/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.synapse.commons.formatters;

import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMOutputFormat;
import org.apache.axis2.AxisFault;
import org.apache.axis2.Constants;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.description.WSDL2Constants;
import org.apache.axis2.transport.MessageFormatter;
import org.apache.axis2.transport.http.HTTPConstants;
import org.apache.axis2.transport.http.util.URLTemplatingUtil;
import org.apache.axis2.util.JavaUtils;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Iterator;

/**
 * Formates the request message as application/x-www-form-urlencoded
 */
public class XFormURLEncodedFormatter implements MessageFormatter {

    public byte[] getBytes(MessageContext messageContext, OMOutputFormat format) throws AxisFault {

        OMElement omElement = messageContext.getEnvelope().getBody().getFirstElement();

        if (omElement != null) {
            Iterator it = omElement.getChildElements();
            String paraString = "";

            String encoding= format.getCharSetEncoding();
            if(encoding==null)    {
                encoding= "UTF-8";
            }
            while (it.hasNext()) {
                OMElement ele1 = (OMElement) it.next();

                String parameter;
                try {
                    parameter = ele1.getLocalName() + "=" + URLEncoder.encode(ele1.getText(),encoding).replace("+", "%20");
                } catch (UnsupportedEncodingException e) {
                    throw new IllegalArgumentException("UnsupportedEncoding for " + ele1.getText());
                }

                //    "2a" "_JsonReader_PD_2a" replace with ""
                //    "$a" "_JsonReader_PS_a" replace with $
                parameter = parameter.replace("_JsonReader_PD_","").replace("_JsonReader_PS_","$");
                paraString = "".equals(paraString) ? parameter : (paraString + "&" + parameter);
            }
            return paraString.getBytes();
        }

        return new byte[0];
    }

    public void writeTo(MessageContext messageContext, OMOutputFormat format,
                        OutputStream outputStream, boolean preserve) throws AxisFault {

        try {
            outputStream.write(getBytes(messageContext, format));
        } catch (IOException e) {
            throw new AxisFault("An error occured while writing the request");
        }
    }

    public String getContentType(MessageContext messageContext, OMOutputFormat format,
                                 String soapAction) {

        String encoding = format.getCharSetEncoding();
        String contentType = HTTPConstants.MEDIA_TYPE_X_WWW_FORM;

        if (encoding != null) {
            contentType += "; charset=" + encoding;
        }

        // if soap action is there (can be there is soap response MEP is used) add it.
        if ((soapAction != null)
                && !"".equals(soapAction.trim())
                && !"\"\"".equals(soapAction.trim())) {
            contentType = contentType + ";action=\"" + soapAction + "\";";
        }

        return contentType;
    }

    public URL getTargetAddress(MessageContext messageContext, OMOutputFormat format, URL targetURL)
            throws AxisFault {

        // Check whether there is a template in the URL, if so we have to replace then with data
        // values and create a new target URL.
        targetURL = URLTemplatingUtil.getTemplatedURL(targetURL, messageContext, true);
        String ignoreUncited =
                (String) messageContext.getProperty(WSDL2Constants.ATTR_WHTTP_IGNORE_UNCITED);

        // Need to have this check here cause         
        if (ignoreUncited == null || !JavaUtils.isTrueExplicitly(ignoreUncited)) {
            String httpMethod = (String) messageContext.getProperty(Constants.Configuration.HTTP_METHOD);
            if (Constants.Configuration.HTTP_METHOD_GET.equals(httpMethod) || Constants.Configuration.HTTP_METHOD_DELETE.equals(httpMethod)) {
                targetURL = URLTemplatingUtil.appendQueryParameters(messageContext, targetURL);
            }
        } else {
            messageContext.getEnvelope().getBody().getFirstElement().detach();
        }

        return targetURL;
    }

    public String formatSOAPAction(MessageContext messageContext, OMOutputFormat format,
                                   String soapAction) {
        return soapAction;
    }
}