#!/bin/sh
# Switch the database container to an image tag that already exists on zeus.
#
# It does NOT build. The database is built on zeus - the images there are tagged
# smartbotic-database:<version>, alongside the smartbotic-db-build:<version> the
# build itself uses. An earlier version of this script built from mulan's binary
# instead, and would have DOWNGRADED a running 2.10.0 to mulan's packaged 2.9.0,
# because mulan's package lags what is built on zeus. Hence the check below.
#
#   ./deploy.sh 2.10.0     switch to that image
#   ./deploy.sh            show what is running and what is available
set -eu

ZEUS=${ZEUS:-zeus}
WANT=${1:-}

running=$(ssh "$ZEUS" 'docker exec smartbotic-db /usr/bin/smartbotic-database --version 2>/dev/null | head -1' || echo "not running")
echo "running: $running"

if [ -z "$WANT" ]; then
    echo "available images:"
    ssh "$ZEUS" 'docker image ls --format "  {{.Repository}}:{{.Tag}}" | grep -E "smartbotic-database:" | sort'
    echo
    echo "give a tag to switch to it, e.g. ./deploy.sh 2.10.0"
    exit 0
fi

ssh "$ZEUS" "docker image inspect smartbotic-database:$WANT >/dev/null 2>&1" || {
    echo "no image smartbotic-database:$WANT on $ZEUS - build it there first" >&2
    exit 1
}

# Going backwards is possible and sometimes right, but never by accident.
case "$running" in
  *"$WANT"*) echo "already running $WANT" ;;
  *) printf 'switch to %s? [y/N] ' "$WANT"; read -r answer
     case "$answer" in y|Y) ;; *) echo "left alone"; exit 0 ;; esac ;;
esac

ssh "$ZEUS" "docker tag smartbotic-database:$WANT smartbotic-database:current && \
  cd /data/smartbotic-db && \
  docker rm -f smartbotic-db >/dev/null 2>&1 || true; \
  docker compose up -d >/dev/null && sleep 8 && \
  docker logs --tail 3 smartbotic-db 2>&1 | grep -iE 'recovery complete|error' || true"

echo "now: $(ssh "$ZEUS" 'docker exec smartbotic-db /usr/bin/smartbotic-database --version 2>&1 | head -1')"
echo
echo "The previous image is still on zeus under its own version tag, so a"
echo "rollback is ./deploy.sh <that version>."
echo
echo "mulan's webserver reconnects on its own within a few seconds. Until it"
echo "does it will report zero workflows - that is the connection, not the data."