package com.relationinfo.webapp.action;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.relationinfo.model.User;
import com.relationinfo.service.MailEngine;
import com.relationinfo.service.UserManager;
import com.relationinfo.webapp.util.RequestUtil;

import org.springframework.context.MessageSource;
import org.springframework.context.support.MessageSourceAccessor;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.view.RedirectView;

/**
 * Simple class to retrieve and send a password hint to users.
 *
 * <p>
 * <a href="PasswordHintController.java.html"><i>www.relationinfo.com</i></a>
 * </p>
 *
 * @author caoguangxin www.relationinfo.com
 */
public class PasswordHintController implements Controller {
    private transient final Log log = LogFactory.getLog(PasswordHintController.class);
    private UserManager mgr = null;
    private MessageSource messageSource = null;
    protected MailEngine mailEngine = null;
    protected SimpleMailMessage message = null;
    
    public void setUserManager(UserManager userManager) {
        this.mgr = userManager;
    }

    public void setMessageSource(MessageSource messageSource) {
        this.messageSource = messageSource;
    }

    public void setMailEngine(MailEngine mailEngine) {
        this.mailEngine = mailEngine;
    }
    
    public void setMessage(SimpleMailMessage message) {
        this.message = message;
    }
    
    public ModelAndView handleRequest(HttpServletRequest request,
                                      HttpServletResponse response)
    throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("entering 'handleRequest' method...");
        }

        String username = request.getParameter("username");
        MessageSourceAccessor text = 
            new MessageSourceAccessor(messageSource, request.getLocale());

        // ensure that the username has been sent
        if (username == null) {
            log.warn("Username not specified, notifying user that it's a required field.");

            request.setAttribute("error",
                                 text.getMessage("errors.required",
                                                 new Object[] {
                                                     text.getMessage("user.username")
                                                 }));

            return new ModelAndView("login");
        }

        if (log.isDebugEnabled()) {
            log.debug("Processing Password Hint...");
        }

        // look up the user's information
        try {
            User user = (User) mgr.getUser(username);

            StringBuffer msg = new StringBuffer();
            msg.append("Your password hint is: " + user.getPasswordHint());
            msg.append("\n\nLogin at: " + RequestUtil.getAppURL(request));

            message.setTo(user.getEmail());
            String subject = text.getMessage("webapp.prefix") + 
                             text.getMessage("user.passwordHint");
            message.setSubject(subject);
            message.setText(msg.toString());
            mailEngine.send(message);

            saveMessage(request,
                        text.getMessage("login.passwordHint.sent",
                                        new Object[] { username, user.getEmail() }));
        } catch (Exception e) {
            saveError(request,
                      text.getMessage("login.passwordHint.error",
                                      new Object[] { username }));
        }

        return new ModelAndView(new RedirectView(request.getContextPath()));
    }

    public void saveError(HttpServletRequest request, String error) {
        List errors = (List) request.getSession().getAttribute("errors");
        if (errors == null) {
            errors = new ArrayList();
        }
        errors.add(error);
        request.getSession().setAttribute("errors", errors);
    }

    // this method is also in BaseForm Controller
    public void saveMessage(HttpServletRequest request, String msg) {
        List messages = (List) request.getSession().getAttribute("messages");
        if (messages == null) {
            messages = new ArrayList();
        }
        messages.add(msg);
        request.getSession().setAttribute("messages", messages);
    }
}