# 多阶段构建：构建阶段
FROM python:3.11-slim AS builder

# 设置工作目录
WORKDIR /app

# 安装系统依赖
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# 复制 requirements.txt
COPY requirements.txt .

# 创建虚拟环境并安装依赖
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
RUN pip install --upgrade pip setuptools wheel && \
    pip install --no-cache-dir -r requirements.txt

# 最终运行阶段
FROM python:3.11-slim

# 设置工作目录
WORKDIR /app

# 设置环境变量
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PATH="/opt/venv/bin:$PATH"

# 从构建阶段复制虚拟环境
COPY --from=builder /opt/venv /opt/venv

# 复制应用代码
COPY . .

# 暴露端口
EXPOSE 8000

# 启动命令
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]