FROM python:3.10-slim

# Set working directory
WORKDIR /app

# Install system dependencies needed for torch
RUN apt-get update && apt-get install -y \
    gcc \
    g++ \
    && rm -rf /var/lib/apt/lists/*

# Copy and install Python dependencies first
# (Docker layer caching — only re-runs if requirements.txt changes)
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY . .

# HuggingFace Spaces expects port 7860
EXPOSE 7860

# Start FastAPI with uvicorn
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]