import { useEffect } from 'react';
import { useEditor } from '@craftjs/core';
import { findDeletableTarget } from '../utils/craft-helpers';

function isInputFocused(): boolean {
  const el = document.activeElement;
  if (!el) return false;
  const tag = el.tagName.toLowerCase();
  if (tag === 'input' || tag === 'textarea' || tag === 'select') return true;
  if ((el as HTMLElement).isContentEditable) return true;
  return false;
}

export function useKeyboardShortcuts() {
  const { actions, query } = useEditor((state) => {
    const selectedIds = state.events.selected;
    const selectedId = selectedIds ? Array.from(selectedIds)[0] : null;
    return { selectedId };
  });

  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      // Skip when typing in inputs
      if (isInputFocused()) return;

      const ctrl = e.ctrlKey || e.metaKey;

      // Ctrl+Z: Undo
      if (ctrl && !e.shiftKey && e.key === 'z') {
        e.preventDefault();
        try {
          actions.history.undo();
        } catch (err) {
          // No more undo steps
        }
        return;
      }

      // Ctrl+Y or Ctrl+Shift+Z: Redo
      if ((ctrl && e.key === 'y') || (ctrl && e.shiftKey && e.key === 'z') || (ctrl && e.shiftKey && e.key === 'Z')) {
        e.preventDefault();
        try {
          actions.history.redo();
        } catch (err) {
          // No more redo steps
        }
        return;
      }

      // Delete/Backspace: delete selected node
      if (e.key === 'Delete' || e.key === 'Backspace') {
        e.preventDefault();
        try {
          const selected = query.getEvent('selected').all();
          if (selected.length > 0) {
            const target = findDeletableTarget(query, selected[0]);
            if (target) actions.delete(target);
          }
        } catch (err) {
          console.error('Delete failed:', err);
        }
        return;
      }

      // Ctrl+D: duplicate selected
      if (ctrl && (e.key === 'd' || e.key === 'D')) {
        e.preventDefault();
        try {
          const selected = query.getEvent('selected').all();
          if (selected.length > 0) {
            const nodeId = selected[0];
            if (nodeId !== 'ROOT') {
              const node = query.node(nodeId).get();
              const parentId = node?.data?.parent;
              if (parentId) {
                const tree = query.node(nodeId).toNodeTree();
                actions.addNodeTree(tree, parentId);
              }
            }
          }
        } catch (err) {
          console.error('Duplicate failed:', err);
        }
        return;
      }

      // Escape: deselect all
      if (e.key === 'Escape') {
        e.preventDefault();
        try {
          actions.clearEvents();
        } catch (err) {
          // Ignore
        }
        return;
      }
    };

    document.addEventListener('keydown', handleKeyDown);
    return () => document.removeEventListener('keydown', handleKeyDown);
  }, [actions, query]);
}