feat(m9/T31): Monaco JSON-schema hover/completion on value-entry surface

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Shared/MonacoEditor.razor

@@ -28,6 +28,16 @@
     [Parameter] public bool ReadOnly { get; set; } = false;
     [Parameter] public bool ShowToolbar { get; set; } = true;
 
+    /// <summary>
+    /// Optional JSON Schema (the resolved schema text — any
+    /// <c>{"$ref":"lib:Name"}</c> already inlined) applied to this editor's
+    /// model when <see cref="Language"/> is <c>json</c>. Wires Monaco's
+    /// built-in JSON language so the editor offers schema-driven hover,
+    /// completion, and diagnostics on the entered JSON. Ignored for non-JSON
+    /// languages. Updating it re-applies the schema to the live model.
+    /// </summary>
+    [Parameter] public string? JsonSchema { get; set; }
+
     /// <summary>
     /// Runtime globals surface the script is analyzed against. Defaults to
     /// template/shared-script globals; set to <c>InboundApi</c> on the API
@@ -87,6 +97,7 @@
     private DotNetObjectReference<MonacoEditor>? _dotNetRef;
     private readonly string _id = Guid.NewGuid().ToString("N");
     private string _lastSentValue = "";
+    private string? _lastSentSchema;
     private bool _initialized;
     private bool _wrap;
     private bool _minimap;
@@ -108,10 +119,12 @@
                     {
                         value = Value ?? "",
                         language = Language,
-                        readOnly = ReadOnly
+                        readOnly = ReadOnly,
+                        jsonSchema = JsonSchema
                     },
                     _dotNetRef);
                 _initialized = true;
+                _lastSentSchema = JsonSchema;
             }
             catch (InvalidOperationException)
             {
@@ -128,10 +141,18 @@
                 Logger.LogError(ex, "Monaco editor {EditorId} failed to initialize.", _id);
             }
         }
-        else if (_initialized && (Value ?? "") != _lastSentValue)
+        else if (_initialized)
         {
-            _lastSentValue = Value ?? "";
+            if ((Value ?? "") != _lastSentValue)
-            await SafeInvokeAsync("MonacoBlazor.setValue", "set editor value", _id, _lastSentValue);
+            {
+                _lastSentValue = Value ?? "";
+                await SafeInvokeAsync("MonacoBlazor.setValue", "set editor value", _id, _lastSentValue);
+            }
+            if (JsonSchema != _lastSentSchema)
+            {
+                _lastSentSchema = JsonSchema;
+                await SafeInvokeAsync("MonacoBlazor.setJsonSchema", "set JSON schema", _id, JsonSchema);
+            }
         }
     }
 

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Shared/ParameterValueForm.razor

@@ -53,6 +53,12 @@ else
     private InboundApiSchema? _rootSchema;
     private string? _parsedFor;
 
+    // The resolved root schema serialized back to a JSON Schema string (with every
+    // {"$ref":"lib:Name"} inlined). Fed to the raw-JSON escape-hatch Monaco editor
+    // so Monaco's built-in JSON language offers schema-driven hover + completion on
+    // the entered JSON. Computed once per parse alongside the resolved schema.
+    private string? _resolvedSchemaJson;
+
     // Raw text and per-field parse/validation errors keyed by canonical PATH
     // (e.g. "order.id", "tags[0]") so nested inputs each carry their own state.
     private readonly Dictionary<string, string> _rawText = new();
@@ -70,6 +76,82 @@ else
         _shapes = ScriptParameterNames.ParseShapes(ParameterDefinitions);
         _rootSchema = await ParseRootAsync();
         _topLevelFields = _rootSchema?.Type == "object" ? _rootSchema.Fields : Array.Empty<InboundApiSchemaField>();
+        _resolvedSchemaJson = _rootSchema is null ? null : ToJsonSchema(_rootSchema);
+    }
+
+    /// <summary>
+    /// Serializes a (resolved) <see cref="InboundApiSchema"/> back to a JSON Schema
+    /// string for the escape-hatch Monaco editor. Any <c>{"$ref":"lib:Name"}</c> the
+    /// parse already inlined is emitted as its resolved shape (no <c>$ref</c> remains),
+    /// so Monaco's JSON language sees the full type. The shape-only / unresolved-ref
+    /// placeholder (Type not in the JSON Schema set) collapses to a permissive
+    /// <c>{}</c> so the editor still validates well-formed JSON without false errors.
+    /// </summary>
+    private static string ToJsonSchema(InboundApiSchema schema)
+    {
+        using var stream = new System.IO.MemoryStream();
+        using (var writer = new System.Text.Json.Utf8JsonWriter(stream))
+        {
+            WriteSchema(writer, schema);
+        }
+
+        return System.Text.Encoding.UTF8.GetString(stream.ToArray());
+    }
+
+    private static void WriteSchema(System.Text.Json.Utf8JsonWriter writer, InboundApiSchema schema)
+    {
+        switch (schema.Type)
+        {
+            case "boolean":
+            case "integer":
+            case "number":
+            case "string":
+                writer.WriteStartObject();
+                writer.WriteString("type", schema.Type);
+                writer.WriteEndObject();
+                break;
+
+            case "object":
+                writer.WriteStartObject();
+                writer.WriteString("type", "object");
+                writer.WritePropertyName("properties");
+                writer.WriteStartObject();
+                foreach (var field in schema.Fields)
+                {
+                    writer.WritePropertyName(field.Name);
+                    WriteSchema(writer, field.Schema);
+                }
+                writer.WriteEndObject();
+                var required = schema.Fields.Where(f => f.Required).Select(f => f.Name).ToList();
+                if (required.Count > 0)
+                {
+                    writer.WritePropertyName("required");
+                    writer.WriteStartArray();
+                    foreach (var name in required)
+                    {
+                        writer.WriteStringValue(name);
+                    }
+                    writer.WriteEndArray();
+                }
+                writer.WriteEndObject();
+                break;
+
+            case "array":
+                writer.WriteStartObject();
+                writer.WriteString("type", "array");
+                if (schema.Items is not null)
+                {
+                    writer.WritePropertyName("items");
+                    WriteSchema(writer, schema.Items);
+                }
+                writer.WriteEndObject();
+                break;
+
+            default: // unresolved $ref / unknown — permissive (accept any JSON).
+                writer.WriteStartObject();
+                writer.WriteEndObject();
+                break;
+        }
     }
 
     /// <summary>
@@ -165,10 +247,13 @@ else
                 @RenderArray(schema, path)
                 break;
 
-            default: // unresolved $ref / unknown — raw-JSON escape hatch.
+            default: // unresolved $ref / unknown — raw-JSON escape hatch (Monaco).
-                <textarea class="form-control form-control-sm font-monospace" rows="3" id="@id"
+                <div class="param-json-editor" data-path="@path">
-                          placeholder='@($"JSON {DisplayType(schema).ToLowerInvariant()}")'
+                    <MonacoEditor Language="json" Height="120px" ShowToolbar="false"
-                          @oninput="e => SetJson(path, (string?)e.Value)">@AsRaw(path)</textarea>
+                                  JsonSchema="@_resolvedSchemaJson"
+                                  Value="@AsRaw(path)"
+                                  ValueChanged="@(v => SetJson(path, v))" />
+                </div>
                 @RenderError(path)
                 break;
         }

src/ZB.MOM.WW.ScadaBridge.CentralUI/wwwroot/js/monaco-init.js

@@ -1,5 +1,5 @@
 // Blazor bridge for Monaco editor.
-// Exposes window.MonacoBlazor with createEditor / setValue / getValue / dispose / setMarkers.
+// Exposes window.MonacoBlazor with createEditor / setValue / getValue / dispose / setMarkers / setJsonSchema.
 // Lazy-loads Monaco's AMD bundle the first time createEditor is called.
 
 (function () {
@@ -285,12 +285,62 @@
         }
     }
 
+    // ---- JSON schema wiring --------------------------------------------------
+
+    // Each json editor gets its own model URI so a schema can be scoped to just
+    // that model via fileMatch — registering it in Monaco's global json defaults
+    // without leaking onto other json editors on the page.
+    function modelUriFor(id) {
+        return monaco.Uri.parse("inmemory://scadabridge/value-" + id + ".json");
+    }
+
+    // Replace (or remove) this editor's entry in the global json schema list,
+    // then push the merged list back into jsonDefaults so Monaco's built-in JSON
+    // language provides schema-driven hover/completion/diagnostics. A null/blank
+    // schema simply drops the entry (the editor falls back to plain json).
+    function applyJsonSchema(id, schemaJson) {
+        if (!monaco.languages.json) return;
+        const uri = modelUriFor(id).toString();
+        const fileMatch = ["value-" + id + ".json"];
+        const defaults = monaco.languages.json.jsonDefaults;
+        const existing = (defaults.diagnosticsOptions && defaults.diagnosticsOptions.schemas) || [];
+        const others = existing.filter(function (s) { return s.uri !== uri; });
+        let schemas = others;
+        if (schemaJson && schemaJson.trim().length > 0) {
+            let parsed = null;
+            try { parsed = JSON.parse(schemaJson); } catch (e) { parsed = null; }
+            if (parsed) {
+                schemas = others.concat([{ uri: uri, fileMatch: fileMatch, schema: parsed }]);
+            }
+        }
+        defaults.setDiagnosticsOptions({
+            validate: true,
+            enableSchemaRequest: false,
+            schemas: schemas
+        });
+    }
+
     async function createEditor(id, host, options, dotNetRef) {
         await ensureLoaded();
         if (!host) return;
+        const language = options.language || "csharp";
+        const isJson = language === "json";
+
+        // A json editor with a schema needs an explicitly-URI'd model so the
+        // schema's fileMatch can target exactly this editor.
+        let model = null;
+        if (isJson) {
+            const uri = modelUriFor(id);
+            model = monaco.editor.getModel(uri);
+            if (model) { model.setValue(options.value || ""); }
+            else { model = monaco.editor.createModel(options.value || "", "json", uri); }
+            if (options.jsonSchema) { applyJsonSchema(id, options.jsonSchema); }
+        }
+
         const editor = monaco.editor.create(host, {
-            value: options.value || "",
+            value: model ? undefined : (options.value || ""),
-            language: options.language || "csharp",
+            model: model || undefined,
+            language: model ? undefined : language,
             theme: "vs",
             minimap: { enabled: false },
             scrollBeyondLastLine: false,
@@ -321,10 +371,16 @@
             dotNetRef.invokeMethodAsync("OnValueChanged", value).catch(function () {});
             if (options.language === "csharp") scheduleDiagnostics();
         });
-        editors[id] = { editor: editor, dotNetRef: dotNetRef };
+        editors[id] = { editor: editor, dotNetRef: dotNetRef, isJson: isJson };
 
         // Run an initial diagnostic pass so existing scripts show their markers.
-        if (options.language === "csharp") scheduleDiagnostics();
+        if (language === "csharp") scheduleDiagnostics();
+    }
+
+    function setJsonSchema(id, schemaJson) {
+        const entry = editors[id];
+        if (!entry || !entry.isJson) return;
+        applyJsonSchema(id, schemaJson);
     }
 
     function setEditorOption(id, optionName, value) {
@@ -377,6 +433,15 @@
     function dispose(id) {
         const entry = editors[id];
         if (!entry) return;
+        // Drop this editor's json schema entry and its explicitly-URI'd model so
+        // a disposed json editor leaves nothing behind in the global defaults.
+        if (entry.isJson) {
+            try { applyJsonSchema(id, null); } catch (e) {}
+            try {
+                const model = monaco.editor.getModel(modelUriFor(id));
+                if (model) model.dispose();
+            } catch (e) {}
+        }
         try { entry.editor.dispose(); } catch (e) {}
         delete editors[id];
     }
@@ -386,6 +451,7 @@
         setValue: setValue,
         getValue: getValue,
         setMarkers: setMarkers,
+        setJsonSchema: setJsonSchema,
         setEditorOption: setEditorOption,
         format: format,
         revealLine: revealLine,

tests/ZB.MOM.WW.ScadaBridge.CentralUI.Tests/Design/ParameterValueFormMonacoSchemaTests.cs

@@ -0,0 +1,101 @@
+using Bunit;
+using Microsoft.Extensions.DependencyInjection;
+using NSubstitute;
+using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Shared;
+using ZB.MOM.WW.ScadaBridge.CentralUI.Services;
+
+namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Design;
+
+/// <summary>
+/// M9-T31: the raw-JSON escape hatch in <see cref="ParameterValueForm"/> (the
+/// fallback for an unresolved <c>$ref</c> / unknown-type node) is a Monaco
+/// <c>json</c> editor wired with the form's RESOLVED schema, so Monaco's
+/// built-in JSON language gives schema-driven hover + completion. These tests
+/// assert at the C#/interop boundary that the resolved schema (with
+/// <c>{"$ref":"lib:Name"}</c> inlined) reaches the editor's <c>JsonSchema</c>
+/// parameter — the JS hover/completion itself is Monaco-built-in and not
+/// unit-testable here.
+/// </summary>
+public class ParameterValueFormMonacoSchemaTests : BunitContext
+{
+    private readonly ISchemaLibraryQueryService _library = Substitute.For<ISchemaLibraryQueryService>();
+
+    public ParameterValueFormMonacoSchemaTests()
+    {
+        // The escape-hatch surface renders a MonacoEditor whose JS interop is not
+        // exercised here — Loose mode lets the unconfigured createEditor call no-op
+        // so the render completes and we can assert on the editor's parameters.
+        JSInterop.Mode = JSRuntimeMode.Loose;
+        _library.GetSchemaMapAsync(Arg.Any<CancellationToken>())
+            .Returns(new Dictionary<string, string>());
+        Services.AddSingleton(_library);
+    }
+
+    [Fact]
+    public void EscapeHatch_RendersMonacoJsonEditor_NotPlainTextarea()
+    {
+        // A nested field whose $ref cannot be resolved drops to the raw-JSON
+        // escape hatch. That surface must now be a Monaco json editor.
+        const string schema = """
+            {
+              "type": "object",
+              "properties": {
+                "payload": { "$ref": "lib:Missing" }
+              }
+            }
+            """;
+
+        var cut = Render<ParameterValueForm>(p => p
+            .Add(x => x.ParameterDefinitions, schema)
+            .Add(x => x.Values, new Dictionary<string, object?>()));
+
+        var editor = cut.FindComponent<MonacoEditor>();
+        Assert.Equal("json", editor.Instance.Language);
+        // No plain <textarea> fallback remains for the escape hatch.
+        Assert.Empty(cut.FindAll("textarea"));
+    }
+
+    [Fact]
+    public void EscapeHatch_MonacoEditor_ReceivesResolvedSchema_WithRefInlined()
+    {
+        // The library entry "Address" resolves to an object with street/city.
+        const string libSchema = """
+            {
+              "type": "object",
+              "properties": {
+                "street": { "type": "string" },
+                "city": { "type": "string" }
+              }
+            }
+            """;
+        _library.GetSchemaMapAsync(Arg.Any<CancellationToken>())
+            .Returns(new Dictionary<string, string> { ["Address"] = libSchema });
+
+        // Root has a RESOLVABLE $ref field (shipTo → Address) plus an
+        // UNRESOLVABLE one (payload) that forces the escape-hatch Monaco editor.
+        const string schema = """
+            {
+              "type": "object",
+              "properties": {
+                "shipTo": { "$ref": "lib:Address" },
+                "payload": { "$ref": "lib:Missing" }
+              }
+            }
+            """;
+
+        var cut = Render<ParameterValueForm>(p => p
+            .Add(x => x.ParameterDefinitions, schema)
+            .Add(x => x.Values, new Dictionary<string, object?>()));
+
+        var editor = cut.FindComponent<MonacoEditor>();
+        var jsonSchema = editor.Instance.JsonSchema;
+
+        Assert.False(string.IsNullOrWhiteSpace(jsonSchema));
+        // The RESOLVED shape is fed to Monaco: the $ref target's fields are
+        // inlined (street/city present), and the lib: pointer text is gone.
+        Assert.Contains("street", jsonSchema!);
+        Assert.Contains("city", jsonSchema!);
+        Assert.DoesNotContain("lib:Address", jsonSchema!);
+        Assert.DoesNotContain("$ref", jsonSchema!);
+    }
+}