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/*
 * Copyright 2023 Greptime Team
 *
 * 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.greptime.common.util;

import java.io.File;
import java.io.IOException;
import java.nio.channels.FileChannel;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;

/**
 * File utilities.
 */
public class Files {

    /**
     * Calls fsync on a file or directory.
     *
     * @param file file or directory
     * @throws IOException if an I/O error occurs
     */
    public static void fsync(File file) throws IOException {
        boolean isDir = file.isDirectory();
        // Can't fsync on Windows.
        if (isDir && Platform.isWindows()) {
            return;
        }

        try (FileChannel fc =
                FileChannel.open(file.toPath(), isDir ? StandardOpenOption.READ : StandardOpenOption.WRITE)) {
            fc.force(true);
        }
    }

    /**
     * Creates the directory named by this pathname if not exists.
     *
     * @param path pathname
     */
    public static void mkdirIfNotExists(String path) throws IOException {
        File dir = Paths.get(path).toFile().getAbsoluteFile();
        if (dir.exists()) {
            if (!dir.isDirectory()) {
                throw new IOException("File " + dir + " exists and is not a directory. Unable to create directory.");
            }
        } else if (!dir.mkdirs() && !dir.isDirectory()) {
            // Double-check that some other thread or process hasn't made
            // the directory in the background
            throw new IOException("Unable to create directory " + dir);
        }
    }
}