# Nexus-Core Inference - Fixed Build
# HF Spaces CPU (2 vCPU, 16GB RAM)

FROM python:3.10-slim

WORKDIR /app

# System dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Create ALL necessary folders BEFORE copying files
RUN mkdir -p /app/models /app/engine

# Copy application files
COPY app.py .

# Copy engine folder (if it exists)
COPY engine/__init__.py ./engine/__init__.py
COPY engine/search.py ./engine/search.py

# Download Nexus-Core model from HuggingFace
RUN python -c "from huggingface_hub import hf_hub_download; \
    print('Downloading Nexus-Core model...'); \
    hf_hub_download( \
        repo_id='GambitFlow/Nexus-Core', \
        filename='nexus_core.onnx', \
        local_dir='/app/models', \
        local_dir_use_symlinks=False \
    ); \
    print('Download complete!')"

# Verify model file exists
RUN ls -lh /app/models/ && \
    test -f /app/models/nexus_core.onnx && \
    echo "✅ Model file verified" || \
    (echo "❌ Model file missing!" && exit 1)

EXPOSE 7860

# Environment variables
ENV PYTHONUNBUFFERED=1
ENV OMP_NUM_THREADS=2
ENV MKL_NUM_THREADS=2

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:7860/health || exit 1

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