FROM python:3.12-slim

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    TIKTOKEN_CACHE_DIR=/opt/tiktoken_cache

WORKDIR /app

COPY backend/requirements.txt /tmp/requirements.txt
RUN pip install --upgrade pip -i https://pypi.tuna.tsinghua.edu.cn/simple \
    && pip install -r /tmp/requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple \
    && rm -f /tmp/requirements.txt

RUN python -c "import fastapi, uvicorn, psycopg, psycopg_pool, sqlalchemy, redis, jwt, passlib, httpx, minio, alembic; print('backend dependency check ok')"

RUN mkdir -p /opt/yg-ft/logs/backend /data/yg-ft /opt/tiktoken_cache \
    && chmod -R 0775 /opt/yg-ft /data/yg-ft /opt/tiktoken_cache

# 离线打包 tiktoken cl100k_base 词表（与运行时 TIKTOKEN_CACHE_DIR 对齐），
# 文件名采用官方 SHA，避免代码走 fallback 重建 Encoding 的分支。
COPY docker/app/tiktoken/9b5ad71b2ce5302211f9c61530b329a4922fc6a4 /opt/tiktoken_cache/

EXPOSE 8000

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