FROM python:3.11-slim

# Prevent Python from writing .pyc files and ensure stdout/stderr are unbuffered
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1

# Install system dependencies (ffmpeg for media handling, curl for health/debug)
RUN apt-get update && apt-get install -y --no-install-recommends \
    ffmpeg \
    curl \
    ca-certificates \
 && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Install Python dependencies first for better layer caching
COPY requirements.txt /app/requirements.txt
RUN pip install --upgrade pip && pip install -r /app/requirements.txt

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

# Default envs (override via compose/.env)
ENV TZ=Asia/Shanghai \
    PYTHONPATH=/app

# Default command is a no-op; each service overrides with its own command
CMD ["python", "-V"]