package org.eclipse.aether.internal.impl;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import static org.junit.Assert.*;

import java.io.File;
import java.net.URI;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.impl.UpdateCheck;
import org.eclipse.aether.internal.impl.DefaultUpdateCheckManager;
import org.eclipse.aether.internal.test.util.TestFileUtils;
import org.eclipse.aether.internal.test.util.TestUtils;
import org.eclipse.aether.metadata.DefaultMetadata;
import org.eclipse.aether.metadata.Metadata;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.repository.RepositoryPolicy;
import org.eclipse.aether.transfer.ArtifactNotFoundException;
import org.eclipse.aether.transfer.ArtifactTransferException;
import org.eclipse.aether.transfer.MetadataNotFoundException;
import org.eclipse.aether.transfer.MetadataTransferException;
import org.eclipse.aether.util.repository.SimpleResolutionErrorPolicy;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 */
public class DefaultUpdateCheckManagerTest
{

    private static final long HOUR = 60L * 60L * 1000L;

    private DefaultUpdateCheckManager manager;

    private DefaultRepositorySystemSession session;

    private Metadata metadata;

    private RemoteRepository repository;

    private Artifact artifact;

    @Before
    public void setup()
        throws Exception
    {
        File dir = TestFileUtils.createTempFile( "" );
        TestFileUtils.deleteFile( dir );

        File metadataFile = new File( dir, "metadata.txt" );
        TestFileUtils.writeString( metadataFile, "metadata" );
        File artifactFile = new File( dir, "artifact.txt" );
        TestFileUtils.writeString( artifactFile, "artifact" );

        session = TestUtils.newSession();
        repository =
            new RemoteRepository.Builder( "id", "default", TestFileUtils.createTempDir().toURI().toURL().toString() ).build();
        manager = new DefaultUpdateCheckManager().setUpdatePolicyAnalyzer( new DefaultUpdatePolicyAnalyzer() );
        metadata =
            new DefaultMetadata( "gid", "aid", "ver", "maven-metadata.xml", Metadata.Nature.RELEASE_OR_SNAPSHOT,
                                 metadataFile );
        artifact = new DefaultArtifact( "gid", "aid", "", "ext", "ver" ).setFile( artifactFile );
    }

    @After
    public void teardown()
        throws Exception
    {
        new File( metadata.getFile().getParent(), "resolver-status.properties" ).delete();
        new File( artifact.getFile().getPath() + ".lastUpdated" ).delete();
        metadata.getFile().delete();
        artifact.getFile().delete();
        TestFileUtils.deleteFile( new File( new URI( repository.getUrl() ) ) );
    }

    static void resetSessionData( RepositorySystemSession session )
    {
        session.getData().set( "updateCheckManager.checks", null );
    }

    private UpdateCheck<Metadata, MetadataTransferException> newMetadataCheck()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = new UpdateCheck<>();
        check.setItem( metadata );
        check.setFile( metadata.getFile() );
        check.setRepository( repository );
        check.setAuthoritativeRepository( repository );
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_INTERVAL + ":10" );
        return check;
    }

    private UpdateCheck<Artifact, ArtifactTransferException> newArtifactCheck()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = new UpdateCheck<>();
        check.setItem( artifact );
        check.setFile( artifact.getFile() );
        check.setRepository( repository );
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_INTERVAL + ":10" );
        return check;
    }

    @Test( expected = Exception.class )
    public void testCheckMetadataFailOnNoFile()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setItem( metadata.setFile( null ) );
        check.setFile( null );

        manager.checkMetadata( session, check );
    }

    @Test
    public void testCheckMetadataUpdatePolicyRequired()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();

        Calendar cal = Calendar.getInstance();
        cal.add( Calendar.DATE, -1 );
        check.setLocalLastUpdated( cal.getTimeInMillis() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
        manager.checkMetadata( session, check );
        assertNull( check.getException() );
        assertTrue( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkMetadata( session, check );
        assertNull( check.getException() );
        assertTrue( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_INTERVAL + ":60" );
        manager.checkMetadata( session, check );
        assertNull( check.getException() );
        assertTrue( check.isRequired() );
    }

    @Test
    public void testCheckMetadataUpdatePolicyNotRequired()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();

        check.setLocalLastUpdated( System.currentTimeMillis() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        manager.checkMetadata( session, check );
        assertFalse( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkMetadata( session, check );
        assertFalse( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_INTERVAL + ":61" );
        manager.checkMetadata( session, check );
        assertFalse( check.isRequired() );

        check.setPolicy( "no particular policy" );
        manager.checkMetadata( session, check );
        assertFalse( check.isRequired() );
    }

    @Test
    public void testCheckMetadata()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );

        // existing file, never checked before
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );

        // just checked
        manager.touchMetadata( session, check );
        resetSessionData( session );

        check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_INTERVAL + ":60" );

        manager.checkMetadata( session, check );
        assertEquals( false, check.isRequired() );

        // no local file
        check.getFile().delete();
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
        // (! file.exists && ! repoKey) -> no timestamp
    }

    @Test
    public void testCheckMetadataNoLocalFile()
    {
        metadata.getFile().delete();

        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();

        long lastUpdate = new Date().getTime() - HOUR;
        check.setLocalLastUpdated( lastUpdate );

        // ! file.exists && updateRequired -> check in remote repo
        check.setLocalLastUpdated( lastUpdate );
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckMetadataNotFoundInRepoCachingEnabled()
    {
        metadata.getFile().delete();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();

        check.setException( new MetadataNotFoundException( metadata, repository, "" ) );
        manager.touchMetadata( session, check );
        resetSessionData( session );

        // ! file.exists && ! updateRequired -> artifact not found in remote repo
        check = newMetadataCheck().setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkMetadata( session, check );
        assertEquals( false, check.isRequired() );
        assertTrue( check.getException() instanceof MetadataNotFoundException );
        assertTrue( check.getException().isFromCache() );
    }

    @Test
    public void testCheckMetadataNotFoundInRepoCachingDisabled()
    {
        metadata.getFile().delete();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( false, false ) );

        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();

        check.setException( new MetadataNotFoundException( metadata, repository, "" ) );
        manager.touchMetadata( session, check );
        resetSessionData( session );

        // ! file.exists && updateRequired -> check in remote repo
        check = newMetadataCheck().setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
        assertNull( check.getException() );
    }

    @Test
    public void testCheckMetadataErrorFromRepoCachingEnabled()
    {
        metadata.getFile().delete();

        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );

        check.setException( new MetadataTransferException( metadata, repository, "some error" ) );
        manager.touchMetadata( session, check );
        resetSessionData( session );

        // ! file.exists && ! updateRequired && previousError -> depends on transfer error caching
        check = newMetadataCheck();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( false, true ) );
        manager.checkMetadata( session, check );
        assertEquals( false, check.isRequired() );
        assertTrue( check.getException() instanceof MetadataTransferException );
        assertTrue( String.valueOf( check.getException() ), check.getException().getMessage().contains( "some error" ) );
        assertTrue( check.getException().isFromCache() );
    }

    @Test
    public void testCheckMetadataErrorFromRepoCachingDisabled()
    {
        metadata.getFile().delete();

        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );

        check.setException( new MetadataTransferException( metadata, repository, "some error" ) );
        manager.touchMetadata( session, check );
        resetSessionData( session );

        // ! file.exists && ! updateRequired && previousError -> depends on transfer error caching
        check = newMetadataCheck();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( false, false ) );
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
        assertNull( check.getException() );
    }

    @Test
    public void testCheckMetadataAtMostOnceDuringSessionEvenIfUpdatePolicyAlways()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );

        // first check
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );

        manager.touchMetadata( session, check );

        // second check in same session
        manager.checkMetadata( session, check );
        assertEquals( false, check.isRequired() );
    }

    @Test
    public void testCheckMetadataSessionStateModes()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
        manager.touchMetadata( session, check );

        session.setConfigProperty( DefaultUpdateCheckManager.CONFIG_PROP_SESSION_STATE, "bypass" );
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );

        resetSessionData( session );
        manager.touchMetadata( session, check );

        // TODO This will be changed to 'enabled' in a future version
        session.setConfigProperty( DefaultUpdateCheckManager.CONFIG_PROP_SESSION_STATE, "true" );
        manager.checkMetadata( session, check );
        assertEquals( false, check.isRequired() );

        // TODO This will be changed to 'disabled' in a future version
        session.setConfigProperty( DefaultUpdateCheckManager.CONFIG_PROP_SESSION_STATE, "false" );
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckMetadataAtMostOnceDuringSessionEvenIfUpdatePolicyAlways_InvalidFile()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
        check.setFileValid( false );

        // first check
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );

        // first touch, without exception
        manager.touchMetadata( session, check );

        // another check in same session
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );

        // another touch, with exception
        check.setException( new MetadataNotFoundException( check.getItem(), check.getRepository() ) );
        manager.touchMetadata( session, check );

        // another check in same session
        manager.checkMetadata( session, check );
        assertEquals( false, check.isRequired() );
    }

    @Test
    public void testCheckMetadataAtMostOnceDuringSessionEvenIfUpdatePolicyAlways_DifferentRepoIdSameUrl()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
        check.setFileValid( false );

        // first check
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );

        manager.touchMetadata( session, check );

        // second check in same session but for repo with different id
        check.setRepository( new RemoteRepository.Builder( check.getRepository() ).setId( "check" ).build() );
        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckMetadataWhenLocallyMissingEvenIfUpdatePolicyIsNever()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        check.getFile().delete();
        assertEquals( check.getFile().getAbsolutePath(), false, check.getFile().exists() );

        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckMetadataWhenLocallyPresentButInvalidEvenIfUpdatePolicyIsNever()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        manager.touchMetadata( session, check );
        resetSessionData( session );

        check.setFileValid( false );

        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckMetadataWhenLocallyDeletedEvenIfTimestampUpToDate()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        manager.touchMetadata( session, check );
        resetSessionData( session );

        check.getFile().delete();
        assertEquals( check.getFile().getAbsolutePath(), false, check.getFile().exists() );

        manager.checkMetadata( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckMetadataNotWhenUpdatePolicyIsNeverAndTimestampIsUnavailable()
    {
        UpdateCheck<Metadata, MetadataTransferException> check = newMetadataCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        manager.checkMetadata( session, check );
        assertEquals( false, check.isRequired() );
    }

    @Test( expected = NullPointerException.class )
    public void testCheckArtifactFailOnNoFile()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setItem( artifact.setFile( null ) );
        check.setFile( null );

        manager.checkArtifact( session, check );
        assertNotNull( check.getException() );
    }

    @Test
    public void testCheckArtifactUpdatePolicyRequired()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setItem( artifact );
        check.setFile( artifact.getFile() );

        Calendar cal = Calendar.getInstance( TimeZone.getTimeZone( "UTC" ) );
        cal.add( Calendar.DATE, -1 );
        long lastUpdate = cal.getTimeInMillis();
        artifact.getFile().setLastModified( lastUpdate );
        check.setLocalLastUpdated( lastUpdate );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
        manager.checkArtifact( session, check );
        assertNull( check.getException() );
        assertTrue( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkArtifact( session, check );
        assertNull( check.getException() );
        assertTrue( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_INTERVAL + ":60" );
        manager.checkArtifact( session, check );
        assertNull( check.getException() );
        assertTrue( check.isRequired() );
    }

    @Test
    public void testCheckArtifactUpdatePolicyNotRequired()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setItem( artifact );
        check.setFile( artifact.getFile() );

        Calendar cal = Calendar.getInstance( TimeZone.getTimeZone( "UTC" ) );
        cal.add( Calendar.HOUR_OF_DAY, -1 );
        check.setLocalLastUpdated( cal.getTimeInMillis() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        manager.checkArtifact( session, check );
        assertFalse( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkArtifact( session, check );
        assertFalse( check.isRequired() );

        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_INTERVAL + ":61" );
        manager.checkArtifact( session, check );
        assertFalse( check.isRequired() );

        check.setPolicy( "no particular policy" );
        manager.checkArtifact( session, check );
        assertFalse( check.isRequired() );
    }

    @Test
    public void testCheckArtifact()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        long fifteenMinutes = new Date().getTime() - ( 15L * 60L * 1000L );
        check.getFile().setLastModified( fifteenMinutes );
        // time is truncated on setLastModfied
        fifteenMinutes = check.getFile().lastModified();

        // never checked before
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );

        // just checked
        check.setLocalLastUpdated( 0L );
        long lastUpdate = new Date().getTime();
        check.getFile().setLastModified( lastUpdate );
        lastUpdate = check.getFile().lastModified();

        manager.checkArtifact( session, check );
        assertEquals( false, check.isRequired() );

        // no local file, no repo timestamp
        check.setLocalLastUpdated( 0L );
        check.getFile().delete();
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckArtifactNoLocalFile()
    {
        artifact.getFile().delete();
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();

        long lastUpdate = new Date().getTime() - HOUR;

        // ! file.exists && updateRequired -> check in remote repo
        check.setLocalLastUpdated( lastUpdate );
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckArtifactNotFoundInRepoCachingEnabled()
    {
        artifact.getFile().delete();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setException( new ArtifactNotFoundException( artifact, repository ) );
        manager.touchArtifact( session, check );
        resetSessionData( session );

        // ! file.exists && ! updateRequired -> artifact not found in remote repo
        check = newArtifactCheck().setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkArtifact( session, check );
        assertEquals( false, check.isRequired() );
        assertTrue( check.getException() instanceof ArtifactNotFoundException );
        assertTrue( check.getException().isFromCache() );
    }

    @Test
    public void testCheckArtifactNotFoundInRepoCachingDisabled()
    {
        artifact.getFile().delete();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( false, false ) );

        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setException( new ArtifactNotFoundException( artifact, repository ) );
        manager.touchArtifact( session, check );
        resetSessionData( session );

        // ! file.exists && updateRequired -> check in remote repo
        check = newArtifactCheck().setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
        assertNull( check.getException() );
    }

    @Test
    public void testCheckArtifactErrorFromRepoCachingEnabled()
    {
        artifact.getFile().delete();

        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        check.setException( new ArtifactTransferException( artifact, repository, "some error" ) );
        manager.touchArtifact( session, check );
        resetSessionData( session );

        // ! file.exists && ! updateRequired && previousError -> depends on transfer error caching
        check = newArtifactCheck();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( false, true ) );
        manager.checkArtifact( session, check );
        assertEquals( false, check.isRequired() );
        assertTrue( check.getException() instanceof ArtifactTransferException );
        assertTrue( check.getException().isFromCache() );
    }

    @Test
    public void testCheckArtifactErrorFromRepoCachingDisabled()
    {
        artifact.getFile().delete();

        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_DAILY );
        check.setException( new ArtifactTransferException( artifact, repository, "some error" ) );
        manager.touchArtifact( session, check );
        resetSessionData( session );

        // ! file.exists && ! updateRequired && previousError -> depends on transfer error caching
        check = newArtifactCheck();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( false, false ) );
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
        assertNull( check.getException() );
    }

    @Test
    public void testCheckArtifactAtMostOnceDuringSessionEvenIfUpdatePolicyAlways()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );

        // first check
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );

        manager.touchArtifact( session, check );

        // second check in same session
        manager.checkArtifact( session, check );
        assertEquals( false, check.isRequired() );
    }

    @Test
    public void testCheckArtifactSessionStateModes()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
        manager.touchArtifact( session, check );

        session.setConfigProperty( DefaultUpdateCheckManager.CONFIG_PROP_SESSION_STATE, "bypass" );
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );

        resetSessionData( session );
        manager.touchArtifact( session, check );

        session.setConfigProperty( DefaultUpdateCheckManager.CONFIG_PROP_SESSION_STATE, "true" );
        manager.checkArtifact( session, check );
        assertEquals( false, check.isRequired() );

        session.setConfigProperty( DefaultUpdateCheckManager.CONFIG_PROP_SESSION_STATE, "false" );
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckArtifactAtMostOnceDuringSessionEvenIfUpdatePolicyAlways_InvalidFile()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );
        check.setFileValid( false );

        // first check
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );

        // first touch, without exception
        manager.touchArtifact( session, check );

        // another check in same session
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );

        // another touch, with exception
        check.setException( new ArtifactNotFoundException( check.getItem(), check.getRepository() ) );
        manager.touchArtifact( session, check );

        // another check in same session
        manager.checkArtifact( session, check );
        assertEquals( false, check.isRequired() );
    }

    @Test
    public void testCheckArtifactAtMostOnceDuringSessionEvenIfUpdatePolicyAlways_DifferentRepoIdSameUrl()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_ALWAYS );

        // first check
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );

        manager.touchArtifact( session, check );

        // second check in same session but for repo with different id
        check.setRepository( new RemoteRepository.Builder( check.getRepository() ).setId( "check" ).build() );
        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckArtifactWhenLocallyMissingEvenIfUpdatePolicyIsNever()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        check.getFile().delete();
        assertEquals( check.getFile().getAbsolutePath(), false, check.getFile().exists() );

        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckArtifactWhenLocallyPresentButInvalidEvenIfUpdatePolicyIsNever()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        manager.touchArtifact( session, check );
        resetSessionData( session );

        check.setFileValid( false );

        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckArtifactWhenLocallyDeletedEvenIfTimestampUpToDate()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        manager.touchArtifact( session, check );
        resetSessionData( session );

        check.getFile().delete();
        assertEquals( check.getFile().getAbsolutePath(), false, check.getFile().exists() );

        manager.checkArtifact( session, check );
        assertEquals( true, check.isRequired() );
    }

    @Test
    public void testCheckArtifactNotWhenUpdatePolicyIsNeverAndTimestampIsUnavailable()
    {
        UpdateCheck<Artifact, ArtifactTransferException> check = newArtifactCheck();
        check.setPolicy( RepositoryPolicy.UPDATE_POLICY_NEVER );
        session.setResolutionErrorPolicy( new SimpleResolutionErrorPolicy( true, false ) );

        manager.checkArtifact( session, check );
        assertEquals( false, check.isRequired() );
    }

}
