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

open_settings=false

while [[ $# -gt 0 ]]; do
  case "$1" in
    --open-settings)
      open_settings=true
      shift
      ;;
    *)
      printf "Unknown option: %s\n" "$1" >&2
      exit 1
      ;;
  esac
done

screen_sharing_enabled() {
  launchctl print system/com.apple.screensharing >/dev/null 2>&1
}

vnc_listening() {
  nc -z 127.0.0.1 5900 >/dev/null 2>&1
}

remote_management_enabled() {
  launchctl print system/com.apple.RemoteDesktop.agent >/dev/null 2>&1
}

write_step() {
  local label="$1" status="$2"
  printf "[%s] %s\n" "$status" "$label"
}

printf "AllReach macOS Screen Sharing host preparation\n"
printf "Mode: check only\n\n"

if screen_sharing_enabled; then
  write_step "Screen Sharing service" "OK"
elif remote_management_enabled; then
  write_step "Remote Management service" "OK"
else
  write_step "Screen Sharing or Remote Management" "CHANGE"
fi

if vnc_listening; then
  write_step "TCP 5900 listener" "OK"
else
  write_step "TCP 5900 listener" "CHECK"
  printf "  Listener appears after Screen Sharing or Remote Management is enabled.\n"
fi

printf "\nNo settings were changed.\n"
printf "To enable hosting manually: System Settings > General > Sharing > Screen Sharing.\n"

if [[ "$open_settings" == true ]]; then
  open "x-apple.systempreferences:com.apple.preferences.sharing"
fi