use validator::validate_email;

#[derive(Debug)]
pub struct UserEmail(pub String);

impl UserEmail {
  pub fn parse(s: String) -> Result<UserEmail, String> {
    if s.trim().is_empty() {
      return Err("Email can not be empty or whitespace".to_string());
    }

    if validate_email(&s) {
      Ok(Self(s))
    } else {
      Err("Invalid email".to_string())
    }
  }
}

impl AsRef<str> for UserEmail {
  fn as_ref(&self) -> &str {
    &self.0
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn empty_string_is_rejected() {
    let email = "".to_string();
    assert!(UserEmail::parse(email).is_err());
  }

  #[test]
  fn email_missing_at_symbol_is_rejected() {
    let email = "helloworld.com".to_string();
    assert!(UserEmail::parse(email).is_err());
  }

  #[test]
  fn email_missing_subject_is_rejected() {
    let email = "@domain.com".to_string();
    assert!(UserEmail::parse(email).is_err());
  }
}