FROM python:3.11-slim

# 运行时基础环境
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1

WORKDIR /app

# 系统依赖（按需扩展；多数依赖为纯 Python）
RUN apt-get update \
    && apt-get install -y --no-install-recommends build-essential curl \
    && rm -rf /var/lib/apt/lists/*

# 先复制依赖清单以利用 Docker layer cache
COPY requirements.txt /app/requirements.txt
RUN python -m pip install -U pip \
    && pip install --no-cache-dir -r /app/requirements.txt

# 复制后端代码与迁移配置
COPY app /app/app
COPY alembic /app/alembic
COPY alembic.ini /app/alembic.ini

EXPOSE 8000

# 生产镜像默认不开启 reload
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]