import { type Repository } from "./dataTypes.ts"

let cachedFlatFiles: Array<FlatFileEntry> | null = null
export type FlatFileEntry = {
  file: string,
  refName: string,
  repoName: string,
  type: 'branch' | 'tag',
}

export default (repos: Array<Repository>) : Array<FlatFileEntry> => {
  if (cachedFlatFiles !== null) { return cachedFlatFiles }

  const branches: FlatFileEntry[] = repos.flatMap((repo) => {
    return repo.branches.flatMap((branch) => {
      return Array.from(branch.fileList.keys()).map((file) => {
        return {
          file,
          refName: branch.name,
          repoName: repo.name,
          type: 'branch',
        }
      })
    })
  })

  const tags: FlatFileEntry[] = repos.flatMap((repo) => {
    return repo.tags.flatMap((tag) => {
      return Array.from(tag.fileList.keys()).map((file) => {
        return {
          file,
          refName: tag.name,
          repoName: repo.name,
          type: 'tag',
        }
      })
    })
  })

  cachedFlatFiles = [...branches, ...tags]

  return cachedFlatFiles
}