/*
 * Copyright 2014 The Codehaus Foundation.
 *
 * Licensed 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.codehaus.plexus.archiver.util;

import javax.annotation.WillClose;
import javax.annotation.WillNotClose;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;

import org.codehaus.plexus.archiver.ArchiverException;
import org.codehaus.plexus.util.IOUtil;

public class Streams {

    public static final InputStream EMPTY_INPUTSTREAM = new ByteArrayInputStream(new byte[0]);

    public static BufferedInputStream bufferedInputStream(InputStream is) {
        return is instanceof BufferedInputStream ? (BufferedInputStream) is : new BufferedInputStream(is, 65536);
    }

    public static BufferedOutputStream bufferedOutputStream(OutputStream os) {
        return os instanceof BufferedOutputStream ? (BufferedOutputStream) os : new BufferedOutputStream(os, 65536);
    }

    public static byte[] cacheBuffer() {
        return new byte[8 * 1024];
    }

    public static InputStream fileInputStream(File file) throws IOException {
        return Files.newInputStream(file.toPath());
    }

    public static InputStream fileInputStream(File file, String operation) throws ArchiverException {
        try {
            return Files.newInputStream(file.toPath());
        } catch (IOException e) {
            throw new ArchiverException(
                    "Problem reading input file for " + operation + " " + file.getParent() + ", " + e.getMessage());
        }
    }

    public static OutputStream fileOutputStream(File file) throws IOException {
        return Files.newOutputStream(file.toPath());
    }

    public static OutputStream fileOutputStream(File file, String operation) throws ArchiverException {
        try {
            return Files.newOutputStream(file.toPath());
        } catch (IOException e) {
            throw new ArchiverException(
                    "Problem creating output file for " + operation + " " + file.getParent() + ", " + e.getMessage());
        }
    }

    public static void copyFully(@WillClose InputStream zIn, @WillClose OutputStream out, String gzip)
            throws ArchiverException {
        // There must be 1 million libs out there that do this
        try {
            copyFullyDontCloseOutput(zIn, out, gzip);
            out.close();
            out = null;
        } catch (final IOException e) {
            throw new ArchiverException("Failure copying.", e);
        } finally {
            IOUtil.close(out);
        }
    }

    public static void copyFullyDontCloseOutput(@WillClose InputStream zIn, @WillNotClose OutputStream out, String gzip)
            throws ArchiverException {
        // There must be 1 million libs out there that do this
        try {
            byte[] buffer = cacheBuffer();
            int count = 0;
            do {
                try {
                    out.write(buffer, 0, count);
                } catch (IOException e) {
                    throw new ArchiverException(
                            "Problem writing to output in " + gzip + " operation " + e.getMessage());
                }
                count = zIn.read(buffer, 0, buffer.length);
            } while (count != -1);
            zIn.close();
            zIn = null;
        } catch (IOException e) {
            throw new ArchiverException("Problem reading from source file in " + gzip + " operation " + e.getMessage());

        } finally {
            IOUtil.close(zIn);
        }
    }
}
