/*
 * 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.olingo.server.core.batchhandler;

import org.apache.olingo.commons.api.http.HttpHeader;
import org.apache.olingo.commons.api.http.HttpMethod;
import org.apache.olingo.server.api.ODataRequest;
import org.apache.olingo.server.api.ODataResponse;
import org.apache.olingo.server.api.batch.BatchFacade;
import org.apache.olingo.server.api.batch.exception.BatchDeserializerException;
import org.apache.olingo.server.api.batch.exception.BatchDeserializerException.MessageKeys;
import org.apache.olingo.server.api.deserializer.DeserializerException;
import org.apache.olingo.server.api.processor.BatchProcessor;
import org.apache.olingo.server.api.serializer.SerializerException;
import org.apache.olingo.server.core.ODataHandler;
import org.apache.olingo.server.core.deserializer.batch.BatchParserCommon;

public class BatchHandler {
  private final BatchProcessor batchProcessor;
  private final ODataHandler oDataHandler;
  
  public BatchHandler(final ODataHandler oDataHandler, final BatchProcessor batchProcessor) {

    this.batchProcessor = batchProcessor;
    this.oDataHandler = oDataHandler;
  }

  public void process(final ODataRequest request, final ODataResponse response, final boolean isStrict)
      throws DeserializerException, SerializerException {
    validateRequest(request);
    
    final BatchFacade operation = new BatchFascadeImpl(oDataHandler, request, batchProcessor, isStrict);
    batchProcessor.processBatch(operation, request, response);
  }

  private void validateRequest(final ODataRequest request) throws BatchDeserializerException {
    validateHttpMethod(request);
    validateContentType(request);
  }

  private void validateContentType(final ODataRequest request) throws BatchDeserializerException {
    final String contentType = request.getHeader(HttpHeader.CONTENT_TYPE);

    if (contentType == null || !BatchParserCommon.PATTERN_MULTIPART_BOUNDARY.matcher(contentType).matches()) {
      throw new BatchDeserializerException("Invalid content type", MessageKeys.INVALID_CONTENT_TYPE, 0);
    }
  }

  private void validateHttpMethod(final ODataRequest request) throws BatchDeserializerException {
    if (request.getMethod() != HttpMethod.POST) {
      throw new BatchDeserializerException("Invalid HTTP method", MessageKeys.INVALID_METHOD, 0);
    }
  }
}