Add project command API

src/db/repositories/project-history.repository.ts

@@ -1,10 +1,15 @@
-import { asc, eq } from "drizzle-orm";
+import { and, asc, desc, eq } from "drizzle-orm";
+import { deserializeProjectCommand } from "../../domain/models/project-command.model.js";
 import type {
+  ProjectHistoryCommand,
+  ProjectHistoryDirection,
   ProjectHistoryState,
   ProjectHistoryStore,
 } from "../../domain/ports/project-history.store.js";
 import type { AppDatabase } from "../database-context.js";
+import { projectChangeSets } from "../schema/project-change-sets.js";
 import { projectHistoryStackEntries } from "../schema/project-history-stack-entries.js";
+import { projectRevisions } from "../schema/project-revisions.js";
 import { projects } from "../schema/projects.js";
 
 export class ProjectHistoryRepository implements ProjectHistoryStore {
@@ -41,4 +46,50 @@ export class ProjectHistoryRepository implements ProjectHistoryStore {
       redoChangeSetId: redoEntries.at(-1)?.changeSetId ?? null,
     };
   }
+
+  getNextCommand(
+    projectId: string,
+    direction: ProjectHistoryDirection
+  ): ProjectHistoryCommand | null {
+    const entry = this.database
+      .select({
+        changeSetId: projectHistoryStackEntries.changeSetId,
+        forwardPayloadJson: projectChangeSets.forwardPayloadJson,
+        inversePayloadJson: projectChangeSets.inversePayloadJson,
+      })
+      .from(projectHistoryStackEntries)
+      .innerJoin(
+        projectChangeSets,
+        eq(
+          projectChangeSets.id,
+          projectHistoryStackEntries.changeSetId
+        )
+      )
+      .innerJoin(
+        projectRevisions,
+        eq(projectRevisions.id, projectChangeSets.projectRevisionId)
+      )
+      .where(
+        and(
+          eq(projectHistoryStackEntries.projectId, projectId),
+          eq(projectHistoryStackEntries.stack, direction),
+          eq(projectRevisions.projectId, projectId)
+        )
+      )
+      .orderBy(desc(projectHistoryStackEntries.position))
+      .limit(1)
+      .get();
+    if (!entry) {
+      return null;
+    }
+
+    return {
+      changeSetId: entry.changeSetId,
+      command: deserializeProjectCommand(
+        direction === "undo"
+          ? entry.inversePayloadJson
+          : entry.forwardPayloadJson
+      ),
+    };
+  }
 }