package io.gitlab.jfronny.modsmod.util;

import java.io.IOException;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;

public class IOUtil {
    public static void deleteRecursive(Path path) throws IOException {
        Files.walkFileTree(path, new SimpleFileVisitor<>() {
            @Override
            public FileVisitResult visitFile(Path path, BasicFileAttributes basicFileAttributes) throws IOException {
                Files.delete(path);
                return FileVisitResult.CONTINUE;
            }
            @Override
            public FileVisitResult postVisitDirectory(Path path, IOException e) throws IOException {
                Files.delete(path);
                return FileVisitResult.CONTINUE;
            }
        });
    }

    public static void clearDirectory(Path path) throws IOException {
        deleteRecursive(path);
        Files.createDirectory(path);
    }

    public static boolean contentEquals(final Path a, final Path b) throws IOException {
        try (final FileChannel fca = FileChannel.open(a, StandardOpenOption.READ);
             final FileChannel fcb = FileChannel.open(b, StandardOpenOption.READ)) {
            final MappedByteBuffer mbba = fca.map(FileChannel.MapMode.READ_ONLY, 0, fca.size());
            final MappedByteBuffer mbbb = fcb.map(FileChannel.MapMode.READ_ONLY, 0, fcb.size());
            return mbba.equals(mbbb);
        }
    }
}