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/**
 * Copyright (C) 2000-2017 Atomikos 
 *
 * LICENSE CONDITIONS
 *
 * See http://www.atomikos.com/Main/WhichLicenseApplies for details.
 */

package com.atomikos.icatch.tcc.rest;

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
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.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import javax.ws.rs.ext.Providers;

import com.atomikos.logging.Logger;
import com.atomikos.logging.LoggerFactory;
import com.atomikos.tcc.rest.Transaction;

@Consumes(MimeTypes.MIME_TYPE_COORDINATOR_JSON)
@Produces(MimeTypes.MIME_TYPE_COORDINATOR_JSON)
@Provider
public class TransactionProvider implements MessageBodyWriter, MessageBodyReader {

	private static final Logger LOGGER = LoggerFactory.createLogger(TransactionProvider.class);
	@Context
	protected Providers providers;

	public long getSize(Transaction l, Class type, Type genericType, Annotation[] annotations, MediaType mt) {
		return -1;
	}

	public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mt) {
		return Transaction.class.isAssignableFrom(type);
	}

	@Override
	public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return Transaction.class.isAssignableFrom(type);
	}

	@Override
	public Transaction readFrom(Class type, Type genericType, Annotation[] annotations,
			MediaType mediaType, MultivaluedMap httpHeaders, InputStream entityStream)
			throws IOException, WebApplicationException {
		MediaType realMediaType = MediaType.APPLICATION_JSON_TYPE;
		MessageBodyReader reader = this.providers.getMessageBodyReader(type, genericType, annotations,
				realMediaType);
		InputStream in = entityStream;
		if (LOGGER.isTraceEnabled()) {
			String content = getStringFromInputStream(entityStream);
			LOGGER.logTrace("Incoming REST request payload:\n" + content);
			in = new ByteArrayInputStream(content.getBytes());
		}

		return reader.readFrom(type, genericType, annotations, realMediaType, httpHeaders, in);
	}

	private String getStringFromInputStream(InputStream is) {

		BufferedReader br = null;
		StringBuilder sb = new StringBuilder();

		String line;
		try {

			br = new BufferedReader(new InputStreamReader(is));
			while ((line = br.readLine()) != null) {
				sb.append(line);
			}

		} catch (IOException e) {
			LOGGER.logTrace("Failed to read REST payload.", e);
		} finally {
			if (br != null) {
				try {
					br.close();
				} catch (IOException e) {
					// ignore
				}
			}
		}

		return sb.toString();

	}

	@Override
	public void writeTo(Transaction t, Class type, Type genericType, Annotation[] annotations, MediaType mediaType,
			MultivaluedMap httpHeaders, OutputStream entityStream) throws IOException,
			WebApplicationException {
		MediaType realMediaType = MediaType.APPLICATION_JSON_TYPE;
		MessageBodyWriter writer = this.providers.getMessageBodyWriter(Transaction.class, genericType,
				annotations, realMediaType);

		writer.writeTo(t, type, genericType, annotations, realMediaType, httpHeaders, entityStream);

	}
}