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use anyhow::Context;
use slog::{warn, Logger};
use std::fmt::Debug;
use tokio::sync::mpsc::UnboundedSender;

use mithril_common::{logging::LoggerExtensions, StdResult};

use super::EventMessage;

/// The transmitter service is used to allow inter process channel
/// communication. This service is used to create multiple transmitters.
pub struct TransmitterService<MSG>
where
    MSG: Debug + Sync + Send,
{
    transmitter: UnboundedSender<MSG>,
    logger: Logger,
}

impl<MSG> TransmitterService<MSG>
where
    MSG: Debug + Sync + Send,
{
    /// Instantiate a new Service by passing a MPSC transmitter.
    pub fn new(transmitter: UnboundedSender<MSG>, logger: Logger) -> Self {
        Self {
            transmitter,
            logger: logger.new_with_component_name::<Self>(),
        }
    }

    /// Clone the internal transmitter and return it.
    pub fn get_transmitter(&self) -> UnboundedSender<MSG> {
        self.transmitter.clone()
    }
}

impl TransmitterService<EventMessage> {
    /// Send an [EventMessage].
    pub fn try_send(&self, message: EventMessage) -> StdResult<()> {
        self.get_transmitter()
            .send(message.clone())
            .with_context(|| {
                format!("An error occurred when sending message {message:?} to monitoring.")
            })
    }

    /// Send an [EventMessage].
    ////
    /// An error when sending a message has no impact on the business.
    /// If there is one, a warning is issued so the resulting error may be safely ignored by the caller.
    pub fn send(&self, message: EventMessage) {
        if let Err(e) = self.try_send(message.clone()) {
            warn!(self.logger, "Event message error"; "error" => ?e);
        };
    }
}