From 7833e87aab11a015a72372cb7805d550e61241b5 Mon Sep 17 00:00:00 2001
From: Stephen Adamson <popertots@gmail.com>
Date: Fri, 10 Jul 2026 21:16:59 +0100
Subject: [PATCH] fix: add split-lunch detection with formatted time range
 warnings

---
 frontend/src/lib/lunchProtection.ts | 35 ++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/frontend/src/lib/lunchProtection.ts b/frontend/src/lib/lunchProtection.ts
index 701b183..ccc3cf9 100644
--- a/frontend/src/lib/lunchProtection.ts
+++ b/frontend/src/lib/lunchProtection.ts
@@ -212,6 +212,21 @@ export function getLunchProtectionForSlots(
 
 		if (isAdmin) {
 			if (gapWith < 30) {
+				const gapWasBelow30 = gapsWith.length > 1;
+				if (gapWasBelow30) {
+					const gapsWithout = findAllLunchGaps(windowStart, windowEnd, existingBookings);
+					const gapWithout = gapsWithout[0] ?? 0;
+					if (gapWithout >= 30 && gapWith < gapWithout) {
+						const firstGap = gapsWith[0] ?? 0;
+						const secondGap = gapsWith[1] ?? 0;
+						results.set(slotStartStr, {
+							isBlocked: false,
+							showWarning: true,
+							warningMessage: `This booking (${slotStartStr}–${slotEndStr}) would split your suggested lunch break into ${firstGap} and ${secondGap} minute blocks.`
+						});
+						continue;
+					}
+				}
 				results.set(slotStartStr, {
 					isBlocked: true,
 					showWarning: false,
@@ -221,11 +236,21 @@ export function getLunchProtectionForSlots(
 				const gapsWithout = findAllLunchGaps(windowStart, windowEnd, existingBookings);
 				const gapWithout = gapsWithout[0] ?? 0;
 				if (gapWith < gapWithout) {
-					results.set(slotStartStr, {
-						isBlocked: false,
-						showWarning: true,
-						warningMessage: `This booking would reduce lunch break to ${gapWith} minutes.`
-					});
+					if (gapsWith.length > 1) {
+						const firstGap = gapsWith[0] ?? 0;
+						const secondGap = gapsWith[1] ?? 0;
+						results.set(slotStartStr, {
+							isBlocked: false,
+							showWarning: true,
+							warningMessage: `This booking (${slotStartStr}–${slotEndStr}) would split your suggested lunch break into ${firstGap} and ${secondGap} minute blocks.`
+						});
+					} else {
+						results.set(slotStartStr, {
+							isBlocked: false,
+							showWarning: true,
+							warningMessage: `This booking would reduce lunch break to ${gapWith} minutes.`
+						});
+					}
 				}
 			}
 		} else {