import {
  type OpenAPIObject,
  type OperationObject,
  type PathItemObject,
  type ReferenceObject,
  type SchemaObject,
} from "openapi3-ts";

import { type TaggedSchema } from "../schemas.js";
import { isNotReferenceObject, isTruthy } from "../util.js";

export type TaggedSchemaObject = SchemaObject & TaggedSchema;
export type MaybeSchemaHolder = { schema?: SchemaObject | ReferenceObject };
export type SchemaHolder = { schema: SchemaObject | ReferenceObject };

export function operations(path: PathItemObject): Array<OperationObject> {
  return [
    path.get,
    path.put,
    path.post,
    path.delete,
    path.options,
    path.head,
    path.patch,
    path.trace,
  ].filter(isTruthy);
}

export function mapPathItems<T>(
  oas: OpenAPIObject,
  fn: (path: PathItemObject) => T
): Array<T> {
  return Object.values(oas.paths || {})
    .filter(isNotReferenceObject)
    .flatMap(fn);
}