package edu.rice.rubis.beans;

import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.ejb.FinderException;
import javax.ejb.ObjectNotFoundException;
import javax.ejb.CreateException;
import javax.ejb.RemoveException;
import javax.ejb.EJBException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.io.Serializable;
import java.net.URLEncoder;

/**
 * This is a stateless session bean used to get the list of items
 * that belong to a specific category in a specific region. 
 * @author <a href="mailto:cecchet@rice.edu">Emmanuel Cecchet</a> and <a href="mailto:julie.marguerite@inrialpes.fr">Julie Marguerite</a>
 * @version 1.1
 */

public class SB_SearchItemsByRegionBean implements SessionBean 
{
  protected SessionContext sessionContext;
  protected Context initialContext = null;
  protected DataSource dataSource = null;


  /**
   * Get the items in a specific category.
   *
   * @return a string that is the list of items in html format
   * @since 1.1
   */
  public String getItems(Integer categoryId, Integer regionId, int page, int nbOfItems) throws RemoteException
  {
    Connection        conn = null;
    PreparedStatement stmt = null;
    ResultSet rs           = null; 
    String itemName, endDate;
    int itemId;
    float maxBid, initialPrice;
    int nbOfBids=0;
    StringBuffer html = new StringBuffer();

    // get the list of items
    try
    {
      conn = dataSource.getConnection();
      stmt = conn.prepareStatement("SELECT items.name, items.id, items.end_date, items.max_bid, items.nb_of_bids, items.initial_price FROM items,users WHERE items.category=? AND items.seller=users.id AND users.region=? AND end_date>=NOW() ORDER BY items.end_date ASC LIMIT ?,?");
      stmt.setInt(1, categoryId.intValue());
      stmt.setInt(2, regionId.intValue());
      stmt.setInt(3, page*nbOfItems);
      stmt.setInt(4, nbOfItems);
      rs = stmt.executeQuery();


    }
    catch (SQLException e)
    {
      try
      {
        if (stmt != null) stmt.close();
        if (conn != null) conn.close();
      }
      catch (Exception ignore)
      {
      }
      throw new RemoteException("Failed to get the items: " +e);
    }
    try 
    {
      while (rs.next()) 
      {
        itemName = rs.getString("name");
        itemId = rs.getInt("id");
        endDate = rs.getString("end_date");
        maxBid = rs.getFloat("max_bid");
        nbOfBids = rs.getInt("nb_of_bids");
        initialPrice = rs.getFloat("initial_price");
        if (maxBid <initialPrice)
          maxBid = initialPrice;
        html.append(printItem(itemName, itemId, maxBid, nbOfBids, endDate));
      }
      stmt.close();
      conn.close();
    } 
    catch (Exception e)
    {
      try
      {
        if (stmt != null) stmt.close();
        if (conn != null) conn.close();
      }
      catch (Exception ignore)
      {
      }
        throw new RemoteException("Cannot get items list: " +e);
    }
    return html.toString();
  }


  /**
   * Display item information as an HTML table row
   *
   * @return a <code>String</code> containing HTML code
   * @exception RemoteException if an error occurs
   * @since 1.0
   */
  public String printItem(String name, int id, float maxBid, int nbOfBids, String endDate) throws RemoteException
  {
    return "<TR><TD><a href=\""+BeanConfig.context+"/servlet/edu.rice.rubis.beans.servlets.ViewItem?itemId="+id+"\">"+name+
      "<TD>"+maxBid+
      "<TD>"+nbOfBids+
      "<TD>"+endDate+
      "<TD><a href=\""+BeanConfig.context+"/servlet/edu.rice.rubis.beans.servlets.PutBidAuth?itemId="+id+"\"><IMG SRC=\""+BeanConfig.context+"/bid_now.jpg\" height=22 width=90></a>\n";
  }
  



  // ======================== EJB related methods ============================

  /**
   * This method is empty for a stateless session bean
   */
  public void ejbCreate() throws CreateException, RemoteException
  {
  }

  /** This method is empty for a stateless session bean */
  public void ejbActivate() throws RemoteException {}
  /** This method is empty for a stateless session bean */
  public void ejbPassivate() throws RemoteException {}
  /** This method is empty for a stateless session bean */
  public void ejbRemove() throws RemoteException {}


  /** 
   * Sets the associated session context. The container calls this method 
   * after the instance creation. This method is called with no transaction context. 
   * We also retrieve the Home interfaces of all RUBiS's beans.
   *
   * @param sessionContext - A SessionContext interface for the instance. 
   * @exception RemoteException - Thrown if the instance could not perform the function 
   *            requested by the container because of a system-level error. 
   */
  public void setSessionContext(SessionContext sessionContext) throws RemoteException
  {
    this.sessionContext = sessionContext;
    if (dataSource == null)
    {
      // Finds DataSource from JNDI
 
      try
      {
        initialContext = new InitialContext(); 
        dataSource = (DataSource)initialContext.lookup("java:comp/env/jdbc/rubis");
      }
      catch (Exception e) 
      {
        throw new RemoteException("Cannot get JNDI InitialContext");
      }
    }
  }

}