/*
 * 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.
 */

package org.apache.ftpserver.ftpletcontainer;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.SocketException;
import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.commons.net.ftp.FTPConnectionClosedException;
import org.apache.ftpserver.FtpServerFactory;
import org.apache.ftpserver.clienttests.ClientTestTemplate;
import org.apache.ftpserver.ftplet.FtpException;
import org.apache.ftpserver.ftplet.FtpRequest;
import org.apache.ftpserver.ftplet.FtpSession;
import org.apache.ftpserver.ftplet.Ftplet;
import org.apache.ftpserver.ftplet.FtpletResult;
import org.apache.ftpserver.test.TestUtil;

/**
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*
*/
public class FtpLetReturnDisconnectTest extends ClientTestTemplate {
    private static final byte[] TESTDATA = "TESTDATA".getBytes();

    private static final byte[] DOUBLE_TESTDATA = "TESTDATATESTDATA".getBytes();

    private static final File TEST_FILE1 = new File(ROOT_DIR, "test1.txt");

    private static final File TEST_FILE2 = new File(ROOT_DIR, "test2.txt");

    private static final File TEST_DIR1 = new File(ROOT_DIR, "dir1");

    protected FtpletResult mockReturnValue = FtpletResult.DISCONNECT;

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.ftpserver.clienttests.ClientTestTemplate#setUp()
     */
    @Override
    protected void setUp() throws Exception {
        MockFtplet.callback = new MockFtpletCallback();

        initDirs();

        initServer();

        connectClient();
    }

    @Override
    protected FtpServerFactory createServer() throws Exception {
        FtpServerFactory server = super.createServer();

        Map<String, Ftplet> ftplets = new LinkedHashMap<>();
        ftplets.put("f1", new MockFtplet());
        server.setFtplets(ftplets);
        
        return server;
    }

    public void testExceptionDuringLogin() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onLogin(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        try {
            client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }
    }

    public void testExceptionDuringDeleteStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onDeleteStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.deleteFile(TEST_FILE1.getName());
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertTrue(TEST_FILE1.exists());
    }

    public void testExceptionDuringDeleteEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onDeleteEnd(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        assertTrue(client.deleteFile(TEST_FILE1.getName()));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertFalse(TEST_FILE1.exists());
    }

    public void testExceptionDuringMkdirStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onMkdirStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.makeDirectory(TEST_DIR1.getName());
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertFalse(TEST_DIR1.exists());
    }

    public void testExceptionDuringMkdirEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onMkdirEnd(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        assertTrue(client.makeDirectory(TEST_DIR1.getName()));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertTrue(TEST_DIR1.exists());
    }

    public void testExceptionDuringRmdirStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onRmdirStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TEST_DIR1.mkdirs();

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.removeDirectory(TEST_DIR1.getName());
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertTrue(TEST_DIR1.exists());
    }

    public void testExceptionDuringRmdirEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onRmdirEnd(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TEST_DIR1.mkdirs();

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        assertTrue(client.removeDirectory(TEST_DIR1.getName()));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertFalse(TEST_DIR1.exists());
    }

    public void testExceptionDuringSite() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onSite(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.site("HELP");
            client.completePendingCommand();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }
    }

    public void testExceptionDuringRenameStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onRenameStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.rename(TEST_FILE1.getName(), TEST_FILE2.getName());
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertTrue(TEST_FILE1.exists());
        assertFalse(TEST_FILE2.exists());
    }

    public void testExceptionDuringRenameEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onRenameEnd(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        assertTrue(client.rename(TEST_FILE1.getName(), TEST_FILE2.getName()));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertFalse(TEST_FILE1.exists());
        assertTrue(TEST_FILE2.exists());

    }

    public void testExceptionDuringDownloadStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onDownloadStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.retrieveFileStream(TEST_FILE1.getName());
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }
    }

    public void testExceptionDuringDownloadEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onDownloadEnd(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        assertTrue(client.retrieveFile(TEST_FILE1.getName(), baos));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        TestUtil.assertArraysEqual(TESTDATA, baos.toByteArray());
    }

    public void testExceptionDuringAppendStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onAppendStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.appendFile(TEST_FILE1.getName(), new ByteArrayInputStream(
                    TESTDATA));
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        TestUtil.assertFileEqual(TESTDATA, TEST_FILE1);
    }

    public void testExceptionDuringAppendEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onAppendEnd(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                // throwException();
                return mockReturnValue;
            }
        };

        TestUtil.writeDataToFile(TEST_FILE1, TESTDATA);

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        assertTrue(client.appendFile(TEST_FILE1.getName(),
                new ByteArrayInputStream(TESTDATA)));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        TestUtil.assertFileEqual(DOUBLE_TESTDATA, TEST_FILE1);
    }

    public void testExceptionDuringUploadStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onUploadStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.storeFile(TEST_FILE1.getName(), new ByteArrayInputStream(
                    TESTDATA));
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertFalse(TEST_FILE1.exists());
    }

    public void testExceptionDuringUploadEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onUploadEnd(FtpSession session, FtpRequest request)
                    throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        assertTrue(client.storeFile(TEST_FILE1.getName(),
                new ByteArrayInputStream(TESTDATA)));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        TestUtil.assertFileEqual(TESTDATA, TEST_FILE1);
    }

    public void testExceptionDuringUploadUniqueStart() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onUploadUniqueStart(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();
                return mockReturnValue;
            }
        };

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        try {
            client.storeUniqueFile(TEST_FILE1.getName(),
                    new ByteArrayInputStream(TESTDATA));
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        assertEquals(ROOT_DIR.listFiles().length, 0);
    }

    public void testExceptionDuringUploadUniqueEnd() throws Exception {
        MockFtplet.callback = new MockFtpletCallback() {
            @Override
            public FtpletResult onUploadUniqueEnd(FtpSession session,
                    FtpRequest request) throws FtpException, IOException {
                throwException();

                return mockReturnValue;
            }
        };

        client.login(ADMIN_USERNAME, ADMIN_PASSWORD);
        assertTrue(client.storeUniqueFile(new ByteArrayInputStream(TESTDATA)));
        try {
            client.noop();
            fail("Must throw FTPConnectionClosedException");
        } catch (FTPConnectionClosedException e) {
            // OK
        } catch (SocketException e) {
            // OK
        }

        TestUtil.assertFileEqual(TESTDATA, ROOT_DIR.listFiles()[0]);
    }

    /**
     * @throws FtpException  
     * @throws IOException 
     */
    protected void throwException() throws FtpException, IOException {
        // do not throw, we want to check the result of return values
    }
}