package org.thdl.lex.commands;

import javax.servlet.http.HttpServletRequest;

import org.thdl.lex.DisplayHelper;
import org.thdl.lex.LexComponentRepository;
import org.thdl.lex.LexConstants;
import org.thdl.lex.LexLogger;
import org.thdl.lex.LexQuery;
import org.thdl.lex.LexRepositoryException;
import org.thdl.lex.UserSessionManager;
import org.thdl.lex.Visit;
import org.thdl.lex.component.ILexComponent;
import org.thdl.lex.component.ITerm;
import org.thdl.lex.component.LexComponentException;

/**
 * Description of the Class
 * 
 * @author travis
 * @created October 3, 2003
 */
public class DisplayCommand extends LexCommand implements Command {
	//helper methods
	/**
	 * Sets the displayMode attribute of the DisplayCommand object
	 * 
	 * @param req
	 *            The new displayMode value
	 * @since
	 */
	public void setDisplayMode(HttpServletRequest req) {
		String cmd = req.getParameter(LexConstants.COMMAND_REQ_PARAM);
		if (cmd.equals("display")) {
			req.getSession(true).setAttribute(
					LexConstants.DISPLAYMODE_SESS_ATTR, "brief");
		} else if (cmd.equals("displayFull")) {
			req.getSession(true).setAttribute(
					LexConstants.DISPLAYMODE_SESS_ATTR, "full");
		} else if (cmd.equals("editEntry")) {
			req.getSession(true).setAttribute(
					LexConstants.DISPLAYMODE_SESS_ATTR, "edit");
		}
	}

	//contract methods

	/**
	 * Description of the Method
	 * 
	 * @param req
	 *            Description of Parameter
	 * @param component
	 *            Description of Parameter
	 * @return Description of the Returned Value
	 * @exception CommandException
	 *                Description of Exception
	 * @since
	 */
	public String execute(HttpServletRequest req, ILexComponent component)
			throws CommandException {
		String msg = null;
		String next = getNext();
		Visit visit = UserSessionManager.getInstance().getVisit(
				req.getSession(true));
		DisplayHelper displayHelper = visit.getHelper();
		try {
			LexQuery query = visit.getQuery();
			if (component instanceof ITerm) {
				ITerm term = (ITerm) component;

				if (null != query.getEntry()
						&& term.getMetaId()
								.equals(query.getEntry().getMetaId())) {
					LexComponentRepository.update(query.getEntry());
				} else {
					LexComponentRepository.loadTerm(term);
					query.setEntry(term);
					if (query.getResults().keySet().size() < 1) {
						query.getResults()
								.put(term.getMetaId(), term.getTerm());
					}
				}

				displayHelper.populate(req.getParameterMap());
			} else {
				next = "menu.jsp";
				msg = "The component set for display was not a term.";
				LexLogger.error(msg);
			}
			req.setAttribute(LexConstants.MESSAGE_REQ_ATTR, msg);

			return next;
		} catch (LexComponentException e) {
			throw new CommandException(e);
		} catch (LexRepositoryException e) {
			throw new CommandException(e);
		} catch (Exception e) {
			throw new CommandException(e);
		}
	}

	//constructors
	/**
	 * Constructor for the DisplayCommand object
	 * 
	 * @param next
	 *            Description of the Parameter
	 * @since
	 */
	public DisplayCommand(String next) {
		super(next);
	}
}