# Multi-stage Dockerfile for Next.js app (production)
FROM node:20-alpine AS deps
WORKDIR /app

# Install dependencies
COPY package*.json ./
RUN if [ -f package-lock.json ]; then npm ci; else npm install; fi

# Build stage
FROM node:20-alpine AS builder
WORKDIR /app
ENV NEXT_TELEMETRY_DISABLED=1

ARG NEXT_PUBLIC_API_URL
ARG NODE_ENV
ENV NODE_ENV=$NODE_ENV
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# Runtime stage
FROM node:20-alpine AS runner
WORKDIR /app

# Accept build args and set as env vars
ARG NEXT_PUBLIC_API_URL
ARG PORT=3000

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV PORT=$PORT
ENV HOSTNAME=0.0.0.0
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL

# Install prod deps only for runtime
COPY package*.json ./
RUN if [ -f package-lock.json ]; then npm ci --omit=dev; else npm install --omit=dev; fi

# Copy build artifacts
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/public ./public
COPY --from=builder /app/next.config.* ./

EXPOSE $PORT

CMD ["sh", "-c", "node_modules/.bin/next start -H ${HOSTNAME} -p ${PORT}"]