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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.application;

import java.time.Instant;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;

import com.yahoo.config.provision.ApplicationId;
import com.yahoo.component.Version;
import com.yahoo.vespa.config.server.ModelStub;
import com.yahoo.vespa.config.server.monitoring.MetricUpdater;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.assertEquals;

/**
 * @author Vegard Sjonfjell
 */
public class ApplicationVersionsTest {

    private ApplicationVersions applicationVersions;
    private final List<Version> vespaVersions = new ArrayList<>();
    private final List<Application> applications = new ArrayList<>();

    @Before
    public void setUp() {
        vespaVersions.addAll(List.of(Version.fromString("1.2.3"), Version.fromString("1.2.4"), Version.fromString("1.2.5")));
        applications.addAll(List.of(createApplication(vespaVersions.get(0)), createApplication(vespaVersions.get(1)), createApplication(vespaVersions.get(2))));
    }

    @Test
    public void testGetForVersionOrLatestReturnsCorrectVersion() {
        applicationVersions = ApplicationVersions.fromList(applications);
        assertEquals(applicationVersions.getForVersionOrLatest(Optional.of(vespaVersions.get(0)), Instant.now()), applications.get(0));
        assertEquals(applicationVersions.getForVersionOrLatest(Optional.of(vespaVersions.get(1)), Instant.now()), applications.get(1));
        assertEquals(applicationVersions.getForVersionOrLatest(Optional.of(vespaVersions.get(2)), Instant.now()), applications.get(2));
    }

    @Test
    public void testGetForVersionOrLatestReturnsLatestVersion() {
        applicationVersions = ApplicationVersions.fromList(applications);
        assertEquals(applicationVersions.getForVersionOrLatest(Optional.empty(), Instant.now()), applications.get(2));
    }

    @Test (expected = VersionDoesNotExistException.class)
    public void testGetForVersionOrLatestThrows() {
        applicationVersions = ApplicationVersions.fromList(Arrays.asList(applications.get(0), applications.get(2)));
        applicationVersions.getForVersionOrLatest(Optional.of(vespaVersions.get(1)), Instant.now());
    }

    @Test
    public void testGetAllVersions() {
        applicationVersions = ApplicationVersions.fromList(applications);
        assertEquals(List.of(Version.fromString("1.2.3"), Version.fromString("1.2.4"), Version.fromString("1.2.5")),
                     applicationVersions.versions(ApplicationId.defaultId()));
    }

    private Application createApplication(Version version) {
        return new Application(new ModelStub(), null, 0, version, MetricUpdater.createTestUpdater(), ApplicationId.defaultId());
    }
}