# Stage 1: builder — compiles Python packages that need gcc
FROM python:3.12-slim AS builder

WORKDIR /build

RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

COPY requirements.txt .
RUN pip install --no-cache-dir --prefix=/install -r requirements.txt

# Stage 2: runtime — lean image with only what the app needs at runtime
FROM python:3.12-slim AS runtime

RUN apt-get update \
    && apt-get upgrade -y --no-install-recommends \
    && apt-get install -y --no-install-recommends \
        tesseract-ocr \
        libgl1 \
        libglib2.0-0 \
    && rm -rf /var/lib/apt/lists/*

COPY --from=builder /install /usr/local

RUN groupadd --gid 1000 appgroup \
    && useradd --uid 1000 --gid appgroup --shell /bin/sh --no-create-home appuser

WORKDIR /app
COPY --chown=appuser:appgroup . .

USER appuser

EXPOSE 8000

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