#!/usr/bin/env bash
set -euo pipefail

log() {
  printf '[stop] %s\n' "$*"
}

usage() {
  cat <<'EOF'
Usage: ./stop.sh <id-or-name-prefix>

Sends Ctrl+Alt+Del to the guest via the Firecracker API socket.
EOF
}

get_prop() {
  local info="$1"
  local key="$2"
  awk -F= -v k="$key" '$1==k {print $2}' "$info"
}

find_vm_info() {
  local query="$1"
  local info match_count=0 match=""

  for info in state/vms/*/info; do
    [[ -f "$info" ]] || continue
    local id name
    id="$(get_prop "$info" "id")"
    name="$(get_prop "$info" "name")"
    if [[ "$id" == "$query"* || "$name" == "$query"* ]]; then
      match="$info"
      match_count=$((match_count + 1))
    fi
  done

  if (( match_count == 0 )); then
    log "no VM found for prefix: $query"
    exit 1
  fi
  if (( match_count > 1 )); then
    log "multiple VMs found for prefix: $query"
    exit 1
  fi

  printf '%s' "$match"
}

QUERY="${1:-}"
if [[ -z "$QUERY" || "$QUERY" == "-h" || "$QUERY" == "--help" ]]; then
  usage
  exit 1
fi

INFO_FILE="$(find_vm_info "$QUERY")"
API_SOCK="$(get_prop "$INFO_FILE" "api_sock")"
if [[ -z "$API_SOCK" || ! -S "$API_SOCK" ]]; then
  log "api socket not found: $API_SOCK"
  exit 1
fi

log "sending Ctrl+Alt+Del to guest"
sudo -E curl --unix-socket "$API_SOCK" -X PUT http://localhost/actions \
  -H "Content-Type: application/json" \
  -d '{ "action_type": "SendCtrlAltDel" }' >/dev/null
log "requested shutdown"