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# =============================================
# Stage 1: Builder
# =============================================
FROM python:3.11-slim AS builder

WORKDIR /app

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Copy and install Python deps
COPY requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

# =============================================
# Stage 2: Final Runtime
# =============================================
FROM python:3.11-slim

WORKDIR /app

# Copy installed packages from builder
COPY --from=builder /root/.local /root/.local
ENV PATH=/root/.local/bin:$PATH

# Copy app
COPY main.py .

# Enable unbuffered output
ENV PYTHONUNBUFFERED=1

# Expose FastAPI port
EXPOSE 8000

# =============================================
# Auto-detect CPU cores and set Uvicorn workers
# =============================================
CMD ["sh", "-c", "uvicorn main:app --host 0.0.0.0 --port 8000 --workers $(( $(nproc) * 2 ))"]