FROM python:3.9-slim

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Create non-root user for Hugging Face Spaces
RUN useradd -m -u 1000 user
USER user
ENV PATH="/home/user/.local/bin:$PATH"

WORKDIR /app

# Copy requirements first for better caching
COPY --chown=user ./requirements.txt requirements.txt
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy application code and models
COPY --chown=user . /app

# Verify critical files exist (helps debug if files are missing)
RUN ls -la /app/*.py && \
    test -f /app/app.py || (echo "ERROR: app.py not found!" && exit 1) && \
    test -f /app/preprocessing.py || (echo "ERROR: preprocessing.py not found!" && exit 1) && \
    test -f /app/model_utils.py || (echo "ERROR: model_utils.py not found!" && exit 1) && \
    echo "All required Python files found!"

# Ensure models directory exists (models should be committed to repo)
RUN mkdir -p /app/models /app/data

# Health check (port 7860 for Hugging Face Spaces)
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:7860/health', timeout=5)" || exit 1

# Expose port 7860 (Hugging Face Spaces default)
EXPOSE 7860

# Run FastAPI application
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]