import { useEffect } from "react";
import { useTranslation } from "react-i18next";
import { Redo2, Undo2 } from "lucide-react";

// Reusable undo/redo buttons with Ctrl/Cmd+Z (undo) and Ctrl/Cmd+Y or Ctrl/Cmd+Shift+Z
// (redo) shortcuts. Pairs with useUndoable but takes plain props, so it works with any
// undo source. The shortcuts ignore keystrokes while a text field is focused.
export default function UndoToolbar({
  canUndo,
  canRedo,
  onUndo,
  onRedo,
}: {
  canUndo: boolean;
  canRedo: boolean;
  onUndo: () => void;
  onRedo: () => void;
}) {
  const { t } = useTranslation();

  useEffect(() => {
    function onKey(e: KeyboardEvent) {
      if (!(e.ctrlKey || e.metaKey)) return;
      const tgt = e.target as HTMLElement | null;
      if (
        tgt &&
        (tgt.tagName === "INPUT" ||
          tgt.tagName === "TEXTAREA" ||
          tgt.isContentEditable)
      )
        return;
      const k = e.key.toLowerCase();
      if (k === "z" && !e.shiftKey) {
        if (canUndo) {
          e.preventDefault();
          onUndo();
        }
      } else if (k === "y" || (k === "z" && e.shiftKey)) {
        if (canRedo) {
          e.preventDefault();
          onRedo();
        }
      }
    }
    window.addEventListener("keydown", onKey);
    return () => window.removeEventListener("keydown", onKey);
  }, [canUndo, canRedo, onUndo, onRedo]);

  const btn =
    "p-1.5 rounded-lg border border-border text-muted enabled:hover:text-fg enabled:hover:border-accent disabled:opacity-30 transition";
  return (
    <div className="inline-flex items-center gap-1">
      <button onClick={onUndo} disabled={!canUndo} title={t("common.undo")} aria-label={t("common.undo")} className={btn}>
        <Undo2 className="w-4 h-4" />
      </button>
      <button onClick={onRedo} disabled={!canRedo} title={t("common.redo")} aria-label={t("common.redo")} className={btn}>
        <Redo2 className="w-4 h-4" />
      </button>
    </div>
  );
}
