feat: allow saving to same SR series (#4889)

extensions/default/src/utils/getSRSeriesAndInstanceNumber.js

@@ -0,0 +1,48 @@
+const MIN_SR_SERIES_NUMBER = 4700;
+
+export function getNextSeriesNumber({ displaySetService, modality, minSeriesNumber }) {
+  const activeDisplaySets = displaySetService.getActiveDisplaySets();
+  const modalityDisplaySets = activeDisplaySets.filter(ds => ds.Modality === modality);
+  const modalitySeriesNumbers = modalityDisplaySets.map(ds => ds.SeriesNumber);
+  const maxSeriesNumber = Math.max(...modalitySeriesNumbers, minSeriesNumber);
+
+  const allSeriesNumbers = activeDisplaySets.map(ds => ds.SeriesNumber);
+
+  let finalSeriesNumber = maxSeriesNumber + 1;
+  while (allSeriesNumbers.includes(finalSeriesNumber)) {
+    finalSeriesNumber++;
+  }
+
+  return { SeriesNumber: finalSeriesNumber, InstanceNumber: 1 };
+}
+
+export function getSRSeriesAndInstanceNumber({ displaySetService, SeriesInstanceUid }) {
+  if (!SeriesInstanceUid) {
+    return getNextSeriesNumber({
+      displaySetService,
+      modality: 'SR',
+      minSeriesNumber: MIN_SR_SERIES_NUMBER,
+    });
+  }
+
+  const displaySetsMap = displaySetService.getDisplaySetCache();
+  const displaySets = Array.from(displaySetsMap.values());
+  const srDisplaySet = displaySets.find(
+    ds => ds.Modality === 'SR' && ds.SeriesInstanceUID === SeriesInstanceUid
+  );
+  const InstanceNumber = srDisplaySet.instances?.length + 1;
+
+  if (!srDisplaySet?.SeriesNumber || !InstanceNumber) {
+    return getNextSeriesNumber({
+      displaySetService,
+      modality: 'SR',
+      minSeriesNumber: MIN_SR_SERIES_NUMBER,
+    });
+  }
+
+  return {
+    SeriesNumber: srDisplaySet.SeriesNumber,
+    InstanceNumber,
+    referenceDisplaySet: srDisplaySet,
+  };
+}