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/**
 * 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.cxf.jaxrs.client;

import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;

import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Providers;

import org.apache.cxf.jaxrs.ext.MessageContext;
import org.apache.cxf.message.Message;

public class ResponseReader implements MessageBodyReader {

    @Context
    private MessageContext context;
 
    private Class entityCls;
    private Type entityGenericType;
    
    public ResponseReader() {
        
    }
    
    public ResponseReader(Class entityCls) {
        this.entityCls = entityCls;
    }
    
    public boolean isReadable(Class cls, Type genericType, Annotation[] anns, MediaType mt) {
        return cls.isAssignableFrom(Response.class);
    }

    public Response readFrom(Class cls, Type genericType,
                             Annotation[] anns, MediaType mt,
        MultivaluedMap headers, InputStream is) 
        throws IOException, WebApplicationException {
        
        int status = Integer.valueOf(getContext().get(Message.RESPONSE_CODE).toString());
        
        ResponseBuilder rb = Response.status(status);
        
        for (String header : headers.keySet()) {
            List values = headers.get(header);
            for (String value : values) {
                rb.header(header, value);
            }
        }
        
        if (entityCls != null) {
            Object entity = readFrom(entityCls, anns, mt, headers, is);
            rb.entity(entity);
        }
        
        return rb.build();
    }
    private  T readFrom(Class type,  
               Annotation anns[], MediaType mt,
               MultivaluedMap headers, 
               InputStream is) throws IOException, WebApplicationException {
        
        Providers providers = getContext().getProviders();
        MessageBodyReader reader = 
            providers.getMessageBodyReader(type, getEntityGenericType(), anns, mt);
        if (reader == null) {
            throw new ClientWebApplicationException("No reader for Response entity "
                                                    + entityCls.getName());
        }
        
        return reader.readFrom(type, getEntityGenericType(), 
                               anns, mt, headers, is);
    }
       
    public void setEntityClass(Class cls) {
        entityCls = cls;
    }
    
    private Type getEntityGenericType() {
        return entityGenericType == null ? entityCls : entityGenericType; 
    }
    
    protected MessageContext getContext() {
        return context;
    }
}