import isConstant from '../isConstant';
import { FormContextType, RJSFSchema, StrictRJSFSchema, ValidatorType, Experimental_CustomMergeAllOf } from '../types';
import retrieveSchema from './retrieveSchema';

/** Checks to see if the `schema` combination represents a select
 *
 * @param validator - An implementation of the `ValidatorType` interface that will be used when necessary
 * @param theSchema - The schema for which check for a select flag is desired
 * @param [rootSchema] - The root schema, used to primarily to look up `$ref`s
 * @param [experimental_customMergeAllOf] - Optional function that allows for custom merging of `allOf` schemas
 * @returns - True if schema contains a select, otherwise false
 */
export default function isSelect<T = any, S extends StrictRJSFSchema = RJSFSchema, F extends FormContextType = any>(
  validator: ValidatorType<T, S, F>,
  theSchema: S,
  rootSchema: S = {} as S,
  experimental_customMergeAllOf?: Experimental_CustomMergeAllOf<S>
) {
  const schema = retrieveSchema<T, S, F>(validator, theSchema, rootSchema, undefined, experimental_customMergeAllOf);
  const altSchemas = schema.oneOf || schema.anyOf;
  if (Array.isArray(schema.enum)) {
    return true;
  }
  if (Array.isArray(altSchemas)) {
    return altSchemas.every((altSchemas) => typeof altSchemas !== 'boolean' && isConstant(altSchemas));
  }
  return false;
}