capacity argument.
     *
     * @param minCapacity the desired minimum capacity
     * @throws OutOfMemoryError if {@code minCapacity < 0}.  This is
     *                          interpreted as a request for the unsatisfiably large capacity
     *                          {@code (long) Integer.MAX_VALUE + (minCapacity - Integer.MAX_VALUE)}.
     */
    private void ensureCapacity(int minCapacity) {
        // overflow-conscious code
        if (minCapacity - buf.length > 0)
            grow(minCapacity);
    }

    /**
     * Increases the capacity to ensure that it can hold at least the
     * number of elements specified by the minimum capacity argument.
     *
     * @param minCapacity the desired minimum capacity
     */
    private void grow(int minCapacity) {
        // overflow-conscious code
        int oldCapacity = buf.length;
        int newCapacity = oldCapacity << 1;
        if (newCapacity - minCapacity < 0)
            newCapacity = minCapacity;
        if (newCapacity < 0) {
            if (minCapacity < 0) // overflow
                throw new OutOfMemoryError();
            newCapacity = Integer.MAX_VALUE;
        }
        buf = Arrays.copyOf(buf, newCapacity);
    }

    /**
     * Writes the specified byte to this byte array output stream.
     *
     * @param b the byte to be written.
     */
    public synchronized void write(int b) {
        ensureCapacity(count + 1);
        buf[count] = (byte) b;
        count += 1;
    }

    /**
     * Writes <code>len</code> bytes from the specified byte array
     * starting at offset <code>off</code> to this byte array output stream.
     *
     * @param b   the data.
     * @param off the start offset in the data.
     * @param len the number of bytes to write.
     */
    public synchronized void write(byte b[], int off, int len) {
        if ((off < 0) || (off > b.length) || (len < 0) ||
                ((off + len) - b.length > 0)) {
            throw new IndexOutOfBoundsException();
        }
        ensureCapacity(count + len);
        System.arraycopy(b, off, buf, count, len);
        count += len;
    }

    /**
     * Resets the <code>count</code> field of this byte array output
     * stream to zero, so that all currently accumulated output in the
     * output stream is discarded. The output stream can be used again,
     * reusing the already allocated buffer space.
     *
     * @see java.io.ByteArrayInputStream#count
     */
    public synchronized void reset() {
        count = 0;
    }

    /**
     * Creates a newly allocated byte array. Its size is the current
     * size of this output stream and the valid contents of the buffer
     * have been copied into it.
     *
     * @return the current contents of this output stream, as a byte array.
     * @see java.io.ByteArrayOutputStream#size()
     */
    public synchronized byte toByteArray()[] {
        return Arrays.copyOf(buf, count);
    }

    /**
     * Returns the current size of the buffer.
     *
     * @return the value of the <code>count</code> field, which is the number
     * of valid bytes in this output stream.
     * @see java.io.ByteArrayOutputStream#count
     */
    public synchronized int size() {
        return count;
    }

    /**
     * Converts the buffer's contents into a string decoding bytes using the
     * platform's default character set. The length of the new <tt>String</tt>
     * is a function of the character set, and hence may not be equal to the
     * size of the buffer.
     * <p/>
     * <p> This method always replaces malformed-input and unmappable-character
     * sequences with the default replacement string for the platform's
     * default character set. The {@linkplain java.nio.charset.CharsetDecoder}
     * class should be used when more control over the decoding process is
     * required.
     *
     * @return String decoded from the buffer's contents.
     * @since JDK1.1
     */
    public synchronized String toString() {
        return new String(buf, 0, count);
    }


    /**
     * Closing a <tt>ByteArrayOutputStream</tt> has no effect. The methods in
     * this class can be called after the stream has been closed without
     * generating an <tt>IOException</tt>.
     */
    public void close() throws IOException {
    }

    /**
     * Returns the last index that is available.
     *
     * @return
     */
    public synchronized long available() {
        return startOffset + count;
    }

    public synchronized void discardTo(long n) {
        System.arraycopy(buf, l2i(n - startOffset), buf, 0, l2i(buf.length - (n - startOffset)));
        count -= (n - startOffset);
        startOffset = n;
    }

}
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