use std::fmt::Display;
use crate::error::GementionError;

pub(crate) enum VerificationStatus {
    Verified {
        endpoint: String,
        source: VerificationSource,
    },

    NotVerified(VerificationFailureReason),
}

impl ToString for VerificationStatus {
    fn to_string(&self) -> String {
        match self {
            Self::Verified { endpoint, source } => format!("verified: {} [{}]", endpoint, source),
            Self::NotVerified(failure) => failure.to_string(),
        }
    }
}

#[derive(Debug, Clone, Copy)]
pub(crate) enum VerificationSource {
    Meta,
    Page,
}

impl Display for VerificationSource {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Meta => write!(f, "source=meta"),
            Self::Page => write!(f, "source=page"),
        }
    }
}

pub(crate) enum VerificationFailureReason {
    /// No titan link to our endpoint exists on this page.
    NoMentionLinkFound,

    /// One or more mention links exist, but they are not to this
    /// endpoint, or for this page.
    MentionLinkIncorrect,

    /// There was an error during the verification process.
    Error(GementionError),
}

impl ToString for VerificationFailureReason {
    fn to_string(&self) -> String {
        match self {
            Self::NoMentionLinkFound => String::from("No mention link found"),
            Self::MentionLinkIncorrect => String::from("Mention link points to wrong target"),
            Self::Error(err) => err.to_string(),
        }
    }
}