DOCKERFILE

FROM python:3.11-slim as builder

# Install build dependencies
RUN apt-get update && apt-get install -y \
    gcc libpq-dev && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY requirements.txt .
RUN pip install --user --no-cache-dir -r requirements.txt

# Final stage
FROM python:3.11-slim
WORKDIR /app

# Copy only necessary files from builder
COPY --from=builder /root/.local /root/.local
COPY . .

# Ensure scripts in .local are usable
ENV PATH=/root/.local/bin:$PATH
ENV PYTHONPATH=/app

# Runtime environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    FLASK_APP=main.py \
    FLASK_ENV=production

EXPOSE 5000

# Use gunicorn for production
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "4", "main:app"]