# Define build argument for port with default value
ARG PORT=3000

# Stage 1: Build
FROM node:20-alpine AS builder

# Set working directory
WORKDIR /app

# Copy source files
COPY . .

# Install dependencies
RUN --mount=type=cache,target=/root/.npm \
  npm ci

# Build the application
RUN npm run build

# Stage 2: Production
FROM node:20-alpine AS runner

# Forward the build argument
ARG PORT
ENV PORT=$PORT

# Set working directory
WORKDIR /app

# Copy package.json, node_modules and .react-server from builder stage
COPY --from=builder /app/package.json ./
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/.react-server ./.react-server

# Prune dev dependencies
RUN --mount=type=cache,target=/root/.npm \
  npm prune --production

# Run as non-root user
RUN addgroup -g 1001 -S nodejs && \
  adduser -S nodejs -u 1001 && \
  chown -R nodejs:nodejs /app
USER nodejs

# Expose the port your app runs on
EXPOSE ${PORT}

# Start the application
CMD ["npm", "start", "--", "--host"]