package com.atlassian.refapp.auth.internal;
   
   import com.atlassian.user.EntityException;
   import com.atlassian.user.Group;
   import com.atlassian.user.GroupManager;
   import com.atlassian.user.User;
   import com.atlassian.user.UserManager;
   import org.apache.commons.logging.Log;
   import org.apache.commons.logging.LogFactory;
  
  public class AuthenticationInitialization {
      private final Log log = LogFactory.getLog(getClass());
  
      public AuthenticationInitialization(UserManager userManager, GroupManager groupManager) {
          try {
              addUser(userManager, groupManager, "admin", "A. D. Ministrator (Sysadmin)", "admin@example.com", "admin", "users", "system_administrators");
              addUser(userManager, groupManager, "fred", "Fred Sysadmin", "fred@example.org", "fred", "users", "system_administrators");
              addUser(userManager, groupManager, "barney", "Barney User", "barney@example.org", "barney", "users");
              addUser(userManager, groupManager, "betty", "Betty Admin", "betty@example.org", "betty", "users", "administrators");
          } catch (EntityException e) {
              log.error("Failed setting up default users", e);
          }
      }
  
      private void addUser(UserManager userManager, GroupManager groupManager,
                           String username, String fullName, String email, String password, String... groupNames) throws EntityException {
          User user = userManager.createUser(username);
          user.setFullName(fullName);
          user.setEmail(email);
          userManager.saveUser(user);
          userManager.alterPassword(user, password);
          for (String groupName : groupNames) {
              Group group = getOrCreateGroupIfAbsent(groupManager, groupName);
              groupManager.addMembership(group, user);
          }
      }
  
      private Group getOrCreateGroupIfAbsent(GroupManager groupManager, String groupName) throws EntityException {
          Group group = groupManager.getGroup(groupName);
          if (group == null) {
              group = groupManager.createGroup(groupName);
          }
          return group;
      }
  }