private void CopyCategoryImages(string techOutputDir)
        {
            var categoryDir = Path.Combine(techOutputDir, "categories");

            Directory.CreateDirectory(categoryDir);

            var helpers = StellarisDirectoryHelper
                          .CreateCombinedList(StellarisDirectoryHelper, modDirectoryHelpers);

            foreach (var helper in helpers)
            {
                List <FileInfo> categoryFiles = new List <FileInfo>();
                var             catPath       = Path.Combine(helper.Technology, "category");
                if (Directory.Exists(catPath))
                {
                    List <FileInfo> findFilesInDirectoryTree = DirectoryWalker.FindFilesInDirectoryTree(catPath, StellarisDirectoryHelper.TextMask);
                    Log.Logger.Debug("{helper} has categories files: {modFiles}", helper.ModName, findFilesInDirectoryTree.Select(x => x.Name));
                    categoryFiles.AddRange(findFilesInDirectoryTree);
                }
                else
                {
                    Log.Logger.Debug("{helper} has no tech categories folder", helper.ModName);
                }

                var categoryFileNodes = new CWParserHelper().ParseParadoxFiles(categoryFiles.Select(x => x.FullName).ToList());
                foreach (CWNode fileNode in categoryFileNodes.Values)
                {
                    foreach (var category in fileNode.Nodes)
                    {
                        var catName   = category.Key;
                        var imagePath = category.GetKeyValue("icon") ?? category.Key;

                        ImageOutput.TransformAndOutputImage(Path.Combine(helper.Root, imagePath),
                                                            Path.Combine(categoryDir, catName + ".png"));
                    }
                    ;
                }
            }
        }
        public void Parse(IEnumerable <ParseTarget> parseTargets)
        {
            var techTreeGraphCreator      = new TechTreeGraphCreator(Localisation, CWParser, StellarisDirectoryHelper, ModDirectoryHelpers);
            ModEntityData <Tech> techData = techTreeGraphCreator.CreateTechnologyGraph();

            Log.Logger.Debug("Processed {entityCount} techs with {linkCount} Links", techData.EntityCount, techData.LinkCount);
            // process technolgoies first
            var techImageOutputDir = OutputDirectoryHelper.GetImagesPath(ParseTarget.Technologies.ImagesDirectory());

            if (CopyImages)
            {
                CopyMainImages(techData.AllEntities, ParseTarget.Technologies.ImagesDirectory(),
                               techImageOutputDir);

                // because the image copying only get the most recent version of the entity, make sure that the image flag is set on all
                // relevant for the vanilla graph display
                var currentTechs = techData.AllEntitiesByKey;
                techData.ApplyToChain((techs, links) =>
                {
                    foreach (var tech in techs.Values)
                    {
                        tech.IconFound = currentTechs[tech.Id].IconFound;
                    }
                });

                var techAreas = Enum.GetValues(typeof(TechArea)).Cast <TechArea>();
                var areaDir   = Path.Combine(techImageOutputDir, "areas");

                // tech areas
                Directory.CreateDirectory(areaDir);
                foreach (var techArea in techAreas)
                {
                    var inputPath = Path.Combine(StellarisDirectoryHelper.Icons, "resources", techArea.ToString().ToLowerInvariant() + "_research.dds");
                    // icon to be displayed on the 3 root nodes
                    ImageOutput.TransformAndOutputImage(
                        inputPath,
                        Path.Combine(techImageOutputDir, techArea + "-root.png"));

                    // area icon
                    ImageOutput.TransformAndOutputImage(
                        inputPath,
                        Path.Combine(areaDir, techArea.ToString().ToLowerInvariant() + ".png"));
                }

                // tech categories
                CopyCategoryImages(techImageOutputDir);
            }

            // process dependant objects
            ObjectsDependantOnTechs dependants = null;
            var parseTargetsWithoutTechs       = parseTargets.WithoutTechs().ToList();

            if (parseTargetsWithoutTechs.Any())
            {
                var dependantsGraphCreator = new DependantsGraphCreator(Localisation, CWParser, StellarisDirectoryHelper, ModDirectoryHelpers, techData);
                dependants = dependantsGraphCreator.CreateDependantGraph(parseTargetsWithoutTechs);

                if (CopyImages)
                {
                    foreach (var parseTarget in parseTargetsWithoutTechs)
                    {
                        var imageOutputDir = OutputDirectoryHelper.GetImagesPath(parseTarget.ImagesDirectory());
                        var entityData     = dependants.Get(parseTarget);
                        CopyMainImages(entityData, parseTarget.ImagesDirectory(), imageOutputDir);
                    }
                    dependants.FixImages();
                }
            }

            var visDataMarshaler = new VisDataMarshaler(localisation, OutputDirectoryHelper);
            IDictionary <string, VisData> techVisResults = visDataMarshaler.CreateTechVisData(techData, techImageOutputDir);
            ModEntityData <Tech>          coreGameTech   = techData.FindCoreGameData();

            if (coreGameTech != null)
            {
                IDictionary <string, VisData> techVisData = visDataMarshaler.CreateTechVisData(coreGameTech, techImageOutputDir);
                techVisResults["Stellaris-No-Mods"] = techVisData[StellarisDirectoryHelper.StellarisCoreRootDirectory];
            }
            else
            {
                Log.Logger.Warning("Could not find core game tech files to generate vanilla tree");
            }

            VisData rootNotes = visDataMarshaler.CreateRootNotes(techData, techImageOutputDir);

            techVisResults["Tech-Root-Nodes"] = rootNotes;
            WriteVisData(techVisResults, true);

            if (dependants != null)
            {
                var dependantVisResults = visDataMarshaler.CreateGroupedVisDependantData(techVisResults, dependants, parseTargetsWithoutTechs);
                var coreDependantsOnly  = dependants.CopyOnlyCore();

                // also do a no-mods lookup
                var stellarisNoModsTechVisResult            = techVisResults["Stellaris-No-Mods"];
                IDictionary <string, VisData> visLookupData =
                    stellarisNoModsTechVisResult != null ? new Dictionary <string, VisData>()
                {
                    { "Stellaris-No-Mods", stellarisNoModsTechVisResult }
                } : techVisResults;
                var coreDependantData = visDataMarshaler.CreateGroupedVisDependantData(visLookupData, coreDependantsOnly, parseTargetsWithoutTechs);

                if (coreDependantData.ContainsKey(StellarisDirectoryHelper.StellarisCoreRootDirectory))
                {
                    dependantVisResults["Stellaris-No-Mods"] = coreDependantData[StellarisDirectoryHelper.StellarisCoreRootDirectory];
                }
                else
                {
                    Log.Logger.Warning("Could not find core game dependant files to generate vanilla tree");
                }

                WriteVisData(dependantVisResults, false);
            }
        }