Add persistent history stacks

2026-07-23 21:48:24 +02:00
parent 2d0aa11d9c
commit 1e4dd26bb8
24 changed files with 2294 additions and 15 deletions
@@ -0,0 +1,121 @@
+import { and, desc, eq, max } from "drizzle-orm";
+import type { ProjectRevisionSource } from "../../domain/ports/project-revision.store.js";
+import type { AppDatabase } from "../database-context.js";
+import { projectHistoryStackEntries } from "../schema/project-history-stack-entries.js";
+
+export interface ApplyProjectHistoryTransitionInput {
+  projectId: string;
+  source: ProjectRevisionSource;
+  recordedChangeSetId: string;
+  targetChangeSetId?: string;
+}
+
+export function applyProjectHistoryTransition(
+  database: AppDatabase,
+  input: ApplyProjectHistoryTransitionInput
+) {
+  if (input.source === "user") {
+    database
+      .delete(projectHistoryStackEntries)
+      .where(
+        and(
+          eq(projectHistoryStackEntries.projectId, input.projectId),
+          eq(projectHistoryStackEntries.stack, "redo")
+        )
+      )
+      .run();
+    push(
+      database,
+      input.projectId,
+      input.recordedChangeSetId,
+      "undo"
+    );
+    return;
+  }
+
+  if (input.source === "undo" || input.source === "redo") {
+    if (!input.targetChangeSetId) {
+      throw new Error(
+        `${input.source} requires a target change set.`
+      );
+    }
+    const sourceStack = input.source;
+    const targetStack = input.source === "undo" ? "redo" : "undo";
+    const top = database
+      .select({
+        changeSetId: projectHistoryStackEntries.changeSetId,
+      })
+      .from(projectHistoryStackEntries)
+      .where(
+        and(
+          eq(projectHistoryStackEntries.projectId, input.projectId),
+          eq(projectHistoryStackEntries.stack, sourceStack)
+        )
+      )
+      .orderBy(desc(projectHistoryStackEntries.position))
+      .limit(1)
+      .get();
+    if (!top || top.changeSetId !== input.targetChangeSetId) {
+      throw new Error(
+        `${input.source} target is not the top ${sourceStack} command.`
+      );
+    }
+
+    const nextPosition = getNextPosition(
+      database,
+      input.projectId,
+      targetStack
+    );
+    const moved = database
+      .update(projectHistoryStackEntries)
+      .set({ stack: targetStack, position: nextPosition })
+      .where(
+        and(
+          eq(projectHistoryStackEntries.projectId, input.projectId),
+          eq(
+            projectHistoryStackEntries.changeSetId,
+            input.targetChangeSetId
+          )
+        )
+      )
+      .run();
+    if (moved.changes !== 1) {
+      throw new Error("Project history stack changed during transition.");
+    }
+  }
+}
+
+function push(
+  database: AppDatabase,
+  projectId: string,
+  changeSetId: string,
+  stack: "undo" | "redo"
+) {
+  database
+    .insert(projectHistoryStackEntries)
+    .values({
+      projectId,
+      changeSetId,
+      stack,
+      position: getNextPosition(database, projectId, stack),
+    })
+    .run();
+}
+
+function getNextPosition(
+  database: AppDatabase,
+  projectId: string,
+  stack: "undo" | "redo"
+) {
+  const current = database
+    .select({ position: max(projectHistoryStackEntries.position) })
+    .from(projectHistoryStackEntries)
+    .where(
+      and(
+        eq(projectHistoryStackEntries.projectId, projectId),
+        eq(projectHistoryStackEntries.stack, stack)
+      )
+    )
+    .get();
+  return (current?.position ?? 0) + 1;
+}