package net.minecraft.server.packs.repository;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.List;
import net.minecraft.world.level.validation.DirectoryValidator;
import net.minecraft.world.level.validation.ForbiddenSymlinkInfo;
import org.jspecify.annotations.Nullable;

public abstract class PackDetector<T> {
	private final DirectoryValidator validator;

	protected PackDetector(final DirectoryValidator validator) {
		this.validator = validator;
	}

	@Nullable
	public T detectPackResources(final Path content, final List<ForbiddenSymlinkInfo> issues) throws IOException {
		Path targetContext = content;

		BasicFileAttributes attributes;
		try {
			attributes = Files.readAttributes(content, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
		} catch (NoSuchFileException var6) {
			return null;
		}

		if (attributes.isSymbolicLink()) {
			this.validator.validateSymlink(content, issues);
			if (!issues.isEmpty()) {
				return null;
			}

			targetContext = Files.readSymbolicLink(content);
			attributes = Files.readAttributes(targetContext, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
		}

		if (attributes.isDirectory()) {
			this.validator.validateKnownDirectory(targetContext, issues);
			if (!issues.isEmpty()) {
				return null;
			} else {
				return !Files.isRegularFile(targetContext.resolve("pack.mcmeta"), new LinkOption[0]) ? null : this.createDirectoryPack(targetContext);
			}
		} else {
			return attributes.isRegularFile() && targetContext.getFileName().toString().endsWith(".zip") ? this.createZipPack(targetContext) : null;
		}
	}

	@Nullable
	protected abstract T createZipPack(final Path content) throws IOException;

	@Nullable
	protected abstract T createDirectoryPack(final Path content) throws IOException;
}