17179122983

Committed 23 Aug 2025 07:06PM UTC coverage: 58.488% (+0.004%) from 58.484%

Build # 17179122983

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push

github

Committed by

HebaruSan

Commit Message

Merge #4420 More tests and fixes

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Branch coverage included in aggregate %.

70 of 132 new or added lines in 17 files covered. (53.03%)

446 existing lines in 11 files now uncovered.

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53.39

/Core/GameInstanceManager.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Transactions;
using System.Diagnostics.CodeAnalysis;

using Autofac;
using ChinhDo.Transactions.FileManager;
using log4net;

using CKAN.IO;
using CKAN.Versioning;
using CKAN.Configuration;
using CKAN.Games;
using CKAN.Games.KerbalSpaceProgram;
using CKAN.Games.KerbalSpaceProgram.GameVersionProviders;

namespace CKAN
{
    /// <summary>
    /// Manage multiple game installs.
    /// </summary>
    public class GameInstanceManager : IDisposable
    {
        /// <summary>
        /// An IUser object for user interaction.
        /// It is initialized during the startup with a ConsoleUser,
        /// do not use in functions that could be called by the GUI.
        /// </summary>
        public IUser          User            { get; set; }
        public IConfiguration Configuration   { get; set; }
        public GameInstance?  CurrentInstance { get; private set; }
        public event Action<GameInstance?, GameInstance?>? InstanceChanged;

        public NetModuleCache? Cache { get; private set; }
        public event Action<NetModuleCache>? CacheChanged;

        public  SteamLibrary  SteamLibrary => steamLib ??= new SteamLibrary();
        private SteamLibrary? steamLib;

        private static readonly ILog log = LogManager.GetLogger(typeof (GameInstanceManager));

        private readonly SortedList<string, GameInstance> instances = new SortedList<string, GameInstance>();

        public string[] AllInstanceAnchorFiles => KnownGames.knownGames
                                                            .SelectMany(g => g.InstanceAnchorFiles)
                                                            .Distinct()
                                                            .ToArray();

        public string? AutoStartInstance
        {
            get => Configuration.AutoStartInstance != null
                   && HasInstance(Configuration.AutoStartInstance)
                       ? Configuration.AutoStartInstance
                       : null;

            private set
            {
                if (value != null && !string.IsNullOrEmpty(value) && !HasInstance(value))
                {
                    throw new InvalidGameInstanceKraken(value);
                }
                Configuration.AutoStartInstance = value;
            }
        }

        public SortedList<string, GameInstance> Instances => new SortedList<string, GameInstance>(instances);

        public GameInstanceManager(IUser user, IConfiguration configuration)
        {
            User = user;
            Configuration = configuration;
            LoadInstances();
            LoadCacheSettings();
        }

        /// <summary>
        /// Returns the preferred game instance, or null if none can be found.
        ///
        /// This works by checking to see if we're in a game dir first, then the
        /// config for an autostart instance, then will try to auto-populate
        /// by scanning for the game.
        ///
        /// This *will not* touch the config if we find a portable install.
        ///
        /// This *will* run game instance autodetection if the config is empty.
        ///
        /// This *will* set the current instance, or throw an exception if it's already set.
        ///
        /// Returns null if we have multiple instances, but none of them are preferred.
        /// </summary>
        public GameInstance? GetPreferredInstance()
            => CurrentInstance ??= _GetPreferredInstance();

        private GameInstance? _GetPreferredInstance()
        {
            // First check if we're part of a portable install
            // Note that this *does not* register in the config.
            switch (KnownGames.knownGames.Select(g => GameInstance.PortableDir(g)
                                                      is string p
                                                          ? new GameInstance(g, p,
                                                                             Properties.Resources.GameInstanceManagerPortable,
                                                                             User)
                                                          : null)
                                         .OfType<GameInstance>()
                                         .Where(i => i.Valid)
                                         .ToArray())
            {
                case { Length: 1 } insts:
                    return insts.Single();

                case { Length: > 1 } insts:
                    if (User.RaiseSelectionDialog(
                            string.Format(Properties.Resources.GameInstanceManagerSelectGamePrompt,
                                          string.Join(", ", insts.Select(i => i.GameDir())
                                                                 .Distinct()
                                                                 .Select(Platform.FormatPath))),
                            insts.Select(i => i.game.ShortName)
                                 .ToArray())
                        is int selection and >= 0)
                    {
                        return insts[selection];
                    }
                    break;
            }

            // If we only know of a single instance, return that.
            if (instances.Count == 1
                && instances.Values.Single() is { Valid: true } and var inst)
            {
                return inst;
            }

            // Return the autostart, if we can find it.
            // We check both null and "" as we can't write NULL to the config, so we write an empty string instead
            // This is necessary so we can indicate that the user wants to reset the current AutoStartInstance without clearing the config!
            if (AutoStartInstance is { Length: > 0 }
                && instances.TryGetValue(AutoStartInstance, out GameInstance? autoInst)
                && autoInst.Valid)
            {
                return autoInst;
            }

            // If we know of no instances, try to find one.
            // Otherwise, we know of too many instances!
            // We don't know which one to pick, so we return null.
            return instances.Count == 0 ? FindAndRegisterDefaultInstances() : null;
        }

        /// <summary>
        /// Find and register default instances by running
        /// game autodetection code. Registers one per known game,
        /// uses first found as default.
        ///
        /// Returns the resulting game instance if found.
        /// </summary>
        public GameInstance? FindAndRegisterDefaultInstances()
        {
            if (instances.Count != 0)
            {
                throw new GameManagerKraken("Attempted to scan for defaults with instances");
            }
            var found = FindDefaultInstances();
            foreach (var inst in found)
            {
                log.DebugFormat("Registering {0} at {1}...",
                                inst.Name, inst.GameDir());
                AddInstance(inst);
            }
            return found.FirstOrDefault();
        }

        public GameInstance[] FindDefaultInstances()
        {
            var found = KnownGames.knownGames.SelectMany(g =>
                            SteamLibrary.Games
                                        .Select(sg => sg.Name is string name && sg.GameDir is DirectoryInfo dir
                                                          ? new Tuple<string, DirectoryInfo>(name, dir)
                                                          : null)
                                        .Append(g.MacPath() is DirectoryInfo dir
                                                    ? new Tuple<string, DirectoryInfo>(
                                                        string.Format(Properties.Resources.GameInstanceManagerAuto,
                                                                      g.ShortName),
                                                        dir)
                                                    : null)
                                        .OfType<Tuple<string, DirectoryInfo>>()
                                        .Select(tuple => tuple.Item1 != null && g.GameInFolder(tuple.Item2)
                                                       ? new GameInstance(g, tuple.Item2.FullName,
                                                                          tuple.Item1 ?? g.ShortName, User)
                                                       : null)
                                        .OfType<GameInstance>())
                                  .Where(inst => inst.Valid)
                                  .ToArray();
            foreach (var group in found.GroupBy(inst => inst.Name))
            {
                if (group.Count() > 1)
                {
                    // Make sure the names are unique
                    int index = 0;
                    foreach (var inst in group)
                    {
                        // Find an unused name
                        string name;
                        do
                        {
                            ++index;
                            name = $"{group.Key} ({++index})";
                        }
                        while (found.Any(other => other.Name == name));
                        inst.Name = name;
                    }
                }
            }
            return found;
        }

        /// <summary>
        /// Adds a game instance to config.
        /// </summary>
        /// <returns>The resulting GameInstance object</returns>
        /// <exception cref="NotGameDirKraken">Thrown if the instance is not a valid game instance.</exception>
        public GameInstance AddInstance(GameInstance instance)
        {
            if (instance.Valid)
            {
                string name = instance.Name;
                instances.Add(name, instance);
                Configuration.SetRegistryToInstances(instances);
            }
            else
            {
                throw new NotGameDirKraken(instance.GameDir());
            }
            return instance;
        }

        /// <summary>
        /// Adds a game instance to config.
        /// </summary>
        /// <param name="path">The path of the instance</param>
        /// <param name="name">The name of the instance</param>
        /// <param name="user">IUser object for interaction</param>
        /// <returns>The resulting GameInstance object</returns>
        /// <exception cref="NotGameDirKraken">Thrown if the instance is not a valid game instance.</exception>
        public GameInstance? AddInstance(string path, string name, IUser user)
        {
            var game = DetermineGame(new DirectoryInfo(path), user);
            return game == null ? null : AddInstance(new GameInstance(game, path, name, user));
        }

        /// <summary>
        /// Clones an existing game installation.
        /// </summary>
        /// <param name="existingInstance">The game instance to clone.</param>
        /// <param name="newName">The name for the new instance.</param>
        /// <param name="newPath">The path where the new instance should be located.</param>
        /// <param name="shareStockFolders">True to make junctions or symlinks to stock folders instead of copying</param>
        /// <exception cref="InstanceNameTakenKraken">Thrown if the instance name is already in use.</exception>
        /// <exception cref="NotGameDirKraken">Thrown by AddInstance() if created instance is not valid, e.g. if something went wrong with copying.</exception>
        /// <exception cref="DirectoryNotFoundKraken">Thrown by CopyDirectory() if directory doesn't exist. Should never be thrown here.</exception>
        /// <exception cref="PathErrorKraken">Thrown by CopyDirectory() if the target folder already exists and is not empty.</exception>
        /// <exception cref="IOException">Thrown by CopyDirectory() if something goes wrong during the process.</exception>
        public void CloneInstance(GameInstance existingInstance,
                                  string       newName,
                                  string       newPath,
                                  bool         shareStockFolders = false)
        {
            CloneInstance(existingInstance, newName, newPath,
                          existingInstance.game.LeaveEmptyInClones,
                          shareStockFolders);
        }

        /// <summary>
        /// Clones an existing game installation.
        /// </summary>
        /// <param name="existingInstance">The game instance to clone.</param>
        /// <param name="newName">The name for the new instance.</param>
        /// <param name="newPath">The path where the new instance should be located.</param>
        /// <param name="leaveEmpty">Dirs whose contents should not be copied</param>
        /// <param name="shareStockFolders">True to make junctions or symlinks to stock folders instead of copying</param>
        /// <exception cref="InstanceNameTakenKraken">Thrown if the instance name is already in use.</exception>
        /// <exception cref="NotGameDirKraken">Thrown by AddInstance() if created instance is not valid, e.g. if something went wrong with copying.</exception>
        /// <exception cref="DirectoryNotFoundKraken">Thrown by CopyDirectory() if directory doesn't exist. Should never be thrown here.</exception>
        /// <exception cref="PathErrorKraken">Thrown by CopyDirectory() if the target folder already exists and is not empty.</exception>
        /// <exception cref="IOException">Thrown by CopyDirectory() if something goes wrong during the process.</exception>
        public void CloneInstance(GameInstance existingInstance,
                                  string       newName,
                                  string       newPath,
                                  string[]     leaveEmpty,
                                  bool         shareStockFolders = false)
        {
            if (HasInstance(newName))
            {
                throw new InstanceNameTakenKraken(newName);
            }
            if (!existingInstance.Valid)
            {
                throw new NotGameDirKraken(existingInstance.GameDir(), string.Format(
                    Properties.Resources.GameInstanceCloneInvalid, existingInstance.game.ShortName));
            }

            log.Debug("Copying directory.");
            Utilities.CopyDirectory(existingInstance.GameDir(), newPath,
                                    shareStockFolders ? existingInstance.game.StockFolders
                                                      : Array.Empty<string>(),
                                    leaveEmpty);

            // Add the new instance to the config
            AddInstance(new GameInstance(existingInstance.game, newPath, newName, User));
        }

        /// <summary>
        /// Create a new fake game instance
        /// </summary>
        /// <param name="game">The game of the new instance.</param>
        /// <param name="newName">The name for the new instance.</param>
        /// <param name="newPath">The location of the new instance.</param>
        /// <param name="version">The version of the new instance. Should have a build number.</param>
        /// <param name="dlcs">The IDlcDetector implementations for the DLCs that should be faked and the requested dlc version as a dictionary.</param>
        /// <exception cref="InstanceNameTakenKraken">Thrown if the instance name is already in use.</exception>
        /// <exception cref="NotGameDirKraken">Thrown by AddInstance() if created instance is not valid, e.g. if a write operation didn't complete for whatever reason.</exception>
        public void FakeInstance(IGame game, string newName, string newPath, GameVersion version,
                                 Dictionary<DLC.IDlcDetector, GameVersion>? dlcs = null)
        {
            TxFileManager fileMgr = new TxFileManager();
            using (TransactionScope transaction = CkanTransaction.CreateTransactionScope())
            {
                if (HasInstance(newName))
                {
                    throw new InstanceNameTakenKraken(newName);
                }

                if (!version.InBuildMap(game))
                {
                    throw new BadGameVersionKraken(string.Format(
                        Properties.Resources.GameInstanceFakeBadVersion, game.ShortName, version));
                }
                if (Directory.Exists(newPath) && (Directory.GetFiles(newPath).Length != 0 || Directory.GetDirectories(newPath).Length != 0))
                {
                    throw new BadInstallLocationKraken(Properties.Resources.GameInstanceFakeNotEmpty);
                }

                log.DebugFormat("Creating folder structure and text files at {0} for {1} version {2}", Path.GetFullPath(newPath), game.ShortName, version.ToString());

                // Create a game root directory, containing a GameData folder, a buildID.txt/buildID64.txt and a readme.txt
                fileMgr.CreateDirectory(newPath);
                fileMgr.CreateDirectory(Path.Combine(newPath, game.PrimaryModDirectoryRelative));
                game.RebuildSubdirectories(newPath);

                foreach (var anchor in game.InstanceAnchorFiles)
                {
                    fileMgr.WriteAllText(Path.Combine(newPath, anchor),
                                         version.WithoutBuild.ToString());
                }

                // Don't write the buildID.txts if we have no build, otherwise it would be -1.
                if (version.IsBuildDefined && game is KerbalSpaceProgram)
                {
                    foreach (var b in KspBuildIdVersionProvider.buildIDfilenames)
                    {
                        fileMgr.WriteAllText(Path.Combine(newPath, b),
                                             string.Format("build id = {0}", version.Build));
                    }
                }

                // Create the readme.txt WITHOUT build number
                fileMgr.WriteAllText(Path.Combine(newPath, "readme.txt"),
                                     string.Format("Version {0}",
                                                   version.WithoutBuild.ToString()));

                // Create the needed folder structure and the readme.txt for DLCs that should be simulated.
                if (dlcs != null)
                {
                    foreach (KeyValuePair<DLC.IDlcDetector, GameVersion> dlc in dlcs)
                    {
                        DLC.IDlcDetector dlcDetector = dlc.Key;
                        GameVersion dlcVersion = dlc.Value;

                        if (!dlcDetector.AllowedOnBaseVersion(version))
                        {
                            throw new WrongGameVersionKraken(
                                version,
                                string.Format(Properties.Resources.GameInstanceFakeDLCNotAllowed,
                                    game.ShortName,
                                    dlcDetector.ReleaseGameVersion,
                                    dlcDetector.IdentifierBaseName));
                        }

                        string dlcDir = Path.Combine(newPath, dlcDetector.InstallPath());
                        fileMgr.CreateDirectory(dlcDir);
                        fileMgr.WriteAllText(
                            Path.Combine(dlcDir, "readme.txt"),
                            string.Format("Version {0}", dlcVersion));
                    }
                }

                // Add the new instance to the config
                GameInstance new_instance = new GameInstance(game, newPath, newName, User);
                AddInstance(new_instance);
                transaction.Complete();
            }
        }

        /// <summary>
        /// Given a string returns a unused valid instance name by postfixing the string
        /// </summary>
        /// <returns> A unused valid instance name.</returns>
        /// <param name="name">The name to use as a base.</param>
        /// <exception cref="Kraken">Could not find a valid name.</exception>
        public string GetNextValidInstanceName(string name)
        {
            // Check if the current name is valid
            if (InstanceNameIsValid(name))
            {
                return name;
            }

            // Try appending a number to the name
            var validName = Enumerable.Repeat(name, 1000)
                .Select((s, i) => s + " (" + i + ")")
                .FirstOrDefault(InstanceNameIsValid);
            if (validName != null)
            {
                return validName;
            }

            // Check if a name with the current timestamp is valid
            validName = name + " (" + DateTime.Now + ")";

            if (InstanceNameIsValid(validName))
            {
                return validName;
            }

            // Give up
            throw new Kraken(Properties.Resources.GameInstanceNoValidName);
        }

        /// <summary>
        /// Check if the instance name is valid.
        /// </summary>
        /// <returns><c>true</c>, if name is valid, <c>false</c> otherwise.</returns>
        /// <param name="name">Name to check.</param>
        private bool InstanceNameIsValid(string name)
        {
            // Discard null, empty strings and white space only strings.
            // Look for the current name in the list of loaded instances.
            return !string.IsNullOrWhiteSpace(name) && !HasInstance(name);
        }

        /// <summary>
        /// Removes the instance from the config and saves.
        /// </summary>
        public void RemoveInstance(string name)
        {
            instances.Remove(name);
            Configuration.SetRegistryToInstances(instances);
        }

        /// <summary>
        /// Renames an instance in the config and saves.
        /// </summary>
        public void RenameInstance(string from, string to)
        {
            if (from != to)
            {
                if (instances.ContainsKey(to))
                {
                    throw new InstanceNameTakenKraken(to);
                }
                var inst = instances[from];
                instances.Remove(from);
                inst.Name = to;
                instances.Add(to, inst);
                Configuration.SetRegistryToInstances(instances);
            }
        }

        /// <summary>
        /// Sets the current instance.
        /// Throws an InvalidGameInstanceKraken if not found.
        /// </summary>
        public void SetCurrentInstance(string name)
        {
            if (!instances.TryGetValue(name, out GameInstance? inst))
            {
                throw new InvalidGameInstanceKraken(name);
            }
            else if (!inst.Valid)
            {
                throw new NotGameDirKraken(inst.GameDir());
            }
            else
            {
                SetCurrentInstance(inst);
            }
        }

        public void SetCurrentInstance(GameInstance? instance)
        {
            var prev = CurrentInstance;
            // Don't try to Dispose a null CurrentInstance.
            if (prev != null && !prev.Equals(instance))
            {
                // Dispose of the old registry manager to release the registry
                // (without accidentally locking/loading/etc it).
                RegistryManager.DisposeInstance(prev);
            }
            CurrentInstance = instance;
            InstanceChanged?.Invoke(prev, instance);
        }

        public void SetCurrentInstanceByPath(string path)
        {
            if (InstanceAt(path) is GameInstance inst)
            {
                SetCurrentInstance(inst);
            }
        }

        public GameInstance? InstanceAt(string path)
        {
            var di = new DirectoryInfo(path);
            if (DetermineGame(di, User) is IGame game)
            {
                var inst = new GameInstance(game, path,
                                            Properties.Resources.GameInstanceByPathName,
                                            User);
                if (inst.Valid)
                {
                    return inst;
                }
                else
                {
                    throw new NotGameDirKraken(inst.GameDir());
                }
            }
            return null;
        }

        /// <summary>
        /// Sets the autostart instance in the config and saves it.
        /// </summary>
        public void SetAutoStart(string name)
        {
            if (!HasInstance(name))
            {
                throw new InvalidGameInstanceKraken(name);
            }
            else if (!instances[name].Valid)
            {
                throw new NotGameDirKraken(instances[name].GameDir());
            }
            AutoStartInstance = name;
        }

        public bool HasInstance(string name)
            => instances.ContainsKey(name);

        public void ClearAutoStart()
        {
            Configuration.AutoStartInstance = null;
        }

        private void LoadInstances()
        {
            log.Info("Loading game instances");

            instances.Clear();

            foreach (Tuple<string, string, string> instance in Configuration.GetInstances())
            {
                var name = instance.Item1;
                var path = instance.Item2;
                var gameName = instance.Item3;
                try
                {
                    var game = KnownGames.knownGames.FirstOrDefault(g => g.ShortName == gameName)
                        ?? KnownGames.knownGames.First();
                    log.DebugFormat("Loading {0} from {1}", name, path);
                    // Add unconditionally, sort out invalid instances downstream
                    instances.Add(name, new GameInstance(game, path, name, User));
                }
                catch (Exception exc)
                {
                    // Skip malformed instances (e.g. empty path)
                    log.Error($"Failed to load game instance with name=\"{name}\" path=\"{path}\" game=\"{gameName}\"",
                        exc);
                }
            }
        }

        private void LoadCacheSettings()
        {
            if (Configuration.DownloadCacheDir != null
                && !Directory.Exists(Configuration.DownloadCacheDir))
            {
                try
                {
                    Directory.CreateDirectory(Configuration.DownloadCacheDir);
                }
                catch
                {
                    // Can't create the configured directory, try reverting it to the default
                    Configuration.DownloadCacheDir = null;
                    Directory.CreateDirectory(DefaultDownloadCacheDir);
                }
            }

            var progress = new ProgressImmediate<int>(p => {});
            if (!TrySetupCache(Configuration.DownloadCacheDir,
                               progress,
                               out string? failReason)
                && Configuration.DownloadCacheDir is { Length: > 0 })
            {
                log.ErrorFormat("Cache not found at configured path {0}: {1}",
                                Configuration.DownloadCacheDir, failReason ?? "");
                // Fall back to default path to minimize chance of ending up in an invalid state at startup
                TrySetupCache(null, progress, out _);
            }
        }

        /// <summary>
        /// Switch to using a download cache in a new location
        /// </summary>
        /// <param name="path">Location of folder for new cache</param>
        /// <param name="progress">Progress object to report progress to</param>
        /// <param name="failureReason">Contains a human readable failure message if the setup failed</param>
        /// <returns>
        /// true if successful, false otherwise
        /// </returns>
        public bool TrySetupCache(string?        path,
                                  IProgress<int> progress,
                                  [NotNullWhen(returnValue: false)]
                                  out string?    failureReason)
        {
            var origPath  = Configuration.DownloadCacheDir;
            var origCache = Cache;
            try
            {
                if (path is { Length: > 0 })
                {
                    Cache = new NetModuleCache(this, path);
                    if (path != origPath)
                    {
                        Configuration.DownloadCacheDir = path;
                    }
                }
                else
                {
                    Directory.CreateDirectory(DefaultDownloadCacheDir);
                    Cache = new NetModuleCache(this, DefaultDownloadCacheDir);
                    Configuration.DownloadCacheDir = null;
                }
                if (origPath != null && origCache != null && path != origPath)
                {
                    origCache.GetSizeInfo(out _, out long oldNumBytes, out _);
                    Cache.GetSizeInfo(out _, out _, out long? bytesFree);

                    if (oldNumBytes > 0)
                    {
                        switch (User.RaiseSelectionDialog(
                                    bytesFree.HasValue
                                        ? string.Format(Properties.Resources.GameInstanceManagerCacheMigrationPrompt,
                                                        CkanModule.FmtSize(oldNumBytes),
                                                        CkanModule.FmtSize(bytesFree.Value))
                                        : string.Format(Properties.Resources.GameInstanceManagerCacheMigrationPromptFreeSpaceUnknown,
                                                        CkanModule.FmtSize(oldNumBytes)),
                                    oldNumBytes < (bytesFree ?? 0) ? 0 : 2,
                                    Properties.Resources.GameInstanceManagerCacheMigrationMove,
                                    Properties.Resources.GameInstanceManagerCacheMigrationDelete,
                                    Properties.Resources.GameInstanceManagerCacheMigrationOpen,
                                    Properties.Resources.GameInstanceManagerCacheMigrationNothing,
                                    Properties.Resources.GameInstanceManagerCacheMigrationRevert))
                        {
                            case 0:
                                if (oldNumBytes < bytesFree)
                                {
                                    Cache.MoveFrom(new DirectoryInfo(origPath), progress);
                                    CacheChanged?.Invoke(origCache);
                                    origCache.Dispose();
                                }
                                else
                                {
                                    User.RaiseError(Properties.Resources.GameInstanceManagerCacheMigrationNotEnoughFreeSpace);
                                    // Abort since the user picked an option that doesn't work
                                    Cache = origCache;
                                    Configuration.DownloadCacheDir = origPath;
                                    failureReason = "";
                                }
                                break;

                            case 1:
                                origCache.RemoveAll();
                                CacheChanged?.Invoke(origCache);
                                origCache.Dispose();
                                break;

                            case 2:
                                Utilities.OpenFileBrowser(origPath);
                                Utilities.OpenFileBrowser(Configuration.DownloadCacheDir ?? DefaultDownloadCacheDir);
                                CacheChanged?.Invoke(origCache);
                                origCache.Dispose();
                                break;

                            case 3:
                                CacheChanged?.Invoke(origCache);
                                origCache.Dispose();
                                break;

                            case -1:
                            case 4:
                                Cache = origCache;
                                Configuration.DownloadCacheDir = origPath;
                                failureReason = "";
                                return false;
                        }
                    }
                    else
                    {
                        CacheChanged?.Invoke(origCache);
                        origCache.Dispose();
                    }
                }
                failureReason = null;
                return true;
            }
            catch (DirectoryNotFoundKraken)
            {
                Cache = origCache;
                Configuration.DownloadCacheDir = origPath;
                failureReason = string.Format(Properties.Resources.GameInstancePathNotFound, path);
                return false;
            }
            catch (Exception ex)
            {
                Cache = origCache;
                Configuration.DownloadCacheDir = origPath;
                failureReason = ex.Message;
                return false;
            }
        }

        /// <summary>
        /// Releases all resource used by the <see cref="GameInstance"/> object.
        /// </summary>
        /// <remarks>Call <see cref="Dispose"/> when you are finished using the <see cref="GameInstance"/>. The <see cref="Dispose"/>
        /// method leaves the <see cref="GameInstance"/> in an unusable state. After calling <see cref="Dispose"/>, you must
        /// release all references to the <see cref="GameInstance"/> so the garbage collector can reclaim the memory that
        /// the <see cref="GameInstance"/> was occupying.</remarks>
        public void Dispose()
        {
            Cache?.Dispose();
            Cache = null;

            // Attempting to dispose of the related RegistryManager object here is a bad idea, it cause loads of failures
            GC.SuppressFinalize(this);
        }

        public static bool IsGameInstanceDir(DirectoryInfo path)
            => KnownGames.knownGames.Any(g => g.GameInFolder(path));

        /// <summary>
        /// Tries to determine the game that is installed at the given path
        /// </summary>
        /// <param name="path">A DirectoryInfo of the path to check</param>
        /// <param name="user">IUser object for interaction</param>
        /// <returns>An instance of the matching game or null if the user cancelled</returns>
        /// <exception cref="NotGameDirKraken">Thrown when no games found</exception>
        public IGame? DetermineGame(DirectoryInfo path, IUser user)
            => KnownGames.knownGames.Where(g => g.GameInFolder(path))
                                    .ToArray()
               switch
               {
                   { Length: 0 }       => throw new NotGameDirKraken(path.FullName),
                   { Length: 1 } games => games.Single(),
                   var games => user.RaiseSelectionDialog(
                                    string.Format(Properties.Resources.GameInstanceManagerSelectGamePrompt,
                                                  Platform.FormatPath(path.FullName)),
                                    games.Select(g => g.ShortName)
                                         .ToArray())
                                is int selection and >= 0
                                    ? games[selection]
                                    : null
               };

        public static readonly string DefaultDownloadCacheDir =
            Path.Combine(CKANPathUtils.AppDataPath, "downloads");
    }
}

KSP-CKAN / CKAN / 17179122983

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