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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2013 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
 * http://glassfish.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:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
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 *
 * Modifications:
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package org.glassfish.jersey.message.internal;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;

import javax.ws.rs.BadRequestException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;


/**
 * Abstract base class for form entity types marshalling & un-marshalling support.
 *
 * @param  form type.
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public abstract class AbstractFormProvider extends AbstractMessageReaderWriterProvider {

    public > M readFrom(M map,
                                                                 MediaType mediaType, boolean decode,
                                                                 InputStream entityStream) throws IOException {
        final String encoded = readFromAsString(entityStream, mediaType);

        final String charsetName = ReaderWriter.getCharset(mediaType).name();

        final StringTokenizer tokenizer = new StringTokenizer(encoded, "&");
        String token;
        try {
            while (tokenizer.hasMoreTokens()) {
                token = tokenizer.nextToken();
                int idx = token.indexOf('=');
                if (idx < 0) {
                    map.add(decode ? URLDecoder.decode(token, charsetName) : token, null);
                } else if (idx > 0) {
                    if (decode) {
                        map.add(URLDecoder.decode(token.substring(0, idx), charsetName),
                                URLDecoder.decode(token.substring(idx + 1), charsetName));
                    } else {
                        map.add(token.substring(0, idx), token.substring(idx + 1));
                    }
                }
            }
            return map;
        } catch (IllegalArgumentException ex) {
            throw new BadRequestException(ex);
        }
    }

    public > void writeTo(
            M t,
            MediaType mediaType,
            OutputStream entityStream) throws IOException {
        final String charsetName = ReaderWriter.getCharset(mediaType).name();

        final StringBuilder sb = new StringBuilder();
        for (Map.Entry> e : t.entrySet()) {
            for (String value : e.getValue()) {
                if (sb.length() > 0) {
                    sb.append('&');
                }
                sb.append(URLEncoder.encode(e.getKey(), charsetName));
                if (value != null) {
                    sb.append('=');
                    sb.append(URLEncoder.encode(value, charsetName));
                }
            }
        }

        writeToAsString(sb.toString(), entityStream, mediaType);
    }
}