package org.eclipse.aether.transport.classpath;

/*
 * 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.io.FileNotFoundException;
import java.net.URI;
import java.nio.charset.StandardCharsets;

import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.internal.test.util.TestFileUtils;
import org.eclipse.aether.internal.test.util.TestUtils;
import org.eclipse.aether.repository.RemoteRepository;
import org.eclipse.aether.spi.connector.transport.GetTask;
import org.eclipse.aether.spi.connector.transport.PeekTask;
import org.eclipse.aether.spi.connector.transport.PutTask;
import org.eclipse.aether.spi.connector.transport.Transporter;
import org.eclipse.aether.spi.connector.transport.TransporterFactory;
import org.eclipse.aether.transfer.NoTransporterException;
import org.eclipse.aether.transfer.TransferCancelledException;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 */
public class ClasspathTransporterTest
{

    private DefaultRepositorySystemSession session;

    private TransporterFactory factory;

    private Transporter transporter;

    private RemoteRepository newRepo( String url )
    {
        return new RemoteRepository.Builder( "test", "default", url ).build();
    }

    private void newTransporter( String url )
        throws Exception
    {
        if ( transporter != null )
        {
            transporter.close();
            transporter = null;
        }
        transporter = factory.newInstance( session, newRepo( url ) );
    }

    @Before
    public void setUp()
        throws Exception
    {
        session = TestUtils.newSession();
        factory = new ClasspathTransporterFactory( );
        newTransporter( "classpath:/repository" );
    }

    @After
    public void tearDown()
    {
        if ( transporter != null )
        {
            transporter.close();
            transporter = null;
        }
        factory = null;
        session = null;
    }

    @Test
    public void testClassify()
    {
        assertEquals( Transporter.ERROR_OTHER, transporter.classify( new FileNotFoundException() ) );
        assertEquals( Transporter.ERROR_NOT_FOUND, transporter.classify( new ResourceNotFoundException( "test" ) ) );
    }

    @Test
    public void testPeek()
        throws Exception
    {
        transporter.peek( new PeekTask( URI.create( "file.txt" ) ) );
    }

    @Test
    public void testPeek_NotFound()
        throws Exception
    {
        try
        {
            transporter.peek( new PeekTask( URI.create( "missing.txt" ) ) );
            fail( "Expected error" );
        }
        catch ( ResourceNotFoundException e )
        {
            assertEquals( Transporter.ERROR_NOT_FOUND, transporter.classify( e ) );
        }
    }

    @Test
    public void testPeek_Closed()
        throws Exception
    {
        transporter.close();
        try
        {
            transporter.peek( new PeekTask( URI.create( "missing.txt" ) ) );
            fail( "Expected error" );
        }
        catch ( IllegalStateException e )
        {
            assertEquals( Transporter.ERROR_OTHER, transporter.classify( e ) );
        }
    }

    @Test
    public void testGet_ToMemory()
        throws Exception
    {
        RecordingTransportListener listener = new RecordingTransportListener();
        GetTask task = new GetTask( URI.create( "file.txt" ) ).setListener( listener );
        transporter.get( task );
        assertEquals( "test", task.getDataString() );
        assertEquals( 0L, listener.dataOffset );
        assertEquals( 4L, listener.dataLength );
        assertEquals( 1, listener.startedCount );
        assertTrue( "Count: " + listener.progressedCount, listener.progressedCount > 0 );
        assertEquals( task.getDataString(), new String( listener.baos.toByteArray(), StandardCharsets.UTF_8 ) );
    }

    @Test
    public void testGet_ToFile()
        throws Exception
    {
        File file = TestFileUtils.createTempFile( "failure" );
        RecordingTransportListener listener = new RecordingTransportListener();
        GetTask task = new GetTask( URI.create( "file.txt" ) ).setDataFile( file ).setListener( listener );
        transporter.get( task );
        assertEquals( "test", TestFileUtils.readString( file ) );
        assertEquals( 0L, listener.dataOffset );
        assertEquals( 4L, listener.dataLength );
        assertEquals( 1, listener.startedCount );
        assertTrue( "Count: " + listener.progressedCount, listener.progressedCount > 0 );
        assertEquals( "test", new String( listener.baos.toByteArray(), StandardCharsets.UTF_8 ) );
    }

    @Test
    public void testGet_EmptyResource()
        throws Exception
    {
        File file = TestFileUtils.createTempFile( "failure" );
        RecordingTransportListener listener = new RecordingTransportListener();
        GetTask task = new GetTask( URI.create( "empty.txt" ) ).setDataFile( file ).setListener( listener );
        transporter.get( task );
        assertEquals( "", TestFileUtils.readString( file ) );
        assertEquals( 0L, listener.dataOffset );
        assertEquals( 0L, listener.dataLength );
        assertEquals( 1, listener.startedCount );
        assertEquals( 0, listener.progressedCount );
        assertEquals( "", new String( listener.baos.toByteArray(), StandardCharsets.UTF_8 ) );
    }

    @Test
    public void testGet_EncodedResourcePath()
        throws Exception
    {
        GetTask task = new GetTask( URI.create( "some%20space.txt" ) );
        transporter.get( task );
        assertEquals( "space", task.getDataString() );
    }

    @Test
    public void testGet_Fragment()
        throws Exception
    {
        GetTask task = new GetTask( URI.create( "file.txt#ignored" ) );
        transporter.get( task );
        assertEquals( "test", task.getDataString() );
    }

    @Test
    public void testGet_Query()
        throws Exception
    {
        GetTask task = new GetTask( URI.create( "file.txt?ignored" ) );
        transporter.get( task );
        assertEquals( "test", task.getDataString() );
    }

    @Test
    public void testGet_FileHandleLeak()
        throws Exception
    {
        for ( int i = 0; i < 100; i++ )
        {
            File file = TestFileUtils.createTempFile( "failure" );
            transporter.get( new GetTask( URI.create( "file.txt" ) ).setDataFile( file ) );
            assertTrue( i + ", " + file.getAbsolutePath(), file.delete() );
        }
    }

    @Test
    public void testGet_NotFound()
        throws Exception
    {
        try
        {
            transporter.get( new GetTask( URI.create( "missing.txt" ) ) );
            fail( "Expected error" );
        }
        catch ( ResourceNotFoundException e )
        {
            assertEquals( Transporter.ERROR_NOT_FOUND, transporter.classify( e ) );
        }
    }

    @Test
    public void testGet_Closed()
        throws Exception
    {
        transporter.close();
        try
        {
            transporter.get( new GetTask( URI.create( "file.txt" ) ) );
            fail( "Expected error" );
        }
        catch ( IllegalStateException e )
        {
            assertEquals( Transporter.ERROR_OTHER, transporter.classify( e ) );
        }
    }

    @Test
    public void testGet_StartCancelled()
        throws Exception
    {
        RecordingTransportListener listener = new RecordingTransportListener();
        listener.cancelStart = true;
        GetTask task = new GetTask( URI.create( "file.txt" ) ).setListener( listener );
        try
        {
            transporter.get( task );
            fail( "Expected error" );
        }
        catch ( TransferCancelledException e )
        {
            assertEquals( Transporter.ERROR_OTHER, transporter.classify( e ) );
        }
        assertEquals( 0L, listener.dataOffset );
        assertEquals( 4L, listener.dataLength );
        assertEquals( 1, listener.startedCount );
        assertEquals( 0, listener.progressedCount );
    }

    @Test
    public void testGet_ProgressCancelled()
        throws Exception
    {
        RecordingTransportListener listener = new RecordingTransportListener();
        listener.cancelProgress = true;
        GetTask task = new GetTask( URI.create( "file.txt" ) ).setListener( listener );
        try
        {
            transporter.get( task );
            fail( "Expected error" );
        }
        catch ( TransferCancelledException e )
        {
            assertEquals( Transporter.ERROR_OTHER, transporter.classify( e ) );
        }
        assertEquals( 0L, listener.dataOffset );
        assertEquals( 4L, listener.dataLength );
        assertEquals( 1, listener.startedCount );
        assertEquals( 1, listener.progressedCount );
    }

    @Test
    public void testPut()
        throws Exception
    {
        try
        {
            transporter.put( new PutTask( URI.create( "missing.txt" ) ) );
            fail( "Expected error" );
        }
        catch ( UnsupportedOperationException e )
        {
            assertEquals( Transporter.ERROR_OTHER, transporter.classify( e ) );
        }
    }

    @Test
    public void testPut_Closed()
        throws Exception
    {
        transporter.close();
        try
        {
            transporter.put( new PutTask( URI.create( "missing.txt" ) ) );
            fail( "Expected error" );
        }
        catch ( IllegalStateException e )
        {
            assertEquals( Transporter.ERROR_OTHER, transporter.classify( e ) );
        }
    }

    @Test( expected = NoTransporterException.class )
    public void testInit_BadProtocol()
        throws Exception
    {
        newTransporter( "bad:/void" );
    }

    @Test
    public void testInit_CaseInsensitiveProtocol()
        throws Exception
    {
        newTransporter( "classpath:/void" );
        newTransporter( "CLASSPATH:/void" );
        newTransporter( "ClassPath:/void" );
    }

    @Test
    public void testInit_OpaqueUrl()
        throws Exception
    {
        testInit( "classpath:repository" );
    }

    @Test
    public void testInit_OpaqueUrlTrailingSlash()
        throws Exception
    {
        testInit( "classpath:repository/" );
    }

    @Test
    public void testInit_OpaqueUrlSpaces()
        throws Exception
    {
        testInit( "classpath:repo%20space" );
    }

    @Test
    public void testInit_HierarchicalUrl()
        throws Exception
    {
        testInit( "classpath:/repository" );
    }

    @Test
    public void testInit_HierarchicalUrlTrailingSlash()
        throws Exception
    {
        testInit( "classpath:/repository/" );
    }

    @Test
    public void testInit_HierarchicalUrlSpaces()
        throws Exception
    {
        testInit( "classpath:/repo%20space" );
    }

    @Test
    public void testInit_HierarchicalUrlRoot()
        throws Exception
    {
        testInit( "classpath:/" );
    }

    @Test
    public void testInit_HierarchicalUrlNoPath()
        throws Exception
    {
        testInit( "classpath://reserved" );
    }

    private void testInit( String base )
        throws Exception
    {
        newTransporter( base );
        GetTask task = new GetTask( URI.create( "file.txt" ) );
        transporter.get( task );
        assertEquals( "test", task.getDataString() );
    }

}
