# ── Base ──────────────────────────────────────────────────────────
FROM python:3.10-slim

# Use Python 3.10 deliberately — avoids ALL the Python 3.13 issues:
#   - audioop removed in 3.13 (broke gradio 4.x)
#   - torch cp313 wheels only exist >=2.5.0 (huge download)
#   - tokenizers cp313 ABI issues
# Python 3.10 is stable, well-tested, and all packages have wheels.

RUN apt-get update && apt-get install -y --no-install-recommends \
        git curl build-essential \
    && rm -rf /var/lib/apt/lists/*

# ── Non-root user (required by HF Spaces) ────────────────────────
RUN useradd -m -u 1000 user
USER user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

WORKDIR $HOME/app

COPY --chown=user requirements.txt .
COPY --chown=user app.py .

# ── Install deps ──────────────────────────────────────────────────
RUN pip install --no-cache-dir --upgrade pip

# Install torch (CPU) separately first for better layer caching
RUN pip install --no-cache-dir torch==2.3.1 --index-url https://download.pytorch.org/whl/cpu

# Install everything else — no version conflicts on Python 3.10
RUN pip install --no-cache-dir -r requirements.txt

# ── Pre-download BioGPT weights into image (no cold-start delay) ──
RUN python - <<'PYEOF'
from transformers import BioGptTokenizer, BioGptForCausalLM
print("Pre-downloading microsoft/biogpt ...")
BioGptTokenizer.from_pretrained("microsoft/biogpt")
BioGptForCausalLM.from_pretrained("microsoft/biogpt")
print("Done.")
PYEOF

# ── Runtime ───────────────────────────────────────────────────────
ENV GRADIO_SERVER_NAME=0.0.0.0 \
    GRADIO_SERVER_PORT=7860 \
    PYTHONUNBUFFERED=1 \
    TRANSFORMERS_CACHE=/home/user/.cache/huggingface \
    CREWAI_TELEMETRY_OPT_OUT=1 \
    OTEL_SDK_DISABLED=true \
    OPENAI_API_KEY=sk-no-key-needed

EXPOSE 7860
CMD ["python", "app.py"]