/*
    * Copyright (C) 2008-2009, Google Inc. and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  
  package org.eclipse.jgit.pgm;
  
  import java.io.File;
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.URISyntaxException;
  import java.text.MessageFormat;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.Executors;
  
  import org.eclipse.jgit.errors.ConfigInvalidException;
  import org.eclipse.jgit.internal.ketch.KetchLeader;
  import org.eclipse.jgit.internal.ketch.KetchLeaderCache;
  import org.eclipse.jgit.internal.ketch.KetchPreReceive;
  import org.eclipse.jgit.internal.ketch.KetchSystem;
  import org.eclipse.jgit.internal.ketch.KetchText;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.lib.StoredConfig;
  import org.eclipse.jgit.pgm.internal.CLIText;
  import org.eclipse.jgit.storage.file.FileBasedConfig;
  import org.eclipse.jgit.storage.file.WindowCacheConfig;
  import org.eclipse.jgit.storage.pack.PackConfig;
  import org.eclipse.jgit.transport.DaemonClient;
  import org.eclipse.jgit.transport.DaemonService;
  import org.eclipse.jgit.transport.ReceivePack;
  import org.eclipse.jgit.transport.resolver.FileResolver;
  import org.eclipse.jgit.transport.resolver.ReceivePackFactory;
  import org.eclipse.jgit.transport.resolver.ServiceNotEnabledException;
  import org.eclipse.jgit.util.FS;
  import org.eclipse.jgit.util.SystemReader;
  import org.kohsuke.args4j.Argument;
  import org.kohsuke.args4j.Option;
  
  @Command(common = true, usage = "usage_exportRepositoriesOverGit")
  class Daemon extends TextBuiltin {
  	@Option(name = "--config-file", metaVar = "metaVar_configFile", usage = "usage_configFile")
  	File configFile;
  
  	@Option(name = "--port", metaVar = "metaVar_port", usage = "usage_portNumberToListenOn")
  	int port = org.eclipse.jgit.transport.Daemon.DEFAULT_PORT;
  
  	@Option(name = "--listen", metaVar = "metaVar_hostName", usage = "usage_hostnameOrIpToListenOn")
  	String host;
  
  	@Option(name = "--timeout", metaVar = "metaVar_seconds", usage = "usage_abortConnectionIfNoActivity")
  	int timeout = -1;
  
  	@Option(name = "--enable", metaVar = "metaVar_service", usage = "usage_enableTheServiceInAllRepositories")
  	List<String> enable = new ArrayList<>();
  
  	@Option(name = "--disable", metaVar = "metaVar_service", usage = "usage_disableTheServiceInAllRepositories")
  	List<String> disable = new ArrayList<>();
  
  	@Option(name = "--allow-override", metaVar = "metaVar_service", usage = "usage_configureTheServiceInDaemonServicename")
  	List<String> canOverride = new ArrayList<>();
  
  	@Option(name = "--forbid-override", metaVar = "metaVar_service", usage = "usage_configureTheServiceInDaemonServicename")
  	List<String> forbidOverride = new ArrayList<>();
  
  	@Option(name = "--export-all", usage = "usage_exportWithoutGitDaemonExportOk")
  	boolean exportAll;
  
  	@Option(name = "--ketch", metaVar = "metaVar_ketchServerType", usage = "usage_ketchServerType")
  	KetchServerType ketchServerType;
  
  	enum KetchServerType {
  		LEADER;
  	}
  
  	@Argument(required = true, metaVar = "metaVar_directory", usage = "usage_directoriesToExport")
  	List<File> directory = new ArrayList<>();
  
  	/** {@inheritDoc} */
  	@Override
  	protected boolean requiresRepository() {
  		return false;
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	protected void run() throws Exception {
  		PackConfig packConfig = new PackConfig();
  		StoredConfig cfg;
  		if (configFile == null) {
  			cfg = getUserConfig();
  		} else {
  			if (!configFile.exists()) {
  				throw die(MessageFormat.format(
 						CLIText.get().configFileNotFound, //
 						configFile.getAbsolutePath()));
 			}
 			cfg = new FileBasedConfig(configFile, FS.DETECTED);
 		}
 		cfg.load();
 		new WindowCacheConfig().fromConfig(cfg).install();
 		packConfig.fromConfig(cfg);
 
 		int threads = packConfig.getThreads();
 		if (threads <= 0)
 			threads = Runtime.getRuntime().availableProcessors();
 		if (1 < threads)
 			packConfig.setExecutor(Executors.newFixedThreadPool(threads));
 
 		final FileResolver<DaemonClient> resolver = new FileResolver<>();
 		for (File f : directory) {
 			outw.println(MessageFormat.format(CLIText.get().exporting, f.getAbsolutePath()));
 			resolver.exportDirectory(f);
 		}
 		resolver.setExportAll(exportAll);
 
 		final org.eclipse.jgit.transport.Daemon d;
 		d = new org.eclipse.jgit.transport.Daemon(
 				host != null ? new InetSocketAddress(host, port)
 						: new InetSocketAddress(port));
 		d.setPackConfig(packConfig);
 		d.setRepositoryResolver(resolver);
 		if (0 <= timeout)
 			d.setTimeout(timeout);
 
 		for (String n : enable)
 			service(d, n).setEnabled(true);
 		for (String n : disable)
 			service(d, n).setEnabled(false);
 
 		for (String n : canOverride)
 			service(d, n).setOverridable(true);
 		for (String n : forbidOverride)
 			service(d, n).setOverridable(false);
 		if (ketchServerType == KetchServerType.LEADER) {
 			startKetchLeader(d);
 		}
 		d.start();
 		outw.println(MessageFormat.format(CLIText.get().listeningOn, d.getAddress()));
 	}
 
 	private StoredConfig getUserConfig() throws IOException {
 		StoredConfig userConfig = null;
 		try {
 			userConfig = SystemReader.getInstance().getUserConfig();
 		} catch (ConfigInvalidException e) {
 			throw die(e.getMessage());
 		}
 		return userConfig;
 	}
 
 	private static DaemonService service(
 			final org.eclipse.jgit.transport.Daemon d,
 			final String n) {
 		final DaemonService svc = d.getService(n);
 		if (svc == null)
 			throw die(MessageFormat.format(CLIText.get().serviceNotSupported, n));
 		return svc;
 	}
 
 	private void startKetchLeader(org.eclipse.jgit.transport.Daemon daemon) {
 		KetchSystem system = new KetchSystem();
 		final KetchLeaderCacheaderCache.html#KetchLeaderCache">KetchLeaderCache leaders = new KetchLeaderCache(system);
 		final ReceivePackFactory<DaemonClient> factory;
 
 		factory = daemon.getReceivePackFactory();
 		daemon.setReceivePackFactory((DaemonClient req, Repository repo) -> {
 			ReceivePack rp = factory.create(req, repo);
 			KetchLeader leader;
 			try {
 				leader = leaders.get(repo);
 			} catch (URISyntaxException err) {
 				throw new ServiceNotEnabledException(
 						KetchText.get().invalidFollowerUri, err);
 			}
 			rp.setPreReceiveHook(new KetchPreReceive(leader));
 			return rp;
 		});
 	}
 }