# Multi-stage build for Generic App Service single container

# Stage 1: Build frontend
FROM node:20-alpine as frontend-builder

WORKDIR /frontend

# Copy package files
COPY frontend/package*.json ./

# Install dependencies
RUN if [ -f package-lock.json ]; then npm ci --no-audit --no-fund; else npm install --no-audit --no-fund; fi

# Copy frontend source
COPY frontend/ .

# Build frontend
RUN npm run build

# Stage 2: Build backend dependencies
FROM python:3.11-slim as backend-builder

WORKDIR /app

# Install only essential build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

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

# Stage 3: Final image
FROM python:3.11-slim

WORKDIR /app

# Copy Python packages from builder
COPY --from=backend-builder /root/.local /root/.local

# Make sure scripts in .local are usable
ENV PATH=/root/.local/bin:$PATH

# Create config directory
RUN mkdir -p /config

# Copy backend application
COPY backend/app ./app
COPY backend/alembic ./alembic
COPY backend/alembic.ini .
COPY .env .

# Copy built frontend from frontend-builder
COPY --from=frontend-builder /frontend/dist ./static

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health')" || exit 1

# Run database migrations and start the application
CMD ["sh", "-c", "alembic upgrade head && uvicorn app.main:app --host 0.0.0.0 --port 8000"]