jtube-tv/AGENTS.md

# AGENTS.md — guidance for AI agents working on JTube TV

Read this before making changes. The project is an Android TV app (Kotlin, Compose
for TV) that talks to a PeerTube instance over its REST API v1.

## Environment facts

- Host is Arch Linux. The Android SDK the build actually uses is `/opt/android-sdk`
  (`ANDROID_SDK_ROOT` — note `local.properties`' `sdk.dir` points to the outdated
  `~/Android/Sdk`, which doesn't exist; platforms 34/35/36, build-tools).
- Emulator testing (host emulator + agent container over adb): see
  `docs/agent-container.md` — covers start script, ports, and what to reinstall
  after a container rebuild.
- The Gradle wrapper is checked in (`gradlew` + `gradle/wrapper/`), so builds need only a
  JDK 17+ (`java`) on PATH. If `java` is missing, tell the user — do not install things on
  the host without asking.
- Useful commands:
  - `./gradlew :app:assembleDebug` — build debug APK
  - `./gradlew :app:lintDebug` — lint
  - `adb connect <ip>:<port>` + `adb install -r app/build/outputs/apk/debug/app-debug.apk`
- This repo is local-only for now. If it gets a remote on git.jeena.net later, set the
  repo-local deploy key pin right away:
  `git config core.sshCommand "ssh -i ~/.ssh/agent-deploy-key -o IdentitiesOnly=yes"`

## Project layout

```
app/src/main/java/net/jeena/jtubetv/
  JTubeApp.kt              Application + AppGraph service locator (no DI framework)
  MainActivity.kt          single activity, session state → Setup or Home
  data/api/PeerTubeApi.kt  Retrofit endpoints
  data/api/Dtos.kt         kotlinx-serialization models (ignoreUnknownKeys everywhere)
  data/auth/TokenStore.kt  EncryptedSharedPreferences (baseUrl, username, tokens, client creds)
  data/network/Network.kt  Retrofit/OkHttp: BaseUrlInterceptor, AuthInterceptor,
                           TokenAuthenticator (single-flight refresh)
  data/PeerTubeRepository.kt  all suspend functions used by UI
  ui/theme/Theme.kt        Compose for TV theme
  ui/screens/…             SetupScreen, HomeScreen, VideoListScreen (modes), ChannelsScreen, PlayerScreen
  ui/list/…                VideoListViewModel + PagedList state helper
  ui/player/…
```

State flow: `MainActivity` observes `AppViewModel.sessionState`; `NeedsSetup` renders the
setup/login screen, `Ready` renders `HomeScreen`, which switches content on a
`Destination` enum. The player pushes a video onto a state and uses a `BackHandler`.

## PeerTube API notes (verified 2026-10-10 against tube.jeena.net, v8.3.1)

- OAuth: `GET /api/v1/oauth-clients/local` → client_id/client_secret;
  `POST /api/v1/users/token` (form: grant_type=password) → access_token + refresh_token.
  Access tokens expire (~24h); refresh with grant_type=refresh_token. We never persist
  the user's password.
- Pagination shape: `GET …?start=&count=&sort=` → `{ total, data: [...] }`.
  Sort `-publishedAt`; page size 25; infinite scroll by issuing the next page when the
  list is 5 items from the end.
- Public/local videos listing, search, channels: unauthenticated endpoints work —
  - `GET /api/v1/videos?isLocal=true&search=`
  - `GET /api/v1/video-channels?search=…&searchTarget=local` (local channels only)
- Authenticated (`Bearer` header):
  - `GET /api/v1/users/me/videos` — own videos, ALL privacy levels
  - `GET /api/v1/users/me/subscriptions/videos` and `users/me/history/videos` return
    the standard `{ total, data: [...] }` wrapper (verified live); history items are
    plain video objects — **`lastViewedAt` is NOT returned** (don't rely on it)
  - `GET /api/v1/accounts/{accountName}/video-channels`
  - `POST /api/v1/videos/{shortUuid}/watching` JSON body `{ "currentTime": <seconds> }`
    → HTTP 204 (verified). This is what populates server-side history AND the stored
    playback position. Report every ~20 s of wall-clock playback once currentTime ≥ 5 s.
  - Resume-from-server possible via `GET /api/v1/videos/{shortUuid}?userHistory=true`
    → `userHistory: { currentTime, currentPercent }` (verified)
  - `GET /api/v1/videos/{shortUuid}` for playback URLs: prefer
    `streamingPlaylists[].playlistUrl` (HLS) else `files[].fileUrl`.
  - Private/internal media: attach `Authorization: Bearer` to playlist, segment and file
    requests (configured on the Media3 `HttpDataSource.Factory`) AND — for instances
    whose media lives in a private object-storage bucket — pass the short-lived
    `POST /api/v1/videos/{shortUuid}/token` token as `?videoFileToken=` on those URLs
    (response shape: `{ files: { token, expires } }`; verified live).
  - Some instances stream non-public media from object-storage hosts with only
    URL-based access control — never rely on that; always request and use the
    file token for non-public videos. (Instance-specific findings stay out of
    the public repo and live in the private ops notes/agent-local instructions.)

## Conventions

- Kotlin + coroutines; suspend functions in the repository, `runCatching` → `Result<T>`
  at repository boundaries; view models expose `StateFlow`.
- No Dagger/Hilt/Room — keep the dependency surface small; revise only if it earns its keep.
- kotlinx-serialization for JSON; DTOs must use `ignoreUnknownKeys` so new PeerTube
  fields never crash parsing.
- Compose for TV (`androidx.tv:tv-material`) for sidebar/cards; make list items
  focusable + clickable so D-pad navigation works.
- Package prefix `net.jeena.jtubetv`. Keep files focused; don't grow `MainActivity`.
- minSdk 26 / target+compile 35; versions are pinned in `gradle/libs.versions.toml`.

## Scope discipline

v0.1 features live in `README.md`; everything else in `BACKLOG.md`. Do not sneak in
uploading, editing, subscriptions management, deletion or content creation — the user
explicitly excluded them. If the user asks for a scope change, update `BACKLOG.md`
first, then implement.

When unsure how a PeerTube endpoint behaves, verify against the live instance instead of
guessing (401 ⇒ exists & needs auth, 404 ⇒ route missing, 405 ⇒ wrong method on real route).