########################  builder stage  ########################
FROM python:3.9-slim AS builder
WORKDIR /build

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

# --- copy source and compile to byte-code ---
COPY app.py .
RUN python -m compileall -b -f app.py        # produces /build/app.pyc

# --- pack the .pyc into a gzip tarball ---
RUN tar -C /build -czf /build/app.tgz app.pyc

########################  runtime stage  ########################
FROM python:3.9-slim
WORKDIR /app

# 1) bring in site-packages from builder
COPY --from=builder /install /usr/local/

# 2) bring in the compressed payload only
COPY --from=builder /build/app.tgz ./app.tgz

# 3) entry-point that unpacks → runs → deletes
COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

EXPOSE 7860
ENTRYPOINT ["/entrypoint.sh"]