import { Collection, OmitVertexProperties, PickVertexProperties, Vertex } from "./vertex.js";
import { EdgeMultiplicity, EdgeWrapper } from "./edges.js";
import { Tail } from "./util.js";

//#region src/core/interfaces/vertices/util/common.d.ts
type IsAny<T> = 0 extends (1 & T) ? true : false;
/**
 * Picks all properties of a vertex that are edges to other vertices. (we ignore explicit any types)
 */
type PickEdges<V extends Vertex<Collection>> = { [K in keyof V as NonNullable<V[K]> extends EdgeWrapper<EdgeMultiplicity, any> ? IsAny<V[K]> extends true ? never : K : never]: V[K] };
/**
 * Omits all properties of a vertex that are edges to other vertices.
 */
type OmitEdges<V extends Vertex<Collection>> = PickVertexProperties<V> & OmitVertexProperties<{ [K in keyof V as NonNullable<V[K]> extends EdgeWrapper<EdgeMultiplicity, any> ? never : K]: V[K] }>;
declare const SELECT_KEY = "select";
type SelectKey = typeof SELECT_KEY;
declare const EXPAND_KEY = "expand";
type ExpandKey = typeof EXPAND_KEY;
type InvalidEdgeMessage = 'INVALID VERTEX EDGE';
type RemoveNeverValues<T extends object> = { [K in keyof T as T[K] extends never ? never : K]: T[K] };
type DepthDecrementMap = [never, 0, 1, 2, 3];
type SupportedDepths = DepthDecrementMap[number];
type MaxDepth = Tail<DepthDecrementMap>;
type MinDepth = Extract<SupportedDepths, 0>;
type Decrement<T extends SupportedDepths> = DepthDecrementMap[T];
//#endregion
export { Decrement, EXPAND_KEY, ExpandKey, InvalidEdgeMessage, MaxDepth, MinDepth, OmitEdges, PickEdges, RemoveNeverValues, SELECT_KEY, SelectKey, SupportedDepths };
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