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//
// Wildland Project
//
// Copyright © 2022 Golem Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 as published by
// the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

use std::num::NonZeroUsize;

use ring_channel::{ring_channel, RingReceiver, RingSender};
use wildland_corex::dfs::interface::events::{Event, EventReceiver};

use super::events_system::EventSystem;

#[derive(Clone)]
pub struct RingEventSystem {
    tx: RingSender<Event>,
    rx: RingReceiver<Event>,
}

impl Default for RingEventSystem {
    fn default() -> Self {
        let (tx, rx) = ring_channel(NonZeroUsize::new(100).unwrap());
        Self { tx, rx }
    }
}

impl RingEventSystem {
    pub fn get_receiver(&self) -> RingEventReceiver {
        RingEventReceiver {
            rx: self.rx.clone(),
        }
    }
}

impl EventSystem for RingEventSystem {
    fn send_event(&mut self, event: Event) {
        let _ = self.tx.send(event);
    }

    fn clone_box(&self) -> Box<dyn EventSystem> {
        Box::new(self.clone())
    }
}

pub struct RingEventReceiver {
    rx: RingReceiver<Event>,
}

impl EventReceiver for RingEventReceiver {
    fn recv(&mut self) -> Option<Event> {
        self.rx.recv().ok()
    }
}