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post_install() {
  _go_automate_configure_user_bridge
}

post_upgrade() {
  _go_automate_configure_user_bridge
}

pre_remove() {
  _go_automate_disable_user_bridge
}

_go_automate_configure_user_bridge() {
  local unit="go-automate-home-assistant-bridge.service"

  if command -v systemctl >/dev/null 2>&1; then
    systemctl --global enable "$unit" >/dev/null 2>&1 || true
  fi

  if [ -n "${SUDO_USER:-}" ] && [ "$SUDO_USER" != "root" ]; then
    _go_automate_enable_for_user "$SUDO_USER" "$unit"
  fi

  cat <<'EOF'
go-automate: installed user service go-automate-home-assistant-bridge.service

- Enabled globally for future logins with systemd user sessions.
- If the installing user has an active user systemd session, the service was started for that user as well.
- Home Assistant config is read from ~/.config/go-automate/config.yml for each user.

If the service is not running yet for your current session, run:
  systemctl --user daemon-reload
  systemctl --user enable --now go-automate-home-assistant-bridge.service
EOF
}

_go_automate_enable_for_user() {
  local user="$1"
  local unit="$2"
  local uid
  local runtime_dir
  local bus_path

  uid="$(id -u "$user" 2>/dev/null)" || return 0
  runtime_dir="/run/user/$uid"
  bus_path="$runtime_dir/bus"

  if [ ! -S "$bus_path" ]; then
    return 0
  fi

  runuser -u "$user" -- env \
    XDG_RUNTIME_DIR="$runtime_dir" \
    DBUS_SESSION_BUS_ADDRESS="unix:path=$bus_path" \
    systemctl --user daemon-reload >/dev/null 2>&1 || return 0

  runuser -u "$user" -- env \
    XDG_RUNTIME_DIR="$runtime_dir" \
    DBUS_SESSION_BUS_ADDRESS="unix:path=$bus_path" \
    systemctl --user enable --now "$unit" >/dev/null 2>&1 || return 0
}

_go_automate_disable_user_bridge() {
  local unit="go-automate-home-assistant-bridge.service"

  if command -v systemctl >/dev/null 2>&1; then
    systemctl --global disable "$unit" >/dev/null 2>&1 || true
  fi

  if [ -n "${SUDO_USER:-}" ] && [ "$SUDO_USER" != "root" ]; then
    _go_automate_disable_for_user "$SUDO_USER" "$unit"
  fi
}

_go_automate_disable_for_user() {
  local user="$1"
  local unit="$2"
  local uid
  local runtime_dir
  local bus_path

  uid="$(id -u "$user" 2>/dev/null)" || return 0
  runtime_dir="/run/user/$uid"
  bus_path="$runtime_dir/bus"

  if [ ! -S "$bus_path" ]; then
    return 0
  fi

  runuser -u "$user" -- env \
    XDG_RUNTIME_DIR="$runtime_dir" \
    DBUS_SESSION_BUS_ADDRESS="unix:path=$bus_path" \
    systemctl --user disable --now "$unit" >/dev/null 2>&1 || return 0
}