/**
 * 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.camel.component.file.remote;

import java.io.File;
import java.io.FilenameFilter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

import org.apache.camel.CamelExecutionException;
import org.apache.camel.Exchange;
import org.apache.camel.component.file.GenericFileOperationFailedException;
import org.junit.Test;

/**
 *
 */
public class FtpProducerMoveExistingTest extends FtpServerTestSupport {

    private String getFtpUrl() {
        return "ftp://admin@localhost:" + getPort() + "/move?password=admin&fileExist=Move";
    }

    @Test
    public void testExistingFileDoesNotExists() throws Exception {
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}", "Hello World", Exchange.FILE_NAME, "hello.txt");

        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertFileNotExists(FTP_ROOT_DIR + "/move/renamed-hello.txt");
    }

    @Test
    public void testExistingFileExists() throws Exception {
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}", "Hello World", Exchange.FILE_NAME, "hello.txt");
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}", "Bye World", Exchange.FILE_NAME, "hello.txt");

        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertEquals("Bye World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/hello.txt")));

        assertFileExists(FTP_ROOT_DIR + "/move/renamed-hello.txt");
        assertEquals("Hello World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/renamed-hello.txt")));
    }

    @Test
    public void testExistingFileExistsTempFilename() throws Exception {
        template.sendBodyAndHeader(getFtpUrl() + "&tempFileName=${file:onlyname}.temp&moveExisting=${file:parent}/renamed-${file:onlyname}", "Hello World", Exchange.FILE_NAME, "hello.txt");
        template.sendBodyAndHeader(getFtpUrl() + "&tempFileName=${file:onlyname}.temp&moveExisting=${file:parent}/renamed-${file:onlyname}", "Bye World", Exchange.FILE_NAME, "hello.txt");

        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertEquals("Bye World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/hello.txt")));

        assertFileExists(FTP_ROOT_DIR + "/move/renamed-hello.txt");
        assertEquals("Hello World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/renamed-hello.txt")));
    }

    @Test
    public void testExistingFileExistsTempFileNameMoveDynamicSubdir() throws Exception {
        final String subdirPrefix = generateRandomString(5);
        template.sendBodyAndHeader(getFtpUrl() + "&tempFileName=${file:onlyname}.temp&moveExisting=" + subdirPrefix + "-${date:now:yyyyMMddHHmmssSSS}/",
                "Hello World", Exchange.FILE_NAME, "hello.txt");
        template.sendBodyAndHeader(getFtpUrl() + "&tempFileName=${file:onlyname}.temp&moveExisting=" + subdirPrefix + "-${date:now:yyyyMMddHHmmssSSS}/",
                "Bye World", Exchange.FILE_NAME, "hello.txt");
        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertEquals("Bye World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/hello.txt")));

        File folder = new File(FTP_ROOT_DIR + "/move");
        String[] directories = folder.list(new FilenameFilter() {
            @Override
            public boolean accept(File current, String name) {
                String date = new SimpleDateFormat("yyyyMMdd").format(new Date());
                return new File(current, name).isDirectory() && name.startsWith(subdirPrefix + "-" + date);
            }
        });
        assertEquals(1, directories.length);
        File movedFilePath = new File(FTP_ROOT_DIR + "/move/" + directories[0] + "/hello.txt");

        assertTrue(movedFilePath.exists());
        assertEquals("Hello World", context.getTypeConverter().convertTo(String.class, movedFilePath));
    }

    @Test
    public void testExistingFileExistsTempFilenameMoveSubDir() throws Exception {
        template.sendBodyAndHeader(getFtpUrl() + "&tempFileName=${file:onlyname}.temp&moveExisting=archive", "Hello World", Exchange.FILE_NAME, "hello.txt");
        template.sendBodyAndHeader(getFtpUrl() + "&tempFileName=${file:onlyname}.temp&moveExisting=archive", "Bye World", Exchange.FILE_NAME, "hello.txt");

        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertEquals("Bye World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/hello.txt")));

        assertFileExists(FTP_ROOT_DIR + "/move/archive/hello.txt");
        assertEquals("Hello World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/archive/hello.txt")));
    }

    @Test
    public void testExistingFileExistsMoveToSubDir() throws Exception {
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=backup", "Hello World", Exchange.FILE_NAME, "hello.txt");
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=backup", "Bye World", Exchange.FILE_NAME, "hello.txt");

        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertEquals("Bye World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/hello.txt")));
        // would move into sub directory and keep existing name as is
        assertFileExists(FTP_ROOT_DIR + "/move/backup/hello.txt");
        assertEquals("Hello World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/backup/hello.txt")));
    }

    @Test
    public void testFailOnMoveExistingFileExistsEagerDeleteTrue() throws Exception {
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}&eagerDeleteTargetFile=true", "Old file", Exchange.FILE_NAME, "renamed-hello.txt");

        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}&eagerDeleteTargetFile=true", "Hello World", Exchange.FILE_NAME, "hello.txt");
        // we should be okay as we will just delete any existing file
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}&eagerDeleteTargetFile=true", "Bye World", Exchange.FILE_NAME, "hello.txt");

        // we could write the new file so the old context should be there
        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertEquals("Bye World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/hello.txt")));

        // and the renamed file should be overridden
        assertFileExists(FTP_ROOT_DIR + "/move/renamed-hello.txt");
        assertEquals("Hello World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/renamed-hello.txt")));
    }

    @Test
    public void testFailOnMoveExistingFileExistsEagerDeleteFalse() throws Exception {
        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}&eagerDeleteTargetFile=true", "Old file", Exchange.FILE_NAME, "renamed-hello.txt");

        template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}&eagerDeleteTargetFile=false", "Hello World", Exchange.FILE_NAME, "hello.txt");
        try {
            template.sendBodyAndHeader(getFtpUrl() + "&moveExisting=${file:parent}/renamed-${file:onlyname}&eagerDeleteTargetFile=false", "Bye World", Exchange.FILE_NAME, "hello.txt");
            fail("Should have thrown an exception");
        } catch (CamelExecutionException e) {
            GenericFileOperationFailedException cause = assertIsInstanceOf(GenericFileOperationFailedException.class, e.getCause());
            assertTrue(cause.getMessage().startsWith("Cannot moved existing file"));
        }

        // we could not write the new file so the previous context should be there
        assertFileExists(FTP_ROOT_DIR + "/move/hello.txt");
        assertEquals("Hello World", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/hello.txt")));

        // and the renamed file should be untouched
        assertFileExists(FTP_ROOT_DIR + "/move/renamed-hello.txt");
        assertEquals("Old file", context.getTypeConverter().convertTo(String.class, new File(FTP_ROOT_DIR + "/move/renamed-hello.txt")));
    }

    @Override
    public boolean isUseRouteBuilder() {
        return false;
    }

    private String generateRandomString(int targetStringLength) {
        int leftLimit = 97; // letter 'a'
        int rightLimit = 122; // letter 'z'
        Random random = new Random();
        StringBuilder buffer = new StringBuilder(targetStringLength);
        for (int i = 0; i < targetStringLength; i++) {
            int randomLimitedInt = leftLimit + (int)
                    (random.nextFloat() * (rightLimit - leftLimit + 1));
            buffer.append((char) randomLimitedInt);
        }
        return buffer.toString();
    }
}
