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use super::{Channel, Encodable};
use std::io::{Result, Write};

/// Enables emote-only mode (only emoticons may be used in chat).

#[non_exhaustive]
#[derive(Debug, Copy, Clone, PartialEq, Ord, PartialOrd, Eq, Hash)]
#[cfg_attr(feature = "serde", derive(::serde::Deserialize))]
pub struct EmoteOnly<'a> {
    pub(crate) channel: &'a str,
}

/// Enables emote-only mode (only emoticons may be used in chat).

///

/// Use [emote_only_off] to disable.

///

/// [emote_only_off]: ./fn.emote_only_off.html

pub const fn emote_only(channel: &str) -> EmoteOnly<'_> {
    EmoteOnly { channel }
}

impl<'a> Encodable for EmoteOnly<'a> {
    fn encode<W>(&self, buf: &mut W) -> Result<()>
    where
        W: Write + ?Sized,
    {
        write_cmd!(buf, Channel(self.channel) => "/emoteonly")
    }
}

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

    #[test]
    fn emote_only_encode() {
        test_encode(emote_only("#museun"), "PRIVMSG #museun :/emoteonly\r\n");
    }

    #[test]
    fn emote_only_ensure_channel_encode() {
        test_encode(emote_only("museun"), "PRIVMSG #museun :/emoteonly\r\n")
    }

    #[test]
    #[cfg(feature = "serde")]
    fn emote_only_serde() {
        test_serde(emote_only("#museun"), "PRIVMSG #museun :/emoteonly\r\n");
    }

    #[test]
    #[cfg(feature = "serde")]
    fn emote_only_ensure_channel_serde() {
        test_serde(emote_only("museun"), "PRIVMSG #museun :/emoteonly\r\n")
    }
}