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

# ==============================================================================
# Bose-SoundTouch soundtouch-service uninstaller (systemd, headless)
#
# Reverses scripts/raspberry-pi/install.sh: stops and disables the systemd
# service, removes the unit, binary, and config directory.
#
# Usage:
#   sudo bash uninstall.sh            # remove service, KEEP the data directory
#   sudo PURGE_DATA=true bash uninstall.sh   # also delete the data directory
#   sudo bash uninstall.sh --purge           # same as PURGE_DATA=true
#
# Notes:
# - The data directory (${DATA_DIR}) holds your datastore: presets, device
#   registrations, and certificates. It is PRESERVED by default; deleting it is
#   opt-in via PURGE_DATA=true (or --purge).
# - The shared soundtouch:soundtouch user/group is removed only when no other
#   soundtouch-{service,player,web} install remains on this host.
# - Safe to re-run; every step tolerates already-missing pieces.
# ==============================================================================

PURGE_DATA="${PURGE_DATA:-false}"
for arg in "$@"; do
  case "$arg" in
    --purge) PURGE_DATA="true" ;;
  esac
done

SERVICE_NAME="${SERVICE_NAME:-soundtouch-service}"
BIN_PATH="${BIN_PATH:-/usr/local/bin/soundtouch-service}"
CONFIG_DIR="${CONFIG_DIR:-/etc/soundtouch-service}"
DATA_DIR="${DATA_DIR:-/var/lib/soundtouch-service}"
SERVICE_USER="${SERVICE_USER:-soundtouch}"
SERVICE_GROUP="${SERVICE_GROUP:-soundtouch}"

log() { printf "\n==> %s\n" "$*"; }
die() { echo "ERROR: $*" >&2; exit 1; }

need_root() {
  [[ "${EUID}" -eq 0 ]] || die "Please run as root (e.g. sudo bash $0)."
}

ensure_cmd() {
  command -v "$1" >/dev/null 2>&1 || die "Missing required command: $1"
}

stop_remove_service() {
  log "Stopping and disabling ${SERVICE_NAME}.service"
  systemctl disable --now "${SERVICE_NAME}.service" 2>/dev/null || true

  local unit="/etc/systemd/system/${SERVICE_NAME}.service"
  if [[ -f "${unit}" ]]; then
    log "Removing systemd unit: ${unit}"
    rm -f "${unit}"
  fi
  systemctl daemon-reload
  systemctl reset-failed "${SERVICE_NAME}.service" 2>/dev/null || true
}

remove_binary() {
  if [[ -e "${BIN_PATH}" || -e "${BIN_PATH}.old" ]]; then
    log "Removing binary: ${BIN_PATH} (and ${BIN_PATH}.old)"
    rm -f "${BIN_PATH}" "${BIN_PATH}.old"
  fi
}

remove_config() {
  if [[ -d "${CONFIG_DIR}" ]]; then
    log "Removing config directory: ${CONFIG_DIR}"
    rm -rf "${CONFIG_DIR}"
  fi
}

handle_data_dir() {
  if [[ ! -d "${DATA_DIR}" ]]; then
    return
  fi
  if [[ "${PURGE_DATA}" == "true" ]]; then
    log "Removing data directory: ${DATA_DIR}"
    rm -rf "${DATA_DIR}"
  else
    log "Preserving data directory: ${DATA_DIR}"
    echo "    This holds your datastore (presets, device registrations, certs)."
    echo "    To delete it as well, run:  sudo rm -rf ${DATA_DIR}"
    echo "    (or re-run this uninstaller with --purge / PURGE_DATA=true)"
  fi
}

# Remove the shared soundtouch:soundtouch user/group only when no other
# soundtouch-{service,player,web} install remains on this host.
remove_user_group_if_unused() {
  local n
  for n in service player web; do
    if [[ -f "/etc/systemd/system/soundtouch-${n}.service" ]] || \
       [[ -e "/usr/local/bin/soundtouch-${n}" ]]; then
      log "Keeping ${SERVICE_USER}:${SERVICE_GROUP} — still used by soundtouch-${n}."
      return
    fi
  done

  if id -u "${SERVICE_USER}" >/dev/null 2>&1; then
    log "No other soundtouch installs remain; removing user ${SERVICE_USER}"
    userdel "${SERVICE_USER}" 2>/dev/null || true
  fi
  if getent group "${SERVICE_GROUP}" >/dev/null 2>&1; then
    groupdel "${SERVICE_GROUP}" 2>/dev/null || true
  fi
}

main() {
  need_root
  ensure_cmd systemctl

  stop_remove_service
  remove_binary
  remove_config
  handle_data_dir
  remove_user_group_if_unused

  log "✅ soundtouch-service has been removed."
}

main "$@"