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package dev.jbang.net.jdkproviders;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * This JDK provider is intended to detects JDKs that have been installed in
 * standard location of the users linux distro.
 *
 * For now just using `/usr/lib/jvm` as apparently fedora, debian, ubuntu and
 * centos/rhel use it.
 *
 * If need different behavior per linux distro its intended this provider will
 * adjust based on identified distro.
 *
 */
public class LinuxJdkProvider extends BaseFoldersJdkProvider {
	private static final Path JDKS_ROOT = Paths.get("/usr/lib/jvm");

	@Nonnull
	@Override
	protected Path getJdksRoot() {
		return JDKS_ROOT;
	}

	@Nullable
	@Override
	protected String jdkId(String name) {
		return name + "-linux";
	}

	@Override
	public boolean canUse() {
		return Files.isDirectory(JDKS_ROOT);
	}

	@Override
	protected boolean acceptFolder(Path jdkFolder) {
		return super.acceptFolder(jdkFolder) && !isSameFolderSymLink(jdkFolder);
	}

	// Returns true if a path is a symlink to an entry in the same folder
	private boolean isSameFolderSymLink(Path jdkFolder) {
		Path absFolder = jdkFolder.toAbsolutePath();
		if (Files.isSymbolicLink(absFolder)) {
			try {
				Path realPath = absFolder.toRealPath();
				return Files.isSameFile(absFolder.getParent(), realPath.getParent());
			} catch (IOException e) {
				/* ignore */ }
		}
		return false;
	}
}