FROM python:3.10-slim

WORKDIR /app

COPY requirements.txt .

RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Pre-download models during build so runtime stays offline
ENV TRANSFORMERS_CACHE=/app/.cache/huggingface/transformers
ENV HF_HOME=/app/.cache/huggingface

RUN python -c "\
from transformers import AutoTokenizer, AutoModelForSeq2SeqLM, AutoModelForCausalLM; \
AutoTokenizer.from_pretrained('ArchCoder/fine-tuned-bart-large'); \
AutoModelForSeq2SeqLM.from_pretrained('ArchCoder/fine-tuned-bart-large'); \
AutoTokenizer.from_pretrained('Qwen/Qwen2.5-Coder-0.5B-Instruct'); \
AutoModelForCausalLM.from_pretrained('Qwen/Qwen2.5-Coder-0.5B-Instruct'); \
print('Models downloaded successfully')"

COPY . .

RUN mkdir -p /app/data/uploads /app/static/images

# Lock to offline at runtime — all models are already cached
ENV HF_HUB_OFFLINE=1
ENV TRANSFORMERS_OFFLINE=1
ENV HF_HUB_DISABLE_TELEMETRY=1

EXPOSE 7860

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