Add showing visible members that aren't us

based on very flaky display name checking for now

Peered/NoteEditor/NoteEditingSessionServer.swift

@@ -1,15 +1,39 @@
 import MultipeerConnectivity
 import Foundation
 
+struct OwnPeer {
+	let peer: MCPeerID
+	
+	static var fallback: Self { Self(peer: .init(displayName: "fallback_user")) }
+}
+
+struct Peer: Identifiable {
+	enum ConnectionState {
+		case available
+		case joined
+		case rejected
+		case invitationPending
+	}
+	
+	var id: String {
+		mcPeer.displayName
+	}
+	let mcPeer: MCPeerID
+	var state: ConnectionState
+}
+
 @Observable
 final class NoteEditingSessionServer: NSObject {
 	private let session: MCSession
 	private let browser: MCNearbyServiceBrowser
+	private let ownPeer: OwnPeer
 	
-	init(username: String) {
-		let peer = MCPeerID(displayName: username)
-		browser = .init(peer: peer, serviceType: "peered")
-		session = .init(peer: peer)
+	var visiblePeers: [Peer] = []
+	
+	init(peer: OwnPeer) {
+		ownPeer = peer
+		browser = .init(peer: peer.peer, serviceType: "peered")
+		session = .init(peer: peer.peer)
 		super.init()
 		browser.delegate = self
 	}
@@ -21,6 +45,16 @@ final class NoteEditingSessionServer: NSObject {
 	func stopServer() {
 		browser.stopBrowsingForPeers()
 	}
+	
+	func invite(peer: Peer) {
+		guard peer.state == .available else { return }
+		browser.invitePeer(
+			peer.mcPeer,
+			to: session,
+			withContext: nil, // FIXME: put note here?
+			timeout: 5
+		)
+	}
 }
 
 extension NoteEditingSessionServer: MCNearbyServiceBrowserDelegate {
@@ -29,9 +63,13 @@ extension NoteEditingSessionServer: MCNearbyServiceBrowserDelegate {
 		foundPeer peerID: MCPeerID,
 		withDiscoveryInfo info: [String : String]?
 	) {
-		browser.invitePeer(peerID, to: session, withContext: nil, timeout: 30)
-		print("seeing peer \(peerID.displayName)")
+		guard !visiblePeers.contains(where: { $0.mcPeer == peerID }) && peerID.displayName != ownPeer.peer.displayName else { return }
+		let newPeer = Peer(mcPeer: peerID, state: .available)
+		visiblePeers.append(newPeer)
 	}
 	
-	func browser(_ browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {}
+	func browser(_ browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {
+		guard let peerIdx = visiblePeers.firstIndex(where: { $0.mcPeer == peerID }) else { return }
+		visiblePeers.remove(at: peerIdx)
+	}
 }