//
//  ========================================================================
//  Copyright (c) 1995-2014 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.http;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import org.eclipse.jetty.io.Buffer;
import org.eclipse.jetty.io.BufferCache;
import org.eclipse.jetty.io.BufferCache.CachedBuffer;
import org.eclipse.jetty.util.StringUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/* ------------------------------------------------------------ */
/** 
 * 
 */
public class MimeTypes
{
	private static final Logger LOG = LoggerFactory.getLogger(MimeTypes.class);

	public final static String
	  FORM_ENCODED="application/x-www-form-urlencoded",
	  MESSAGE_HTTP="message/http",
	  MULTIPART_BYTERANGES="multipart/byteranges",
	  
	  TEXT_HTML="text/html",
	  TEXT_PLAIN="text/plain",
	  TEXT_XML="text/xml",
	  TEXT_JSON="text/json",
	  
	  TEXT_HTML_8859_1="text/html;charset=ISO-8859-1",
	  TEXT_PLAIN_8859_1="text/plain;charset=ISO-8859-1",
	  TEXT_XML_8859_1="text/xml;charset=ISO-8859-1",
	  
	  TEXT_HTML_UTF_8="text/html;charset=UTF-8",
	  TEXT_PLAIN_UTF_8="text/plain;charset=UTF-8",
	  TEXT_XML_UTF_8="text/xml;charset=UTF-8",
	  TEXT_JSON_UTF_8="text/json;charset=UTF-8";

	private final static String
	  TEXT_HTML__8859_1="text/html; charset=ISO-8859-1",
	  TEXT_PLAIN__8859_1="text/plain; charset=ISO-8859-1",
	  TEXT_XML__8859_1="text/xml; charset=ISO-8859-1",
	  TEXT_HTML__UTF_8="text/html; charset=UTF-8",
	  TEXT_PLAIN__UTF_8="text/plain; charset=UTF-8",
	  TEXT_XML__UTF_8="text/xml; charset=UTF-8",
	  TEXT_JSON__UTF_8="text/json; charset=UTF-8";

	private final static int
	FORM_ENCODED_ORDINAL=1,
		MESSAGE_HTTP_ORDINAL=2,
		MULTIPART_BYTERANGES_ORDINAL=3,
		
		TEXT_HTML_ORDINAL=4,
	TEXT_PLAIN_ORDINAL=5,
	TEXT_XML_ORDINAL=6,
		TEXT_JSON_ORDINAL=7,
	
		TEXT_HTML_8859_1_ORDINAL=8,
		TEXT_PLAIN_8859_1_ORDINAL=9,
		TEXT_XML_8859_1_ORDINAL=10,
		
		TEXT_HTML_UTF_8_ORDINAL=11,
		TEXT_PLAIN_UTF_8_ORDINAL=12,
		TEXT_XML_UTF_8_ORDINAL=13,
		TEXT_JSON_UTF_8_ORDINAL=14;
	
	private static int __index=15;
	
	public final static BufferCache CACHE = new BufferCache(); 

	public final static CachedBuffer
		FORM_ENCODED_BUFFER=CACHE.add(FORM_ENCODED,FORM_ENCODED_ORDINAL),
		MESSAGE_HTTP_BUFFER=CACHE.add(MESSAGE_HTTP, MESSAGE_HTTP_ORDINAL),
		MULTIPART_BYTERANGES_BUFFER=CACHE.add(MULTIPART_BYTERANGES,MULTIPART_BYTERANGES_ORDINAL),
		
		TEXT_HTML_BUFFER=CACHE.add(TEXT_HTML,TEXT_HTML_ORDINAL),
		TEXT_PLAIN_BUFFER=CACHE.add(TEXT_PLAIN,TEXT_PLAIN_ORDINAL),
		TEXT_XML_BUFFER=CACHE.add(TEXT_XML,TEXT_XML_ORDINAL),
		TEXT_JSON_BUFFER=CACHE.add(TEXT_JSON,TEXT_JSON_ORDINAL),

		TEXT_HTML_8859_1_BUFFER=CACHE.add(TEXT_HTML_8859_1,TEXT_HTML_8859_1_ORDINAL),
		TEXT_PLAIN_8859_1_BUFFER=CACHE.add(TEXT_PLAIN_8859_1,TEXT_PLAIN_8859_1_ORDINAL),
		TEXT_XML_8859_1_BUFFER=CACHE.add(TEXT_XML_8859_1,TEXT_XML_8859_1_ORDINAL),
		
		TEXT_HTML_UTF_8_BUFFER=CACHE.add(TEXT_HTML_UTF_8,TEXT_HTML_UTF_8_ORDINAL),
		TEXT_PLAIN_UTF_8_BUFFER=CACHE.add(TEXT_PLAIN_UTF_8,TEXT_PLAIN_UTF_8_ORDINAL),
		TEXT_XML_UTF_8_BUFFER=CACHE.add(TEXT_XML_UTF_8,TEXT_XML_UTF_8_ORDINAL),
		TEXT_JSON_UTF_8_BUFFER=CACHE.add(TEXT_JSON_UTF_8,TEXT_JSON_UTF_8_ORDINAL),

		TEXT_HTML__8859_1_BUFFER=CACHE.add(TEXT_HTML__8859_1,TEXT_HTML_8859_1_ORDINAL),
		TEXT_PLAIN__8859_1_BUFFER=CACHE.add(TEXT_PLAIN__8859_1,TEXT_PLAIN_8859_1_ORDINAL),
		TEXT_XML__8859_1_BUFFER=CACHE.add(TEXT_XML__8859_1,TEXT_XML_8859_1_ORDINAL),
		
		TEXT_HTML__UTF_8_BUFFER=CACHE.add(TEXT_HTML__UTF_8,TEXT_HTML_UTF_8_ORDINAL),
		TEXT_PLAIN__UTF_8_BUFFER=CACHE.add(TEXT_PLAIN__UTF_8,TEXT_PLAIN_UTF_8_ORDINAL),
		TEXT_XML__UTF_8_BUFFER=CACHE.add(TEXT_XML__UTF_8,TEXT_XML_UTF_8_ORDINAL),
		TEXT_JSON__UTF_8_BUFFER=CACHE.add(TEXT_JSON__UTF_8,TEXT_JSON_UTF_8_ORDINAL);

	
	/* ------------------------------------------------------------ */
	/* ------------------------------------------------------------ */
	private final static Map __dftMimeMap = new HashMap();
	private final static Map __encodings = new HashMap();
	static
	{
		try
		{
			ResourceBundle mime = ResourceBundle.getBundle("org/eclipse/jetty/http/mime");
			Enumeration i = mime.getKeys();
			while(i.hasMoreElements())
			{
				String ext = (String)i.nextElement();
				String m = mime.getString(ext);
				__dftMimeMap.put(StringUtil.asciiToLowerCase(ext),normalizeMimeType(m));
			}
		}
		catch(MissingResourceException e)
		{
			LOG.warn(e.toString());
			LOG.debug("",e);
		}

		try
		{
			ResourceBundle encoding = ResourceBundle.getBundle("org/eclipse/jetty/http/encoding");
			Enumeration i = encoding.getKeys();
			while(i.hasMoreElements())
			{
				Buffer type = normalizeMimeType((String)i.nextElement());
				__encodings.put(type,encoding.getString(type.toString()));
			}
		}
		catch(MissingResourceException e)
		{
			LOG.warn(e.toString());
			LOG.debug("",e);
		}

		
		TEXT_HTML_BUFFER.setAssociate("ISO-8859-1",TEXT_HTML_8859_1_BUFFER);
		TEXT_HTML_BUFFER.setAssociate("ISO_8859_1",TEXT_HTML_8859_1_BUFFER);
		TEXT_HTML_BUFFER.setAssociate("iso-8859-1",TEXT_HTML_8859_1_BUFFER);
		TEXT_PLAIN_BUFFER.setAssociate("ISO-8859-1",TEXT_PLAIN_8859_1_BUFFER);
		TEXT_PLAIN_BUFFER.setAssociate("ISO_8859_1",TEXT_PLAIN_8859_1_BUFFER);
		TEXT_PLAIN_BUFFER.setAssociate("iso-8859-1",TEXT_PLAIN_8859_1_BUFFER);
		TEXT_XML_BUFFER.setAssociate("ISO-8859-1",TEXT_XML_8859_1_BUFFER);
		TEXT_XML_BUFFER.setAssociate("ISO_8859_1",TEXT_XML_8859_1_BUFFER);
		TEXT_XML_BUFFER.setAssociate("iso-8859-1",TEXT_XML_8859_1_BUFFER);

		TEXT_HTML_BUFFER.setAssociate("UTF-8",TEXT_HTML_UTF_8_BUFFER);
		TEXT_HTML_BUFFER.setAssociate("UTF8",TEXT_HTML_UTF_8_BUFFER);
		TEXT_HTML_BUFFER.setAssociate("utf8",TEXT_HTML_UTF_8_BUFFER);
		TEXT_HTML_BUFFER.setAssociate("utf-8",TEXT_HTML_UTF_8_BUFFER);
		TEXT_PLAIN_BUFFER.setAssociate("UTF-8",TEXT_PLAIN_UTF_8_BUFFER);
		TEXT_PLAIN_BUFFER.setAssociate("UTF8",TEXT_PLAIN_UTF_8_BUFFER);
		TEXT_PLAIN_BUFFER.setAssociate("utf8",TEXT_PLAIN_UTF_8_BUFFER);
		TEXT_PLAIN_BUFFER.setAssociate("utf-8",TEXT_PLAIN_UTF_8_BUFFER);
		TEXT_XML_BUFFER.setAssociate("UTF-8",TEXT_XML_UTF_8_BUFFER);
		TEXT_XML_BUFFER.setAssociate("UTF8",TEXT_XML_UTF_8_BUFFER);
		TEXT_XML_BUFFER.setAssociate("utf8",TEXT_XML_UTF_8_BUFFER);
		TEXT_XML_BUFFER.setAssociate("utf-8",TEXT_XML_UTF_8_BUFFER);
		TEXT_JSON_BUFFER.setAssociate("UTF-8",TEXT_JSON_UTF_8_BUFFER);
		TEXT_JSON_BUFFER.setAssociate("UTF8",TEXT_JSON_UTF_8_BUFFER);
		TEXT_JSON_BUFFER.setAssociate("utf8",TEXT_JSON_UTF_8_BUFFER);
		TEXT_JSON_BUFFER.setAssociate("utf-8",TEXT_JSON_UTF_8_BUFFER);
	}


	/* ------------------------------------------------------------ */
	private Map _mimeMap;
	
	/* ------------------------------------------------------------ */
	/** Constructor.
	 */
	public MimeTypes()
	{
	}

	/* ------------------------------------------------------------ */
	public synchronized Map getMimeMap()
	{
		return _mimeMap;
	}

	/* ------------------------------------------------------------ */
	/**
	 * @param mimeMap A Map of file extension to mime-type.
	 */
	public void setMimeMap(Map mimeMap)
	{
		if (mimeMap==null)
		{
			_mimeMap=null;
			return;
		}
		
		Map m=new HashMap();
		Iterator i=mimeMap.entrySet().iterator();
		while (i.hasNext())
		{
			Map.Entry entry = (Map.Entry)i.next();
			m.put(entry.getKey(),normalizeMimeType(entry.getValue().toString()));
		}
		_mimeMap=m;
	}

	/* ------------------------------------------------------------ */
	/** Get the MIME type by filename extension.
	 * @param filename A file name
	 * @return MIME type matching the longest dot extension of the
	 * file name.
	 */
	public Buffer getMimeByExtension(String filename)
	{
		Buffer type=null;

		if (filename!=null)
		{
			int i=-1;
			while(type==null)
			{
				i=filename.indexOf(".",i+1);

				if (i<0 || i>=filename.length())
					break;

				String ext=StringUtil.asciiToLowerCase(filename.substring(i+1));
				if (_mimeMap!=null)
					type = (Buffer)_mimeMap.get(ext);
				if (type==null)
					type=(Buffer)__dftMimeMap.get(ext);
			}
		}

		if (type==null)
		{
			if (_mimeMap!=null)
				type=(Buffer)_mimeMap.get("*");
			 if (type==null)
				 type=(Buffer)__dftMimeMap.get("*");
		}

		return type;
	}

	/* ------------------------------------------------------------ */
	/** Set a mime mapping
	 * @param extension
	 * @param type
	 */
	public void addMimeMapping(String extension,String type)
	{
		if (_mimeMap==null)
			_mimeMap=new HashMap();
		
		_mimeMap.put(StringUtil.asciiToLowerCase(extension),normalizeMimeType(type));
	}

	/* ------------------------------------------------------------ */
	private static synchronized Buffer normalizeMimeType(String type)
	{
		Buffer b =CACHE.get(type);
		if (b==null)
			b=CACHE.add(type,__index++);
		return b;
	}

	/* ------------------------------------------------------------ */
	public static String getCharsetFromContentType(Buffer value)
	{
		if (value instanceof CachedBuffer)
		{
			switch(((CachedBuffer)value).getOrdinal())
			{
				case TEXT_HTML_8859_1_ORDINAL:
				case TEXT_PLAIN_8859_1_ORDINAL:
				case TEXT_XML_8859_1_ORDINAL:
					return StringUtil.__ISO_8859_1;

				case TEXT_HTML_UTF_8_ORDINAL:
				case TEXT_PLAIN_UTF_8_ORDINAL:
				case TEXT_XML_UTF_8_ORDINAL:
				case TEXT_JSON_UTF_8_ORDINAL:
					return StringUtil.__UTF8;
			}
		}
		
		int i=value.getIndex();
		int end=value.putIndex();
		int state=0;
		int start=0;
		boolean quote=false;
		for (;i<end;i++)
		{
			byte b = value.peek(i);
			
			if (quote && state!=10)
			{
				if ('"'==b)
					quote=false;
				continue;
			}
				
			switch(state)
			{
				case 0:
					if ('"'==b)
					{
						quote=true;
						break;
					}
					if (';'==b)
						state=1;
					break;

				case 1: if ('c'==b) state=2; else if (' '!=b) state=0; break;
				case 2: if ('h'==b) state=3; else state=0;break;
				case 3: if ('a'==b) state=4; else state=0;break;
				case 4: if ('r'==b) state=5; else state=0;break;
				case 5: if ('s'==b) state=6; else state=0;break;
				case 6: if ('e'==b) state=7; else state=0;break;
				case 7: if ('t'==b) state=8; else state=0;break;

				case 8: if ('='==b) state=9; else if (' '!=b) state=0; break;
				
				case 9: 
					if (' '==b) 
						break;
					if ('"'==b) 
					{
						quote=true;
						start=i+1;
						state=10;
						break;
					}
					start=i;
					state=10;
					break;
					
				case 10:
					if (!quote && (';'==b || ' '==b )||
						(quote && '"'==b ))
						return CACHE.lookup(value.peek(start,i-start)).toString(StringUtil.__UTF8);
			}
		}    
		
		if (state==10)
			return CACHE.lookup(value.peek(start,i-start)).toString(StringUtil.__UTF8);
		
		return (String)__encodings.get(value);
	}
}