Note Sharing, distributing updates

Peered/NoteEditor/NoteEditingSessionServer.swift

@@ -1,5 +1,6 @@
 import MultipeerConnectivity
 import Foundation
+import Combine
 
 struct OwnPeer {
 	let peer: MCPeerID
@@ -29,6 +30,7 @@ final class NoteEditingSessionServer: NSObject {
 	private let ownPeer: OwnPeer
 	
 	var visiblePeers: [Peer] = []
+	let noteChangesEmitter = PassthroughSubject<String, Never>()
 	
 	init(peer: OwnPeer) {
 		ownPeer = peer
@@ -36,6 +38,7 @@ final class NoteEditingSessionServer: NSObject {
 		session = .init(peer: peer.peer)
 		super.init()
 		browser.delegate = self
+		session.delegate = self
 	}
 	
 	func startServer() {
@@ -46,14 +49,17 @@ final class NoteEditingSessionServer: NSObject {
 		browser.stopBrowsingForPeers()
 	}
 	
-	func invite(peer: Peer) {
+	func invite(peer: Peer, to note: NoteInvitation.NoteContent) {
 		guard peer.state == .available else { return }
 		browser.invitePeer(
 			peer.mcPeer,
 			to: session,
-			withContext: nil, // FIXME: put note here?
+			withContext: try! JSONEncoder().encode(note),
 			timeout: 5
 		)
+		
+		let idxToUpdate = visiblePeers.firstIndex(where: { $0.mcPeer == peer.mcPeer })!
+		visiblePeers[idxToUpdate].state = .invitationPending
 	}
 }
 
@@ -73,3 +79,46 @@ extension NoteEditingSessionServer: MCNearbyServiceBrowserDelegate {
 		visiblePeers.remove(at: peerIdx)
 	}
 }
+
+extension NoteEditingSessionServer: MCSessionDelegate {
+	func session(
+		_ session: MCSession,
+		peer peerID: MCPeerID,
+		didChange state: MCSessionState
+	) {
+		
+	}
+	
+	func session(
+		_ session: MCSession,
+		didReceive stream: InputStream,
+		withName streamName: String,
+		fromPeer peerID: MCPeerID
+	) {
+		
+	}
+	
+	func session(
+		_ session: MCSession,
+		didStartReceivingResourceWithName resourceName: String,
+		fromPeer peerID: MCPeerID,
+		with progress: Progress
+	) {
+		
+	}
+	
+	func session(
+		_ session: MCSession,
+		didFinishReceivingResourceWithName resourceName: String,
+		fromPeer peerID: MCPeerID,
+		at localURL: URL?,
+		withError error: (any Error)?
+	) {
+		
+	}
+	
+	func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {
+		guard let note = String(data: data, encoding: .utf8) else { fatalError() }
+		noteChangesEmitter.send(note)
+	}
+}