FROM node:20-alpine AS base

# Install dependencies only when needed
FROM base AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
RUN \
  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
  elif [ -f package-lock.json ]; then npm ci; \
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \
  else echo "Lockfile not found." && exit 1; \
  fi


# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Next.js collects completely anonymous telemetry data about general usage.
# Learn more here: https://nextjs.org/telemetry
# Uncomment the following line in case you want to disable telemetry during the build.
# ENV NEXT_TELEMETRY_DISABLED 1

RUN \
  if [ -f yarn.lock ]; then yarn run build; \
  elif [ -f package-lock.json ]; then npm run build; \
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm run build; \
  else echo "Lockfile not found." && exit 1; \
  fi

# Setup Nginx and serve the built application with PM2
FROM node:20-alpine AS app

WORKDIR /app

# Install PM2 globally
RUN npm install -g pm2

# Set environment variables
ENV NODE_ENV=production
# Uncomment the following line in case you want to disable telemetry during runtime.
# ENV NEXT_TELEMETRY_DISABLED 1

# Create a system user and group
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Install Nginx
RUN apk update && apk add --no-cache nginx

# Copy the Nginx configuration file
COPY nginx-template.conf /etc/nginx/http.d/default.conf

# Copy the PM2 config file
COPY pm2.config.js /app/pm2.config.js

# Copy the built Next.js app from the builder stage
COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Set the correct permission for prerender cache
# RUN mkdir -p .next && chown nextjs:nodejs .next

# Copy the .env.production file
COPY .env.production /app/.env.production

# Switch to the non-root user
# USER nextjs

# Expose the port
EXPOSE 3005

# Start Nginx and the Next.js app with PM2
CMD ["sh", "-c", "nginx && pm2-runtime start pm2.config.js"]