DriverVault/Phone App/README.md

# DriverVault — Phone App (Flutter)

A Flutter client for the DriverVault maintenance tracker. Talks **only** to the
API Server (same contract and auth as the web app — a PocketBase token relayed by
the server, not a JWT the server mints). At full feature parity with the web app.

Project name `drivervault_phone`, package id `com.drivervault.phoneapp`.
**Android is the supported target** — the older Flutter-web build path is
deprecated.

## Features

Once signed in, `RootShell` hosts the app behind a persistent **bottom
navigation bar** — Garage, Charging, Settings, and Users for admins — in an
`IndexedStack`, so each section keeps its state as you switch tabs.

- **Login** — email/password against `/api/auth/login`, password show/hide, and a
  collapsible **Server settings** section holding the address of the server the
  form signs into — plus the way back to the others once more than one has been
  added (see *More than one server*).
- **Biometric / face sign-in + app lock** — see the dedicated section below.
- **Garage (dashboard)** — car list with next-due status badges (date + km,
  worst-of), a "shared" chip on cars owned by someone else, pull-to-refresh and
  an **Add car** FAB. The header carries the **server picker** (see below), the
  theme toggle and log out.
- **Car detail** — all spec fields (incl. VIN and transmission / differential /
  brake / coolant specs), a **share** sheet (owner only), quick odometer update,
  edit car, and delete car (type-to-confirm; cascades). Actions are gated by the
  caller's access level (read-only vs write vs owner).

  **Which tabs a car shows, and in what order, belongs to the car** — the same
  arrangement the web app reads, so everyone it is shared with sees the same
  page. Edit it under the **tune** icon: switch tabs, Information rows, Service
  history columns and the parts a service can change on or off, and drag any of
  the first three lists by its handle to reorder it. (The parts have no order —
  they are a checkbox list inside one column, and their position says nothing a
  tab's or a column's does.) (The web rearranges by dragging the tab bar and the
  column headings themselves; on a touch screen those gestures belong to the tab
  bar and the scroll, so every arrangement is made in the picker instead.) Two
  things cannot be switched off: Information — a page with no tabs left would be
  a dead end — and the service Date, since a history with the day taken out
  stops being one. Both can still be moved. The tabs, in their default order:
  - **Connected service** — everything the manufacturer's own app knows about
    this car, read live under *your* account: headline readings (odometer, fuel
    or battery, range, charging state, position), the vehicle record, and one
    card per capability the plugin exposes, rendered from the server's flattened
    key/value pairs so a provider adding a field surfaces it without an app
    change. Offers to take the provider's odometer when it is ahead of the
    stored one. A car with no link yet gets a **connect** card instead, and the
    tab is hidden entirely for a user with no manufacturer account connected.
    Because the read runs under your own credentials, a car shared from someone
    else shows data here only if that vehicle is on your account too — it says
    so rather than failing.
  - **Service history** — date/odometer plus which parts were changed, with the
    next-due date/km derived by the server. The web lays those out as table
    columns; a phone has no width for a seven-column table, so a card renders the
    same columns as pieces — consecutive short ones share a wrapping line, and
    the parts, the notes and the file each take a line of their own. It reads the
    car's own hidden set and order, so a column switched off on either app is off
    on both, and the arrangement decides the grouping: move Notes between Km and
    Next date and the short columns split around it. Every part a service can
    have changed shares the one **parts** column — they are a growing list, and a
    column apiece would widen the web's table without end — and both that column
    and the form's Changed parts section come from `lib/service_parts.dart`, the
    twin of the web's `lib/serviceParts.js`. Which of them this car records is
    the car's own choice as well: a part switched off leaves the form's
    checkboxes and the cards' chips together, and nothing is written to the
    records, so switching it back on brings the old chips back.
  - **Technical check history** — the mandatory roadworthiness inspections
    (przegląd techniczny, MOT, TÜV). Result, cost, station, and the certificate's
    valid-until, which overrides the car's interval when present. A failed check
    derives no next date.
  - **Maintenance** — workshop visits and repairs outside the routine schedule:
    type/status, workshop, parts used, labour + parts cost, invoice number and a
    warranty-until badge.
  - **Fuel** — refills with a summary panel (average / best / worst consumption,
    cost per km, price per litre). Consumption is measured between full tanks, so
    partial fills roll into the next full one and a flagged missed fill leaves its
    window uncomputed rather than reporting a fictional figure.
  - **Charging cost** — charges with a summary panel (average / best / worst
    kWh/100km, cost per km, price per kWh). The electric twin of Fuel, and
    derived the same way: consumption is measured between full charges, so a
    top-up rolls into the next full one. Distinct from the **Charging** section
    in the bottom bar, which is the charger network and OCPP control.
  - **Documents** — insurance, registration, road tax and the rest, with a
    renewal badge driven by the server's expiry assessment.
  - **Parts catalog** — the per-car parts list.
  - **Reminders** — date- and/or odometer-triggered, one-off or recurring, with a
    **Mark done** action. Reminders the server derived from a document or service
    record are shown read-only.
- **Attachments** — one optional file per service record, technical check,
  workshop visit, refill, charge, document and part (PDF or image, up to 10MB). Picked
  with `file_picker`, fetched back through the API Server — never a public URL —
  and opened with the phone's own viewer via `open_filex`.
- **Charging** — mirrors the web `Charging.vue`, split into two tabs. **Public**
  is a discovery map with a demo session and nearby stations: presentational
  placeholders, because there is no public-charging API yet (same as the web).
  **Home** is not a placeholder. It lists the chargers you own — imported from a
  service you connected, the same move the garage makes for a car — and above
  them four cards about the one you picked: **control** (start/stop, a current
  limit, boost or reset depending on the transport), **connection** (which
  charger, and either its serial or its address on your network), **readings**
  (everything the charger reports over Modbus — per-phase power, its settings,
  what it is, and any alarm), and **information** (everything the record holds,
  with the service's live view of whether it is reachable). Control needs a mode
  picked under Settings → Integrations — Modbus TCP over the local network, or
  Own/Proxy CSMS over OCPP — but the information card stands without one.
  Each card folds away, remembered per device; the tabs and the cards rearrange
  from the ⇅ button in the app bar, and that arrangement is saved on your
  profile, so it follows the account the way the garage order does.
- **Settings** — account (name / email verification / password), appearance
  (theme + dark mode, **language**, **region**, date format, **currency**, font
  size), profile (avatar via `image_picker`, bio), **integrations** (Toyota,
  Anker Solix), **Security** (biometric toggle), **Organization** (create your
  own — which makes you its admin — or rename/delete the one you administer),
  **data export/import**, and the account-deletion state machine. Export writes
  the account JSON into the app's own documents directory and offers to open it;
  import picks a previously exported file and always creates new records, so it
  asks first, with the number of cars the file actually holds. Auth relays PocketBase's own stateless
  tokens, so there is no per-device session list to show or revoke.
- **Users (admin)** — user management tab (list / create / role / reset password
  / delete), shown only for the admin role. A blocked control says why rather
  than only greying out: long-press a locked role picker, and the overflow menu
  carries the reason under the action. Superadmins also choose which
  organization a new account lands in (or none at all); an admin gets no picker,
  because the server puts their members in their own organization regardless.

- **Android Auto** — the garage on the car's own screen, read-only: which car
  is overdue, and what it has coming. See *In the car* below.

Sharing/ownership: `Car.access` drives `isOwner` / `canWrite` / `isReadOnly`
getters that gate the UI, mirroring the server's access checks.

## Language, region & currency

Language and region are two pickers over the one stored BCP-47 tag (`en-US`), so
the pair can be mixed — English in Poland, say. Currency is display-only: nothing
is converted, so changing it reinterprets existing amounts rather than
recalculating them. All three lists mirror the API's (`validCurrencies` and the
locale pattern in `internal/api/me.go`), with two deliberate differences from the
web app:

- **Luxembourgish (`lb`) and Romansh (`rm`) are not offered.** `intl` ships no
  date/number symbols for them and *throws* rather than falling back, which would
  take out every date on screen. The browser has full ICU data behind it and has
  no such limit, so the web app can list them.
- **Labels are hand-kept** (endonyms for languages, English for regions and
  currencies) because Dart has no `Intl.DisplayNames`.

Because the server only validates a locale's *shape* (`^[a-z]{2}-[A-Z]{2}$`), a
tag the phone cannot render can still arrive from the web. `format.dart` resolves
through a supported-language check and falls back to `en-US` instead of throwing;
`test/models_format_test.dart` covers it.

Every screen reads its text from the language files, and `flutter test` fails if
a key exists in English but not in Polish or Danish. See
[TRANSLATIONS.md](../TRANSLATIONS.md).

## Biometric / face sign-in & app lock

Fingerprint and face-recognition sign-in via `local_auth`, with credentials kept
in Android Keystore–backed secure storage (`flutter_secure_storage`).

- After a successful password login the app offers to **enable biometric login**;
  the entered (known-good) credentials are stored securely.
- The login screen then shows **"Sign in with face recognition / fingerprint"**
  buttons (labels reflect the enrolled biometric kinds) and auto-prompts once.
  On success the stored credentials are replayed against the normal login API, so
  each biometric sign-in mints a fresh session. Stale credentials (e.g. after a
  password change) auto-disable biometric login.
- **App lock** — the token persists, so a valid session normally restores silently.
  When biometric login is enabled the app instead starts **locked** (and re-locks
  when backgrounded) and shows a lock screen requiring a biometric unlock. A
  **30-second grace period** means quick app-switches don't re-lock; a full app
  close (process kill) always locks on next launch. "Use password instead" on the
  lock screen logs out and returns to the login form.
- Manage it under **Settings → Security** (enabling re-confirms the password).

Android host requirements (already configured, don't revert):
`MainActivity` extends **`FlutterFragmentActivity`** (required by `local_auth`),
and `AndroidManifest.xml` declares `android.permission.USE_BIOMETRIC`.

## More than one server

Two sites, two full DriverVault stacks — and one app. The server picker is the
first button in the Garage header: it names the server you are reading right
now, and switches between them in a tap. With only one server known there is
nothing to pick between, so it goes straight to adding the second.

- **The home server** is the address this build ships with (`kDefaultApiBase`,
  overridable per-device from the login screen's **Server settings**). It is
  always in the list and can't be removed.
- **Any other server** is added by address — `https://garage.example.com`; the
  `/api` is appended for you if you leave the path off — and has to be reachable
  from wherever the phone is.
- **A session per server.** Each server is its own PocketBase with its own users,
  so a token can't be carried across: you sign into each one once, and after that
  switching needs no password. Sessions live in `SharedPreferences` under
  `cc_session_<id>`, the list under `cc_servers`, the active one under
  `cc_active_server`.
- **Switching rebuilds the shell**, because record ids belong to the server that
  issued them — the garage, the charging page and the settings all re-read from
  the one now active, and its owner's appearance prefs come with it.
- **An expiring remote session doesn't sign you out of the app**: that server's
  token is dropped, the app falls back to the home server, and the entry stays in
  the list to sign into again. Only *Log out* clears every server at once.

Upgrading from a single-server build carries what was there onto the home entry
— the saved session (`cc_token` / `cc_user`) and the address it was pointed at
(`cc_server_url`) — so nobody is signed out by the update.

## In the car — Android Auto

The same APK is an Android Auto app. Plug the phone in and DriverVault is on the
head unit: a **garage list**, one row per car with its due badge under the name,
and a tap opens what that car has coming — the odometer, the next service, and
the reminders the server holds for it, stored and auto-derived alike.

There is no Flutter engine on a head unit. The car screens are
[Car App Library](https://developer.android.com/training/cars/apps) templates the
host draws itself, written in Kotlin under
`android/app/src/main/kotlin/com/drivervault/phoneapp/car/`, and they take three
things from the phone app rather than growing their own:

- **The session.** `VaultStore` reads what the phone has already signed in with —
  the active server's base URL and its token — out of shared_preferences' own
  store, which both halves of the app share. Switch server on the phone and the
  car reads the new one; there is nothing to keep in step. A head unit is the
  last place to type a password, so if nothing is signed in the car says so and
  points at the phone. The one key added for this is `cc_active_base`, the
  *resolved* base URL: an untouched home entry carries no address of its own, its
  base being `kDefaultApiBase` — a compile-time define nothing outside Dart can
  read.
- **The words.** `CarStrings` reads the same `assets/i18n/{lang}.json` files, by
  the same dot-path keys, in the language the account chose. A due badge on the
  head unit is the string `lib/format.dart` puts on the phone, not a second
  translation of it. Only four keys are the car's own (`carApp.*`): what to say
  when nobody is signed in, when the token has been refused, when the server
  can't be reached, and the Refresh button.
- **The figures.** `CarFormat` is the twin of `lib/format.dart`: same date format
  and number grouping from the account's settings, same worst-of-date-and-km
  service badge, same wording for a reminder's status.

Two things are deliberately unlike the phone:

- **It only reads.** No car is edited, no odometer updated, no reminder marked
  done. A screen you cannot type into is a poor place to edit a car and a driver
  is a poor person to ask, so `VaultApi` has no write in it to reach for by
  accident.
- **Worst first.** The host shows only the first few rows of any list, so the
  garage is sorted by badge rather than kept in the phone's order — the car this
  list exists to mention is the overdue one, not whichever was added first.

One thing to know before turning it on: **the app lock does not reach the head
unit.** Biometric login keeps the phone's own UI behind a fingerprint (see above),
but that flag lives in memory and the credentials behind it in encrypted storage,
neither of which the car service can read — and a head unit has no fingerprint
reader to satisfy it with anyway. So a phone that is paired to a car shows the
garage there, read-only, whether or not the phone itself is locked. Everything on
those screens is maintenance data, and the phone still has to be the one plugged
in, but it is the one place the lock stops short.

Running it on your own car:

- The service is declared under `androidx.car.app.category.IOT`. It is the
  closest of the categories the library defines — DriverVault is a garage, not a
  map, a media player or a parking service — and a Play Store submission would
  be reviewed against it. This build is sideloaded, so what matters instead is
  the next line.
- Android Auto refuses apps it did not get from the Play Store until you tell it
  otherwise: in the **Android Auto** settings on the phone, tap the version ten
  times to unlock **Developer settings**, then turn on **Unknown sources**.
- To try it without a car, run Google's
  [Desktop Head Unit](https://developer.android.com/training/cars/testing/dhu).
  A debug build accepts any host so the DHU can connect; a release build only
  accepts the signed hosts the library ships an allowlist for.

## Configure the API endpoint

The app talks to `kDefaultApiBase` (see `lib/config.dart`), default
`http://localhost:8080/api`. Override at build time with `--dart-define`, or at
runtime from the login screen's **Server settings**, which edits the address of
the active server — on a fresh install, the home one (persisted in `cc_servers`).

## Run & build

```bash
flutter pub get

# run on a connected device against a LAN server
flutter run -d <device> --dart-define=API_BASE=http://10.2.1.101:8080/api

# build a debug APK for a real phone on the LAN
flutter build apk --debug --dart-define=API_BASE=http://10.2.1.101:8080/api
adb install -r build/app/outputs/flutter-apk/app-debug.apk
adb shell monkey -p com.drivervault.phoneapp -c android.intent.category.LAUNCHER 1
```

Notes:
- `android/gradle.properties` sets `kotlin.incremental=false` — required because
  the project lives on drive `E:` while Gradle/Kotlin caches are on `C:` (the
  incremental compiler can't compute cross-root relative paths on Windows).
- `AndroidManifest.xml` sets `android:usesCleartextTraffic="true"` because the API
  base is a plain-HTTP LAN URL.
- The API Server must be running and reachable at the configured URL.

## Structure

```
lib/
├── config.dart        # default API base URL (kDefaultApiBase)
├── models.dart        # Car (+ access getters), the record types, integrations, profile
├── api.dart           # ApiClient — the only thing that calls the API Server
├── auth.dart          # AuthService — the active server's session, app-lock flag
├── servers.dart       # ServerRegistry — the servers, their sessions, the active one
├── biometric.dart     # BiometricAuth — local_auth + secure storage; biometricAuth singleton
├── app_settings.dart  # AppSettings (theme/locale/date/font), persisted; drives MaterialApp
├── i18n.dart          # translation lookup — t("key"); en/pl/da with en fallback
├── theme.dart         # shared colours/tones (status badges, charging tiles)
├── format.dart        # date/km formatting + next-service status (worst-of date/km)
├── service_parts.dart # the parts a service can change, in one list
├── main.dart          # app root; routes Login / Lock / RootShell; lifecycle re-lock
├── widgets/
│   └── attachment_field.dart   # pick / view / clear a record's attached file
└── screens/
    ├── root_shell.dart         # bottom-nav shell: Garage, Charging, Settings, Users
    ├── login_screen.dart       lock_screen.dart        dashboard_screen.dart
    ├── car_detail_screen.dart  car_form_sheet.dart     record_form_sheets.dart
    ├── car_view_sheet.dart     # which tabs/rows/columns a car shows + the catalogues
    ├── provider_tab.dart       # the connected-service tab (MyToyota)
    ├── servers_sheet.dart      # the server picker + the add / edit / sign-in sheet
    ├── charger_import_sheet.dart  # a charger on a connected service becomes yours
    └── charging_screen.dart    settings_screen.dart    admin_users_screen.dart
```

The Android Auto half is Kotlin, because the head unit draws its own templates:

```
android/app/src/main/kotlin/com/drivervault/phoneapp/
├── MainActivity.kt              # the Flutter host (FlutterFragmentActivity, for local_auth)
└── car/
    ├── DriverVaultCarAppService.kt  # what Android Auto binds to; the root screen + host validator
    ├── VaultStore.kt            # the phone's session, read from shared_preferences' own store
    ├── VaultApi.kt              # the reads the car screens make — no writes exist here
    ├── CarStrings.kt            # t("key") over the bundled assets/i18n files
    ├── CarFormat.kt             # dates, km and the due badges — the twin of lib/format.dart
    ├── VaultScreen.kt           # load / loading / failed-with-a-Refresh, shared by both screens
    ├── GarageScreen.kt          # the cars, worst badge first
    └── CarDueScreen.kt          # one car: odometer, next service, reminders
```