# lightweight Python 3.11 base image
FROM python:3.11-slim

# prevent .pyc files, enable real-time logs, disable pip cache, and set app port
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PORT=7860

# set the container working directory
WORKDIR /app

# install system packages and remove package cache
RUN apt-get update \
    && apt-get install -y --no-install-recommends libgomp1 curl \
    && rm -rf /var/lib/apt/lists/*

# copy dependency definitions into the container
COPY requirements.txt .

# upgrade pip and install Python dependencies
RUN pip install --upgrade pip && pip install -r requirements.txt

# copy the application source code
COPY . .

# document the port used by the application
EXPOSE 7860

# check that the application is responding correctly
HEALTHCHECK --interval=30s --timeout=5s --start-period=90s --retries=3 \
  CMD curl -fsS http://localhost:7860/ >/dev/null || exit 1

# start app
CMD ["python", "app.py"]