/*
 * Copyright 2024 Google LLC
 *
 * Licensed 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 management.api;

import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import com.google.cloud.securitycentermanagement.v1.EffectiveEventThreatDetectionCustomModule;
import com.google.cloud.securitycentermanagement.v1.EventThreatDetectionCustomModule;
import com.google.cloud.securitycentermanagement.v1.EventThreatDetectionCustomModule.EnablementState;
import com.google.cloud.securitycentermanagement.v1.ValidateEventThreatDetectionCustomModuleResponse;
import com.google.cloud.testing.junit4.MultipleAttemptsRule;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.StreamSupport;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class EventThreatDetectionCustomModuleTest {
  // TODO(Developer): Replace the below variable
  private static final String PROJECT_ID = System.getenv("SCC_PROJECT_ID");
  private static final String CUSTOM_MODULE_DISPLAY_NAME =
      "java_sample_etd_custom_module_test_" + UUID.randomUUID();
  private static final int MAX_ATTEMPT_COUNT = 3;
  private static final int INITIAL_BACKOFF_MILLIS = 120000; // 2 minutes
  private static List<String> createdCustomModuleIds = new ArrayList<>();

  @Rule
  public final MultipleAttemptsRule multipleAttemptsRule =
      new MultipleAttemptsRule(MAX_ATTEMPT_COUNT, INITIAL_BACKOFF_MILLIS);

  // Check if the required environment variables are set.
  public static void requireEnvVar(String envVarName) {
    assertWithMessage(String.format("Missing environment variable '%s' ", envVarName))
        .that(System.getenv(envVarName))
        .isNotEmpty();
  }

  @BeforeClass
  public static void setUp() {
    requireEnvVar("GOOGLE_APPLICATION_CREDENTIALS");
    requireEnvVar("SCC_PROJECT_ID");
    try {
      ImmutableList<EventThreatDetectionCustomModule> response =
          ListEventThreatDetectionCustomModules
              .listEventThreatDetectionCustomModules(PROJECT_ID);
      for (EventThreatDetectionCustomModule module : response) {
        if (module.getDisplayName() != null
            && module.getDisplayName().startsWith("java_sample_etd_custom_module_test_")) {
          deleteCustomModule(PROJECT_ID, extractCustomModuleId(module.getName()));
        }
      }
    } catch (Exception e) {
      System.err.println(
          "Warning: Pre-test cleanup of custom modules failed: " + e.getMessage());
    }
  }

  @AfterClass
  // Perform cleanup of all the custom modules created by the current execution of the test, after
  // running tests
  public static void cleanUp() throws IOException {
    for (String customModuleId : createdCustomModuleIds) {
      try {
        deleteCustomModule(PROJECT_ID, customModuleId);
      } catch (Exception e) {
        System.err.println("Failed to delete module: " + customModuleId);
        e.printStackTrace();
      }
    }
  }

  // extractCustomModuleID extracts the custom module Id from the full name and below regex will
  // parses suffix after the last slash character.
  private static String extractCustomModuleId(String customModuleFullName) {
    if (!Strings.isNullOrEmpty(customModuleFullName)) {
      Pattern pattern = Pattern.compile(".*/([^/]+)$");
      Matcher matcher = pattern.matcher(customModuleFullName);
      if (matcher.find()) {
        return matcher.group(1);
      }
    }
    return "";
  }

  // deleteCustomModule method is for deleting the custom module
  private static void deleteCustomModule(String projectId, String customModuleId)
      throws IOException {
    if (!Strings.isNullOrEmpty(projectId) && !Strings.isNullOrEmpty(customModuleId)) {
      DeleteEventThreatDetectionCustomModule.deleteEventThreatDetectionCustomModule(
          projectId, customModuleId);
    }
  }

  @Test
  public void testCreateEventThreatDetectionCustomModule() throws IOException {
    EventThreatDetectionCustomModule response =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    createdCustomModuleIds.add(extractCustomModuleId(response.getName()));
    assertNotNull(response);
    assertThat(response.getDisplayName()).isEqualTo(CUSTOM_MODULE_DISPLAY_NAME);
  }

  @Test
  public void testDeleteEventThreatDetectionCustomModule() throws IOException {
    EventThreatDetectionCustomModule response =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    String customModuleId = extractCustomModuleId(response.getName());
    assertTrue(
        DeleteEventThreatDetectionCustomModule.deleteEventThreatDetectionCustomModule(
            PROJECT_ID, customModuleId));
  }

  @Test
  public void testListEventThreatDetectionCustomModules() throws IOException {
    EventThreatDetectionCustomModule createCustomModuleResponse =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    createdCustomModuleIds.add(extractCustomModuleId(createCustomModuleResponse.getName()));
    ImmutableList<EventThreatDetectionCustomModule> response =
        ListEventThreatDetectionCustomModules.listEventThreatDetectionCustomModules(PROJECT_ID);
    assertTrue(
        response.stream()
            .anyMatch(module -> CUSTOM_MODULE_DISPLAY_NAME.equals(module.getDisplayName())));
  }

  @Test
  public void testGetEventThreatDetectionCustomModule() throws IOException {
    EventThreatDetectionCustomModule response =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    String customModuleId = extractCustomModuleId(response.getName());
    createdCustomModuleIds.add(customModuleId);
    EventThreatDetectionCustomModule getCustomModuleResponse =
        GetEventThreatDetectionCustomModule.getEventThreatDetectionCustomModule(
            PROJECT_ID, customModuleId);

    assertThat(getCustomModuleResponse.getDisplayName()).isEqualTo(CUSTOM_MODULE_DISPLAY_NAME);
    assertThat(extractCustomModuleId(getCustomModuleResponse.getName())).isEqualTo(customModuleId);
  }

  @Test
  public void testUpdateEventThreatDetectionCustomModule() throws IOException {
    EventThreatDetectionCustomModule createCustomModuleResponse =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    String customModuleId = extractCustomModuleId(createCustomModuleResponse.getName());
    createdCustomModuleIds.add(customModuleId);
    EventThreatDetectionCustomModule response =
        UpdateEventThreatDetectionCustomModule.updateEventThreatDetectionCustomModule(
            PROJECT_ID, customModuleId);
    assertNotNull(response);
    assertThat(response.getEnablementState().equals(EnablementState.DISABLED));
  }

  @Test
  public void testGetEffectiveEventThreatDetectionCustomModule() throws IOException {
    EventThreatDetectionCustomModule createCustomModuleResponse =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    String customModuleId = extractCustomModuleId(createCustomModuleResponse.getName());
    createdCustomModuleIds.add(customModuleId);
    EffectiveEventThreatDetectionCustomModule getEffectiveCustomModuleResponse =
        GetEffectiveEventThreatDetectionCustomModule.getEffectiveEventThreatDetectionCustomModule(
            PROJECT_ID, customModuleId);

    assertThat(getEffectiveCustomModuleResponse.getDisplayName())
        .isEqualTo(CUSTOM_MODULE_DISPLAY_NAME);
    assertThat(extractCustomModuleId(getEffectiveCustomModuleResponse.getName()))
        .isEqualTo(customModuleId);
  }

  @Test
  public void testListEffectiveEventThreatDetectionCustomModules() throws IOException {
    EventThreatDetectionCustomModule createCustomModuleResponse =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    createdCustomModuleIds.add(extractCustomModuleId(createCustomModuleResponse.getName()));
    ImmutableList<EffectiveEventThreatDetectionCustomModule> response =
        ListEffectiveEventThreatDetectionCustomModules
            .listEffectiveEventThreatDetectionCustomModules(PROJECT_ID);
    assertTrue(
        response.stream()
            .anyMatch(module -> CUSTOM_MODULE_DISPLAY_NAME.equals(module.getDisplayName())));
  }

  @Test
  public void testListDescendantEventThreatDetectionCustomModules() throws IOException {
    EventThreatDetectionCustomModule createCustomModuleResponse =
        CreateEventThreatDetectionCustomModule.createEventThreatDetectionCustomModule(
            PROJECT_ID, CUSTOM_MODULE_DISPLAY_NAME);
    createdCustomModuleIds.add(extractCustomModuleId(createCustomModuleResponse.getName()));
    ImmutableList<EventThreatDetectionCustomModule> response =
        ListDescendantEventThreatDetectionCustomModules
            .listDescendantEventThreatDetectionCustomModules(PROJECT_ID);
    assertTrue(
        response.stream()
            .anyMatch(module -> CUSTOM_MODULE_DISPLAY_NAME.equals(module.getDisplayName())));
  }

  @Test
  public void testValidateEventThreatDetectionCustomModule() throws IOException {

    ValidateEventThreatDetectionCustomModuleResponse response =
        ValidateEventThreatDetectionCustomModule.validateEventThreatDetectionCustomModule(
            PROJECT_ID);
    assertNotNull(response);
    assertThat(response.getErrorsCount()).isEqualTo(0);
  }
}
