FROM python:3.10-slim

# Set working directory
WORKDIR /app

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

# Copy requirements first for better layer caching
COPY requirements.txt .

# Install Python dependencies
# Install CPU-only PyTorch to reduce image size for HuggingFace Spaces
RUN pip install --no-cache-dir torch torchvision --index-url https://download.pytorch.org/whl/cpu
RUN pip install --no-cache-dir fastapi uvicorn safetensors Pillow numpy python-multipart packaging

# Copy application files
COPY app.py .
COPY ResNet50_S1_best.safetensors .
COPY ResNet50_S2_best.safetensors .
COPY ResNet50_S3_best.safetensors .

# Expose port
EXPOSE 7860

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD curl -f http://localhost:7860/ || exit 1

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