package com.yahoo.labs.samoa.topology.impl;

/*
 * #%L
 * SAMOA
 * %%
 * Copyright (C) 2014 - 2015 Apache Software Foundation
 * %%
 * 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%
 */

/**
 * License
 */

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.s4.base.Event;
import org.apache.s4.base.KeyFinder;
import org.apache.s4.core.App;
import org.apache.s4.core.ProcessingElement;
import org.apache.s4.core.Stream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.github.javacliparser.Option;
import com.github.javacliparser.ClassOption;
import com.yahoo.labs.samoa.core.Globals;
import com.yahoo.labs.samoa.tasks.Task;
import com.yahoo.labs.samoa.topology.ComponentFactory;

import com.google.inject.Inject;
import com.google.inject.name.Named;

/*
 * S4 App that runs samoa Tasks
 *
 * */

/**
 * The Class DoTaskApp.
 */
final public class S4DoTask extends App {

  private final Logger logger = LoggerFactory.getLogger(S4DoTask.class);
  Task task;

  @Inject
  @Named("evalTask")
  public String evalTask;

  public S4DoTask() {
    super();
  }

  /** The engine. */
  protected ComponentFactory componentFactory;

  /**
   * Gets the factory.
   * 
   * @return the factory
   */
  public ComponentFactory getFactory() {
    return componentFactory;
  }

  /**
   * Sets the factory.
   * 
   * @param factory
   *          the new factory
   */
  public void setFactory(ComponentFactory factory) {
    this.componentFactory = factory;
  }

  /*
   * Build the application
   * 
   * @see org.apache.s4.core.App#onInit()
   */
  /*
   * (non-Javadoc)
   * 
   * @see org.apache.s4.core.App#onInit()
   */
  @Override
  protected void onInit() {
    logger.info("DoTaskApp onInit");
    // ConsoleReporters prints S4 metrics
    // MetricsRegistry mr = new MetricsRegistry();
    //
    // CsvReporter.enable(new File(System.getProperty("user.home")
    // + "/monitor/"), 10, TimeUnit.SECONDS);
    // ConsoleReporter.enable(10, TimeUnit.SECONDS);
    try {
      System.err.println();
      System.err.println(Globals.getWorkbenchInfoString());
      System.err.println();

    } catch (Exception ex) {
      ex.printStackTrace();
    }
    S4ComponentFactory factory = new S4ComponentFactory();
    factory.setApp(this);

    // logger.debug("LC {}", lc);

    // task = TaskProvider.getTask(evalTask);

    // EXAMPLE OPTIONS
    // -l Clustream -g Clustream -i 100000 -s (RandomRBFGeneratorEvents -K
    // 5 -N 0.0)
    // String[] args = new String[] {evalTask,"-l", "Clustream","-g",
    // "Clustream", "-i", "100000", "-s", "(RamdomRBFGeneratorsEvents",
    // "-K", "5", "-N", "0.0)"};
    // String[] args = new String[] { evalTask, "-l", "clustream.Clustream",
    // "-g", "clustream.Clustream", "-i", "100000", "-s",
    // "(RandomRBFGeneratorEvents", "-K", "5", "-N", "0.0)" };
    logger.debug("PARAMETERS {}", evalTask);
    // params = params.replace(":", " ");
    List<String> parameters = new ArrayList<String>();
    // parameters.add(evalTask);
    try {
      parameters.addAll(Arrays.asList(URLDecoder.decode(evalTask, "UTF-8").split(" ")));
    } catch (UnsupportedEncodingException ex) {
      ex.printStackTrace();
    }
    String[] args = parameters.toArray(new String[0]);
    Option[] extraOptions = new Option[] {};
    // build a single string by concatenating cli options
    StringBuilder cliString = new StringBuilder();
    for (int i = 0; i < args.length; i++) {
      cliString.append(" ").append(args[i]);
    }

    // parse options
    try {
      task = (Task) ClassOption.cliStringToObject(cliString.toString(), Task.class, extraOptions);
      task.setFactory(factory);
      task.init();
    } catch (Exception e) {
      e.printStackTrace();
    }

  }

  /*
   * (non-Javadoc)
   * 
   * @see org.apache.s4.core.App#onStart()
   */
  @Override
  protected void onStart() {
    logger.info("Starting DoTaskApp... App Partition [{}]", this.getPartitionId());
    // <<<<<<< HEAD Task doesn't have start in latest storm-impl
    // TODO change the way the app starts
    // if (this.getPartitionId() == 0)
    S4Topology s4topology = (S4Topology) getTask().getTopology();
    S4EntranceProcessingItem epi = (S4EntranceProcessingItem) s4topology.getEntranceProcessingItem();
    while (epi.injectNextEvent())
      // inject events from the EntrancePI
      ;
  }

  /*
   * (non-Javadoc)
   * 
   * @see org.apache.s4.core.App#onClose()
   */
  @Override
  protected void onClose() {
    System.out.println("Closing DoTaskApp...");

  }

  /**
   * Gets the task.
   * 
   * @return the task
   */
  public Task getTask() {
    return task;
  }

  // These methods are protected in App and can not be accessed from outside.
  // They are
  // called from parallel classifiers and evaluations. Is there a better way
  // to do that?

  /*
   * (non-Javadoc)
   * 
   * @see org.apache.s4.core.App#createPE(java.lang.Class)
   */
  @Override
  public <T extends ProcessingElement> T createPE(Class<T> type) {
    return super.createPE(type);
  }

  /*
   * (non-Javadoc)
   * 
   * @see org.apache.s4.core.App#createStream(java.lang.String,
   * org.apache.s4.base.KeyFinder, org.apache.s4.core.ProcessingElement[])
   */
  @Override
  public <T extends Event> Stream<T> createStream(String name, KeyFinder<T> finder,
      ProcessingElement... processingElements) {
    return super.createStream(name, finder, processingElements);
  }

  /*
   * (non-Javadoc)
   * 
   * @see org.apache.s4.core.App#createStream(java.lang.String,
   * org.apache.s4.core.ProcessingElement[])
   */
  @Override
  public <T extends Event> Stream<T> createStream(String name, ProcessingElement... processingElements) {
    return super.createStream(name, processingElements);
  }

  // @com.beust.jcommander.Parameters(separators = "=")
  // class Parameters {
  //
  // @Parameter(names={"-lc","-local"}, description="Local clustering method")
  // private String localClustering;
  //
  // @Parameter(names={"-gc","-global"},
  // description="Global clustering method")
  // private String globalClustering;
  //
  // }
  //
  // class ParametersConverter {// implements IStringConverter<String[]> {
  //
  //
  // public String[] convertToArgs(String value) {
  //
  // String[] params = value.split(",");
  // String[] args = new String[params.length*2];
  // for(int i=0; i<params.length ; i++) {
  // args[i] = params[i].split("=")[0];
  // args[i+1] = params[i].split("=")[1];
  // i++;
  // }
  // return args;
  // }
  //
  // }

}