import type { Node } from 'web-tree-sitter';
import type { SelectionNode } from './selection.js';
const TYPE = 'selection_set' as const;



// ================================================================
// ================================================================
//
//                           SelectionSetNode
//
//        GraphQL selection set node
//
// ================================================================
// ================================================================


/**
 * Represents a selection set in the GraphQL AST.
 * 
 * Children:
 *   {@link SelectionNode}
 * 
 */
export interface SelectionSetNode extends Node {
  type: typeof TYPE;
}


// ================================================================
// ================================================================
//
//                           Type Guard
//
// ================================================================
// ================================================================


/**
 * Type guard to check if a node is a {@link SelectionSetNode}.
 * 
 * @param node - The node to check
 * @returns True if the node is a {@link SelectionSetNode}
 * 
 * @example
 * ```typescript
 * if (isSelectionSetNode(node)) {
 *   // TypeScript now knows node is SelectionSetNode
 *   console.log(node.type); // 'selection_set'
 * }
 * ```
 */
export function isSelectionSetNode(node: unknown): node is SelectionSetNode {
  return (node as any)?.type === TYPE;
}


// ================================================================
// ================================================================
//
//                           Constructor
//
// ================================================================
// ================================================================


/**
 * Creates a new {@link SelectionSetNode} with the specified properties.
 * 
 * @param props - The node properties
 * @param props.selection - {@link SelectionNode}
 * @returns A new {@link SelectionSetNode}
 * 
 * @example
 * ```typescript
 * const node = SelectionSetNode({
 *   // properties...
 * });
 * ```
 */
export function SelectionSetNode(props: Omit<SelectionSetNode, 'type'>): SelectionSetNode {
  return {
    type: TYPE,
    ...props
  };
}