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use crate::connections::Connections;
use crate::message::{Message, MessageHeader, MessageType};
use crate::streams::mpsc;

use log::{debug, error};

/// Handles all the sending related to a single user-connection
/// as well as the correct clean up handling once this is dropped
pub struct Sender {
    id: u32,
    tx: tokio::sync::mpsc::UnboundedSender<Message>,
    total_client_cons: std::sync::Arc<Connections<mpsc::StreamWriter<Message>>>,
}

impl Sender {
    /// Creates a new Sender from the given Data
    pub fn new(
        id: u32,
        tx: tokio::sync::mpsc::UnboundedSender<Message>,
        cons: std::sync::Arc<Connections<mpsc::StreamWriter<Message>>>,
    ) -> Self {
        Self {
            id,
            tx,
            total_client_cons: cons,
        }
    }

    /// Adds the Data to the queue to be send to the Server
    pub async fn send(&self, data: Vec<u8>, length: u64) -> bool {
        // Create the right Header and Message
        let header = MessageHeader::new(self.id, MessageType::Data, length);
        let msg = Message::new(header, data);

        self.tx.send(msg).is_ok()
    }

    /// Closes the Sender and therefore consuming itself
    pub async fn close(self) {
        self.total_client_cons.remove(self.id);
        debug!("[Sender][{}] Removed Connection", self.id);

        let close_msg = Message::new(MessageHeader::new(self.id, MessageType::Close, 0), vec![]);
        match self.tx.send(close_msg) {
            Ok(_) => {
                debug!("[Sender][{}] Sent Close", self.id);
            }
            Err(e) => {
                error!("Sending Close-Message for {}: {}", self.id, e);
            }
        };
    }
}

impl Drop for Sender {
    fn drop(&mut self) {
        match self.total_client_cons.remove(self.id) {
            Some(_) => {}
            None => {
                return;
            }
        };
        debug!("[Sender][{}] Removed Connection", self.id);

        let close_msg = Message::new(MessageHeader::new(self.id, MessageType::Close, 0), vec![]);
        if let Err(e) = self.tx.send(close_msg) {
            error!("Sending Close-Message for {}: {}", self.id, e);
        }
    }
}

#[tokio::test]
async fn sender_send() {
    let clients = std::sync::Arc::new(Connections::<mpsc::StreamWriter<Message>>::new());
    let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel();

    let sender = Sender::new(123, tx, clients);

    sender.send(vec![0, 1], 2).await;
    let received = rx.recv().await;
    assert_eq!(true, received.is_some());
    assert_eq!(
        Message::new(MessageHeader::new(123, MessageType::Data, 2), vec![0, 1]),
        received.unwrap(),
    );
}

#[tokio::test]
async fn sender_close() {
    let clients = std::sync::Arc::new(Connections::<mpsc::StreamWriter<Message>>::new());
    let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel();

    let sender = Sender::new(123, tx, clients);
    sender.close().await;

    let received = rx.recv().await;
    assert_eq!(true, received.is_some());
    assert_eq!(
        Message::new(MessageHeader::new(123, MessageType::Close, 0), vec![]),
        received.unwrap(),
    );
}

#[tokio::test]
async fn sender_drop() {
    let (tx, _rx) = mpsc::stream();
    let clients = std::sync::Arc::new(Connections::<mpsc::StreamWriter<Message>>::new());
    clients.set(123, tx);

    let (tx, mut rx) = tokio::sync::mpsc::unbounded_channel();

    let sender = Sender::new(123, tx, clients);
    drop(sender);

    let received = rx.recv().await;
    assert_eq!(true, received.is_some());
    assert_eq!(
        Message::new(MessageHeader::new(123, MessageType::Close, 0), vec![]),
        received.unwrap(),
    );
}