# Next.js frontend for /var/www/boundary-fastapiandnextjs
# IMPORTANT: Must use STANDALONE (node server.js), NOT "npm start" / "next start".
# "next start" does not work with output: standalone and uses more memory → OOM kills.
#
# Requires Node.js >= 20.9.0 (Next.js 16). If you see "Node.js version >=20.9.0 is required":
#   sudo bash /var/www/boundary-fastapiandnextjs/scripts/install_node20_ubuntu.sh
#   sudo systemctl restart nextjs
#
# Install service:
#   sudo cp /var/www/boundary-fastapiandnextjs/scripts/nextjs.service /etc/systemd/system/nextjs.service
#   sudo systemctl daemon-reload
#   sudo systemctl enable nextjs
#   sudo systemctl start nextjs
#
# If you use nvm: systemd does not load nvm, so /usr/bin/node may not exist → 203/EXEC.
#   Run "which node" and set ExecStart to that path, e.g.:
#   ExecStart=/root/.nvm/versions/node/v20.20.0/bin/node server.js
#   (Or set PATH to include that bin dir: Environment=PATH=/root/.nvm/versions/node/v20.20.0/bin:/usr/bin:/bin)
#
# Memory: Node heap 1536M for 4GB RAM; set 512 for 2GB. Standalone = lower memory.
# Deploy: use scripts/build_nextjs_artifact.sh locally, upload tarball, run scripts/unpack_and_start_nextjs.sh on server.
#         Or: cd plagis-nextjs && npm run build && cp -r public .next/standalone/public, then copy this unit.
# See docs/PRODUCTION_NEXTJS_OOM.md

[Unit]
Description=Next.js Application (Boundary Commission)
After=network.target

[Service]
Type=simple
User=root
# Standalone server – must exist (run unpack_and_start_nextjs.sh with nextjs-standalone.tar.gz)
WorkingDirectory=/var/www/boundary-fastapiandnextjs/plagis-nextjs/.next/standalone
Environment=NODE_ENV=production
Environment=PORT=3000
# 1536M for 4GB RAM; use 512 for 2GB droplets
Environment=NODE_OPTIONS=--max-old-space-size=1536
# PATH for NodeSource; for nvm replace ExecStart with full path from "which node"
Environment=PATH=/usr/local/bin:/usr/bin:/bin

# NodeSource: /usr/bin/node. For nvm use: ExecStart=/root/.nvm/versions/node/v20.20.0/bin/node server.js
ExecStart=/usr/bin/node server.js
ExecStartPre=-/bin/sh -c 'test -f /var/www/boundary-fastapiandnextjs/plagis-nextjs/.next/standalone/server.js || (echo "Missing standalone: run unpack_and_start_nextjs.sh with nextjs-standalone.tar.gz"; exit 1)'
Restart=always
RestartSec=5

# Optional: cap memory so OOM kills this service instead of SSH (4GB box: 1536M; 2GB: 768M)
# MemoryMax=1536M

[Install]
WantedBy=multi-user.target