/*

 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.javac.file;

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.io.OutputStreamWriter;

import java.io.Writer;

import java.lang.ref.Reference;

import java.lang.ref.SoftReference;

import java.net.URI;

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.nio.charset.CharsetDecoder;

import javax.tools.JavaFileObject;

import java.text.Normalizer;

/**

 * A subclass of JavaFileObject representing regular files.

 *

 * <p><b>This is NOT part of any supported API.

 * If you write code that depends on this, you do so at your own risk.

 * This code and its internal interfaces are subject to change or

 * deletion without notice.</b>

 */

class RegularFileObject extends BaseFileObject {

    /** Have the parent directories been created?

     */

    private boolean hasParents = false;

    private String name;

    final File file;

    private Reference<File> absFileRef;

    final static boolean isMacOS = System.getProperty("os.name", "").contains("OS X");

    public RegularFileObject(JavacFileManager fileManager, File f) {

        this(fileManager, f.getName(), f);

    }

    public RegularFileObject(JavacFileManager fileManager, String name, File f) {

        super(fileManager);

        if (f.isDirectory()) {

            throw new IllegalArgumentException("directories not supported");

        }

        this.name = name;

        this.file = f;

        if (f.lastModified() > System.currentTimeMillis())

            fileManager.log.warning("file.from.future", f);

    }

    @Override

    public URI toUri() {

        return file.toURI().normalize();

    }

    @Override

    public String getName() {

        return file.getPath();

    }

    @Override

    public String getShortName() {

        return name;

    }

    @Override

    public JavaFileObject.Kind getKind() {

        return getKind(name);

    }

    @Override

    public InputStream openInputStream() throws IOException {

        return new FileInputStream(file);

    }

    @Override

    public OutputStream openOutputStream() throws IOException {

        fileManager.flushCache(this);

        ensureParentDirectoriesExist();

        return new FileOutputStream(file);

    }

    @Override

    public CharBuffer getCharContent(boolean ignoreEncodingErrors) throws IOException {

        CharBuffer cb = fileManager.getCachedContent(this);

        if (cb == null) {

            try (InputStream in = new FileInputStream(file)) {

                ByteBuffer bb = fileManager.makeByteBuffer(in);

                JavaFileObject prev = fileManager.log.useSource(this);

                try {

                    cb = fileManager.decode(bb, ignoreEncodingErrors);

                } finally {

                    fileManager.log.useSource(prev);

                }

                fileManager.recycleByteBuffer(bb);

                if (!ignoreEncodingErrors) {

                    fileManager.cache(this, cb);

                }

            }

        }

        return cb;

    }

    @Override

    public Writer openWriter() throws IOException {

        fileManager.flushCache(this);

        ensureParentDirectoriesExist();

        return new OutputStreamWriter(new FileOutputStream(file), fileManager.getEncodingName());

    }

    @Override

    public long getLastModified() {

        return file.lastModified();

    }

    @Override

    public boolean delete() {

        return file.delete();

    }

    @Override

    protected CharsetDecoder getDecoder(boolean ignoreEncodingErrors) {

        return fileManager.getDecoder(fileManager.getEncodingName(), ignoreEncodingErrors);

    }

    @Override

    protected String inferBinaryName(Iterable<? extends File> path) {

        String fPath = file.getPath();

        //System.err.println("RegularFileObject " + file + " " +r.getPath());

        for (File dir: path) {

            //System.err.println("dir: " + dir);

            String dPath = dir.getPath();

            if (dPath.length() == 0)

                dPath = System.getProperty("user.dir");

            if (!dPath.endsWith(File.separator))

                dPath += File.separator;

            if (fPath.regionMatches(true, 0, dPath, 0, dPath.length())

                && new File(fPath.substring(0, dPath.length())).equals(new File(dPath))) {

                String relativeName = fPath.substring(dPath.length());

                return removeExtension(relativeName).replace(File.separatorChar, '.');

            }

        }

        return null;

    }

    @Override

    public boolean isNameCompatible(String cn, JavaFileObject.Kind kind) {

        cn.getClass();

        // null check

        if (kind == Kind.OTHER && getKind() != kind) {

            return false;

        }

        String n = cn + kind.extension;

        if (name.equals(n)) {

            return true;

        }

        if (isMacOS && Normalizer.isNormalized(name, Normalizer.Form.NFD)

            && Normalizer.isNormalized(n, Normalizer.Form.NFC)) {

            // On Mac OS X it is quite possible to file name and class

            // name normalized in a different way - in that case we have to normalize file name

            // to the Normal Form Compised (NFC)

            String normName = Normalizer.normalize(name, Normalizer.Form.NFC);

            if (normName.equals(n)) {

                this.name = normName;

                return true;

            }

        }

            if (name.equalsIgnoreCase(n)) {

            try {

                // allow for Windows

                return file.getCanonicalFile().getName().equals(n);

            } catch (IOException e) {

            }

        }

        return false;

    }

    private void ensureParentDirectoriesExist() throws IOException {

        if (!hasParents) {

            File parent = file.getParentFile();

            if (parent != null && !parent.exists()) {

                if (!parent.mkdirs()) {

                    if (!parent.exists() || !parent.isDirectory()) {

                        throw new IOException("could not create parent directories");

                    }

                }

            }

            hasParents = true;

        }

    }

    /**

     * Check if two file objects are equal.

     * Two RegularFileObjects are equal if the absolute paths of the underlying

     * files are equal.

     */

    @Override

    public boolean equals(Object other) {

        if (this == other)

            return true;

        if (!(other instanceof RegularFileObject))

            return false;

        RegularFileObject o = (RegularFileObject) other;

        return getAbsoluteFile().equals(o.getAbsoluteFile());

    }

    @Override

    public int hashCode() {

        return getAbsoluteFile().hashCode();

    }

    private File getAbsoluteFile() {

        File absFile = (absFileRef == null ? null : absFileRef.get());

        if (absFile == null) {

            absFile = file.getAbsoluteFile();

            absFileRef = new SoftReference<>(absFile);

        }

        return absFile;

    }

}