type ShortcutHandler = {
  key: string;
  ctrl?: boolean;
  shift?: boolean;
  handler: () => void;
  when?: () => boolean;
};

let registered = false;
let shortcuts: ShortcutHandler[] = [];
let cleanup: (() => void) | null = null;

export function setShortcuts(handlers: ShortcutHandler[]) {
  shortcuts = handlers;
}

export function registerShortcuts() {
  if (registered) return;
  registered = true;

  const onKeyDown = (e: KeyboardEvent) => {
    // skip when typing in inputs
    const tag = (e.target as HTMLElement)?.tagName;
    if (tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT') return;

    for (const s of shortcuts) {
      const ctrlMatch = s.ctrl ? (e.ctrlKey || e.metaKey) : !(e.ctrlKey || e.metaKey);
      const shiftMatch = s.shift ? e.shiftKey : !e.shiftKey;
      const keyMatch = e.key === s.key || e.code === s.key;

      if (keyMatch && ctrlMatch && shiftMatch) {
        if (s.when && !s.when()) continue;
        e.preventDefault();
        s.handler();
        return;
      }
    }
  };

  window.addEventListener('keydown', onKeyDown);
  cleanup = () => {
    window.removeEventListener('keydown', onKeyDown);
    registered = false;
  };
}

export function unregisterShortcuts() {
  cleanup?.();
  cleanup = null;
  shortcuts = [];
}