From 98ce29e5fabef05abae308475c9fcd5ac63a7aaf Mon Sep 17 00:00:00 2001
From: Jack Williams <jack@semiautonomous.org>
Date: Mon, 23 Mar 2026 22:31:16 +1100
Subject: [PATCH] Preload note IDs to improve matchmaking

---
 src/ui/ArenaSession.ts | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/ui/ArenaSession.ts b/src/ui/ArenaSession.ts
index 4937816..1728fca 100644
--- a/src/ui/ArenaSession.ts
+++ b/src/ui/ArenaSession.ts
@@ -117,12 +117,28 @@ export default class ArenaSession {
       this.plugin.registerDomEvent(win, 'beforeunload', this.popoutUnloadHandler);
     }
 
+    await this.preloadFileIds();
     this.pickNextPair();
     await this.openCurrent();
     this.updateOverlay();
     this.updateStabilityBar();
   }
 
+  /**
+   * Read note IDs for all files up-front so the matchmaker can look up
+   * actual stats on the first pair pick, allowing the information-gain
+   * algorithm to prioritise genuinely new notes.
+   */
+  private async preloadFileIds(): Promise<void> {
+    const propName = this.plugin.settings.idPropertyName;
+    await Promise.all(
+      this.files.map(async (f) => {
+        const id = await getNoteId(this.app, f, propName);
+        if (id) this.idByPath.set(f.path, id);
+      }),
+    );
+  }
+
   async end(opts?: { forUnload?: boolean }) {
     this.clearScrollSync();