#!/usr/bin/env bash
#
# clawmates rolling deploy — polls the fleet registry for :latest of the three
# prod images (broker, server, frontend). On drift, pulls the new image, retags
# it under the un-prefixed name the running compose file uses, and rolls the
# affected services with `docker compose up -d`.
#
# Install:
#   sudo install -m 0755 clawmates-deploy.sh /usr/local/bin/clawmates-deploy.sh
#   sudo install -m 0644 clawmates-deploy.service /etc/systemd/system/
#   sudo install -m 0644 clawmates-deploy.timer   /etc/systemd/system/
#   sudo systemctl daemon-reload
#   sudo systemctl enable --now clawmates-deploy.timer
#
# Verify:
#   systemctl list-timers clawmates-deploy.timer
#   tail -f /var/log/clawmates-deploy.log
#
# The retag step (registry/clawmates/<svc>:latest → clawmates/<svc>:latest)
# keeps the current /root/clawmates/docker-compose.yml working unchanged until
# we're ready to migrate the compose file to registry-prefixed image names.

set -euo pipefail

REGISTRY="${REGISTRY:-100.94.185.103:5000}"
NAMESPACE="${NAMESPACE:-clawmates}"
COMPOSE_DIR="${COMPOSE_DIR:-/root/clawmates}"
LOG="${LOG:-/var/log/clawmates-deploy.log}"
SERVICES=(broker server frontend)

log() { printf '%s %s\n' "$(date -Iseconds)" "$*" | tee -a "$LOG" >/dev/null; }

changed=()
for svc in "${SERVICES[@]}"; do
  ref="${REGISTRY}/${NAMESPACE}/${svc}:latest"
  local_ref="${NAMESPACE}/${svc}:latest"

  before=$(docker inspect --format '{{.Id}}' "$ref" 2>/dev/null || echo "")
  if ! docker pull -q "$ref" >/dev/null 2>&1; then
    log "pull failed: $ref"
    continue
  fi
  after=$(docker inspect --format '{{.Id}}' "$ref")

  if [[ "$before" != "$after" ]]; then
    log "new image for $svc: ${before:-<none>} -> $after"
    changed+=("$svc")
  fi

  # Always keep the un-prefixed tag pointing at the fresh image, so a stale
  # local retag can't wedge us.
  docker tag "$ref" "$local_ref"
done

if [[ ${#changed[@]} -eq 0 ]]; then
  exit 0
fi

log "rolling: ${changed[*]}"
cd "$COMPOSE_DIR"
docker compose up -d "${changed[@]}"
log "roll complete: ${changed[*]}"