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    package dev.jbang.cli;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.PosixFilePermission;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import dev.jbang.Cache;
import dev.jbang.Settings;
import dev.jbang.catalog.CatalogUtil;
import dev.jbang.dependencies.DependencyUtil;
import dev.jbang.net.JdkManager;
import dev.jbang.net.JdkProvider;
import dev.jbang.source.Project;
import dev.jbang.source.ProjectBuilder;
import dev.jbang.util.CommandBuffer;
import dev.jbang.util.UnpackUtil;
import dev.jbang.util.Util;

import picocli.CommandLine;

@CommandLine.Command(name = "app", description = "Manage scripts installed on the user's PATH as commands.", subcommands = {
		AppInstall.class, AppList.class,
		AppUninstall.class, AppSetup.class })
public class App {

	public static void deleteCommandFiles(String name) {
		try (Stream files = Files.list(Settings.getConfigBinDir())) {
			files	.filter(f -> f.getFileName().toString().equals(name)
							|| f.getFileName().toString().startsWith(name + "."))
					.forEach(f -> Util.deletePath(f, true));
		} catch (IOException e) {
			// Ignore
		}
	}
}

@CommandLine.Command(name = "install", description = "Install a script as a command.")
class AppInstall extends BaseCommand {
	private static final String jbangUrl = "https://www.jbang.dev/releases/latest/download/jbang.zip";

	@CommandLine.Option(names = {
			"--force" }, description = "Force re-installation")
	boolean force;

	@CommandLine.Option(names = { "--name" }, description = "A name for the command")
	String name;

	@CommandLine.Mixin
	ScriptMixin scriptMixin;

	@CommandLine.Mixin
	BuildMixin buildMixin;

	@CommandLine.Mixin
	DependencyInfoMixin dependencyInfoMixin;

	@CommandLine.Mixin
	NativeMixin nativeMixin;

	@CommandLine.Mixin
	JdkProvidersMixin jdkProvidersMixin;

	@CommandLine.Mixin
	RunMixin runMixin;

	@CommandLine.Option(names = { "--enable-preview" }, description = "Activate Java preview features")
	Boolean enablePreviewRequested;

	@CommandLine.Parameters(index = "1..*", arity = "0..*", description = "Parameters to pass on to the script")
	public List userParams = new ArrayList<>();

	@Override
	public Integer doCall() {
		scriptMixin.validate();
		boolean installed = false;
		try {
			if (scriptMixin.scriptOrFile.equals("jbang")) {
				if (name != null && !"jbang".equals(name)) {
					throw new IllegalArgumentException(
							"It's not possible to install jbang with a different name");
				}
				installed = installJBang(force);
			} else {
				if ("jbang".equals(name)) {
					throw new IllegalArgumentException("jbang is a reserved name.");
				}
				if (name != null && !CatalogUtil.isValidName(name)) {
					throw new IllegalArgumentException("Not a valid command name: '" + name + "'");
				}
				List runOpts = collectRunOptions();
				installed = install(name, scriptMixin.scriptOrFile, force, runOpts, userParams);
			}
			if (installed) {
				if (AppSetup.needsSetup()) {
					return AppSetup.setup(AppSetup.guessWithJava(), false, false);
				}
			}
		} catch (IOException e) {
			throw new ExitException(EXIT_INTERNAL_ERROR, "Could not install command", e);
		}
		return EXIT_OK;
	}

	private List collectRunOptions() {
		List opts = new ArrayList<>();
		opts.addAll(scriptMixin.opts());
		opts.addAll(buildMixin.opts());
		opts.addAll(dependencyInfoMixin.opts());
		opts.addAll(nativeMixin.opts());
		opts.addAll(jdkProvidersMixin.opts());
		opts.addAll(runMixin.opts());
		if (Boolean.TRUE.equals(enablePreviewRequested)) {
			opts.add("--enable-preview");
		}
		return opts;
	}

	public static boolean install(String name, String scriptRef, boolean force, List runOpts,
			List runArgs) throws IOException {
		Path binDir = Settings.getConfigBinDir();
		if (!force && name != null && existScripts(binDir, name)) {
			Util.infoMsg("A script with name '" + name + "' already exists, use '--force' to install anyway.");
			return false;
		}
		ProjectBuilder pb = Project.builder();
		Project prj = pb.build(scriptRef);
		if (name == null) {
			name = CatalogUtil.nameFromRef(scriptRef);
			if (!force && existScripts(binDir, name)) {
				Util.infoMsg("A script with name '" + name + "' already exists, use '--force' to install anyway.");
				return false;
			}
		}
		if (!pb.isAlias(prj.getResourceRef()) && !DependencyUtil.looksLikeAGav(scriptRef)
				&& !prj.getResourceRef().isURL()) {
			scriptRef = prj.getResourceRef().getFile().toAbsolutePath().toString();
		}
		prj.codeBuilder().build();
		installScripts(name, scriptRef, runOpts, runArgs);
		Util.infoMsg("Command installed: " + name);
		return true;
	}

	private static boolean existScripts(Path binDir, String name) {
		return Files.exists(binDir.resolve(name)) || Files.exists(binDir.resolve(name + ".cmd"))
				|| Files.exists(binDir.resolve(name + ".ps1"));
	}

	private static void installScripts(String name, String scriptRef, List runOpts, List runArgs)
			throws IOException {
		Path binDir = Settings.getConfigBinDir();
		binDir.toFile().mkdirs();
		if (Util.isWindows()) {
			installCmdScript(binDir.resolve(name + ".cmd"), scriptRef, runOpts, runArgs);
			installPSScript(binDir.resolve(name + ".ps1"), scriptRef, runOpts, runArgs);
			// Script references on Linux/Mac should never contain backslashes
			String nixRef = scriptRef.replace('\\', '/');
			installShellScript(binDir.resolve(name), nixRef, runOpts, runArgs);
		} else {
			installShellScript(binDir.resolve(name), scriptRef, runOpts, runArgs);
		}
	}

	private static void installShellScript(Path file, String scriptRef, List runOpts, List runArgs)
			throws IOException {
		List cmd = new ArrayList<>();
		cmd.addAll(Arrays.asList("exec", "jbang", "run"));
		cmd.addAll(runOpts);
		cmd.add(scriptRef);
		cmd.addAll(runArgs);
		CommandBuffer cb = CommandBuffer.of(cmd);
		List lines = Arrays.asList("#!/bin/sh", cb.asCommandLine(Util.Shell.bash) + " \"$@\"");
		Files.write(file, lines, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE);
		if (!Util.isWindows()) {
			setExecutable(file);
		}
	}

	private static void setExecutable(Path file) {
		final Set permissions;
		try {
			permissions = Files.getPosixFilePermissions(file);
			permissions.add(PosixFilePermission.OWNER_EXECUTE);
			permissions.add(PosixFilePermission.GROUP_EXECUTE);
			Files.setPosixFilePermissions(file, permissions);
		} catch (UnsupportedOperationException | IOException e) {
			throw new ExitException(EXIT_GENERIC_ERROR, "Couldn't mark script as executable: " + file, e);
		}
	}

	private static void installCmdScript(Path file, String scriptRef, List runOpts, List runArgs)
			throws IOException {
		List cmd = new ArrayList<>();
		cmd.addAll(Arrays.asList("jbang", "run"));
		cmd.addAll(runOpts);
		cmd.add(scriptRef);
		cmd.addAll(runArgs);
		CommandBuffer cb = CommandBuffer.of(cmd);
		List lines = Arrays.asList("@echo off", cb.asCommandLine(Util.Shell.cmd) + " %*");
		Files.write(file, lines, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE);
	}

	private static void installPSScript(Path file, String scriptRef, List runOpts, List runArgs)
			throws IOException {
		List cmd = new ArrayList<>();
		cmd.addAll(Arrays.asList("jbang", "run"));
		cmd.addAll(runOpts);
		cmd.add(scriptRef);
		cmd.addAll(runArgs);
		CommandBuffer cb = CommandBuffer.of(cmd);
		List lines = Collections.singletonList(cb.asCommandLine(Util.Shell.powershell) + " @args");
		Files.write(file, lines, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE);
	}

	public static boolean installJBang(boolean force) throws IOException {
		Path binDir = Settings.getConfigBinDir();
		boolean managedJBang = Files.exists(binDir.resolve("jbang.jar"));

		if (!force && (managedJBang || Util.searchPath("jbang") != null)) {
			Util.infoMsg("jbang is already available, re-run with --force to install anyway.");
			return false;
		}

		if (force || !managedJBang) {
			if (!Util.isOffline()) {
				Util.withCacheEvict(() -> {
					// Download JBang and unzip to ~/.jbang/bin/
					Util.infoMsg("Downloading and installing jbang...");
					Path zipFile = Util.downloadAndCacheFile(jbangUrl);
					Path urlsDir = Settings.getCacheDir(Cache.CacheClass.urls);
					Util.deletePath(urlsDir.resolve("jbang"), true);
					UnpackUtil.unpack(zipFile, urlsDir);
					App.deleteCommandFiles("jbang");
					Path fromDir = urlsDir.resolve("jbang").resolve("bin");
					copyJBangFiles(fromDir, binDir);
					return 0;
				});
			} else {
				Path jar = Util.getJarLocation();
				if (!jar.toString().endsWith(".jar")) {
					throw new ExitException(EXIT_GENERIC_ERROR, "Could not determine jbang location");
				}
				Path fromDir = jar.getParent();
				if (fromDir.endsWith(".jbang")) {
					fromDir = fromDir.getParent();
				}
				copyJBangFiles(fromDir, binDir);
			}
		} else {
			Util.infoMsg("jbang is already installed.");
		}
		return true;
	}

	private static void copyJBangFiles(Path from, Path to) throws IOException {
		to.toFile().mkdirs();
		Stream	.of("jbang", "jbang.cmd", "jbang.ps1", "jbang.jar")
				.map(Paths::get)
				.forEach(f -> {
					try {
						Path fromp = from.resolve(f);
						Path top = to.resolve(f);
						if (f.endsWith("jbang.jar")) {
							if (!Files.isReadable(fromp)) {
								fromp = from.resolve(".jbang/jbang.jar");
							}
							if (Util.isWindows() && Files.isRegularFile(top)) {
								top = to.resolve("jbang.jar.new");
							}
						}
						Files.copy(fromp, top, StandardCopyOption.REPLACE_EXISTING,
								StandardCopyOption.COPY_ATTRIBUTES);
					} catch (IOException e) {
						throw new ExitException(EXIT_GENERIC_ERROR, "Could not copy " + f.toString(), e);
					}
				});
	}
}

@CommandLine.Command(name = "list", description = "Lists installed commands.")
class AppList extends BaseCommand {

	@CommandLine.Mixin
	FormatMixin formatMixin;

	@Override
	public Integer doCall() {
		if (formatMixin.format == FormatMixin.Format.json) {
			Gson parser = new GsonBuilder().disableHtmlEscaping().setPrettyPrinting().create();
			parser.toJson(listCommandFiles(), System.out);
		} else {
			listCommandFiles().forEach(app -> System.out.println(app.name));
		}
		return EXIT_OK;
	}

	static class AppOut {
		String name;

		public String getName() {
			return name;
		}

		public AppOut(Path file) {
			name = Util.base(file.getFileName().toString());
		}
	}

	private static List listCommandFiles() {
		try (Stream files = Files.list(Settings.getConfigBinDir())) {
			return files
						.filter(Files::isExecutable)
						.sorted()
						.map(AppOut::new)
						.filter(distinctByKey(AppOut::getName))
						.collect(Collectors.toList());
		} catch (IOException e) {
			return Collections.emptyList();
		}
	}

	private static  Predicate distinctByKey(Function keyExtractor) {
		Set seen = ConcurrentHashMap.newKeySet();
		return t -> seen.add(keyExtractor.apply(t));
	}
}

@CommandLine.Command(name = "uninstall", description = "Removes a previously installed command.")
class AppUninstall extends BaseCommand {

	@CommandLine.Parameters(paramLabel = "name", index = "0", description = "The name of the command", arity = "1")
	String name;

	@Override
	public Integer doCall() {
		if (commandFilesExist(name)) {
			App.deleteCommandFiles(name);
			Util.infoMsg("Command removed: " + name);
			return EXIT_OK;
		} else {
			Util.infoMsg("Command not found: " + name);
			return EXIT_INVALID_INPUT;
		}
	}

	private static boolean commandFilesExist(String name) {
		try (Stream files = Files.list(Settings.getConfigBinDir())) {
			return files.anyMatch(f -> f.getFileName().toString().equals(name)
					|| f.getFileName().toString().startsWith(name + "."));
		} catch (IOException e) {
			return false;
		}
	}
}

@CommandLine.Command(name = "setup", description = "Make jbang commands available for the user.")
class AppSetup extends BaseCommand {

	@CommandLine.Option(names = {
			"--java" }, description = "Add JBang's Java to the user's environment as well", negatable = true)
	Boolean java;

	@CommandLine.Option(names = {
			"--force" }, description = "Force setup to be performed even when existing configuration has been detected")
	boolean force;

	@Override
	public Integer doCall() {
		boolean withJava;
		if (java == null) {
			withJava = guessWithJava();
		} else {
			withJava = java;
		}
		return setup(withJava, force, true);
	}

	public static boolean needsSetup() {
		String envPath = System.getenv("PATH");
		Path binDir = Settings.getConfigBinDir();
		return !envPath.toLowerCase().contains(binDir.toString().toLowerCase());
	}

	/**
	 * Makes a best guess if JAVA_HOME should be set by us or not. Returns true if
	 * no JAVA_HOME is set and javac wasn't found on the PATH and we have at least
	 * one managed JDK installed by us. Otherwise it returns false.
	 */
	public static boolean guessWithJava() {
		boolean withJava;
		JdkProvider.Jdk defJdk = JdkManager.getJdk(null, false);
		String javaHome = System.getenv("JAVA_HOME");
		Path javacCmd = Util.searchPath("javac");
		withJava = defJdk != null
				&& (javaHome == null
						|| javaHome.isEmpty()
						|| javaHome.toLowerCase().startsWith(Settings.getConfigDir().toString().toLowerCase()))
				&& (javacCmd == null || javacCmd.startsWith(Settings.getConfigBinDir()));
		return withJava;
	}

	public static int setup(boolean withJava, boolean force, boolean chatty) {
		Path jdkHome = null;
		if (withJava) {
			JdkProvider.Jdk defJdk = JdkManager.getDefaultJdk();
			if (defJdk == null) {
				Util.infoMsg("No default JDK set, use 'jbang jdk default ' to set one.");
				return EXIT_UNEXPECTED_STATE;
			}
			jdkHome = Settings.getCurrentJdkDir();
		}

		Path binDir = Settings.getConfigBinDir();
		binDir.toFile().mkdirs();

		boolean changed = false;
		String cmd = "";
		// Permanently add JBang's bin folder to the user's PATH
		if (Util.isWindows()) {
			String env = "";
			if (withJava) {
				String newPath = jdkHome.resolve("bin") + ";";
				env += " ; [Environment]::SetEnvironmentVariable('Path', '" + newPath + "' + " +
						"[Environment]::GetEnvironmentVariable('Path', [EnvironmentVariableTarget]::User), " +
						"[EnvironmentVariableTarget]::User)";
				env += " ; [Environment]::SetEnvironmentVariable('JAVA_HOME', '" + jdkHome + "', " +
						"[EnvironmentVariableTarget]::User)";
			}
			if (force || needsSetup()) {
				// Create the command to change the user's PATH
				String newPath = binDir + ";";
				env += " ; [Environment]::SetEnvironmentVariable('Path', '" + newPath + "' + " +
						"[Environment]::GetEnvironmentVariable('Path', [EnvironmentVariableTarget]::User), " +
						"[EnvironmentVariableTarget]::User)";
			}
			if (!env.isEmpty()) {
				if (Util.getShell() == Util.Shell.powershell) {
					cmd = "{ " + env + " }";
				} else {
					cmd = "powershell -NoProfile -ExecutionPolicy Bypass -NonInteractive -Command \"" + env + "\" & ";
				}
				changed = true;
			}
		} else {
			if (force || needsSetup() || withJava) {
				// Update shell startup scripts
				if (Util.isMac()) {
					Path bashFile = getHome().resolve(".bash_profile");
					changed = changeScript(binDir, jdkHome, bashFile) || changed;
				}
				if (!changed) {
					Path bashFile = getHome().resolve(".bashrc");
					changed = changeScript(binDir, jdkHome, bashFile) || changed;
				}
				Path zshRcFile = getHome().resolve(".zshrc");
				changed = changeScript(binDir, jdkHome, zshRcFile) || changed;
			}
		}

		if (changed) {
			Util.infoMsg("Setting up JBang environment...");
		} else if (chatty) {
			Util.infoMsg("JBang environment is already set up.");
			Util.infoMsg("(You can use --force to perform the setup anyway)");
		}
		if (Util.getShell() == Util.Shell.bash) {
			if (changed) {
				System.err.println("Please start a new Shell for changes to take effect");
			}
		} else {
			if (changed) {
				if (Util.getShell() == Util.Shell.powershell) {
					System.err.println("Please start a new PowerShell for changes to take effect");
				} else {
					System.err.println("Please open a new CMD window for changes to take effect");
				}
			}
		}
		if (!cmd.isEmpty()) {
			System.out.println(cmd);
			return EXIT_EXECUTE;
		} else {
			return EXIT_OK;
		}
	}

	private static boolean changeScript(Path binDir, Path javaHome, Path bashFile) {
		try {
			// Detect if JBang has already been set up before
			boolean jbangFound = Files.exists(bashFile)
					&& Files.lines(bashFile)
							.anyMatch(ln -> ln.trim().startsWith("#") && ln.toLowerCase().contains("jbang"));
			if (!jbangFound) {
				// Add lines to add JBang to PATH
				String lines = "\n# Add JBang to environment\n" +
						"alias j!=jbang\n";
				if (javaHome != null) {
					lines += "export PATH=\"" + toHomePath(binDir) + ":" + toHomePath(javaHome.resolve("bin"))
							+ ":$PATH\"\n" +
							"export JAVA_HOME=" + toHomePath(javaHome) + "\n";
				} else {
					lines += "export PATH=\"" + toHomePath(binDir) + ":$PATH\"\n";
				}
				Files.write(bashFile, lines.getBytes(), StandardOpenOption.APPEND, StandardOpenOption.CREATE);
				Util.verboseMsg("Added JBang setup lines " + bashFile);
				return true;
			}
		} catch (IOException e) {
			Util.verboseMsg("Couldn't change script: " + bashFile, e);
		}
		return false;
	}

	private static Path getHome() {
		return Paths.get(System.getProperty("user.home"));
	}

	private static String toHomePath(Path path) {
		Path home = getHome();
		if (path.startsWith(home)) {
			if (Util.isWindows()) {
				return "%userprofile%\\" + home.relativize(path);
			} else {
				return "$HOME/" + home.relativize(path);
			}
		} else {
			return path.toString();
		}
	}
}
    
    
    
    

    




    
    
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