# ============================================================
#  Math Search Engine — Hugging Face Spaces (Gradio SDK)
#  
#  This runs as a Python app. The React frontend is pre-built
#  and served as static files from FastAPI.
# ============================================================

FROM python:3.11-slim

# Install Node.js for building React frontend
RUN apt-get update && \
    apt-get install -y --no-install-recommends curl && \
    curl -fsSL https://deb.nodesource.com/setup_20.x | bash - && \
    apt-get install -y --no-install-recommends nodejs && \
    apt-get clean && rm -rf /var/lib/apt/lists/*

# Create non-root user (required by HF Spaces)
RUN useradd -m -u 1000 appuser

WORKDIR /app

# ── Python backend dependencies ────────────────────────────
COPY Backend/requirements.txt /app/Backend/requirements.txt
RUN pip install --no-cache-dir -r /app/Backend/requirements.txt

# Download NLTK data
RUN python -c "import nltk; nltk.download('punkt'); nltk.download('punkt_tab'); nltk.download('wordnet'); nltk.download('stopwords'); nltk.download('omw-1.4')"

# ── Build React frontend ───────────────────────────────────
COPY Frontend/package.json Frontend/package-lock.json /app/Frontend/
RUN cd /app/Frontend && npm ci

COPY Frontend/ /app/Frontend/
RUN cd /app/Frontend && npm run build

# Clean up node_modules to save image size (~200 MB)
RUN rm -rf /app/Frontend/node_modules

# ── Copy backend source ────────────────────────────────────
COPY Backend/ /app/Backend/

# ── Copy datasets ──────────────────────────────────────────
COPY Documents/ /app/Documents/

# ── Copy entry point ───────────────────────────────────────
COPY app.py /app/app.py

# Give appuser ownership
RUN chown -R appuser:appuser /app

USER appuser

# HF Spaces expects port 7860
EXPOSE 7860

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