# --- STAGE 1: Build Frontend ---
FROM node:20-slim AS frontend-builder
WORKDIR /build
COPY frontend/package*.json ./
RUN npm install
COPY frontend/ ./
RUN npm run build

# --- STAGE 2: Backend Builder ---
FROM python:3.11-slim AS backend-builder
WORKDIR /app
RUN apt-get update && apt-get install -y --no-install-recommends build-essential && rm -rf /var/lib/apt/lists/*
COPY backend/requirements.txt .
RUN pip install --user --no-cache-dir -r requirements.txt

# --- STAGE 3: Final Runtime ---
FROM python:3.11-slim
WORKDIR /app

# System Dependencies (FFmpeg ist essenziell)
RUN apt-get update && apt-get install -y --no-install-recommends \
    ffmpeg \
    && apt-get clean && rm -rf /var/lib/apt/lists/*

# Copy Installed Packages
COPY --from=backend-builder /root/.local /root/.local
ENV PATH=/root/.local/bin:$PATH

# Copy Built Frontend from Stage 1
COPY --from=frontend-builder /build/dist /frontend_static

# Copy Backend Source
COPY backend ./backend

# Environment Variables
ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1

# Expose Port
EXPOSE 8001

# Start FastAPI
CMD ["uvicorn", "backend.app:app", "--host", "0.0.0.0", "--port", "8001"]