feat: services table with dnd

src/utils/lexorank/generation.ts

@@ -0,0 +1,38 @@
+import { LexoRank } from "lexorank";
+
+export function getNewLexorank(
+    left?: LexoRank | null,
+    right?: LexoRank | null
+): LexoRank {
+    if (right) {
+        if (left) return left?.between(right);
+        return right.between(LexoRank.min());
+    }
+    if (left) {
+        return left.between(LexoRank.max());
+    }
+    return LexoRank.middle();
+}
+
+export const getNewDndLexorank = <T>(
+    sourceIdx: number,
+    targetIdx: number,
+    items: T[],
+    key: keyof T
+): string => {
+    let leftIndex = targetIdx;
+    let rightIndex = targetIdx + 1;
+    if (targetIdx < sourceIdx) {
+        leftIndex = targetIdx - 1;
+        rightIndex = targetIdx;
+    }
+
+    const leftLexorank: LexoRank | null =
+        leftIndex >= 0 ? LexoRank.parse(items[leftIndex][key] as string) : null;
+    const rightLexorank: LexoRank | null =
+        rightIndex < items.length
+            ? LexoRank.parse(items[rightIndex][key] as string)
+            : null;
+
+    return getNewLexorank(leftLexorank, rightLexorank).toString();
+};