fuelboard/BACKLOG.md

# FuelBoard Backlog

FuelBoard — England-wide petrol-station price widget + app.
Relay mirrors the UK gov data (hourly CSV); app fetches the full-UK dump
(~8,038 stations, all prices) once per 12 h and filters/sorts on-device.

Priority guide: P0 = next build, P1 = soon, P2 = later, P3 = maybe/idea.
Status: TODO / IN PROGRESS / DONE / BLOCKED.

---

## P0 — Next build

- [ ] **Price history archive (start now — warm the data for Trends)** — relay-api
  appends one daily snapshot (digest-change-triggered, once per calendar day) using
  the existing `relay_snapshot.py` shape; prune to ~90 days (~18 MB). No UI
  dependency: accumulating TODAY means the Trends graph launches with weeks of real
  history instead of an empty chart. Optional first-weeks tweak: hourly snapshots to
  build history faster, then settle to daily. Later add
  `/api/v1/history?station=&fuel=&days=` (keyless, X-Client-tagged like
  `/api/v1/stations`).

## P1 — Soon

- [x] **Siri: "Cheapest [fuel] near me"** — `AppShortcutsProvider` + `CheapestFuelIntent`
  (App Intents, iOS 16+), dialog + price-card snippet, cached full-UK dump first
  with freshness label ("as of 6am"), last-known-location fallback. Constraint:
  fresh-data path needs a reachable source off-LAN — cached answers work anywhere
  the app has previously fetched (see P3 data mirror). Interim: the relay on
  Tailscale (100.120.217.98:8789) is reachable off-LAN for testing; relay will
  move to a permanent box or the GitHub mirror long-term. *DONE — radius-scoped
  lookup `037c241` (real-data regression: GULF HISTON 100.9p 132 mi away),
  per-fuel literal-word shortcuts `e55078c`, names = app words `a3b6f37`, plus
  Directions-to-cheapest `caadf18` + spoken hand-off `aed99e3`.*
- [ ] **Siri: "Closest [fuel] station"** — same plumbing as cheapest, sort by
  distance instead of price. Free second phrase in the same `AppShortcutsProvider`.
- [ ] **Favourites Trends graph** — price history chart for starred stations.
  Swift Charts (iOS 26 target) line chart in the Favourites tab; one series per
  favourite, fuel-scoped (station, fuel) pairs map 1:1 to the archive. Default =
  absolute price lines; toggle "vs cheapest favourite" re-baselines to 0 as signed
  pence (mirrors the Cheapest/Closest delta pattern users already know). Reuse the
  capsule fuel picker; range control 7/30/90 days; respects the price-display
  toggle; honest empty-state copy in Localizable.strings ("Prices are recorded from
  each refresh — check back in a few days"). No widget in v1 (one-kind rule).
  Depends on the P0 archive.

## P2 — Later

- [ ] **Shortcuts: station price lookup** — `StationEntity` + `EntityQuery` so
  Shortcuts/Siri pick a station by name; `ReturnsValue<Double>` enables user
  automations ("get cheapest diesel → notify").
- [x] **Siri: favourite station price** — "How much is my favourite unleaded?"
  `FavouriteFuelPriceIntent`: TOP favourite per fuel (first in the manual
  Favourites order — `SiriCheapestLookup.topFavourite`, refresh-vs-dump with
  offline cached-snapshot fallback); no location required (distance shown only
  when the saved fix exists). `DirectionsToFavouriteFuelIntent` (Maps
  hand-off, station announced first) stays in code but carries no voice
  phrases — every favourite price card has the interactive Directions button
  (`6d7254e`), and the voice slots went to Directions-to-Cheapest (`8a4c472`).
  *DONE — favourites already carried station snapshots, so no `StationEntity`
  dependency.*
- [ ] **Siri: on-screen awareness (View Annotations + StationEntity)** — iOS
  26/27 Siri prefers the visible screen over the App Shortcut when the app is
  frontmost; without view annotations it answers from the rendered screen
  (unstructured "screenshot" parse) — visible tab/sort/radius, not the full
  dataset or the intent's logic. Fix: `StationEntity` (shared with the station
  lookup P2 above) + `.appEntityIdentifier` on station rows (collection
  annotation on the List) + `NSUserActivity` on the station detail/map +
  App Schema conformance (optional `IndexedEntity` for Spotlight semantic
  search). Verify annotations with AppIntentsTesting (P3). Off-screen/locked
  requests already route to `CheapestFuelIntent` correctly; this closes the
  frontmost gap. WWDC26: "Build intelligent Siri experiences with App Schemas"
  + "Explore advanced App Intents features".
- [ ] **Lock screen widgets** — new `FuelPriceLockScreen` kind (fuel-only config
  intent, reuses `FuelPriceTimelineProvider`): `accessoryRectangular` (cheapest
  station + price + distance), `accessoryCircular` (price ring), `accessoryInline`
  ("⛽ 139.9p"). Provider + `containerBackground` already exist; must branch the
  view for accessory families (current `else` renders `stationList`). Bonus:
  StandBy mode. ~1 session.

- [ ] **CarPlay** — widgets render but can't launch Maps; consider a proper CarPlay
  scene (CPListTemplate) for navigation deep-links.
- [ ] **Alert region tuning** — make alert trigger radius + dedup window
  user-configurable (currently fixed 300 m trigger / 1 per station per hour).
- [ ] **Pull-to-refresh spinner state** — surface refresh in-flight state
  (currently `refreshable` fires but no visible progress in the row list).
- [ ] **Offline first-run** — first launch without network currently shows empty
  states; bundle a sample dump so the app demos offline.
- [ ] **Localization** — UK English only today; audit string catalog for l10n.
- [ ] **Dark mode polish** — verify brand logos (white-circle clips) and RAG dot
  contrast under dark appearance on-device.
- [ ] **Trends: national average overlay + per-day min/max** — the full dump is
  already held, so the UK/regional average line is computable locally; archive can
  store per-day min/max so the chart shows intraday spikes, not just the daily point.

## P3 — Ideas / Research

- [ ] **Siri: create fuel alert** — voice-create an alert for a station. Deferred:
  alert semantics (cheapest-within-radius + hourly dedup) are hard to express in
  a dialog; needs the alert engine surfaced as an intent.
- [ ] **App Intents testing** — AppIntentsTesting (iOS 27) for intent coverage
  instead of XCUITest when the Siri features land.

- [ ] **Production data mirror (GitHub)** — relay pushes the synced dump
  (`stations.json` + `latest.json` version pointer) to a PUBLIC GitHub repo; the
  app fetches `raw.githubusercontent.com` with the LAN relay as fallback source.
  Public repo required for App Review (reviewer must fetch the data themselves);
  HTTPS/ATS fine; plain JSON data is not "remote code" (2.5.2-safe); bundle a small
  fallback dump so the app never demos empty. Needs GitHub PAT (aptonline account).
- [ ] **Fuel-price prediction** — "price tends up/down" arrow derived from the
  price-history archive (P0). Cheap once the archive + Trends graph exist; keep a
  separate phase. Backlog ancestry: this was the original "relay could keep a
  rolling archive" idea — the archive is now P0 and the Trends graph (P1) is its
  visible half.
- [ ] **Widget sparkline** — medium-widget mini sparkline of a favourite's 30-day
  trend, after the Trends UI lands (one-kind rule preserved).
- [ ] **Price alerts for a specific station** — notify when a starred station's
  price drops below a user threshold.
- [ ] **Share sheet** — share "Cheapest Unleaded near me" as text/image card.
- [ ] **Watch app** — glanceable cheapest-price complication (WatchKit + shared
  app-group store; watch target would need to be added to the project).
- [ ] **App Clip** — 10 MB budget for "find cheapest fuel nearby" without install.
- [ ] **Widget picker: dual-unit distance labels** — the Edit-Widget Distance row
  label is cached by the system at sheet-render time and only re-resolves on
  picker interaction, so "mirror the app unit" goes stale. Fix: label options
  with both units ("5 miles (8 km)") so nothing can go stale; widget rows keep
  mirroring the live unit.
- [ ] **Localizable.strings: normalize keys to match copy** — today 8 onboarding
  keys diverge from their values (key = old source literal, value = tightened
  copy, e.g. "…updated twice a day" key vs "…updated daily" value). Option to
  rename keys so key == value everywhere. Requires sweeping every Swift
  occurrence of the old literal (Text/NSLocalizedString) AND updating key +
  value together in one commit + rebuild — renaming the file entry alone
  silently reverts copy to the Swift literal at next build. Not recommended:
  keys are invisible anchors; value edits already change copy without code
  changes, and normalization reintroduces divergence on the next value edit.

## Done (recent)

- [x] Switch dataset to govuk API data — official Fuel Finder OAuth API via
  relay-api :8789 (source: api, ~8,012 stations); app baseURL → :8789; credentials
  live in relay `.env` only, never in the IPA
- [x] Widget configuration — per-widget fuel/sort/distance via
  `WidgetConfigurationIntent` (`AppIntentConfiguration`), distance options as
  `WidgetDistance` AppEntity (`26e724f`); small widget gained Favourites
  (`d0bd4e7`) + `.systemMedium` (`b94f769`)
- [x] Unit test target for the app — FuelBoardShared XCTest target, 37 tests
  (title sanitizer, decode price guard, RAG thresholds, cheapest/closest baseline,
  miles↔km)
- [x] Backlog hygiene — implemented items marked DONE, obsolete pruned
- [x] Sync retry with exponential backoff — relay-api retries failed syncs
  15s→15min cap; `/health` exposes retry state (`6a58275`)
- [x] England-wide full-UK dump, on-device filtering (relay `142061b`, app `cf9765b`)
- [x] Cache-first, 12 h gate, pull-to-refresh only
- [x] Distance filter 5/10/15 miles, local-only changes (no re-fetch)
- [x] Closest mode = whole country, distance picker disabled
- [x] Delta/TOP baseline = cheapest-within-radius in both modes
- [x] Three-layer price sanitisation (relay band 50–500p / app decode guard / title-case)
- [x] Title-case station names (chunk-aware sanitizer)
- [x] Native large-title navigation (Mail-style collapse) — `313fe84`
- [x] E10/E5 bracket labels in picker + descriptions — `05f3ef0`
- [x] Gitea remotes created + pushed (`apt/fuelboard`, `apt/fuelboard-relay`)
- [x] Brand logos: proper 2x/3x assets, 75% smaller (315 KB → 79 KB)
- [x] Security audit (see SECURITY.md)
- [x] App Store approval gotcha review (see APPSTORE.md)