/*
 * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
 *
 * The MIT License
 * Copyright © 2014-2022 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.messaging;

import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;

import org.apache.kafka.clients.producer.MockProducer;
import org.apache.kafka.common.serialization.StringSerializer;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

/** Unit tests for {@link KafkaMessageProducer}. */
class KafkaMessageProducerTest {

  private MockProducer<String, String> mockProducer;
  private KafkaMessageProducer kafkaMessageProducer;

  @BeforeEach
  void setUp() {
    mockProducer = new MockProducer<>(true, new StringSerializer(), new StringSerializer());
    kafkaMessageProducer = new KafkaMessageProducer(mockProducer);
  }

  @Test
  void testProducerCanBeInstantiated() {
    assertNotNull(kafkaMessageProducer, "KafkaMessageProducer should be instantiated");
  }

  @Test
  void testPublishMessageSuccess() {
    Message message = new Message("Test Order");

    assertDoesNotThrow(() -> kafkaMessageProducer.publish("test-topic", message));
    assertEquals(1, mockProducer.history().size());
    assertEquals("test-topic", mockProducer.history().get(0).topic());
    assertEquals(message.getId(), mockProducer.history().get(0).key());
  }

  @Test
  void testPublishMessageErrorCallback() {
    MockProducer<String, String> failingProducer =
        new MockProducer<>(false, new StringSerializer(), new StringSerializer());
    KafkaMessageProducer producerWithError = new KafkaMessageProducer(failingProducer);
    Message message = new Message("Test Order");

    assertDoesNotThrow(() -> producerWithError.publish("test-topic", message));
    assertEquals(1, failingProducer.history().size());

    // Trigger error callback BEFORE closing so the exception != null branch is covered
    failingProducer.errorNext(new RuntimeException("Kafka publish error"));

    assertDoesNotThrow(() -> producerWithError.close());
    assertTrue(failingProducer.closed());
  }

  @Test
  void testClose() {
    assertDoesNotThrow(() -> kafkaMessageProducer.close());
    assertTrue(mockProducer.closed());
  }

  @Test
  void testPublishNullMessageCatchesException() {
    // Passing null causes message.getId() to throw NPE, which is caught by the
    // catch(Exception e) block — covering the "Error serializing message" log branch.
    assertDoesNotThrow(() -> kafkaMessageProducer.publish("test-topic", null));
  }
}