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

candidates=(
  "${PYTHON:-}"
  "/usr/local/bin/python3"
  "/Library/Frameworks/Python.framework/Versions/Current/bin/python3"
  "/Library/Frameworks/Python.framework/Versions/3.13/bin/python3"
  "/Library/Frameworks/Python.framework/Versions/3.12/bin/python3"
  "/usr/bin/python3"
  "/opt/homebrew/bin/python3"
  "python3"
)

seen=""
for py in "${candidates[@]}"; do
  [[ -n "$py" ]] || continue
  if [[ "$py" != /* ]]; then
    resolved="$(command -v "$py" 2>/dev/null || true)"
  else
    resolved="$py"
  fi
  [[ -x "$resolved" ]] || continue
  case ":$seen:" in
    *":$resolved:"*) continue ;;
  esac
  seen="$seen:$resolved"
  if "$resolved" - <<'PY' >/dev/null 2>&1
import tkinter
PY
  then
    printf '%s\n' "$resolved"
    exit 0
  fi
done

echo "No Python with tkinter support found. Install Python from python.org or a Tk-enabled Python runtime." >&2
exit 1