//! Binary Byzantine agreement protocol from a common coin protocol.

use std::collections::VecDeque;
use proto::AgreementMessage;

pub struct Agreement {
    input: Option<bool>
}

impl Agreement {
    pub fn set_input(&mut self, input: bool) {
        self.input = Some(input);
    }

    pub fn has_input(&self) -> bool {
        self.input.is_some()
    }

    /// Receive input from a remote node.
    pub fn on_input(&self, _message: AgreementMessage) ->
        Result<VecDeque<AgreementMessage>, Error>
    {
        Err(Error::NotImplemented)
    }
}

#[derive(Clone, Debug)]
pub enum Error {
    NotImplemented
}