/**
 * Copyright 2016 Tampere University of Technology, Pori Department
 * 
 * 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.
 */
package service.tut.pori.apilta.sensors.datatypes;

import java.util.List;
import java.util.Set;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElementRef;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

import org.apache.log4j.Logger;
import org.quartz.JobBuilder;

import service.tut.pori.apilta.sensors.SensorTaskDAO;
import service.tut.pori.tasks.BackendTaskJob;
import service.tut.pori.tasks.datatypes.Task;
import service.tut.pori.tasks.datatypes.TaskBackend;
import core.tut.pori.context.ServiceInitializer;

/**
 * Represents a single sensor task
 * 
 */
@XmlRootElement(name=service.tut.pori.tasks.Definitions.ELEMENT_TASK)
@XmlAccessorType(XmlAccessType.NONE)
public class SensorTask extends Task{
  private static final Logger LOGGER = Logger.getLogger(SensorTask.class);
  @XmlElementWrapper(name = Definitions.ELEMENT_WHEN)
  @XmlElementRef(type = Condition.class)
  private List<Condition> _conditions = null;
  @XmlElementWrapper(name = Definitions.ELEMENT_WHAT)
  @XmlElementRef(type = Output.class)
  private List<Output> _output = null;
  /** Optional element for containing the task results */
  @XmlElementRef(type = MeasurementList.class)
  private MeasurementList _data = null;

  @Override
  public String getCallbackUri() {
    return ServiceInitializer.getPropertyHandler().getRESTBindContext()+service.tut.pori.apilta.sensors.Definitions.SERVICE_SENSORS+"/"+service.tut.pori.tasks.Definitions.METHOD_TASK_FINISHED;
  }

  @Override
  public SensorTaskDAO getTaskDao() {
    return ServiceInitializer.getDAOHandler().getDAO(SensorTaskDAO.class);
  }

  /**
   * 
   * @return list of {@link Condition}s
   */
  public List<Condition> getConditions() {
    return _conditions;
  }

  /**
   * 
   * @param conditions
   */
  public void setConditions(List<Condition> conditions) {
    _conditions = conditions;
  }

  /**
   * @return the output
   */
  public List<Output> getOutput() {
    return _output;
  }

  /**
   * @param output the output to set
   */
  public void setOutput(List<Output> output) {
    _output = output;
  }

  /**
   * @return the data
   */
  public MeasurementList getMeasurements() {
    return _data;
  }

  /**
   * @param data the data to set
   */
  public void setMeasurements(MeasurementList data) {
    _data = data;
  }
  
  /**
   * 
   */
  public SensorTask() {
    super();
  }
  
  /**
   * Create new sensor task based on the details of the base class task
   * 
   * @param task
   */
  public SensorTask(Task task) {
    super(task);
  }

  /**
   * @return true if the task is valid, a valid task must have valid output+condition lists OR a valid measurement list (NOT both)
   */
  @Override
  protected boolean isValid() {
    if(!super.isValid()){
      LOGGER.debug("Invalid base task.");
      return false;
    }else if(MeasurementList.isValid(_data)){
      if(_conditions != null || _output != null){
        LOGGER.debug("Giving measurement list in combination with output or condition list is not allowed.");
        return false;
      }
      
      List<TaskBackend> backends = getBackends();
      for(Measurement measurement : _data.getMeasurements()){ // check that the measurements do not contain back end identifiers that are not present in the task back end list
        Long backendId = measurement.getBackendId();
        boolean found = false;
        for(TaskBackend backend : backends){
          if(backend.getBackendId().equals(backendId)){
            found = true;
            break;
          }
        } // for back end
        if(!found){
          LOGGER.debug("Back end, id: "+backendId+" is not present in the task back end list.");
          return false;
        }
      } // for measurement
    }else{
      if(_conditions == null || _output == null || _conditions.isEmpty() || _output.isEmpty()){
        LOGGER.debug("No conditions, output and back ends.");
        return false;
      }
      
      for(Condition condition : _conditions){
        if(!Condition.isValid(condition)){
          LOGGER.debug("Invalid condition.");
          return false;
        }
      }
      
      for(Output o : _output) {
        if(!Output.isValid(o)){
          LOGGER.debug("Invalid output.");
          return false;
        }
      }
    }
    
    return true;
  }

  @Override
  public JobBuilder getBuilder() {
    Set<String> taskTypes = getTaskTypes();
    if(taskTypes == null){
      LOGGER.warn("No task types defined, returning builder for "+BackendTaskJob.class.toString());
      return BackendTaskJob.getBuilder(this);
    }else if(taskTypes.contains(service.tut.pori.tasks.Definitions.TASK_TYPE_VIRTUAL)){
      LOGGER.debug("Virtual task, returning builder for "+VirtualSensorTaskJob.class.toString());
      return VirtualSensorTaskJob.getBuilder(this);
    }else{
      LOGGER.debug("Not a virtual task, returning builder for "+BackendTaskJob.class.toString());
      return BackendTaskJob.getBuilder(this);
    }
  }
}