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

WORKDIR /app

# Install dependencies first (layer-cache friendly)
COPY package.json package-lock.json ./
RUN npm ci --frozen-lockfile

# Copy source and build
COPY . .
RUN npm run build

# ─── Stage 2: Serve ──────────────────────────────────────────────────────────
FROM nginx:1.27-alpine AS runner

# Remove default nginx content
RUN rm -rf /usr/share/nginx/html/*

# Copy built assets from builder stage
COPY --from=builder /app/dist /usr/share/nginx/html

# Copy custom nginx config (handles SPA routing)
COPY nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

CMD ["nginx", "-g", "daemon off;"]