use crate::xml::ToXml;
use quick_xml::events::{BytesEnd, BytesStart, Event};

/// Stream error condition
///
/// [Spec](https://xmpp.org/rfcs/rfc6120.html#streams-error-conditions).
pub enum StreamErrorKind {
    /// The server has experienced a misconfiguration or other internal error that prevents it from servicing the stream.
    InternalServerError,
    /// The server is being shut down and all active streams are being closed.
    SystemShutdown,
}
impl StreamErrorKind {
    pub fn from_str(s: &str) -> Option<Self> {
        match s {
            "internal-server-error" => Some(Self::InternalServerError),
            "system-shutdown" => Some(Self::SystemShutdown),
            _ => None,
        }
    }
    pub fn as_str(&self) -> &'static str {
        match self {
            Self::InternalServerError => "internal-server-error",
            Self::SystemShutdown => "system-shutdown",
        }
    }
}

pub struct StreamError {
    pub kind: StreamErrorKind,
}
impl ToXml for StreamError {
    fn serialize(&self, events: &mut Vec<Event<'static>>) {
        events.push(Event::Start(BytesStart::new("stream:error")));
        events.push(Event::Empty(BytesStart::new(format!(
            r#"{} xmlns="urn:ietf:params:xml:ns:xmpp-streams""#,
            self.kind.as_str()
        ))));
        events.push(Event::End(BytesEnd::new("stream:error")));
    }
}