FROM python:3.10-slim

# Prevent Python from writing pyc files
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

WORKDIR /app

# Install system dependencies (required for sklearn / xgboost)
RUN apt-get update && apt-get install -y \
    build-essential \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Copy and install dependencies first (better caching)
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY . .

# Hugging Face expects port 7860
EXPOSE 7860

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