/*
 * Copyright 2025 Apollo Authors
 *
 * 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 com.ctrip.framework.apollo.biz.registry;

import static com.ctrip.framework.apollo.biz.registry.ServiceInstanceFactory.newServiceInstance;
import static org.junit.jupiter.api.Assertions.*;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;

class DatabaseDiscoveryClientAlwaysAddSelfInstanceDecoratorImplTest {

  @Test
  void getInstances_other_service_name() {
    final String otherServiceName = "other-service";
    DatabaseDiscoveryClient client = Mockito.mock(DatabaseDiscoveryClient.class);
    Mockito.when(client.getInstances(otherServiceName)).thenReturn(Collections.singletonList(
        newServiceInstance(otherServiceName, "http://10.240.34.56:8081/", "beijing")));

    final String selfServiceName = "self-service";
    ServiceInstance selfInstance =
        newServiceInstance(selfServiceName, "http://10.240.34.56:8081/", "beijing");

    DatabaseDiscoveryClient decorator =
        new DatabaseDiscoveryClientAlwaysAddSelfInstanceDecoratorImpl(client, selfInstance);

    List<ServiceInstance> serviceInstances = decorator.getInstances(otherServiceName);
    assertEquals(1, serviceInstances.size());
    ServiceInstance otherServiceNameInstance = serviceInstances.get(0);
    assertEquals(otherServiceName, otherServiceNameInstance.getServiceName());

    Mockito.verify(client, Mockito.times(1)).getInstances(Mockito.eq(otherServiceName));

    Mockito.verify(client, Mockito.never()).getInstances(Mockito.eq(selfServiceName));
  }

  @Test
  void getInstances_contain_self() {
    final String otherServiceName = "other-service";
    DatabaseDiscoveryClient client = Mockito.mock(DatabaseDiscoveryClient.class);
    Mockito.when(client.getInstances(otherServiceName)).thenReturn(Collections.singletonList(
        newServiceInstance(otherServiceName, "http://10.240.34.56:8081/", "beijing")));

    final String selfServiceName = "self-service";
    ServiceInstance selfInstance =
        newServiceInstance(selfServiceName, "http://10.240.34.56:8081/", "beijing");
    Mockito.when(client.getInstances(selfServiceName)).thenReturn(Arrays.asList(selfInstance,
        // same service name but different service instance
        newServiceInstance(selfServiceName, "http://10.240.34.56:8082/", "beijing"),
        newServiceInstance(selfServiceName, "http://10.240.34.56:8083/", "beijing")));

    DatabaseDiscoveryClient decorator =
        new DatabaseDiscoveryClientAlwaysAddSelfInstanceDecoratorImpl(client, selfInstance);

    List<ServiceInstance> serviceInstances = decorator.getInstances(selfServiceName);
    assertEquals(3, serviceInstances.size());

    Mockito.verify(client, Mockito.times(1)).getInstances(Mockito.eq(selfServiceName));

    Mockito.verify(client, Mockito.never()).getInstances(Mockito.eq(otherServiceName));
  }

  /**
   * will add self
   */
  @Test
  void getInstances_same_service_name_without_self() {
    final String otherServiceName = "other-service";
    DatabaseDiscoveryClient client = Mockito.mock(DatabaseDiscoveryClient.class);
    Mockito.when(client.getInstances(otherServiceName)).thenReturn(Collections.singletonList(
        newServiceInstance(otherServiceName, "http://10.240.34.56:8081/", "beijing")));

    final String selfServiceName = "self-service";
    ServiceInstance selfInstance =
        newServiceInstance(selfServiceName, "http://10.240.34.56:8081/", "beijing");
    Mockito.when(client.getInstances(selfServiceName)).thenReturn(Arrays.asList(
        // same service name but different service instance
        newServiceInstance(selfServiceName, "http://10.240.34.56:8082/", "beijing"),
        newServiceInstance(selfServiceName, "http://10.240.34.56:8083/", "beijing")));

    DatabaseDiscoveryClient decorator =
        new DatabaseDiscoveryClientAlwaysAddSelfInstanceDecoratorImpl(client, selfInstance);

    List<ServiceInstance> serviceInstances = decorator.getInstances(selfServiceName);
    // because mocked data don't contain self instance
    // after add self instance, there are 3 instances now
    assertEquals(3, serviceInstances.size());

    Mockito.verify(client, Mockito.times(1)).getInstances(Mockito.eq(selfServiceName));

    Mockito.verify(client, Mockito.never()).getInstances(Mockito.eq(otherServiceName));
  }
}
