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package dev.jbang.net;

import static dev.jbang.cli.BaseCommand.EXIT_UNEXPECTED_STATE;

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

import dev.jbang.Cache;
import dev.jbang.Settings;
import dev.jbang.cli.ExitException;
import dev.jbang.util.UnpackUtil;
import dev.jbang.util.Util;

public class KotlinManager {
	private static final String KOTLIN_DOWNLOAD_URL = "https://github.com/JetBrains/kotlin/releases/download/v%s/kotlin-compiler-%s.zip";
	public static final String DEFAULT_KOTLIN_VERSION = "2.0.21";

	public static String resolveInKotlinHome(String cmd, String requestedVersion) {
		Path kotlinHome = getKotlin(requestedVersion);
		if (kotlinHome != null) {
			Path dir = kotlinHome.toAbsolutePath().resolve("bin");
			Path cmdPath = Util.searchPath(cmd, dir.toString());
			return cmdPath != null ? cmdPath.toString() : cmd;
		}
		return cmd;
	}

	public static Path getKotlin(String requestedVersion) {
		Path kotlinPath = getKotlinPath(requestedVersion);
		if (!Files.isDirectory(kotlinPath)) {
			kotlinPath = downloadAndInstallKotlin(requestedVersion);
		}
		return kotlinPath.resolve("kotlinc");
	}

	public static Path downloadAndInstallKotlin(String version) {
		Util.infoMsg("Downloading Kotlin " + version + ". Be patient, this can take several minutes...");
		String url = String.format(KOTLIN_DOWNLOAD_URL, version, version);
		Util.verboseMsg("Downloading " + url);
		Path kotlinDir = getKotlinPath(version);
		Path kotlinTmpDir = kotlinDir.getParent().resolve(kotlinDir.getFileName().toString() + ".tmp");
		Path kotlinOldDir = kotlinDir.getParent().resolve(kotlinDir.getFileName().toString() + ".old");
		Util.deletePath(kotlinTmpDir, false);
		Util.deletePath(kotlinOldDir, false);
		try {
			Path kotlinPkg = Util.downloadAndCacheFile(url);
			Util.infoMsg("Installing Kotlin " + version + "...");
			Util.verboseMsg("Unpacking to " + kotlinDir);
			UnpackUtil.unpack(kotlinPkg, kotlinTmpDir);
			if (Files.isDirectory(kotlinDir)) {
				Files.move(kotlinDir, kotlinOldDir);
			}
			Files.move(kotlinTmpDir, kotlinDir);
			Util.deletePath(kotlinOldDir, false);
			return kotlinDir;
		} catch (Exception e) {
			Util.deletePath(kotlinTmpDir, true);
			if (!Files.isDirectory(kotlinDir) && Files.isDirectory(kotlinOldDir)) {
				try {
					Files.move(kotlinOldDir, kotlinDir);
				} catch (IOException ex) {
					// Ignore
				}
			}
			Util.errorMsg("Required Kotlin version not possible to download or install.");
			throw new ExitException(EXIT_UNEXPECTED_STATE,
					"Unable to download or install kotlinc version " + version, e);
		}
	}

	public static Path getKotlinPath(String version) {
		return getKotlincsPath().resolve(version);
	}

	private static Path getKotlincsPath() {
		return Settings.getCacheDir(Cache.CacheClass.kotlincs);
	}

}