From 4b3466a1b0854ac335bbeb04c58da258b2a237a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Untersch=C3=BCtz?= <sebastian@unterschutz.de>
Date: Sun, 4 Jan 2026 17:41:46 +0100
Subject: [PATCH] Revise room-to-pod assignment logic with hash-based
 distribution for improved load balancing and better replica handling.

---
 cmd/server/main.go | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/cmd/server/main.go b/cmd/server/main.go
index ec2ce21..1a41acd 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -275,34 +275,30 @@ func isResponsibleForRoom(roomID string) bool {
 		return true
 	}
 
-	// Hash-basierte Zuweisung: RoomID → Pod
-	// Einfacher Ansatz: erster Buchstabe von RoomID
-	// A-M → Pod 0, N-Z → Pod 1
 	if len(roomID) == 0 {
 		return true
 	}
 
-	firstChar := roomID[0]
+	// Hash-basierte Zuweisung: RoomID → Pod
+	// Verwende einfachen Hash für bessere Verteilung
+	hash := 0
+	for _, c := range roomID {
+		hash = (hash*31 + int(c)) % 2
+	}
 
-	// Für 2 Replicas: A-M und N-Z splitten
-	if totalReplicas == "2" {
-		// Pod Namen sind meist: escape-game-0, escape-game-1, etc.
-		if firstChar <= 'M' || firstChar <= 'm' {
-			return serverID[len(serverID)-1] == '0' || !hasDigitSuffix()
+	// Bestimme Pod-Nummer aus ServerID
+	podNumber := 0
+	if len(serverID) > 0 {
+		lastChar := serverID[len(serverID)-1]
+		if lastChar >= '0' && lastChar <= '9' {
+			podNumber = int(lastChar - '0')
 		}
-		return serverID[len(serverID)-1] == '1' || hasDigitSuffix()
 	}
 
-	// Fallback: immer zuständig
-	return true
-}
+	responsible := (hash % 2) == (podNumber % 2)
+	log.Printf("🎯 Room '%s' → Hash=%d, Pod=%d (%s) → Responsible=%v", roomID, hash, podNumber, serverID, responsible)
 
-func hasDigitSuffix() bool {
-	if len(serverID) == 0 {
-		return false
-	}
-	lastChar := serverID[len(serverID)-1]
-	return lastChar >= '0' && lastChar <= '9'
+	return responsible
 }
 
 func loadServerAssets(w *game.World) {