/*
 * 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.eclipse.aether.internal.test.util;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;

import org.eclipse.aether.spi.io.FileProcessor;

/**
 * A simple file processor implementation to help satisfy component requirements during tests.
 */
public class TestFileProcessor implements FileProcessor {

    public boolean mkdirs(File directory) {
        if (directory == null) {
            return false;
        }

        if (directory.exists()) {
            return false;
        }
        if (directory.mkdir()) {
            return true;
        }

        File canonDir = null;
        try {
            canonDir = directory.getCanonicalFile();
        } catch (IOException e) {
            return false;
        }

        File parentDir = canonDir.getParentFile();
        return (parentDir != null && (mkdirs(parentDir) || parentDir.exists()) && canonDir.mkdir());
    }

    public void write(File file, String data) throws IOException {
        mkdirs(file.getParentFile());

        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(file);

            if (data != null) {
                fos.write(data.getBytes(StandardCharsets.UTF_8));
            }

            fos.close();
            fos = null;
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (final IOException e) {
                // Suppressed due to an exception already thrown in the try block.
            }
        }
    }

    public void write(File target, InputStream source) throws IOException {
        mkdirs(target.getAbsoluteFile().getParentFile());

        OutputStream fos = null;
        try {
            fos = new BufferedOutputStream(new FileOutputStream(target));

            copy(fos, source, null);

            fos.close();
            fos = null;
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (final IOException e) {
                // Suppressed due to an exception already thrown in the try block.
            }
        }
    }

    public void copy(File source, File target) throws IOException {
        copy(source, target, null);
    }

    public long copy(File source, File target, ProgressListener listener) throws IOException {
        long total = 0;

        InputStream fis = null;
        OutputStream fos = null;
        try {
            fis = new FileInputStream(source);

            mkdirs(target.getAbsoluteFile().getParentFile());

            fos = new BufferedOutputStream(new FileOutputStream(target));

            total = copy(fos, fis, listener);

            fos.close();
            fos = null;

            fis.close();
            fis = null;
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (final IOException e) {
                // Suppressed due to an exception already thrown in the try block.
            } finally {
                try {
                    if (fis != null) {
                        fis.close();
                    }
                } catch (final IOException e) {
                    // Suppressed due to an exception already thrown in the try block.
                }
            }
        }

        return total;
    }

    private long copy(OutputStream os, InputStream is, ProgressListener listener) throws IOException {
        long total = 0L;

        ByteBuffer buffer = ByteBuffer.allocate(1024 * 32);
        byte[] array = buffer.array();

        while (true) {
            int bytes = is.read(array);
            if (bytes < 0) {
                break;
            }

            os.write(array, 0, bytes);

            total += bytes;

            if (listener != null && bytes > 0) {
                try {
                    ((Buffer) buffer).rewind();
                    ((Buffer) buffer).limit(bytes);
                    listener.progressed(buffer);
                } catch (Exception e) {
                    // too bad
                }
            }
        }

        return total;
    }

    public void move(File source, File target) throws IOException {
        target.delete();

        if (!source.renameTo(target)) {
            copy(source, target);

            target.setLastModified(source.lastModified());

            source.delete();
        }
    }

    @Override
    public String readChecksum(final File checksumFile) throws IOException {
        return new String(Files.readAllBytes(checksumFile.toPath()), StandardCharsets.UTF_8);
    }

    @Override
    public void writeChecksum(final File checksumFile, final String checksum) throws IOException {
        write(checksumFile, checksum);
    }
}