import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TemplateService {

	/**
	 * R. Al-Rawi, CARET, Cambridge UK.
	 * 16-Mar-2007
	 */
	public static void main(String[] args) {
		String emailTemplate = "Welcome to {systemServiceName}\n\nYou have been registered as a member of the {siteTitle} worksite on {systemServiceName} by {registrarName}.\nYou need to complete the registration process by following the link:\n\n{guestRegUrl}\n\nand providing the required details.\n\nOnce registration is complete you can log into {systemServiceName} by going to:\n\n{systemUrl}\n\nand using the user ID: {userEid} and the password you entered when completing registration.\nYou can maintain your account (user details and password) at:\n\n{guestAccountUrl}\n\nYou may find it useful to add the site to your browser favourites.\nIf you have any problems or questions, email {systemServiceName} support: {supportEmail}\n\nRegards\n\nSystem Administrator\n{systemServiceName}";
		String emailSubjectTemplate = "You are a member of {siteTitle} on {systemServiceName}";
		
		String fromAddress = "admin@sakaiproject.org";
		String userEmail = "user@sakaiproject.org";
		String userEid = "u123";
		String userPassword = "zMd9saqW";
		String registrarName = "Site Maintainer";
		String registrarEmail = "maintainer@sakaiproject.org";
		String siteTitle = "Test Worksite";
		String systemServiceName = "Sakai";
		String systemInstitution = "The Sakai Foundation";
		String systemUrl = "www.sakaiproject.org";
		String guestAccountUrl = "www.sakaiproject.org/guestaccounts";
		String guestRegUrl = "www.sakaiproject.org/guestaccounts/registration";
		String userAccountUrl = "www.sakaiproject.org/myaccount";
		String supportEmail = "helpdesk@sakaiproject.org";
		
		// Template parameters		
		Map templateArgsMap = new HashMap();
		
		templateArgsMap.put("fromAddress", fromAddress);						// from email
		templateArgsMap.put("userEmail", userEmail);							// user's email
		templateArgsMap.put("userEid", userEid);								// user's EID
		templateArgsMap.put("userPassword", userPassword);						// new random generated password
		templateArgsMap.put("registrarName", registrarName);					// registering user's display name
		templateArgsMap.put("registrarEmail", registrarEmail);					// registering user's email
		templateArgsMap.put("siteTitle", siteTitle);							// title of site added to
		templateArgsMap.put("systemServiceName", systemServiceName);			// system name
		templateArgsMap.put("systemInstitution", systemInstitution);			// institution name
		templateArgsMap.put("systemUrl", systemUrl);							// system url
		templateArgsMap.put("guestAccountUrl", guestAccountUrl);				// guest account maintenance url
		templateArgsMap.put("guestRegUrl", guestRegUrl);						// url to complete new user reg
		templateArgsMap.put("userAccountUrl", userAccountUrl);					// account maintenance url
		templateArgsMap.put("supportEmail", supportEmail);						// system support email address
		
		String message_subject = templateProcess(emailSubjectTemplate, templateArgsMap);
		String message_content = templateProcess(emailTemplate, templateArgsMap);
		
		System.out.println(message_subject);
		System.out.println(message_content);		
	}

	public static String templateProcess(String template, Map templateArgs)
	{
		Pattern p = Pattern.compile("\\{([^\\}]*)\\}");
		Matcher m = p.matcher(template);
		StringBuffer sb = new StringBuffer();
		
		while (m.find())
		{
			if (templateArgs.get(m.group(1)) != null) {
				m.appendReplacement(sb, templateArgs.get(m.group(1)).toString());	
			}	
		}
		
		m.appendTail(sb);		
		return sb.toString();	
	}
}