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/*
 * Copyright 2012-2015 the original author or authors.
 *
 * 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 io.joshworks.snappy.loader.archive;

import io.joshworks.snappy.loader.data.RandomAccessData.ResourceAccess;
import io.joshworks.snappy.loader.jar.JarEntryData;
import io.joshworks.snappy.loader.jar.JarEntryFilter;
import io.joshworks.snappy.loader.jar.JarFile;
import io.joshworks.snappy.loader.util.AsciiBytes;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.UUID;
import java.util.jar.JarEntry;
import java.util.jar.Manifest;

/**
 * {@link Archive} implementation backed by a {@link JarFile}.
 *
 * @author Phillip Webb
 * @author Andy Wilkinson
 */
public class JarFileArchive extends Archive {

    private static final AsciiBytes UNPACK_MARKER = new AsciiBytes("UNPACK:");

    private static final int BUFFER_SIZE = 32 * 1024;

    private final JarFile jarFile;

    private final List entries;

    private URL url;

    private File tempUnpackFolder;

    public JarFileArchive(File file) throws IOException {
        this(file, null);
    }

    public JarFileArchive(File file, URL url) throws IOException {
        this(new JarFile(file));
        this.url = url;
    }

    public JarFileArchive(JarFile jarFile) {
        this.jarFile = jarFile;
        ArrayList jarFileEntries = new ArrayList();
        for (JarEntryData data : jarFile) {
            jarFileEntries.add(new JarFileEntry(data));
        }
        this.entries = Collections.unmodifiableList(jarFileEntries);
    }

    @Override
    public URL getUrl() throws MalformedURLException {
        if (this.url != null) {
            return this.url;
        }
        return this.jarFile.getUrl();
    }

    @Override
    public Manifest getManifest() throws IOException {
        return this.jarFile.getManifest();
    }

    @Override
    public List getNestedArchives(EntryFilter filter) throws IOException {
        List nestedArchives = new ArrayList();
        for (Entry entry : getEntries()) {
            if (filter.matches(entry)) {
                nestedArchives.add(getNestedArchive(entry));
            }
        }
        return Collections.unmodifiableList(nestedArchives);
    }

    @Override
    public Collection getEntries() {
        return Collections.unmodifiableCollection(this.entries);
    }

    protected Archive getNestedArchive(Entry entry) throws IOException {
        JarEntryData data = ((JarFileEntry) entry).getJarEntryData();
        if (data.getComment().startsWith(UNPACK_MARKER)) {
            return getUnpackedNestedArchive(data);
        }
        JarFile jarFile = this.jarFile.getNestedJarFile(data);
        return new JarFileArchive(jarFile);
    }

    private Archive getUnpackedNestedArchive(JarEntryData data) throws IOException {
        String name = data.getName().toString();
        if (name.lastIndexOf("/") != -1) {
            name = name.substring(name.lastIndexOf("/") + 1);
        }
        File file = new File(getTempUnpackFolder(), name);
        if (!file.exists() || file.length() != data.getSize()) {
            unpack(data, file);
        }
        return new JarFileArchive(file, file.toURI().toURL());
    }

    private File getTempUnpackFolder() {
        if (this.tempUnpackFolder == null) {
            File tempFolder = new File(System.getProperty("java.io.tmpdir"));
            this.tempUnpackFolder = createUnpackFolder(tempFolder);
        }
        return this.tempUnpackFolder;
    }

    private File createUnpackFolder(File parent) {
        int attempts = 0;
        while (attempts++ < 1000) {
            String fileName = new File(this.jarFile.getName()).getName();
            File unpackFolder = new File(parent,
                    fileName + "-spring-boot-libs-" + UUID.randomUUID());
            if (unpackFolder.mkdirs()) {
                return unpackFolder;
            }
        }
        throw new IllegalStateException(
                "Failed to create unpack folder in directory '" + parent + "'");
    }

    private void unpack(JarEntryData data, File file) throws IOException {
        InputStream inputStream = data.getData().getInputStream(ResourceAccess.ONCE);
        try {
            OutputStream outputStream = new FileOutputStream(file);
            try {
                byte[] buffer = new byte[BUFFER_SIZE];
                int bytesRead = -1;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
                outputStream.flush();
            } finally {
                outputStream.close();
            }
        } finally {
            inputStream.close();
        }
    }

    @Override
    public Archive getFilteredArchive(final EntryRenameFilter filter) throws IOException {
        JarFile filteredJar = this.jarFile.getFilteredJarFile(new JarEntryFilter() {
            @Override
            public AsciiBytes apply(AsciiBytes name, JarEntryData entryData) {
                return filter.apply(name, new JarFileEntry(entryData));
            }
        });
        return new JarFileArchive(filteredJar);
    }

    /**
     * {@link Archive.Entry} implementation backed by a {@link JarEntry}.
     */
    private static class JarFileEntry implements Entry {

        private final JarEntryData entryData;

        JarFileEntry(JarEntryData entryData) {
            this.entryData = entryData;
        }

        public JarEntryData getJarEntryData() {
            return this.entryData;
        }

        @Override
        public boolean isDirectory() {
            return this.entryData.isDirectory();
        }

        @Override
        public AsciiBytes getName() {
            return this.entryData.getName();
        }

    }

}