# Multi-stage build for Next.js Dashboard
FROM node:20-alpine AS base

# Install dependencies only when needed
FROM base AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Copy package files
COPY package.json package-lock.json* ./
RUN npm ci && npm install @next/swc-linux-x64-musl --save-optional 2>/dev/null || true

# Build the source code
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# NEXT_PUBLIC_API_URL defaults to http://localhost:8000 in use-trading-data.ts
# The browser fetches from the host machine, not Docker internal network
ENV NEXT_TELEMETRY_DISABLED=1
RUN npm run build

# Production image
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

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

# standalone output includes server.js + required node_modules
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

EXPOSE 3000

ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

CMD ["node", "server.js"]