Templates

SzCore/DataObjects/ISzTemplate.cs

@@ -0,0 +1,10 @@
+namespace SzCore.DataObjects;
+
+public interface ISzTemplate
+{
+    public string Name { get; set; }
+    public string Id { get; set; }
+    public Guid Uuid { get; set; }
+    public string Description { get; set; }
+    public Dictionary<string, SzTemplateField> TemplateFields { get; set; }
+}

SzCore/DataObjects/SzDataObjectTemplate.cs

@@ -1,10 +1,12 @@
 namespace SzCore.DataObjects;
 
-public class SzDataObjectTemplate
+public class SzDataObjectTemplate : ISzTemplate
 {
     public required string Name {get; set;}
     public required string Id {get; set;}
-    public Guid? Uuid {get; set;}
-    public required string DataObjectType {get; set;}
+    public Guid Uuid {get; set;}
+    public string Description { get; set; } = "";
     public Dictionary<string, SzTemplateField> TemplateFields {get; set;} = [];
+    
+    public required string DataObjectType {get; set;}
 }

SzCore/SzDataHandler.cs

@@ -1,3 +1,4 @@
+using System.ComponentModel.Design;
 using SzCore.DataObjects;
 
 namespace SzCore;
@@ -5,6 +6,7 @@ namespace SzCore;
 public class SzDataHandler
 {
     private Dictionary<string, SzDataset> _loadedDatasets = [];
+    private Dictionary<string, ISzTemplate> _loadedTemplates = [];
 
     public SzDataHandler(){}
 
@@ -26,7 +28,7 @@ public class SzDataHandler
     {
         if (_loadedDatasets.TryGetValue(datasetId, out SzDataset? value))
         {
-            if (value is not null) return value;
+            return value;
         }
 
         var datasetPath = Path.Combine(SZ.LocalFileManager.DataPath, "datasets", datasetId, "dataset.json");
@@ -49,19 +51,62 @@ public class SzDataHandler
         return parsedDataset;
     }
 
-    // The client should periodically call this to free memory, probably
-    private void ClearLoadedDatasets()
+    public bool SaveTemplate(ISzTemplate template)
     {
-        _loadedDatasets.Clear();
+        var templatePath = Path.Combine(SZ.LocalFileManager.TemplatesPath, template.Id, "template.json");
+        try
+        {
+            return SZ.LocalFileManager.SaveFile(templatePath, SZ.SzParser.SerializeTemplateToJson(template));
+        }
+        catch (Exception e)
+        {
+            SZ.Logger.LogError("Error saving template: " + e.Message);
+            return false;
+        }
     }
 
-    // Only use this for test purposes, we probably don't want to load all datasets to memory in production
+    public T? LoadTemplate<T>(string templateId) where T : ISzTemplate
+    {
+        if (_loadedTemplates.TryGetValue(templateId, out ISzTemplate? existing))
+        {
+            return (T)existing;
+        }
+
+        var templatePah = Path.Combine(SZ.LocalFileManager.TemplatesPath, templateId, "template.json");
+        
+        var json = SZ.LocalFileManager.LoadFile(templatePah);
+        if (json is null) 
+        {
+            SZ.Logger.LogWarning($"Could not load tetmplate with ID '{templateId}'");
+            return default;  
+        }
+
+        var parsedTemplate = SZ.SzParser.DeserializeTemplate<T>(json);
+        if (parsedTemplate is null)
+        {
+            SZ.Logger.LogWarning($"Could not load template with ID '{templateId}'");
+            return default;  
+        }
+
+        _loadedTemplates.TryAdd(parsedTemplate.Id, parsedTemplate);
+
+        return parsedTemplate;
+    }
+
+    // The client should periodically call this to free memory, probably
+    private void ClearCache()
+    {
+        _loadedDatasets.Clear();
+        _loadedTemplates.Clear();
+    }
+
+    // Only use these two methods for test purposes, we probably don't want to load all datasets and templates to memory in production
     private void LoadAllDatasets()
     {
-        ClearLoadedDatasets();
+        _loadedDatasets.Clear();
         if (!Directory.Exists(SZ.LocalFileManager.DatasetsPath))
         {
-            throw new Exception("Could not load datasets, the datase directory does not exist.");
+            throw new Exception("Could not load datasets, the dataset directory does not exist.");
         }
 
         foreach (var dir in Directory.GetDirectories(SZ.LocalFileManager.DatasetsPath))
@@ -82,4 +127,31 @@ public class SzDataHandler
             _loadedDatasets.Add(parsedDataset.Id, parsedDataset);
         }
     }
+
+    private void LoadAllTemplates()
+    {
+        _loadedTemplates.Clear();
+        if (!Directory.Exists(SZ.LocalFileManager.TemplatesPath))
+        {
+            throw new Exception("Could not load templates, the template directory does not exist.");
+        }
+
+        foreach (var dir in Directory.GetDirectories(SZ.LocalFileManager.TemplatesPath))
+        {
+            var templateFilePath = Path.Combine(dir, "template.json");
+            if (!File.Exists(templateFilePath)) continue;
+
+            var templateJson = SZ.LocalFileManager.LoadFile(templateFilePath);
+            if (templateJson == null) continue;
+
+            var parsedTemplate = SZ.SzParser.DeserializeTemplate<ISzTemplate>(templateJson);
+            if (parsedTemplate == null)
+            {
+                SZ.Logger.LogWarning($"Parse error: Could not parse file {templateFilePath} as an ISzTemplate");
+                continue;
+            }
+
+            _loadedTemplates.Add(parsedTemplate.Id, parsedTemplate);
+        }
+    }
 }

SzCore/SzParser.cs

@@ -17,7 +17,7 @@ public class SzParser
         }
         catch (JsonException e)
         {
-            throw new Exception("Parse Error: " + e.Message);
+            throw new Exception("Dataset Serialization Error: " + e.Message);
         }
     }
 
@@ -34,5 +34,33 @@ public class SzParser
             return null;
         }
     }
+
+    public string SerializeTemplateToJson(ISzTemplate template)
+    {
+        try 
+        {
+            var templateType = template.GetType();
+            var jsonString = JsonSerializer.Serialize(template, templateType, _jsonOptions);
+            return jsonString;
+        }
+        catch (Exception e)
+        {
+            throw new Exception("Template Serialization Error: " + e.Message);
+        }
+    }
+
+    public T? DeserializeTemplate<T>(string jsonString)
+    {
+        try 
+        {
+            var result = JsonSerializer.Deserialize<T>(jsonString, _jsonOptions);
+            return result;
+        }
+        catch (Exception e)
+        {
+            SZ.Logger.LogError($"Could not deserialize JSON to type {typeof(T)}: " + e.Message);
+            return default;
+        }
+    }
 }