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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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/*
 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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package org.glassfish.grizzly.http2.hpack;


import org.glassfish.grizzly.Buffer;

abstract class IndexNameValueWriter implements BinaryRepresentationWriter {

    private final int pattern;
    private final int prefix;
    private final IntegerWriter intWriter = new IntegerWriter();
    private final StringWriter nameWriter = new StringWriter();
    private final StringWriter valueWriter = new StringWriter();

    protected boolean indexedRepresentation;

    private static final int NEW               = 0;
    private static final int NAME_PART_WRITTEN = 1;
    private static final int VALUE_WRITTEN     = 2;

    private int state = NEW;

    protected IndexNameValueWriter(int pattern, int prefix) {
        this.pattern = pattern;
        this.prefix = prefix;
    }

    IndexNameValueWriter index(int index) {
        indexedRepresentation = true;
        intWriter.configure(index, prefix, pattern);
        return this;
    }

    IndexNameValueWriter name(CharSequence name, boolean useHuffman) {
        indexedRepresentation = false;
        intWriter.configure(0, prefix, pattern);
        nameWriter.configure(name, useHuffman);
        return this;
    }

    IndexNameValueWriter value(CharSequence value, boolean useHuffman) {
        valueWriter.configure(value, useHuffman);
        return this;
    }

    @Override
    public boolean write(HeaderTable table, Buffer destination) {
        if (state < NAME_PART_WRITTEN) {
            if (indexedRepresentation) {
                if (!intWriter.write(destination)) {
                    return false;
                }
            } else {
                if (!intWriter.write(destination) || !nameWriter.write(destination)) {
                    return false;
                }
            }
            state = NAME_PART_WRITTEN;
        }
        if (state < VALUE_WRITTEN) {
            if (!valueWriter.write(destination)) {
                return false;
            }
            state = VALUE_WRITTEN;
        }
        return state == VALUE_WRITTEN;
    }

    @Override
    public IndexNameValueWriter reset() {
        intWriter.reset();
        if (!indexedRepresentation) {
            nameWriter.reset();
        }
        valueWriter.reset();
        state = NEW;
        return this;
    }
}