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use super::session::{Session, ReceiptRequest, OutstandingReceipt};
use super::subscription::{Subscription, AckMode};
use super::frame::Frame;
use super::header::HeaderList;
use super::option_setter::OptionSetter;

pub struct SubscriptionBuilder<'a, T: 'static> {
    pub session: &'a mut Session<T>,
    pub destination: String,
    pub ack_mode: AckMode,
    pub headers: HeaderList,
    pub receipt_request: Option<ReceiptRequest>,
}

impl<'a, T> SubscriptionBuilder<'a, T>
    where
        T: tokio_io::AsyncWrite + tokio_io::AsyncRead + Send + 'static,
{
    pub fn new(session: &'a mut Session<T>, destination: String) -> Self {
        SubscriptionBuilder {
            session: session,
            destination: destination,
            ack_mode: AckMode::Auto,
            headers: HeaderList::new(),
            receipt_request: None,
        }
    }

    #[allow(dead_code)]
    pub fn start(mut self) -> String {
        let next_id = self.session.generate_subscription_id();
        let subscription = Subscription::new(
            next_id,
            &self.destination,
            self.ack_mode,
            self.headers.clone(),
        );
        let mut subscribe_frame =
            Frame::subscribe(&subscription.id, &self.destination, self.ack_mode);

        subscribe_frame.headers.concat(&mut self.headers);

        self.session.send_frame(subscribe_frame.clone());

        debug!(
            "Registering callback for subscription id '{}' from builder",
            subscription.id
        );
        let id_to_return = subscription.id.to_string();
        self.session
            .state
            .subscriptions
            .insert(subscription.id.to_string(), subscription);
        if self.receipt_request.is_some() {
            let request = self.receipt_request.unwrap();
            self.session
                .state
                .outstanding_receipts
                .insert(request.id, OutstandingReceipt::new(subscribe_frame.clone()));
        }
        id_to_return
    }

    pub fn with<O>(self, option_setter: O) -> SubscriptionBuilder<'a, T>
        where
            O: OptionSetter<SubscriptionBuilder<'a, T>>,
    {
        option_setter.set_option(self)
    }
}