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/*
 * Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.grizzly.http.util;

import static org.glassfish.grizzly.utils.Charsets.UTF8_CHARSET;

import java.io.CharConversionException;
import java.nio.charset.Charset;

import org.glassfish.grizzly.Buffer;
import org.glassfish.grizzly.memory.Buffers;

/**
 * Request URI holder. Contains 3 types of URI: 1) Original, which represents the URI's original state at time it was
 * set. 2) Decoded, which has represents URI after being URI and String decoded (internally used by Mapper). 3) Actual,
 * which is supposed as URI value returned to user.
 *
 * @author Alexey Stashok
 */
public class RequestURIRef {
    private boolean isDecoded;
    private Charset decodedURIEncoding;
    private boolean wasSlashAllowed = true;

    private Charset defaultURIEncoding = UTF8_CHARSET;

    // Original Request URI
    private final DataChunk originalRequestURIDC = DataChunk.newInstance();
    // Actual Request URI
    private final DataChunk requestURIDC = new DataChunk() {
        @Override
        public void notifyDirectUpdate() {
            if (type == Type.Buffer) {
                final int start = getStart();
                final int end = getEnd();

                final byte[] bytes = new byte[end - start];

                final Buffer currentBuffer = getBufferChunk().getBuffer();
                final int pos = currentBuffer.position();
                final int lim = currentBuffer.limit();

                Buffers.setPositionLimit(currentBuffer, start, end);
                currentBuffer.get(bytes);
                Buffers.setPositionLimit(currentBuffer, pos, lim);

                setBytes(bytes);
            }
        }
    };

    // Decoded Request URI
    private final DataChunk decodedRequestURIDC = DataChunk.newInstance();

    private byte[] preallocatedDecodedURIBuffer;

    public void init(final Buffer input, final int start, final int end) {
        originalRequestURIDC.setBuffer(input, start, end);
        requestURIDC.setBuffer(input, start, end);
    }

    public void init(final byte[] input, final int start, final int end) {
        originalRequestURIDC.setBytes(input, start, end);
        requestURIDC.setBytes(input, start, end);
    }

    public void init(final String requestUri) {
        originalRequestURIDC.setString(requestUri);
        requestURIDC.setString(requestUri);
    }

    public final DataChunk getOriginalRequestURIBC() {
        return originalRequestURIDC;
    }

    public final DataChunk getRequestURIBC() {
        return requestURIDC;
    }

    public final DataChunk getDecodedRequestURIBC() throws CharConversionException {
        return getDecodedRequestURIBC(wasSlashAllowed, defaultURIEncoding);
    }

    public DataChunk getDecodedRequestURIBC(boolean isSlashAllowed) throws CharConversionException {
        return getDecodedRequestURIBC(isSlashAllowed, defaultURIEncoding);
    }

    public DataChunk getDecodedRequestURIBC(final boolean isSlashAllowed, final Charset charset) throws CharConversionException {

        if (isDecoded && isSlashAllowed == wasSlashAllowed && charset == decodedURIEncoding) {
            return decodedRequestURIDC;
        }

        checkDecodedURICapacity(requestURIDC.getLength());
        decodedRequestURIDC.setBytes(preallocatedDecodedURIBuffer);

        HttpRequestURIDecoder.decode(requestURIDC, decodedRequestURIDC, isSlashAllowed, charset);

        isDecoded = true;
        wasSlashAllowed = isSlashAllowed;

        decodedURIEncoding = charset;
        return decodedRequestURIDC;
    }

    public String getURI() {
        return getURI(null);
    }

    public String getURI(final Charset encoding) {
        return getRequestURIBC().toString(encoding);
    }

    public void setURI(final String uri) {
        getRequestURIBC().setString(uri);
    }

    public final String getDecodedURI() throws CharConversionException {
        return getDecodedURI(wasSlashAllowed);
    }

    public final String getDecodedURI(final boolean isSlashAllowed) throws CharConversionException {
        return getDecodedURI(isSlashAllowed, defaultURIEncoding);
    }

    public String getDecodedURI(final boolean isSlashAllowed, Charset encoding) throws CharConversionException {

        getDecodedRequestURIBC(isSlashAllowed, encoding);

        return decodedRequestURIDC.toString();
    }

    public void setDecodedURI(String uri) {
        decodedRequestURIDC.setString(uri);
        isDecoded = true;
    }

    public boolean isDecoded() {
        return isDecoded;
    }

    public Charset getDefaultURIEncoding() {
        return defaultURIEncoding;
    }

    public void setDefaultURIEncoding(Charset defaultURIEncoding) {
        this.defaultURIEncoding = defaultURIEncoding;
    }

    public void recycle() {
        originalRequestURIDC.recycle();
        decodedRequestURIDC.recycle();
        requestURIDC.recycle();

        isDecoded = false;
        wasSlashAllowed = true;
        decodedURIEncoding = null;
        defaultURIEncoding = UTF8_CHARSET;
    }

    private void checkDecodedURICapacity(final int size) {
        if (preallocatedDecodedURIBuffer == null || preallocatedDecodedURIBuffer.length < size) {
            // for static allocation it's better to wrap byte[]
            preallocatedDecodedURIBuffer = new byte[size];
        }
    }
}