Add external model persistence foundation

src/db/repositories/external-model-state.repository.ts

@@ -0,0 +1,74 @@
+import { asc, eq } from "drizzle-orm";
+import type { ExternalModelStateReader } from "../../domain/ports/external-model-state.reader.js";
+import type { ExternalModelStateSnapshot } from "../../external-model/domain/external-model-contracts.js";
+import type { AppDatabase } from "../database-context.js";
+import { externalImportBatches } from "../schema/external-import-batches.js";
+import { externalModelObjects } from "../schema/external-model-objects.js";
+import { externalModelSources } from "../schema/external-model-sources.js";
+import { externalRoomMappings } from "../schema/external-room-mappings.js";
+import { projects } from "../schema/projects.js";
+
+const emptyState = (): ExternalModelStateSnapshot => ({
+  source: null,
+  importBatches: [],
+  roomMappings: [],
+  objects: [],
+});
+
+export class ExternalModelStateRepository implements ExternalModelStateReader {
+  constructor(private readonly database: AppDatabase) {}
+
+  getByProject(projectId: string) {
+    const project = this.database
+      .select({ id: projects.id })
+      .from(projects)
+      .where(eq(projects.id, projectId))
+      .get();
+    if (!project) return { projectExists: false, state: emptyState() };
+
+    const source = this.database
+      .select()
+      .from(externalModelSources)
+      .where(eq(externalModelSources.projectId, projectId))
+      .get() ?? null;
+    if (!source) return { projectExists: true, state: emptyState() };
+
+    const batches = this.database
+      .select()
+      .from(externalImportBatches)
+      .where(eq(externalImportBatches.sourceId, source.id))
+      .orderBy(
+        asc(externalImportBatches.appliedProjectRevision),
+        asc(externalImportBatches.id)
+      )
+      .all();
+    const roomMappings = this.database
+      .select()
+      .from(externalRoomMappings)
+      .where(eq(externalRoomMappings.sourceId, source.id))
+      .orderBy(
+        asc(externalRoomMappings.normalizedSourceRoomKey),
+        asc(externalRoomMappings.id)
+      )
+      .all();
+    const objects = this.database
+      .select()
+      .from(externalModelObjects)
+      .where(eq(externalModelObjects.sourceId, source.id))
+      .orderBy(asc(externalModelObjects.ifcGuid), asc(externalModelObjects.id))
+      .all();
+
+    return {
+      projectExists: true,
+      state: {
+        source,
+        importBatches: batches.map(({ originalBytes, ...batch }) => ({
+          ...batch,
+          originalContentBase64: Buffer.from(originalBytes).toString("base64"),
+        })),
+        roomMappings,
+        objects,
+      },
+    };
+  }
+}