# Stage 1: Build the React static frontend
FROM node:20-alpine AS frontend-builder
WORKDIR /app/frontend

# Copy dependencies list and install
COPY frontend/package*.json ./
RUN npm install

# Copy source code and build
COPY frontend/ ./
RUN npm run build

# Stage 2: Create the production Python environment
FROM python:3.12-slim
WORKDIR /app

# Install system utilities if needed (lightweight slim image)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy backend requirements and install
COPY backend/requirements.txt ./backend/requirements.txt
RUN pip install --no-cache-dir -r backend/requirements.txt

# Copy model artifacts
COPY model_artifacts/ ./model_artifacts/

# Copy backend code
COPY backend/ ./backend/

# Copy built frontend assets from Stage 1 into FastAPI's static folder
COPY --from=frontend-builder /app/frontend/dist ./backend/static

# Expose the default Hugging Face Space port
EXPOSE 7860

# Run FastAPI app
CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "7860"]