FROM python:3.11-slim

WORKDIR /app

# Install system dependencies needed for compiling C extensions (psycopg2, pillow, reportlab)
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    libpq-dev \
    libjpeg-dev \
    zlib1g-dev \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements and install
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy backend application code
COPY . .

# Collect static files
RUN python manage.py collectstatic --noinput || true

EXPOSE 8000

CMD ["gunicorn", "--bind", "0.0.0.0:8000", "--workers", "3", "shiftplan_backend.wsgi:application"]