//Dstl (c) Crown Copyright 2017
package uk.gov.dstl.baleen.core.logging;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.doReturn;
import static org.mockito.Mockito.mock;

import java.util.Collections;
import java.util.List;

import org.junit.Test;

import uk.gov.dstl.baleen.core.logging.builders.EvictingQueueAppender;
import uk.gov.dstl.baleen.core.logging.builders.EvictingQueueBuilder;
import ch.qos.logback.classic.spi.ILoggingEvent;

/**
 * Tests for {@link EvictingQueueAppender}.
 *
 * 
 *
 */
public class EvictingQueueAppenderTest {

	@Test
	public void testBuilder() throws Exception {
		EvictingQueueBuilder builder = new EvictingQueueBuilder("test",
				Collections.emptyList(), 10);
		assertSame(builder.build(null, null), builder.getAppender());
	}

	@Test
	public void testAppend() {
		EvictingQueueAppender<ILoggingEvent> appender = new EvictingQueueAppender<ILoggingEvent>(
				10);

		for (int i = 1; i <= appender.getMaxSize(); i++) {
			String s = Integer.toString(i);
			ILoggingEvent n = createLog(s);
			appender.append(n);
			List<RecentLog> list = appender.getAll();
			assertEquals(list.get(list.size()-1).getMessage(),s );
			assertEquals(i, appender.size());
		}
		RecentLog f = appender.getAll().get(0);

		// Check that pushing one more will check f out!
		assertEquals(appender.getMaxSize(), appender.getAll().size());
		ILoggingEvent next = createLog("next");
		appender.append(next);
		assertEquals(appender.getMaxSize(), appender.getAll().size());
		assertTrue(appender.getAll().stream().filter(e -> e.getMessage().equals(next.getMessage())).toArray().length == 1);
		assertTrue(appender.getAll().stream().filter(e -> e.getMessage().equals(f.getMessage())).toArray().length == 0);
	}

	@Test
	public void testNegativeSize() {
		EvictingQueueAppender<ILoggingEvent> appender = new EvictingQueueAppender<ILoggingEvent>(
				-1);
		assertEquals(0, appender.getMaxSize());
	}

	@Test
	public void testGetMaxSize() {
		EvictingQueueAppender<ILoggingEvent> appender = new EvictingQueueAppender<ILoggingEvent>(
				100);
		assertEquals(100, appender.getMaxSize());
	}

	@Test
	public void testClear() {
		EvictingQueueAppender<ILoggingEvent> appender = new EvictingQueueAppender<ILoggingEvent>(
				10);
		appender.append(createLog("test"));
		appender.clear();
		assertTrue(appender.getAll().isEmpty());
	}

	public ILoggingEvent createLog(String msg) {
		ILoggingEvent m = mock(ILoggingEvent.class);
		doReturn(msg).when(m).getMessage();
		doReturn(msg).when(m).getFormattedMessage();
		return m;
	}
}