# Use a lightweight Python base
FROM python:3.12-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Set work directory
WORKDIR /app

# Install system dependencies (if needed for pip packages)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first (for caching)
COPY requirements.txt /app/

# Install Python dependencies
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the app
COPY . /app/

# Expose Flask port
EXPOSE 5000

# Default env vars (can override at runtime)
ENV FLASK_APP=app:create_app
ENV FLASK_RUN_HOST=0.0.0.0
ENV FLASK_RUN_PORT=5000
ENV FLASK_ENV=production

# Start Flask with Gunicorn (better for prod than flask run)
CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:5000", "app:create_app()"]