import type { VirtualRouteNode } from './types'

// this is adapted from vite/src/node/config.ts

export type ConfigFnObject<TConfig> = () => TConfig
export type ConfigFnPromise<TConfig> = () => Promise<TConfig>
export type ConfigFn<TConfig> = () => TConfig | Promise<TConfig>

export type ConfigExport<TConfig> =
  | TConfig
  | Promise<TConfig>
  | ConfigFnObject<TConfig>
  | ConfigFnPromise<TConfig>
  | ConfigFn<TConfig>

export type VirtualRouteSubtreeConfig = Array<VirtualRouteNode>

/**
 * Type helper to make it easier to use __virtual.ts
 * accepts a direct {@link VirtualRouteSubtreeConfig} object, or a function that returns it.
 */
export function defineVirtualSubtreeConfig(
  config: VirtualRouteSubtreeConfig,
): VirtualRouteSubtreeConfig
export function defineVirtualSubtreeConfig(
  config: Promise<VirtualRouteSubtreeConfig>,
): Promise<VirtualRouteSubtreeConfig>
export function defineVirtualSubtreeConfig(
  config: ConfigFnObject<VirtualRouteSubtreeConfig>,
): ConfigFnObject<VirtualRouteSubtreeConfig>
export function defineVirtualSubtreeConfig(
  config: ConfigExport<VirtualRouteSubtreeConfig>,
): ConfigExport<VirtualRouteSubtreeConfig>
export function defineVirtualSubtreeConfig(
  config: ConfigExport<VirtualRouteSubtreeConfig>,
): ConfigExport<VirtualRouteSubtreeConfig> {
  return config
}