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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.apache.streampipes.rest.impl;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.subject.Subject;
import org.apache.streampipes.config.backend.BackendConfig;
import org.apache.streampipes.manager.storage.UserManagementService;
import org.apache.streampipes.model.client.messages.ErrorMessage;
import org.apache.streampipes.model.client.messages.NotificationType;
import org.apache.streampipes.model.client.messages.Notifications;
import org.apache.streampipes.model.client.messages.SuccessMessage;
import org.apache.streampipes.model.client.user.RegistrationData;
import org.apache.streampipes.model.client.user.Role;
import org.apache.streampipes.model.client.user.ShiroAuthenticationRequest;
import org.apache.streampipes.model.client.user.ShiroAuthenticationResponse;
import org.apache.streampipes.model.client.user.ShiroAuthenticationResponseFactory;
import org.apache.streampipes.rest.api.IAuthentication;
import org.apache.streampipes.rest.shared.annotation.GsonWithIds;

import java.util.HashSet;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

@Path("/v2/admin")
public class Authentication extends AbstractRestInterface implements IAuthentication {

  @Produces(MediaType.APPLICATION_JSON)
  @Consumes(MediaType.APPLICATION_JSON)
  @GsonWithIds
  @POST
  @Override
  @Path("/login")
  public Response doLogin(ShiroAuthenticationRequest token) {
    try {
      ShiroAuthenticationResponse authResponse = login(token);
      return ok(authResponse);
    } catch (AuthenticationException e) {
      return ok(new ErrorMessage(NotificationType.LOGIN_FAILED.uiNotification()));
    }
  }


  @Path("/logout")
  @GET
  @GsonWithIds
  @Override
  public Response doLogout() {
    Subject subject = SecurityUtils.getSubject();
    subject.logout();
    return ok(new SuccessMessage(NotificationType.LOGOUT_SUCCESS.uiNotification()));
  }


  @Path("/register")
  @POST
  @GsonWithIds
  @Produces(MediaType.APPLICATION_JSON)
  @Consumes(MediaType.APPLICATION_JSON)
  @Override
  public Response doRegister(RegistrationData data) {

    Set roles = new HashSet<>();
    roles.add(data.getRole());
    if (getUserStorage().emailExists(data.getEmail())) {
      return ok(Notifications.error("This email address already exists. Please choose another address."));
    } else {
      new UserManagementService().registerUser(data, roles);
      return ok(new SuccessMessage(NotificationType.REGISTRATION_SUCCESS.uiNotification()));
    }
  }

  @GET
  @GsonWithIds
  @Path("/authc")
  @Override
  public Response userAuthenticated(@Context HttpServletRequest req) {

    if (BackendConfig.INSTANCE.isConfigured()) {
      if (SecurityUtils.getSubject().isAuthenticated()) {
        ShiroAuthenticationResponse response = ShiroAuthenticationResponseFactory
                .create(getUserStorage()
                        .getUser((String) SecurityUtils.getSubject().getPrincipal()));
        return ok(response);
      }
    }
    return ok(new ErrorMessage(NotificationType.NOT_LOGGED_IN.uiNotification()));
  }


  private ShiroAuthenticationResponse login(ShiroAuthenticationRequest token) {
    Subject subject = SecurityUtils.getSubject();
    UsernamePasswordToken shiroToken = new UsernamePasswordToken(token.getUsername(),
            token.getPassword());
    shiroToken.setRememberMe(true);

    subject.login(shiroToken);
    ShiroAuthenticationResponse response = ShiroAuthenticationResponseFactory
            .create(getUserStorage().getUser((String) subject.getPrincipal()));
    response.setToken(subject.getSession().getId().toString());

    return response;

  }

}