# Use a specific Python 3.9 slim image
FROM python:3.9-slim

# Install system dependencies (as root, before creating the non-root user)
RUN apt-get update && apt-get install -y \
    build-essential \
    curl \
    software-properties-common \
    git \
    libgomp1 \
    && rm -rf /var/lib/apt/lists/*

# Create a non-root user "appuser" with UID 1000 (as expected by HF Spaces)
# and create its home directory.
RUN useradd -m -u 1000 appuser

# Switch to the non-root user "appuser"
USER appuser

# Set environment variables for the "appuser"
# HOME is crucial for tools like pip and streamlit to find user-specific paths
ENV HOME=/home/appuser
# Add user's local bin to PATH (where pip --user installs scripts)
ENV PATH="$HOME/.local/bin:$PATH"
# Set Hugging Face cache to be within the user's home directory
ENV HF_HOME="$HOME/.cache/huggingface" \
    STREAMLIT_SERVER_HEADLESS="true" \
    STREAMLIT_BROWSER_GATHERUSAGSTATS="false" \
    STREAMLIT_GLOBAL_GATHERUSAGSTATS="false" \
    PYTHONUNBUFFERED=1

# Set the working directory inside the user's home
# All subsequent COPY and RUN commands will be relative to this
WORKDIR $HOME/app

# Copy requirements.txt first and install dependencies as "appuser"
# --chown=appuser:appuser ensures the copied file is owned by appuser
COPY --chown=appuser:appuser requirements.txt ./
# Pip will install packages to user's site-packages (e.g., $HOME/.local/lib/python3.9/site-packages)
RUN pip install --no-cache-dir -r requirements.txt

# Copy the application source code into the WORKDIR
# Ensure your streamlit_app.py is in a 'src' folder at the root of your build context
# e.g., your project structure is:
# .
# ├── Dockerfile
# ├── requirements.txt
# └── src/
#     └── streamlit_app.py
COPY --chown=appuser:appuser src/ ./src/
# If your streamlit_app.py is at the root of your project (next to Dockerfile):
# COPY --chown=appuser:appuser streamlit_app.py ./streamlit_app.py

# Expose the port Streamlit will run on
EXPOSE 8501

# Healthcheck (Streamlit's health endpoint)
HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health

# Command to run the Streamlit application
# Ensure the path to your script is correct relative to WORKDIR ($HOME/app)
# If streamlit_app.py is in $HOME/app/src/streamlit_app.py:
ENTRYPOINT ["streamlit", "run", "src/streamlit_app.py", "--server.port=8501", "--server.address=0.0.0.0"]
# If streamlit_app.py is in $HOME/app/streamlit_app.py (if you changed the COPY above):
# ENTRYPOINT ["streamlit", "run", "streamlit_app.py", "--server.port=8501", "--server.address=0.0.0.0"]