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use core::fmt;
use std::error::Error;

#[derive(Debug, Eq, PartialEq, Clone)]
pub enum MessageBuildError {
    UserWithoutHost,
    MissingCommand,
}

impl fmt::Display for MessageBuildError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let message = match self {
            MessageBuildError::UserWithoutHost => {
                "irc prefix can only contain a user if host is also present"
            }
            MessageBuildError::MissingCommand => "irc message requires an command",
        };

        write!(f, "{}", message)
    }
}

impl Error for MessageBuildError {}

#[derive(Debug, Eq, PartialEq, Clone)]
pub enum InvalidIrcFormatError {
    Tag(String),
    NoTagEnd(String),
}

impl fmt::Display for InvalidIrcFormatError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            InvalidIrcFormatError::Tag(raw) => write!(f, "Invalid tags format: {}", raw),
            InvalidIrcFormatError::NoTagEnd(raw_message) => write!(
                f,
                "No space to end the Tag found in message: {}",
                raw_message
            ),
        }
    }
}

impl Error for InvalidIrcFormatError {}