import { useEffect, useRef, useCallback } from 'react';

export interface ShortcutBinding {
  keys: string; // e.g. "Control+k", " ", "m", "alt+1"
  description: string;
  action: () => void;
}

export const useKeyboardShortcuts = (bindings: ShortcutBinding[], enabled: boolean = true) => {
  const bindingsRef = useRef<ShortcutBinding[]>(bindings);

  useEffect(() => {
    bindingsRef.current = bindings;
  }, [bindings]);

  const handleKeyDown = useCallback((e: KeyboardEvent) => {
    if (!enabled) return;

    // Avoid hijacking keystrokes when editing inputs
    const active = document.activeElement;
    if (active) {
      const name = active.tagName.toLowerCase();
      if (name === 'input' || name === 'textarea' || active.getAttribute('contenteditable') === 'true') {
        return;
      }
    }

    const pressedKey = e.key.toLowerCase();
    const isCtrl = e.ctrlKey || e.metaKey;
    const isAlt = e.altKey;
    const isShift = e.shiftKey;

    for (const binding of bindingsRef.current) {
      const keys = binding.keys.toLowerCase().split('+');
      
      const requiresCtrl = keys.includes('control') || keys.includes('ctrl');
      const requiresAlt = keys.includes('alt');
      const requiresShift = keys.includes('shift');
      
      const baseKey = keys.filter(k => !['control', 'ctrl', 'alt', 'shift'].includes(k))[0];

      const matchesCtrl = requiresCtrl ? isCtrl : !isCtrl;
      const matchesAlt = requiresAlt ? isAlt : !isAlt;
      const matchesShift = requiresShift ? isShift : !isShift;
      
      const normalizedBaseKey = baseKey === 'space' ? ' ' : baseKey;
      const matchesBase = pressedKey === normalizedBaseKey;

      if (matchesCtrl && matchesAlt && matchesShift && matchesBase) {
        e.preventDefault();
        binding.action();
        break;
      }
    }
  }, [enabled]);

  useEffect(() => {
    window.addEventListener('keydown', handleKeyDown);
    return () => {
      window.removeEventListener('keydown', handleKeyDown);
    };
  }, [handleKeyDown]);
};
export default useKeyboardShortcuts;