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//
//  ========================================================================
//  Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//


package org.eclipse.jetty.http2.hpack;


import org.eclipse.jetty.http.BadMessageException;
import org.eclipse.jetty.http.HostPortHttpField;
import org.eclipse.jetty.http.HttpField;
import org.eclipse.jetty.http.HttpFields;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.HttpScheme;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.http.MetaData;

public class MetaDataBuilder
{
    private final int _maxSize;
    private int _size;
    private int _status;
    private String _method;
    private HttpScheme _scheme;
    private HostPortHttpField _authority;
    private String _path;
    private long _contentLength=Long.MIN_VALUE;
    private HttpFields _fields = new HttpFields(10);

    /**
     * @param maxHeadersSize The maximum size of the headers, expressed as total name and value characters.
     */
    MetaDataBuilder(int maxHeadersSize)
    {
        _maxSize=maxHeadersSize;
    }

    /** Get the maxSize.
     * @return the maxSize
     */
    public int getMaxSize()
    {
        return _maxSize;
    }

    /** Get the size.
     * @return the current size in bytes
     */
    public int getSize()
    {
        return _size;
    }

    public void emit(HttpField field)
    {
        HttpHeader header = field.getHeader();
        String name = field.getName();
        String value = field.getValue();
        int field_size = name.length() + (value == null ? 0 : value.length());
        _size+=field_size+32;
        if (_size>_maxSize)
            throw new BadMessageException(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE_431,"Header size "+_size+">"+_maxSize);

        if (field instanceof StaticTableHttpField)
        {
            StaticTableHttpField staticField = (StaticTableHttpField)field;
            switch(header)
            {
                case C_STATUS:
                    _status=(Integer)staticField.getStaticValue();
                    break;

                case C_METHOD:
                    _method=value;
                    break;

                case C_SCHEME:
                    _scheme = (HttpScheme)staticField.getStaticValue();
                    break;

                default:
                    throw new IllegalArgumentException(name);
            }
        }
        else if (header!=null)
        {
            switch(header)
            {
                case C_STATUS:
                    _status=field.getIntValue();
                    break;

                case C_METHOD:
                    _method=value;
                    break;

                case C_SCHEME:
                    if (value != null)
                        _scheme = HttpScheme.CACHE.get(value);
                    break;

                case C_AUTHORITY:
                    if (field instanceof HostPortHttpField)
                        _authority = (HostPortHttpField)field;
                    else if (value != null)
                        _authority = new AuthorityHttpField(value);
                    break;

                case HOST:
                    // :authority fields must come first.  If we have one, ignore the host header as far as authority goes.
                    if (_authority==null)
                    {
                        if (field instanceof HostPortHttpField)
                            _authority = (HostPortHttpField)field;
                        else if (value != null)
                            _authority = new AuthorityHttpField(value);
                    }
                    _fields.add(field);
                    break;

                case C_PATH:
                    _path = value;
                    break;

                case CONTENT_LENGTH:
                    _contentLength = field.getLongValue();
                    _fields.add(field);
                    break;

                default:
                    if (name.charAt(0)!=':')
                        _fields.add(field);
                    break;
            }
        }
        else
        {
            if (name.charAt(0)!=':')
                _fields.add(field);
        }
    }

    public MetaData build()
    {
        try
        {
            HttpFields fields = _fields;
            _fields = new HttpFields(Math.max(10,fields.size()+5));

            if (_method!=null)
                return new MetaData.Request(_method,_scheme,_authority,_path,HttpVersion.HTTP_2,fields,_contentLength);
            if (_status!=0)
                return new MetaData.Response(HttpVersion.HTTP_2,_status,fields,_contentLength);
            if (_path!=null)
                fields.put(HttpHeader.C_PATH,_path);
            if (_authority!=null)
                fields.put(HttpHeader.HOST,_authority.getValue());
                
            return new MetaData(HttpVersion.HTTP_2,fields,_contentLength);
        }
        finally
        {
            _status=0;
            _method=null;
            _scheme=null;
            _authority=null;
            _path=null;
            _size=0;
            _contentLength=Long.MIN_VALUE;
        }
    }

    /**
     * Check that the max size will not be exceeded.
     * @param length the length
     * @param huffman the huffman name
     */
    public void checkSize(int length, boolean huffman)
    {
        // Apply a huffman fudge factor
        if (huffman)
            length=(length*4)/3;
        if ((_size+length)>_maxSize)
            throw new BadMessageException(HttpStatus.REQUEST_HEADER_FIELDS_TOO_LARGE_431,"Header size "+(_size+length)+">"+_maxSize);
    }
}