FROM python:3.9-slim

# Segurança
RUN useradd -m -u 1000 user
USER user
ENV PATH="/home/user/.local/bin:$PATH"

WORKDIR /app

# Copia arquivos de dependência
COPY --chown=user requirements.txt constraints.txt ./

# Atualiza pip e instala SEM backtracking
RUN pip install --upgrade pip && \
    pip install --no-cache-dir \
    -r requirements.txt \
    -c constraints.txt

# Copia o código
COPY --chown=user . /app

# FastAPI no padrão HF
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]