feat: render dashboard from model

src/lib/server/dashboard.test.ts

@@ -4,6 +4,7 @@ import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { afterEach, describe, expect, test } from "vitest";
 import { dimensionLabDashboardFixture } from "$lib/model/fixtures/dimensionlab";
+import { genericDashboardFixture } from "$lib/model/fixtures/generic";
 import { createDashboardStore, type DashboardStore } from "./db/dashboard-store";
 import { loadDashboardRuntime } from "./dashboard";
 
@@ -21,13 +22,30 @@ describe("dashboard runtime loader", () => {
 
     const runtime = loadDashboardRuntime(store);
 
-    expect(runtime.title).toBe(dimensionLabDashboardFixture.metadata.title);
-    expect(runtime.subtitle).toBe(dimensionLabDashboardFixture.metadata.subtitle);
-    expect(runtime.status).toBe("building");
+    expect(runtime.state).toBe("ready");
+    if (runtime.state !== "ready") throw new Error("expected ready dashboard");
+    expect(runtime.document.metadata.title).toBe(dimensionLabDashboardFixture.metadata.title);
+    expect(runtime.document.metadata.subtitle).toBe(dimensionLabDashboardFixture.metadata.subtitle);
     expect(runtime.schemaVersion).toBe(dimensionLabDashboardFixture.schemaVersion);
     expect(runtime.currentRevisionId).toBe(store.getActiveDashboard()?.currentRevisionId);
     expect(store.listRevisions()).toHaveLength(1);
   });
+
+  test("loads an existing active dashboard without reseeding", async () => {
+    const store = await createTestStore();
+    const seed = store.commitDashboard(genericDashboardFixture, {
+      actor: "test",
+      message: "existing dashboard",
+    });
+
+    const runtime = loadDashboardRuntime(store);
+
+    expect(runtime.state).toBe("ready");
+    if (runtime.state !== "ready") throw new Error("expected ready dashboard");
+    expect(runtime.currentRevisionId).toBe(seed.id);
+    expect(runtime.document.metadata.title).toBe(genericDashboardFixture.metadata.title);
+    expect(store.listRevisions()).toHaveLength(1);
+  });
 });
 
 async function createTestStore() {

src/lib/server/dashboard.ts

@@ -1,31 +1,42 @@
 import { dimensionLabDashboardFixture } from "$lib/model/fixtures/dimensionlab";
+import type { DashboardDocument } from "$lib/model";
 import {
   createDashboardStore,
+  DashboardPersistenceValidationError,
   type DashboardStore,
 } from "$lib/server/db/dashboard-store";
+import { UnsupportedDashboardModelVersionError } from "$lib/server/db/model-migrations";
 
-export type PlaceholderStatus = "ready" | "building";
+export type DashboardRuntimeState =
+  | DashboardRuntimeEmpty
+  | DashboardRuntimeInvalid
+  | DashboardRuntimeReady;
 
-export interface PlaceholderDashboard {
+export interface DashboardRuntimeReady {
+  state: "ready";
+  document: DashboardDocument;
+  schemaVersion: string;
+  currentRevisionId: string;
+}
+
+export interface DashboardRuntimeEmpty {
+  state: "empty";
   title: string;
   subtitle: string;
-  status: PlaceholderStatus;
   message: string;
-  schemaVersion?: string;
-  currentRevisionId?: string;
 }
 
-export function loadPlaceholderDashboard(): PlaceholderDashboard {
-  return {
-    title: "Dashboard Runtime",
-    subtitle: "Runtime scaffold",
-    status: "building",
-    message:
-      "SvelteKit is running. Later issues will replace this placeholder with the validated dashboard model.",
-  };
+export interface DashboardRuntimeInvalid {
+  state: "invalid";
+  title: string;
+  subtitle: string;
+  message: string;
+  errors: string[];
 }
 
-export function loadDashboardRuntime(store?: DashboardStore): PlaceholderDashboard {
+export function loadDashboardRuntime(
+  store?: DashboardStore,
+): DashboardRuntimeState {
   const dashboardStore = store || createDashboardStore();
 
   try {
@@ -37,16 +48,42 @@ export function loadDashboardRuntime(store?: DashboardStore): PlaceholderDashboa
     const document = active?.document || seeded.document;
     const currentRevisionId = active?.currentRevisionId || seeded.id;
 
+    if (!document) {
+      return {
+        state: "empty",
+        title: "No Dashboard Model",
+        subtitle: "No active document",
+        message: "No validated dashboard document is active yet.",
+      };
+    }
+
     return {
-      title: document.metadata.title,
-      subtitle: document.metadata.subtitle || "",
-      status: "building",
-      message:
-        "Active dashboard document loaded from SQLite. Later issues will replace this placeholder with model-driven rendering.",
+      state: "ready",
+      document,
       schemaVersion: document.schemaVersion,
       currentRevisionId,
     };
+  } catch (error) {
+    if (error instanceof DashboardPersistenceValidationError) {
+      return invalidRuntimeState(error.failure.errors);
+    }
+
+    if (error instanceof UnsupportedDashboardModelVersionError) {
+      return invalidRuntimeState([error.message]);
+    }
+
+    throw error;
   } finally {
     if (!store) dashboardStore.close();
   }
 }
+
+function invalidRuntimeState(errors: string[]): DashboardRuntimeInvalid {
+  return {
+    state: "invalid",
+    title: "Invalid Dashboard Model",
+    subtitle: "Validation failed",
+    message: "The active dashboard document could not be validated.",
+    errors,
+  };
+}