cell histogram

Plugins/LindtLeerformPlugin/Services/LeerformRecipeStore.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+using LindtLeerformPlugin.Models;
+using OpenCvSharp;
+
+namespace LindtLeerformPlugin.Services;
+
+public class LeerformRecipeStore
+{
+    private const string RecipeExtension = ".jleerform";
+
+    public string RecipesDirectory { get; } = Path.Combine("..", "Data", "Recipes");
+
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNameCaseInsensitive = true,
+        WriteIndented = true,
+        Converters = { new JsonStringEnumConverter() }
+    };
+
+    public IReadOnlyList<string> ListRecipeNames()
+    {
+        if (!Directory.Exists(RecipesDirectory))
+            return Array.Empty<string>();
+
+        return Directory.GetFiles(RecipesDirectory, "*" + RecipeExtension)
+            .Select(Path.GetFileNameWithoutExtension)
+            .Where(name => !string.IsNullOrEmpty(name))
+            .Select(name => name!)
+            .OrderBy(name => name, StringComparer.OrdinalIgnoreCase)
+            .ToList();
+    }
+
+    public LeerformRecipe? Load(string recipeName)
+    {
+        if (string.IsNullOrWhiteSpace(recipeName))
+            return null;
+
+        var path = GetRecipePath(recipeName);
+        if (!File.Exists(path))
+            return null;
+
+        var json = File.ReadAllText(path);
+        return JsonSerializer.Deserialize<LeerformRecipe>(json, JsonOptions);
+    }
+
+    public void Save(LeerformRecipe recipe)
+    {
+        if (string.IsNullOrWhiteSpace(recipe.RecipeName))
+            throw new ArgumentException("Recipe must have a name", nameof(recipe));
+
+        Directory.CreateDirectory(RecipesDirectory);
+        var path = GetRecipePath(recipe.RecipeName);
+        var json = JsonSerializer.Serialize(recipe, JsonOptions);
+        File.WriteAllText(path, json);
+    }
+
+    public static Mat? DecodeThumbnail(LeerformRecipe recipe)
+    {
+        if (string.IsNullOrEmpty(recipe.ThumbnailBase64))
+            return null;
+
+        try
+        {
+            var bytes = Convert.FromBase64String(recipe.ThumbnailBase64);
+            var mat = Cv2.ImDecode(bytes, ImreadModes.Color);
+            return mat.Empty() ? null : mat;
+        }
+        catch
+        {
+            return null;
+        }
+    }
+
+    private string GetRecipePath(string recipeName) =>
+        Path.Combine(RecipesDirectory, recipeName + RecipeExtension);
+}