sync

apps/web/src/lib/pagination.ts

@@ -0,0 +1,31 @@
+export type PageWindow = {
+  start: number;
+  end: number;
+  page: number;
+  pages: number;
+  previousOffset: number | null;
+  nextOffset: number | null;
+};
+
+export const pageWindow = (total: number, limit: number, offset: number): PageWindow => {
+  const safeTotal = Math.max(0, Math.trunc(total));
+  const safeLimit = Math.max(1, Math.trunc(limit));
+  const safeOffset = Math.max(0, Math.trunc(offset));
+  const end = Math.min(safeOffset + safeLimit, safeTotal);
+  return {
+    start: safeTotal > 0 && safeOffset < safeTotal ? safeOffset + 1 : 0,
+    end,
+    page: Math.floor(safeOffset / safeLimit) + 1,
+    pages: Math.max(1, Math.ceil(safeTotal / safeLimit)),
+    previousOffset: safeOffset > 0 ? Math.max(0, safeOffset - safeLimit) : null,
+    nextOffset: end < safeTotal ? safeOffset + safeLimit : null,
+  };
+};
+
+export const pageHref = (path: string, search: URLSearchParams, offset: number, anchor = "") => {
+  const params = new URLSearchParams(search);
+  if (offset > 0) params.set("offset", String(offset));
+  else params.delete("offset");
+  const query = params.toString();
+  return `${path}${query ? `?${query}` : ""}${anchor}`;
+};