use std::io::Cursor;

use crate::error;
use crate::frame::events::ServerEvent;
use crate::frame::FromCursor;

#[derive(Debug)]
pub struct BodyResEvent {
    pub event: ServerEvent,
}

impl FromCursor for BodyResEvent {
    fn from_cursor(mut cursor: &mut Cursor<&[u8]>) -> error::Result<BodyResEvent> {
        let event = ServerEvent::from_cursor(&mut cursor)?;

        Ok(BodyResEvent { event: event })
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::frame::events::*;
    use crate::frame::traits::FromCursor;
    use std::io::Cursor;

    #[test]
    fn body_res_event() {
        let bytes = [
            // TOPOLOGY_CHANGE
            0, 15, 84, 79, 80, 79, 76, 79, 71, 89, 95, 67, 72, 65, 78, 71, 69, // NEW_NODE
            0, 8, 78, 69, 87, 95, 78, 79, 68, 69, //
            4, 127, 0, 0, 1, 0, 0, 0, 1, // inet - 127.0.0.1:1
        ];
        let mut cursor: Cursor<&[u8]> = Cursor::new(&bytes);
        let event = BodyResEvent::from_cursor(&mut cursor).unwrap().event;

        match event {
            ServerEvent::TopologyChange(ref tc) => {
                assert_eq!(tc.change_type, TopologyChangeType::NewNode);
                assert_eq!(format!("{:?}", tc.addr.addr), "V4(127.0.0.1:1)");
            }
            _ => panic!("should be topology change event"),
        }
    }
}