FROM python:3.10-slim

# Set working directory
WORKDIR /app

# Create a non-root user
RUN useradd -m -u 1000 appuser

# Install system dependencies
RUN apt-get update && apt-get install -y \
    curl \
    gcc \
    python3-dev \
    libpython3-dev \
    && rm -rf /var/lib/apt/lists/*

# Set up cache directory for Hugging Face
ENV HF_HOME=/app/.cache/huggingface
RUN mkdir -p /app/.cache/huggingface && \
    chown -R appuser:appuser /app

# Copy only necessary files
COPY --chown=appuser:appuser requirements.txt ./
COPY --chown=appuser:appuser app/ ./app/
COPY --chown=appuser:appuser README.md ./

# Switch to non-root user
USER appuser

# Install dependencies
ENV PATH="/home/appuser/.local/bin:${PATH}"
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir --verbose torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu && \
    pip install --no-cache-dir -r requirements.txt && \
    pip install --no-cache-dir uvicorn

# Expose default dev port
EXPOSE 7860

# Healthcheck
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
  CMD curl --fail http://localhost:${PORT:-7860} || exit 1

# Start app (use HF-provided PORT if set)
CMD uvicorn app.app:app --host 0.0.0.0 --port ${PORT:-7860}