package de.uhilger.um.api;

import de.uhilger.baselink.GenericRecord;
import de.uhilger.baselink.Record;
import de.uhilger.um.App;
import de.uhilger.um.daten.User;
import de.uhilger.um.daten.UserRole;
import java.util.List;
import org.apache.catalina.realm.RealmBase;

/**
 * Klasse zur Verwaltung von Benutzern und Rollen 
 * in einer Datenbank
 * 
 * @author Ulrich Hilger
 */
public class UserMgr {
  
  private static final String MD5 = "MD5";
  
  private static final Record UserMapper = new GenericRecord(User.class);
  private static final Record UserRoleMapper = new GenericRecord(UserRole.class);
  
  public static final String SQL_GET_USER_LIST = "getUserList";
  public static final String SQL_GET_USER_NAME_LIST = "getUserNameList";
  public static final String SQL_GET_ROLE_LIST = "getRoleList";
  public static final String SQL_DELETE_USER = "deleteUser";
  
  /* ----------- Benutzer -------------- */
  
  public User createUser(User user) {
    String kw = user.getPw();
    String digestedPw = RealmBase.Digest(kw, MD5, null);
    user.setPw(digestedPw);
    App.getDatabase().insert(user, UserMapper);
    return user;
  }
  
  public List getUserNameList() {
    String sql = App.getSqlStatement(SQL_GET_USER_NAME_LIST);
    List userNames = App.getDatabase().select(sql, App.WITHOUT_BLOBS);
    return userNames;
  }
  
  public User deleteUser(User user) {
    return (User) App.getDatabase().delete(user, UserMapper);
  }
  
  /*
  public List getUserList() {
    String sql = App.getSqlStatement(SQL_GET_USER_LIST);
    List users = App.getDatabase().select(sql, UserMapper, App.WITHOUT_BLOBS);
    return users;
  }
  */
  
  /* ------------ Rollen ------------------ */
  
  public UserRole grantRole(String userId, String roleName) {
    UserRole ur = new UserRole();
    ur.setRole(roleName);
    ur.setUser(userId);
    App.getDatabase().insert(ur, UserRoleMapper);
    return ur;
  }
  
  public UserRole revokeRole(String userId, String roleName) {
    UserRole ur = new UserRole();
    ur.setRole(roleName);
    ur.setUser(userId);
    App.getDatabase().delete(ur, UserRoleMapper);
    return ur;
  }
  
  public List getRoleNamesGranted() {
    String sql = App.getSqlStatement(SQL_GET_ROLE_LIST);
    List roleNames = App.getDatabase().select(sql, App.WITHOUT_BLOBS);
    return roleNames;
  }
  
  /* ------------ sonstige Methoden -------------- */
  
  public String hallo() {
    return "Hallo Welt";
  }
  
}