/*
 * 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.samoa.topology.impl;

import com.github.javacliparser.ClassOption;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;

import org.apache.samoa.tasks.Task;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;

/**
 * Utility class for samoa-storm project. It is used by StormDoTask to process its arguments.
 * 
 * @author Arinto Murdopo
 * 
 */
public class StormSamoaUtils {

  private static final Logger logger = LoggerFactory.getLogger(StormSamoaUtils.class);

  static final String KEY_FIELD = "key";
  static final String CONTENT_EVENT_FIELD = "content_event";

  static Properties getProperties() throws IOException {
    Properties props = new Properties();
    InputStream is = null;

    File f = new File("../bin/samoa-storm.properties");

    try {
      is = new FileInputStream(f);
      props.load(is);
    } catch (IOException e1) {
      System.out.println("Fail to load samoa-storm property file");
      return null;
    } finally {
      if (is != null) {
        is.close();
      }
    }

    return props;
  }

  public static StormTopology argsToTopology(String[] args) {
    StringBuilder cliString = new StringBuilder();
    for (String arg : args) {
      cliString.append(" ").append(arg);
    }
    logger.debug("Command line string = {}", cliString.toString());

    Task task = getTask(cliString.toString());

    // TODO: remove setFactory method with DynamicBinding
    task.setFactory(new StormComponentFactory());
    task.init();

    return (StormTopology) task.getTopology();
  }

  public static int numWorkers(List<String> tmpArgs) {
    int position = tmpArgs.size() - 1;
    int numWorkers;

    try {
      numWorkers = Integer.parseInt(tmpArgs.get(position));
      tmpArgs.remove(position);
    } catch (NumberFormatException e) {
      numWorkers = 4;
    }

    return numWorkers;
  }

  public static Task getTask(String cliString) {
    Task task = null;
    try {
      logger.debug("Providing task [{}]", cliString);
      task = ClassOption.cliStringToObject(cliString, Task.class, null);
    } catch (Exception e) {
      logger.warn("Fail in initializing the task!");
      e.printStackTrace();
    }
    return task;
  }

 public static Configuration getPropertyConfig(String configPropertyPath){
     Configuration config = null;
	try {
	config = new PropertiesConfiguration(configPropertyPath);
	  if (null == config || config.isEmpty()) {
	     logger.error("Configuration is null or empty at file  = {}",configPropertyPath);
	     throw new RuntimeException("Configuration is null or empty : " + configPropertyPath);       	    
	     }
	}
	catch(ConfigurationException configurationException)
	{
	     logger.error("ConfigurationException while reading property file = {}",configurationException);
	     throw new RuntimeException("ConfigurationException while reading property file : " + configPropertyPath);
	}
	return config;
	}
}