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FROM python:3.13.5-slim

# Set working directory
WORKDIR /app

# Install system dependencies (for building Python packages)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    python3-dev \
    curl \
    git \
    && rm -rf /var/lib/apt/lists/*

# Upgrade pip first
RUN pip install --no-cache-dir --upgrade pip setuptools wheel

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

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

# Copy app source code
COPY src/ ./src/

# Expose Streamlit default port
EXPOSE 8501

# Healthcheck (give Streamlit time to boot)
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
  CMD curl --fail http://localhost:8501/_stcore/health || exit 1

# Run as non-root user for security (optional but good practice)
RUN useradd -m streamlit
USER streamlit

# Entrypoint to run Streamlit app
ENTRYPOINT ["streamlit", "run", "src/streamlit_app.py", "--server.port=8501", "--server.address=0.0.0.0"]