# syntax=docker/dockerfile:1
# 国内拉基础镜像慢时：docker compose build --build-arg PY_BASE=docker.m.daocloud.io/library/python:3.11-slim
ARG PY_BASE=python:3.11-slim
FROM ${PY_BASE}

WORKDIR /app

# 默认清华 PyPI；海外可：docker compose build --build-arg PIP_INDEX_URL=https://pypi.org/simple
ARG PIP_INDEX_URL=https://pypi.tuna.tsinghua.edu.cn/simple
ENV PIP_INDEX_URL=${PIP_INDEX_URL} \
    PIP_DISABLE_PIP_VERSION_CHECK=1 \
    PIP_DEFAULT_TIMEOUT=120

COPY requirements.txt ./
# BuildKit 缓存加速重复构建；需 Docker 20.10+（compose 默认开 BuildKit）
RUN --mount=type=cache,target=/root/.cache/pip \
    pip install -r requirements.txt

COPY . .

# 可选：构建时自动拉取远端仓库最新代码覆盖工作目录（默认关闭）。
# 放在 COPY 之后，避免影响依赖层缓存；仅在你显式开启时才会触发网络更新。
# 用法示例：
# docker compose build \
#   --build-arg GIT_AUTO_UPDATE=1 \
#   --build-arg GIT_REMOTE_URL=https://github.com/you/repo.git \
#   --build-arg GIT_REF=main
ARG GIT_AUTO_UPDATE=0
ARG GIT_REMOTE_URL=
ARG GIT_REF=main
RUN if [ "$GIT_AUTO_UPDATE" = "1" ] && [ -n "$GIT_REMOTE_URL" ]; then \
      set -eux; \
      apt-get update; \
      apt-get install -y --no-install-recommends git ca-certificates; \
      rm -rf /var/lib/apt/lists/*; \
      tmpdir="$(mktemp -d)"; \
      git clone --depth=1 --branch "$GIT_REF" "$GIT_REMOTE_URL" "$tmpdir/repo"; \
      cp -a "$tmpdir/repo/." /app/; \
      rm -rf "$tmpdir"; \
    else \
      echo "Skip remote code update (GIT_AUTO_UPDATE=0 or GIT_REMOTE_URL empty)"; \
    fi

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