import type * as Chain from './Chain.js'
import type * as Token from './Token.js'

/** A supported funding path between two chain-scoped tokens. */
export type Route = {
  /** Token received on Tempo. */
  destination: Token.Resolved
  /** Token supplied by the caller. */
  source: Token.Resolved
}

/** Creates funding routes from destination and source chain-token selections. */
export function from(options: from.Options): Route[] {
  return options.sources.flatMap((source) =>
    source.tokens.flatMap((token) =>
      options.destination.tokens.map((destination) => ({ destination, source: token })),
    ),
  )
}

export declare namespace from {
  /** Funding route definition. */
  type Options = {
    /** Chain and tokens received on Tempo. */
    destination: Chain.Selection
    /** Chains and tokens accepted as funding inputs. */
    sources: readonly Chain.Selection[]
  }
}