# ============== Stage 1: Builder ==============
FROM python:3.12-slim AS builder
WORKDIR /app
ENV PYTHONUNBUFFERED=1 \
    PIP_INDEX_URL=https://mirrors.aliyun.com/pypi/simple/ \
    PIP_TRUSTED_HOST=mirrors.aliyun.com

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

# Install Python dependencies
COPY requirements.txt ./
RUN python -m pip install --upgrade pip setuptools wheel && \
    pip install --no-cache-dir --default-timeout=120 --retries 10 -r requirements.txt

# ============== Stage 2: Production ==============
FROM python:3.12-slim AS production
WORKDIR /app
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PIP_NO_CACHE_DIR=1

# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommends \
    libpq5 \
    && rm -rf /var/lib/apt/lists/*

# Copy installed packages from builder
COPY --from=builder /usr/local/lib/python3.12/site-packages /usr/local/lib/python3.12/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin

# Copy application code
ENV PYTHONPATH=/app
COPY apps/api /app/apps/api
COPY packages /app/packages
COPY scripts /app/scripts
COPY alembic /app/alembic
COPY alembic.ini /app/alembic.ini

WORKDIR /app/apps/api
EXPOSE 8000

# Run as non-root user for security
RUN useradd --create-home --shell /bin/bash appuser && \
    chown -R appuser:appuser /app
USER appuser

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]