package main

import (
	"context"

	"code.ivysaur.me/libnmdc"
)

// upstreamWorker handles an NMDC connection.
// It blocks on the current thread, caller can background it with 'go'.
func upstreamWorker(ctx context.Context, hubAddress, username string, responseChan chan<- libnmdc.HubEvent) {

	interiorChan := make(chan libnmdc.HubEvent, 0)

	conn := libnmdc.ConnectAsync(
		&libnmdc.HubConnectionOptions{
			Address: libnmdc.HubAddress(hubAddress),
			Self: &libnmdc.UserInfo{
				Nick:          username,
				ClientTag:     AppName,
				ClientVersion: AppVersion,
			},
		},
		interiorChan,
	)

	for {
		select {
		case <-ctx.Done():
			conn.Disconnect()
			ctx = nil // prevent hitting this case again repeatedly - closed channel reads immediately, nil channel blocks forever

		case evt := <-interiorChan:
			responseChan <- evt // forward

			if evt.StateChange == libnmdc.CONNECTIONSTATE_DISCONNECTED && ctx.Err() != nil {
				// We're done here
				return
			}

		}

	}
}