{side}

{label}

{selected ? ( {selected.claimCount}{" "} claims ) : null}

); } // --------------------------------------------------------------------------- // Not-found branch — surfaces when the backend reports 404 for one of // the picks. Most likely cause: a bookmark referencing a now-deleted // batch, or another agent deleting between the picker load and the // diff fetch. // --------------------------------------------------------------------------- function NotFoundState({ a, b, onReset, }: { a: string; b: string; onReset: () => void; }) { return ( ); } // --------------------------------------------------------------------------- // Section header — § N + small italic vertical-rl label. Reused by // both the picks and diff sections so the folio is uniform. // --------------------------------------------------------------------------- function Folio({ section, label, topClass = "top-7" }: { section: string; label: string; topClass?: string; }) { return (

{section}

{label}

); } // --------------------------------------------------------------------------- // Page // --------------------------------------------------------------------------- export function BatchDiff() { // URL → state via react-router. Keeps MemoryRouter (tests) and // BrowserRouter (production) symmetric: both update the // useSearchParams hook on every navigation. const [searchParams, setSearchParams] = useSearchParams(); const { a, b } = useMemo( () => readIdsFromParams(searchParams), [searchParams], ); const updateIds = useCallback( (next: { a: string | null; b: string | null }) => { const params = new URLSearchParams(searchParams); if (next.a === null) params.delete("a"); else params.set("a", next.a); if (next.b === null) params.delete("b"); else params.set("b", next.b); setSearchParams(params, { replace: true }); }, [searchParams, setSearchParams], ); const setA = useCallback( (id: string) => updateIds({ a: id, b }), [b, updateIds], ); const setB = useCallback( (id: string) => updateIds({ a, b: id }), [a, updateIds], ); const reset = useCallback(() => updateIds({ a: null, b: null }), [updateIds]); const { data: batches, isLoading: loadingBatches, isError: batchesError, error: batchesErrorMsg, refetch: refetchBatches, } = useBatches(100); // Only fire the diff once both pickers have a value. The hook also // gates on this internally (defense-in-depth), so a half-picked URL // never hits the backend. const diff = useBatchDiff(a, b); const ready = a !== null && b !== null; // --- error / status derivation ------------------------------------ const errKind: "network" | "not_found" | null = diff.error ? diff.error instanceof ApiError && diff.error.status === 404 ? "not_found" : "network" : null; // ----------------------------------------------------------------- // Stagger choreography // ----------------------------------------------------------------- const heroDelay = 0; const foldDelay = 220; const titleDelay = 320; const picksDelay = 460; const diffDelay = 600; // --- render ------------------------------------------------------- return (

{/* ================================================================= HERO — DARK EDITORIAL HEADER ================================================================= */}

{/* Ghost "DIFF" watermark — a print-shop stamp behind the title. */}

Diff · Sheet 01 · A vs B

Compare{" "} batches.

837P · 835 · first vs second

Pick a batch for each side

Pick two parsed batches — typically a submitted 837P and its corrected follow-up — and see what was added, removed, or changed between them.

{/* ================================================================= FOLD — TORN PAGE ================================================================= */}

{Array.from({ length: 48 }, (_, i) => ( ))}

↘ A → B ↙

{/* ================================================================= PAPER PLANE ================================================================= */}

{/* Paper grain */}

\")", backgroundSize: "160px 160px", mixBlendMode: "multiply", }} /> {/* Title block */}

Sheet 01 · Compare two batches

Compare them.

Two picks, three buckets. What the second batch added, what the first batch dropped, and which claims moved between them.

On the wire

{a ? "A" : "—"} {b ? "B" : "—"}

{ready ? "ready to diff" : "two picks needed"}

{/* § 01 The picks */}

The picks

One on each side.

A is the "before" — B is the "after". A picked batch can't be picked again on the other side.

{/* § 02 The diff */}

The diff

What moved.

{ready ? (

Three buckets — added in B, removed from A, changed in place. Unchanged claims are summarized but not listed.

) : null}

{batchesError ? (

refetchBatches()} />

) : !ready ? (

} eyebrow="Batch diff · awaiting picks" message="Choose one batch for A and one for B to compute the diff." />

) : loadingBatches ? ( ) : errKind === "not_found" ? ( ) : diff.isError ? (

diff.refetch()} />

) : diff.isLoading || !diff.data ? ( ) : ( )}

{/* Action footer — always visible when ready so the operator can clear or force-refresh without scrolling back to the picker. */} {ready ? (

{diff.isFetching ? ( Refreshing… ) : ( <> Comparing{" "} {a} {" "} with{" "} {b} . )}

) : null} {/* Footer */}

End of sheet 01 Cyclone · Batch diff {ready ? "A vs B" : "awaiting picks"}

); }