#!/usr/bin/env bash
# The move: handover --move runs this on the VM once Railway's app services
# are stopped and the last copy of the data is here.
# From https://exe.dev/deploy/migrate-railway
#
#   railway/move        restore the data, start everything, turn cron jobs on
#   railway/move undo   turn cron jobs off and say how to restart Railway
set -euo pipefail
cd ~/app
log() { printf '\033[1m%s\033[0m\n' "$*"; }
mapfile -t stopped < <(~/railway/import plan | awk -F'\t' '$1 == "stop" {print $2}')

if [ "${1:-}" = undo ]; then
  crontab ~/app/crontab.base
  log "Cron jobs are off on the VM. To bring Railway back, on your computer:"
  for s in "${stopped[@]}"; do echo "  railway redeploy --service '$s' --from-source --yes"; done
  exit
fi

railway=$(cat ~/railway/railway-url)
code=$(curl -s -o /dev/null -w '%{http_code}' --max-time 20 "$railway/" || true)
case $code in 2*|3*) log "Railway still answers at $railway ($code). Stop it first: handover --move does."; exit 1 ;; esac

log "Stopping the app on the VM, restoring the last copy of the data"
mapfile -t apps < <(~/railway/import list | awk -F'\t' '$3 == "code" || $3 == "image" {print $2}')
docker compose stop "${apps[@]}"
~/railway/restore
log "Starting everything"
docker compose up -d
cat ~/app/crontab.base ~/app/crontab.jobs | crontab -
sleep 10
docker compose ps --format 'table {{.Service}}\t{{.Status}}'
log "Comparing pages with Railway's answers from the rehearsal"
~/railway/check --saved || log "Some pages differ: look before you change DNS."
date -u +%FT%TZ > ~/railway/moved
cat <<NEXT

Next, at your DNS provider, point your domains at $(hostname).exe.xyz, then on your computer:
  ssh exe.dev domain add $(hostname) <your domain>
  ssh exe.dev share set-public $(hostname)
Changed your mind? ssh $(hostname).exe.xyz railway/move undo
NEXT