//! Mock sender implementations for testing.

use bytes::Bytes;
use commonware_cryptography::PublicKey;
use commonware_p2p::{Recipients, Sender};
use thiserror::Error;

/// Errors that can be returned by [Failing].
#[derive(Debug, Error)]
pub enum Error {
    #[error("send failed")]
    Failed,
}

/// A sender that always fails with [Error::Canceled].
#[derive(Clone, Debug)]
pub struct Failing<P: PublicKey> {
    _phantom: std::marker::PhantomData<P>,
}

impl<P: PublicKey> Failing<P> {
    /// Creates a new failing sender.
    pub fn new() -> Self {
        Self {
            _phantom: std::marker::PhantomData,
        }
    }
}

impl<P: PublicKey> Sender for Failing<P> {
    type PublicKey = P;
    type Error = Error;

    async fn send(
        &mut self,
        _recipients: Recipients<P>,
        _message: Bytes,
        _priority: bool,
    ) -> Result<Vec<P>, Self::Error> {
        Err(Error::Failed)
    }
}