# =============================================================================
# Stage 1: Build React Frontend
# =============================================================================
FROM node:20-alpine AS frontend-builder

WORKDIR /app/frontend
COPY frontend/package*.json ./
RUN npm install
COPY frontend/ ./
RUN npm run build

# =============================================================================
# Stage 2: Python Backend (CPU-only) with RAG
# =============================================================================
FROM python:3.10-slim

ENV PYTHONUNBUFFERED=1 DEBIAN_FRONTEND=noninteractive

WORKDIR /app

# Install system deps and Python packages in one layer
RUN apt-get update && apt-get install -y git curl && rm -rf /var/lib/apt/lists/* && \
    pip install --no-cache-dir --upgrade pip setuptools wheel && \
    pip install --no-cache-dir torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu && \
    pip install --no-cache-dir transformers accelerate scipy bitsandbytes peft fastapi uvicorn pydantic python-multipart && \
    pip install --no-cache-dir langchain==0.1.0 langchain-community==0.0.20 chromadb==0.4.22 sentence-transformers==2.3.1 pypdf==4.1.0 pymupdf==1.23.26 requests==2.31.0

# Copy code (including ingest script)
COPY backend/ /app/backend/
COPY --from=frontend-builder /app/frontend/dist /app/dist

# Create directories for docs and vectorstore
RUN mkdir -p /app/backend/docs /app/backend/vectorstore

WORKDIR /app/backend
EXPOSE 7860

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]