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package ca.uhn.fhir.okhttp.client;

/*
 * #%L
 * HAPI FHIR OkHttp Client
 * %%
 * Copyright (C) 2014 - 2016 University Health Network
 * %%
 * Licensed 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.
 * #L%
 */

import ca.uhn.fhir.rest.client.api.IHttpResponse;
import ca.uhn.fhir.rest.server.Constants;
import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
import okhttp3.MediaType;
import okhttp3.Response;
import org.apache.commons.io.IOUtils;

import java.io.*;
import java.util.List;
import java.util.Map;

/**
 * Wraps an OkHttp {@link Response}
 *
 * @author Matthew Clarke | [email protected] | Orion Health
 */
public class OkHttpRestfulResponse implements IHttpResponse {

    private Response myResponse;
    private boolean myEntityBuffered = false;
    private byte[] myEntityBytes;

    public OkHttpRestfulResponse(Response theResponse) {
        this.myResponse = theResponse;
    }

    @Override
    public int getStatus() {
        return myResponse.code();
    }

    @Override
    public Object getResponse() {
        return myResponse;
    }

    @Override
    public String getMimeType() {
        String contentType = myResponse.header(Constants.HEADER_CONTENT_TYPE);
        MediaType mediaType = null;
        if (contentType == null) {
            if (myResponse.body() != null) {
                mediaType = myResponse.body().contentType();
            }
        } else {
            mediaType = MediaType.parse(contentType);
        }
        
        if (mediaType == null) {
            return null;
        }

        return typeAndSubtypeOnly(mediaType).toString();
    }

    private MediaType typeAndSubtypeOnly(MediaType input) {
        return MediaType.parse(input.type() + "/" + input.subtype());
    }

    @Override
    public Map> getAllHeaders() {
        return myResponse.headers().toMultimap();
    }

    @Override
    public String getStatusInfo() {
        return myResponse.message();
    }

    @Override
    public Reader createReader() throws IOException {
        if (!myEntityBuffered && myResponse.body() == null) {
            return new StringReader("");
        } else {
            return new InputStreamReader(readEntity());
        }
    }

    @Override
    public InputStream readEntity() throws IOException {
        if (this.myEntityBuffered) {
            return new ByteArrayInputStream(myEntityBytes);
        } else if (myResponse.body() != null) {
            return myResponse.body().byteStream();
        } else {
            return null;
        }
    }

    @Override
    public void close() {
        myResponse.close();
    }

    @Override
    public void bufferEntitity() throws IOException {
        if (myEntityBuffered) {
            return;
        }
        InputStream responseEntity = readEntity();
        if (responseEntity != null) {
            myEntityBuffered = true;
            try {
                myEntityBytes = IOUtils.toByteArray(responseEntity);
            } catch (IllegalStateException e) {
                throw new InternalErrorException(e);
            }
        }
    }

}