# LedGrab TODO

## Android — Restore Multi-ABI Wheels

During emulator testing, we switched the build to **x86 only** (see `android/app/build.gradle.kts` `abiFilters`) to avoid having to keep the arm64-v8a / x86_64 pydantic-core wheels current. Before shipping, restore all three ABIs:

- [x] Rebuild `pydantic-core` wheels for all three ABIs with the current SOABI + libpython linking settings (`android/build-scripts/build-pydantic-core.sh` — now supports `arm64`, `x86_64`, `x86` args; defaults to all three).
- [x] Verify wheels: all three now list `libpython3.11.so` in `NEEDED` (`llvm-readelf -d`), automated in the build script.
- [x] Restored `abiFilters += listOf("arm64-v8a", "x86_64", "x86")` in `build.gradle.kts`. Multi-ABI debug APK builds cleanly (~99 MB).
- [ ] Re-test on real ARM64 Android TV hardware (still pending — only emulator-verified build).

Build cache + scripts live in `android/build-scripts/` and `android/.build-cache/` (junction host + sysconfigdata for each ABI).

## Android CI Pipeline

Build the Android APK automatically on push/tag.

- [x] Generate Gradle wrapper (`gradlew`) and commit it
- [x] Create CI workflow (`.gitea/workflows/build-android.yml`)
  - JDK 17 + Android SDK + NDK setup
  - Python 3.11 for Chaquopy build
  - Recreate the directory junction via `ln -s` on Linux CI
  - `./gradlew assembleDebug` on master push, `assembleRelease` on `v*` tags (if signing secrets set)
  - Uploads APK as CI artifact; attaches to Gitea release on tag push
- [x] Commit pre-built pydantic-core wheels to `android/wheels/` (arm64, x86, x86_64)
- [x] APK signing for release builds — conditional signing config reads keystore from env vars (`ANDROID_KEYSTORE_PATH/_PASSWORD/_ALIAS/_KEY_PASSWORD`), falls back to debug signing locally
- [ ] Provision a real keystore and add the four CI secrets:
  - `ANDROID_KEYSTORE_BASE64` (base64-encoded .jks)
  - `ANDROID_KEYSTORE_PASSWORD`
  - `ANDROID_KEY_ALIAS`
  - `ANDROID_KEY_PASSWORD`
- [ ] Add `LedGrab-{tag}-android-release.apk` row to the release description table in `.gitea/workflows/release.yml` → `create-release` job
- [ ] Verify the CI workflow passes end-to-end with the now-restored multi-ABI build (larger APK, longer Android build step)

## Android Root Capture (No Permission Dialog, No System Indicator)

MediaProjection shows a mandatory system overlay/indicator while capturing — unavoidable on stock Android. Many cheap Android TV boxes ship pre-rooted, so an alternative root-only path would give much better UX.

- [ ] Detect root at runtime: check for `su` binary, `Superuser.apk`, etc.
- [ ] Implement `SurfaceControlCaptureEngine` (new capture engine) using hidden `SurfaceControl.screenshot()` API via reflection
  - No permission dialog
  - No system capture indicator
  - Direct bitmap output (no encoder/decoder roundtrip)
- [ ] Engine priority: higher than MediaProjection when root detected
- [ ] Fallback chain: `SurfaceControl` (root) → `MediaProjection` (stock) → `adb screencap` (last resort)
- [ ] Handle Android version differences in `SurfaceControl` API surface (renamed/moved across API 29, 30, 33)
- [ ] Alternative: shell out to `screenrecord --output-format=h264 -` as root (same H.264 decode as scrcpy_client_engine, but local instead of remote ADB)

Known projects using this approach for reference: scrcpy-hidden-api, shizuku, commercial scrcpy-derived apps.

## Android USB Serial Support

Drive USB LED controllers (APA102, WS2812) connected directly to the Android TV box via USB-to-serial adapters.

- [x] Added `com.github.mik3y:usb-serial-for-android:3.8.1` (via JitPack) to `android/app/build.gradle.kts`.
- [x] Kotlin `UsbSerialBridge` singleton (`android/app/src/main/java/com/ledgrab/android/UsbSerialBridge.kt`) — exposes `listDevices()`, `open(vid, pid, serial, baud)`, `write(handle, ByteArray)`, `close(handle)`. Permission request fires automatically from `open()` when the user hasn't granted access yet. Handles are opaque integers, port map is synchronized, so Python threads can share one bridge.
- [x] Python `AndroidSerialTransport` in `server/src/ledgrab/core/devices/android_serial_transport.py` drives the bridge through Chaquopy. `SerialTransport` Protocol + `PySerialTransport` + `list_serial_ports()` factory live in `serial_transport.py`; `AdalightClient` and `SerialDeviceProvider` now go through the abstraction instead of importing `pyserial` directly.
- [x] URL scheme extended: `usb:VID:PID[:serial][@baud]` on Android alongside the existing `COM3[:baud]` / `/dev/ttyUSB0[:baud]` desktop paths.
- [x] App initializes the bridge on startup (`LedGrabApp.onCreate` → `UsbSerialBridge.init(this)`); manifest declares `uses-feature android.hardware.usb.host`.
- [ ] Real-device test pending — no USB-serial hardware on dev machine. Need to verify on a TV box with CH340, CP2102, or FTDI adapter.
- [ ] Document supported USB LED controllers in README (once real-device test passes).
- [ ] Optional: auto-launch the app when a known USB-serial adapter is plugged in (intent-filter on `USB_DEVICE_ATTACHED` + `res/xml/device_filter.xml`). Skipped in v1 — users can just open LedGrab and hit "Discover".
- [ ] ESP-NOW client (`espnow_client.py` / `espnow_provider.py`) still imports `pyserial` directly and needs bidirectional reads — separate refactor to extend the transport with `read()` if ESP-NOW-via-USB on Android is needed.

## Performance Metrics Abstraction

- [x] `MetricsProvider` protocol + dataclass DTOs (`MemorySnapshot`, `ProcessSnapshot`) live in `server/src/ledgrab/utils/metrics/types.py`. Each provider has its own module: `psutil_provider.py`, `null_provider.py`, `android_provider.py`.
- [x] Factory `get_metrics_provider()` in `utils/metrics/__init__.py` selects Android → psutil → Null. `psutil` import is now confined to one place.
- [x] `api/routes/system.py` and `core/processing/metrics_history.py` use the provider; no more `if psutil is not None` guards in the hot paths.
- [x] Android `/proc`-backed provider implemented (`/proc/stat`, `/proc/meminfo`, `/proc/self/stat`, `/proc/self/status`). Carries previous-sample state for delta-based CPU%; degrades to zeros if any `/proc` file is locked down. 12 unit tests cover both desktop and Android paths.

## Android Performance Metrics — Future Enhancements

Beyond the `/proc`-based AndroidMetricsProvider that's now in place:

- [x] Device battery + thermal-zone readings (`/sys/class/power_supply/battery/{capacity,temp}`, `/sys/class/thermal/thermal_zone*/temp` filtered by zone type). Surfaced through `MetricsProvider.thermals()`, `PerformanceResponse.{cpu_temp_c,battery_percent,battery_temp_c}`, the metrics-history snapshot, and a new dashboard temperature chart that hides itself when the backend reports null. GPU card now hides (no "unavailable" placeholder) when no GPU is present.
- [WONTDO] Optional: app-specific memory via `Debug.getMemoryInfo()` through a Kotlin → Python Chaquopy bridge (more accurate than `VmRSS` for split-app-process accounting)
- [WONTDO] Optional: GPU usage via `/sys/class/kgsl/kgsl-3d0/gpubusy` on Adreno, Mali-specific paths for Mali GPUs