# Multi-stage build for combined frontend + backend
FROM node:20-alpine AS backend-builder

WORKDIR /app/backend

# Install ortools from Alpine packages (if available)
RUN apk add --no-cache \
    python3 \
    py3-pip \
    build-base \
    python3-dev

# Try Alpine package first, then pip as fallback
RUN apk add py3-ortools 2>/dev/null || pip3 install --break-system-packages --no-cache-dir ortools

# Create symlink so python3 is callable as python
RUN ln -sf /usr/bin/python3 /usr/bin/python

# Copy backend files
COPY backend/package*.json ./
COPY backend/tsconfig.json ./

# Install backend dependencies
RUN npm ci

# Copy backend source
COPY backend/src/ ./src/

# Build backend
RUN npm run build

RUN echo "import ortools; import ortools.sat.python.cp_model; print('OR-Tools installed successfully')" > verify_ortools.py \
 && python3 verify_ortools.py \
 && rm verify_ortools.py

# Verify Python and OR-Tools installation
RUN echo "import ortools; import ortools.sat.python.cp_model; print('OR-Tools installed successfully')" > verify_ortools.py \
 && python verify_ortools.py \
 && rm verify_ortools.py

# Frontend build stage
FROM node:20-alpine AS frontend-builder

WORKDIR /app/frontend

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

# Install frontend dependencies
RUN npm ci

# Copy frontend source
COPY frontend/src/ ./src/
COPY frontend/public/ ./public/

# Build frontend
RUN npm run build

# Production stage
FROM node:20-alpine

WORKDIR /app

# Install Python and OR-Tools for production
#RUN apk add --no-cache \
#    python \
#    py3-pip \
#    && pip3 install ortools

# Install PM2 for process management
RUN npm install -g pm2

# Copy backend built files
COPY --from=backend-builder /app/backend/package*.json ./
COPY --from=backend-builder /app/backend/dist/ ./dist/
COPY --from=backend-builder /app/backend/node_modules/ ./node_modules/
# COPY --from=backend-builder /app/backend/python-scripts/ ./python-scripts/

# Copy frontend built files  
COPY --from=frontend-builder /app/frontend/build/ ./frontend-build/

# Copy PM2 configuration
COPY ecosystem.config.js ./

# Create a non-root user
RUN addgroup -g 1001 -S nodejs && \
    adduser -S schichtplan -u 1001 && \
    chown -R schichtplan:nodejs /app

USER schichtplan

# Verify installations
#RUN python --version && \
#    python -c "from ortools.sat.python import cp_model; print('OR-Tools verified')"

EXPOSE 3000 3002

HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3002/api/health || exit 1

CMD ["pm2-runtime", "ecosystem.config.js"]