pub enum Did {
  Web(String),
  Plc(String),
}

enum DidError {
  UnknownMethod,
  MalformedDid,
}

impl Did {
  fn from(did: String) -> Result<Did, DidError> {
    if did.starts_with("did:plc:") {
      return Ok(Did::Plc(String::from(did[8..])));
    } else if did.starts_with("did:web:") {
      return Ok(Did::Plc(String::from(did[8..])));
    } else if did.starts_with("did:") {
      return Err(DidError::UnknownMethod);
    } else {
      return Err(DidError::MalformedDid);
    }
  }
}

pub struct User {
  handle: Option<String>,
  did: Did,
  pds: String,
}

enum UserFromErr {
  InvalidHandle,
  NoDidForHandle,
  HandleNotBidirectional,
  DidParseError(DidError),
  DidNotBidirectional,
  NoPds,
}

impl User {
  fn fromHandle(handle: String) -> Result<User, UserFromErr> {}

  fn fromDid(did: String) -> Result<User, UserFromErr> {}
}