fix: post dated inclusions subsequently revoked

Author: tstephen-nhs

packages/gsul/src/getStatusUpdates.ts

@@ -81,10 +81,20 @@ export const filterOutFutureReduceToLatestUpdates = (
   })
 
   // flatten both regular and post-dated updates into single array
+  // but exclude post-dated updates if they have been revoked by a subsequent regular update
   const uniqueItems: Array<itemType> = []
   Object.values(itemGroups).forEach(group => {
     if (group.regular) uniqueItems.push(group.regular)
-    if (group.postDated) uniqueItems.push(group.postDated)
+    if (group.postDated) {
+      // Only include post-dated update if there's no regular update that came after it was set
+      const postDatedSetTime = Date.parse(group.postDated.postDatedLastModifiedSetAt)
+      const regularUpdateTime = group.regular ? Date.parse(group.regular.lastUpdateDateTime) : 0
+
+      // If the regular update came after the post-dated was set, it revokes the post-dated update
+      if (!group.regular || regularUpdateTime <= postDatedSetTime) {
+        uniqueItems.push(group.postDated)
+      }
+    }
   })
 
   const result: outputPrescriptionType = {

packages/gsul/tests/testBuildResult.test.ts

@@ -267,6 +267,41 @@ const scenarios: Array<scenariosType> = [
       onboarded: false,
       items: []
     }
+  },
+  {
+    scenarioDescription: "should return With pharmacy when RTC has been revoked",
+    currentTime: new Date("2025-12-11T12:00:00Z").getTime(),
+    inputPrescriptions: {
+      prescriptionID: "abc",
+      odsCode: "123"
+    },
+    queryResults: [
+      {
+        itemId: "item_1",
+        latestStatus: "Ready to collect",
+        isTerminalState: false,
+        lastUpdateDateTime: "2025-12-11T10:00:00Z",
+        postDatedLastModifiedSetAt: "2025-12-10T10:00:00Z"
+      },
+      {
+        itemId: "item_1",
+        latestStatus: "With pharmacy",
+        isTerminalState: false,
+        lastUpdateDateTime: "2025-12-10T11:00:00Z"
+      }
+    ],
+    expectedResult: {
+      prescriptionID: "abc",
+      onboarded: true,
+      items: [
+        {
+          itemId: "item_1",
+          latestStatus: "With pharmacy",
+          isTerminalState: false,
+          lastUpdateDateTime: "2025-12-10T11:00:00Z"
+        }
+      ]
+    }
   }
 ]
 describe("Unit tests for buildResults", () => {