export type DirectoryEntry = {
  name: string
  path: string
  type: "file" | "directory"
}

export type ProjectFileSystem = {
  readText(filePath: string): Promise<string>
  writeText(filePath: string, content: string): Promise<void>
  mkdir(dirPath: string): Promise<void>
  readdir(dirPath: string): Promise<DirectoryEntry[]>
  exists(filePath: string): Promise<boolean>
  stat(filePath: string): Promise<{ type: "file" | "directory" }>
}

export function requireProjectFileSystem(fs: ProjectFileSystem | undefined): ProjectFileSystem {
  if (fs === undefined) {
    throw new Error("A ProjectFileSystem adapter is required.")
  }

  return fs
}