package ch.ffhs.webE.action;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.StrutsStatics;

import ch.ffhs.webE.dao.HistoryDAO;
import ch.ffhs.webE.dao.RelationshipDAO;
import ch.ffhs.webE.dao.RelationshipTypeDAO;
import ch.ffhs.webE.dao.TermDAO;
import ch.ffhs.webE.dao.UserDAO;
import ch.ffhs.webE.domain.ActionType;
import ch.ffhs.webE.domain.History;
import ch.ffhs.webE.domain.ObjectEntity;
import ch.ffhs.webE.domain.ObjectType;
import ch.ffhs.webE.domain.Relationship;
import ch.ffhs.webE.domain.RelationshipType;
import ch.ffhs.webE.domain.Term;
import ch.ffhs.webE.domain.User;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

/**
 * Implements actions applicable to relationship editing
 * 
 * @author Thomas Lahn
 */
public class RelationshipAction extends ActionSupport implements
    ModelDriven<Relationship>
{
  private static final long serialVersionUID = 1L;

  private List<RelationshipType> relationshipTypes = new ArrayList<RelationshipType>();
  private final RelationshipTypeDAO relationshipTypeDAO = new RelationshipTypeDAO();

  private List<Term> terms = new ArrayList<Term>();
  private final TermDAO termDAO = new TermDAO();

  private List<Relationship> relationshipList = new ArrayList<Relationship>();
  private Relationship relationship = new Relationship();

  /**
   * The term that was just saved (added, renamed)
   */
  private Relationship modifiedRelationship;

  private final RelationshipDAO relationshipDAO = new RelationshipDAO();

  private final UserDAO userDAO = new UserDAO();

  private Set<History> history;
  private final HistoryDAO historyDAO = new HistoryDAO();

  /**
   * Session object
   */
  Map<String, Object> session = ActionContext.getContext().getSession();

  /**
   * @var <code>true</code> if the relationship is to be edited/renamed,
   *      <code>false</code> otherwise
   */
  public boolean edit = false;

  /**
   * @var <code>true</code> if a relationship was added, <code>false</code>
   *      otherwise
   */
  public boolean added = false;

  private final HttpServletRequest request = (HttpServletRequest) ActionContext
      .getContext().get(StrutsStatics.HTTP_REQUEST);

  /*
   * (non-Javadoc)
   * 
   * @see com.opensymphony.xwork2.ModelDriven#getModel()
   */
  public Relationship getModel()
  {
    return this.relationship;
  }

  /**
   * DB query for relationship list
   * 
   * @return SUCCESS
   */
  public String list()
  {
    this.setTerms(this.termDAO.getList());
    this.setRelationshipTypes(this.relationshipTypeDAO.getList());
    this.setRelationshipList(this.relationshipDAO.getList());
    return Action.SUCCESS;
  }

  /**
   * Executes the DB query to save the relationship
   * 
   * @return {@link Action#SUCCESS}
   */
  public String save()
  {
    this.relationship.setTermFrom(this.termDAO.getById(Integer
        .parseInt(this.request.getParameter("term1"))));
    this.relationship.setTermTo(this.termDAO.getById(Integer
        .parseInt(this.request.getParameter("term2"))));
    this.relationship.setRelationshipType(this.relationshipTypeDAO
        .getById(Integer.parseInt(this.request.getParameter("type"))));

    User user = this.userDAO.getByUsername((String) this.session
        .get("username"));
    Date now = new Date();
    ObjectEntity obj;
    int action = 0;

    if ("false".equals(this.request.getParameter("edit")))
    {
      /* Add a new relationship */
      obj = new ObjectEntity(user, new ObjectType(ObjectType.RELATIONSHIP),
          user, null, new Date(), false, null, null, this.relationship);
      this.relationship.setObject(obj);
      this.added = true;
      action = ActionType.ADD;
    }
    else
    {
      obj = new ObjectEntity();
      obj.setId(this.relationship.getObjectId());
      action = ActionType.MODIFY;
    }

    this.edit = false;

    String result = Action.SUCCESS;
    if (this.relationshipDAO.saveOrUpdate(this.relationship))
    {
      String comment = this.request.getParameter("comment");

      History historyRecord = new History(user, new ActionType(action), obj,
          "(" + this.relationship.getTermFrom().getName() + ") ("
              + this.relationship.getRelationshipType().getNameFrom() + ") ("
              + this.relationship.getTermTo().getName() + ")", comment, now);

      this.historyDAO.saveOrUpdate(historyRecord);
    }
    else
    {
      result = Action.ERROR;
    }

    this.setModifiedRelationship(this.relationship);
    this.setRelationship(null);

    this.list();

    return result;
  }

  /**
   * @return {@link Action#SUCCESS} if <var>id</var> > 0, {@link Action#ERROR}
   *         otherwise
   */
  public String edit()
  {
    int id = this.getIdParameter();

    String result = Action.ERROR;
    if (id > 0)
    {
      this.setRelationship(this.relationshipDAO.getById(id));
      if (this.getRelationship() != null)
      {
        this.edit = true;
        result = Action.SUCCESS;
      }
    }

    this.list();

    return result;
  }

  /**
   * deletes a user, gets the ID from the "id" parameter that was submitted with
   * the HTTP request
   * 
   * @return String - either SUCCESS or ERROR constant
   */
  public String delete()
  {
    int id = this.getIdParameter();

    /* Check for malicious ID values */
    String result = Action.SUCCESS;
    if (id > 0)
    {
      this.relationshipDAO.delete(id);
    }
    else
    {
      result = Action.ERROR;
    }

    this.list();

    return result;
  }

  /**
   * Gets the ID Parameter for update / delete requests
   * 
   * @return int from the ID request. If not set or wrong, it gives back -1
   */
  private int getIdParameter()
  {
    int id = -1;
    try
    {
      id = Integer.parseInt(this.request.getParameter("id")); //$NON-NLS-1$
    }
    catch (Exception e)
    {
      /* TODO: Logging - wrong parameter set */
    }

    return id;
  }

  /* Standard getters and setters */

  /**
   * @return The relationship edited with this instance
   */
  public Relationship getRelationship()
  {
    return this.relationship;
  }

  /**
   * @param relationship
   *          The relationship edited with this instance
   */
  public void setRelationship(Relationship relationship)
  {
    this.relationship = relationship;
  }

  /**
   * @return The list of terms edited with this instance
   */
  public List<Relationship> getRelationshipList()
  {
    return this.relationshipList;
  }

  /**
   * @param relationshipList
   *          The list of terms edited with this instance
   */
  public void setRelationshipList(List<Relationship> relationshipList)
  {
    this.relationshipList = relationshipList;
  }

  /**
   * @return the relationshipTypes
   */
  public List<RelationshipType> getRelationshipTypes()
  {
    return this.relationshipTypes;
  }

  /**
   * @param relationshipTypes
   *          the relationshipTypes to set
   */
  public void setRelationshipTypes(List<RelationshipType> relationshipTypes)
  {
    this.relationshipTypes = relationshipTypes;
  }

  /**
   * @return the terms
   */
  public List<Term> getTerms()
  {
    return this.terms;
  }

  /**
   * @param terms
   *          the terms to set
   */
  public void setTerms(List<Term> terms)
  {
    this.terms = terms;
  }

  /**
   * @return the modifiedRelationship
   */
  public Relationship getModifiedRelationship()
  {
    return this.modifiedRelationship;
  }

  /**
   * @param modifiedRelationship
   *          the modifiedRelationship to set
   */
  public void setModifiedRelationship(Relationship modifiedRelationship)
  {
    this.modifiedRelationship = modifiedRelationship;
  }

  /**
   * @return the history
   */
  public Set<History> getHistory()
  {
    return this.history;
  }

  /**
   * @param history
   *          the history to set
   */
  public void setHistory(Set<History> history)
  {
    this.history = history;
  }
}