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package de.uhilger.httpserver.auth.realm;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 *
 *   test=testRolle
 *   ulrich=testRolle,andereRolle  
 * 
 * @author Ulrich Hilger
 * @version 1, 03.06.2021
 */
public class SimpleRealm implements Realm {
  
  public static final String LIST_INDICATOR = "=";
  public static final String ROLE_SEPARATOR = ",";
  public static final String COMMENT_INDICATOR = "#";
  
  private String name;
  private Map<String, User> users;
  private Map<String, List> userRoles;
  
  public SimpleRealm() {
    users = new HashMap<>();
    userRoles = new HashMap<>();
  }

  public void setName(String name) {
    this.name = name;
  }
  
  public void readFromFile(File file) throws IOException {
    BufferedReader r = new BufferedReader(new FileReader(file));
    String line = r.readLine();
    while(line != null) {
      parse(line);
      line = r.readLine();
    }
    r.close();
  }
  
  private void parse(String line) {
    if(!line.startsWith(COMMENT_INDICATOR)) {
      String[] teile = line.split(LIST_INDICATOR);
      String[] rollen = teile[1].split(ROLE_SEPARATOR);
      String userId = teile[0];
      User user = new User();
      user.setName(userId);
      user.setPassword(rollen[0]);
      ArrayList rollenListe = new ArrayList(); 
      for(int i = 1; i < rollen.length; i++) {
        rollenListe.add(rollen[i]);
      }
      users.put(userId, user);
      userRoles.put(userId, rollenListe);
    }
  }
  
  /* ------------ Realm implementation -------------- */

  @Override
  public boolean isValid(String userId, String kennwort) {
    Object o = users.get(userId);
    if(o instanceof User) {
      User user = (User) o;
      return user.getPassword().equals(kennwort);
    } else {
      return false;
    }
  }

  @Override
  public boolean hasRole(String userId, String rollenId) {
    Object o = userRoles.get(userId);
    if(o instanceof List) {
      List roles = (List) o;
      return roles.contains(rollenId);
    } else {
      return false;
    }
  }

  @Override
  public String getName() {
    return name;
  }
  
}