#!/usr/bin/env bash
# Updates this install to a tagged release: back up the database, check out the tag,
# install, migrate, build, and reload PM2. If anything fails before the reload, the
# previous version keeps running and the checkout goes back to it.
#
# Usage (on the server, from the repo folder):  bash scripts/deploy.sh v1.34.0
# CI runs this over SSH when a v* tag is pushed (see .gitea/workflows/ci.yml).
set -euo pipefail

TAG="${1:?Usage: scripts/deploy.sh <tag>}"
cd "$(dirname "$0")/.."
PREVIOUS="$(git describe --tags --exact-match 2>/dev/null || git rev-parse --short HEAD)"

echo "==> Deploying $TAG (currently $PREVIOUS)"

echo "==> Backing up the database"
(cd backend && node -e "require('dotenv').config(); require('./src/utils/backupUtils').runBackup().then(r => console.log('   ', r.filename)).catch(e => { console.error('    Backup failed:', e.message); process.exit(1); })")

rollback() {
  echo "!!> Deploy failed — going back to $PREVIOUS (the running version was not touched)"
  git checkout -q "$PREVIOUS"
  (cd backend && npm ci --silent) || true
  (cd frontend && npm ci --silent && npm run build --silent) || true
}
trap rollback ERR

git fetch --tags --quiet origin
git checkout -q "$TAG"

echo "==> Backend: install and migrate"
(cd backend && npm ci && npm run prisma:deploy)

echo "==> Frontend: install and build"
(cd frontend && npm ci && npm run build)

trap - ERR
echo "==> Reloading PM2"
pm2 reload ecosystem.config.js --update-env

echo "==> Deployed $TAG"