# eg4-battery daemon — containerized.
#
# Build:   docker build -t eg4-battery .
# Run:     see docker-compose.yml for device passthrough + config mount
#
# Design notes:
#   - Same Python source (bin/eg4-battery) used in both systemd and Docker
#     deployments. PEP-723 inline deps are ignored when run with `python` directly,
#     so they're harmless. Container deps come from requirements.txt.
#   - Config is mounted at /config/eg4-battery.yaml (read-only). MQTT
#     credentials can be overridden via env vars (see env-override block in
#     bin/eg4-battery's main()), making them suitable for Docker secrets or
#     HA-addon options translation.
#   - Logs go to stdout (Python logging defaults work — `docker logs` captures).

FROM python:3.11-slim AS base

# pyserial wants the native serial-port permissions to "just work" inside
# the container; we hand the device through via docker-compose `devices:`.
# No extra system packages needed.

WORKDIR /app

# --- Python deps --------------------------------------------------------
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# --- daemon source ------------------------------------------------------
COPY bin/eg4-battery /app/eg4-battery
RUN chmod +x /app/eg4-battery

# --- runtime ------------------------------------------------------------
# Config volume mount expected at /config (read-only); see compose file.
VOLUME ["/config"]

# Run as the daemon's main entrypoint. We exec via `python` so the PEP-723
# shebang isn't invoked (uv isn't in this image).
ENTRYPOINT ["python", "/app/eg4-battery", "-C", "/config/eg4-battery.yaml"]