/**
 * 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.hadoop.gateway.shell.job;

import com.jayway.jsonpath.JsonPath;
import org.apache.hadoop.gateway.shell.AbstractRequest;
import org.apache.hadoop.gateway.shell.BasicResponse;
import org.apache.hadoop.gateway.shell.Hadoop;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;

public class Pig {

  static class Request extends AbstractRequest<Response> {

    private String group;
    private String file;
    private String arg;
    private String statusDir;

    public Request( Hadoop session ) {
      super( session );
    }

    public Request group( String group ) {
      this.group = group;
      return this;
    }

    public Request file( String file ) {
      this.file = file;
      return this;
    }

    public Request arg( String arg ) {
      this.arg = arg;
      return this;
    }

    public Request statusDir( String dir ) {
      this.statusDir = dir;
      return this;
    }

    protected Callable<Response> callable() {
      return new Callable<Response>() {
        @Override
        public Response call() throws Exception {
          URIBuilder uri = uri( Job.SERVICE_PATH, "/pig" );
          List<NameValuePair> params = new ArrayList<NameValuePair>();
          addParam( params, "group", group );
          addParam( params, "file", file );
          addParam( params, "arg", arg );
          addParam( params, "statusdir", statusDir );
          UrlEncodedFormEntity form = new UrlEncodedFormEntity( params );
          HttpPost request = new HttpPost( uri.build() );
          request.setEntity( form );
          return new Response( execute( request ) );
        }
      };
    }

  }

  static class Response extends BasicResponse {

    protected Response( HttpResponse response ) {
      super( response );
    }

    public String getJobId() throws IOException {
      return JsonPath.read( getString(), "$.id" );
    }

  }

}
