use std::error::Error;

use elefren::status_builder::Visibility;

use crate::error::GroupError;

pub trait LogError {
    fn log_error<S: AsRef<str>>(self, msg: S);
}

impl<V, E: Error> LogError for Result<V, E> {
    fn log_error<S: AsRef<str>>(self, msg: S) {
        match self {
            Ok(_) => {}
            Err(e) => {
                error!("{}: {}", msg.as_ref(), e);
            }
        }
    }
}

pub(crate) fn acct_to_server(acct: &str) -> Option<&str> {
    acct.trim_start_matches('@').split('@').nth(1)
}

pub(crate) fn normalize_acct(acct: &str, group: &str) -> Result<String, GroupError> {
    let acct = acct.trim_start_matches('@').to_lowercase();
    if acct_to_server(&acct).is_some() {
        // already has server
        Ok(acct)
    } else if let Some(gs) = acct_to_server(group) {
        // attach server from the group actor
        Ok(format!("{}@{}", acct, gs))
    } else {
        Err(GroupError::BadConfig(
            format!("Group acct {} is missing server!", group).into(),
        ))
    }
}

#[cfg(test)]
mod test {
    use crate::error::GroupError;
    use crate::utils::{acct_to_server, normalize_acct};

    #[test]
    fn test_acct_to_server() {
        assert_eq!(Some("novak"), acct_to_server("pepa@novak"));
        assert_eq!(Some("banana.co.uk"), acct_to_server("@pepa@banana.co.uk"));
        assert_eq!(None, acct_to_server("probably_local"));
    }

    #[test]
    fn test_normalize_acct() {
        assert_eq!(
            Ok("piggo@piggo.space".into()),
            normalize_acct("piggo", "betty@piggo.space")
        );
        assert_eq!(
            Ok("piggo@piggo.space".into()),
            normalize_acct("@piggo", "betty@piggo.space")
        );
        assert_eq!(
            Ok("piggo@piggo.space".into()),
            normalize_acct("@piggo@piggo.space", "betty@piggo.space")
        );
        assert_eq!(
            Ok("piggo@piggo.space".into()),
            normalize_acct("@piggo@piggo.space", "oggip@mastodon.social")
        );
        assert_eq!(
            Ok("piggo@piggo.space".into()),
            normalize_acct("piggo@piggo.space", "oggip@mastodon.social")
        );
        assert_eq!(
            Ok("piggo@mastodon.social".into()),
            normalize_acct("@piggo", "oggip@mastodon.social")
        );
        assert_eq!(
            Ok("piggo@piggo.space".into()),
            normalize_acct("piggo@piggo.space", "uhh")
        );
        assert_eq!(
            Ok("piggo@piggo.space".into()),
            normalize_acct("piGGgo@pIggo.spaCe", "uhh")
        );
        assert_eq!(
            Ok("piggo@banana.nana".into()),
            normalize_acct("piGGgo", "foo@baNANA.nana")
        );
        assert_eq!(Err(GroupError::BadConfig("_".into())), normalize_acct("piggo", "uhh"));
    }
}

pub trait VisExt: Copy {
    /// Check if is private or direct
    fn is_private(self) -> bool;
}

impl VisExt for Visibility {
    fn is_private(self) -> bool {
        self == Visibility::Direct || self == Visibility::Private
    }
}