# Use lightweight Python image
FROM python:3.12-slim

# Prevent Python from writing .pyc files and buffering output
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Set the working directory
WORKDIR /app

# Install system dependencies required by numpy, pandas, shap
RUN apt-get update && \
    apt-get install -y --no-install-recommends \
    build-essential \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first to leverage Docker layer caching
COPY requirements.txt .

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

# Copy application code and model
COPY . .

# Expose Hugging Face default port
EXPOSE 7860

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