# Backend image — FastAPI + SQLAlchemy async (asyncpg)
# The PostgreSQL schema is managed by the postgres service (migration.sql +
# seed.sql init scripts); this image only runs the API.
FROM python:3.13-slim

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1

WORKDIR /srv/backend

# Dependencies first (layer caching)
# PIP_INDEX_URL overridable (e.g. a China mirror) — default is official PyPI.
ARG PIP_INDEX_URL=https://pypi.org/simple
COPY requirements.txt .
RUN pip install --no-cache-dir -i ${PIP_INDEX_URL} -r requirements.txt

# Application
COPY app ./app
COPY tools ./tools

EXPOSE 8000

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]