//
//  ContentView.swift
//  Peered
//
//  Created by Oskar Chybowski on 11/05/2025.
//

import SwiftUI

extension EnvironmentValues {
	@Entry var ownPeer: OwnPeer = .fallback
}

struct ContentView: View {
	@AppStorage("peered_username") private var username: String = "fallback_user"
	@State private var notes = [Note]()
	@State private var notesClient: NoteEditingSessionClient?
	@State private var ownPeer: OwnPeer?
	
	var isUsernameValid: Bool {
		username != "fallback_user" && !username.isEmpty
	}
	
	var body: some View {
		NavigationStack {
			List {
				Section("Your notes") {
					ForEach(notes) { note in
						NavigationLink(note.name) {
							if let ownPeer {
								NoteEditorScreen(note: note, peer: ownPeer)
							}
						}
					}
				}
				
				if let notesClient {
					Section("External notes") {
						ForEach(notesClient.invitations) { invitation in
							NavigationLink(invitation.noteName) {
								SharedNoteEditor(invitation: invitation, noteClient: notesClient)
							}
						}
					}
				}
			}
			.environment(\.ownPeer, ownPeer ?? .fallback)
			.navigationTitle("Peered")
			.toolbar {
				Button("Create note") {
					NotesStorage().createNote(name: "New Note")
					notes = NotesStorage().loadNotes()
				}
			}
		}
		.onAppear {
			notes = NotesStorage().loadNotes()
			if isUsernameValid {
				setupSession()
			}
		}
		.onChange(of: username) { _, newUsername in
			guard isUsernameValid else { return }
			setupSession()
		}
		.sheet(isPresented: .constant(!isUsernameValid)) {
			SetUserNameBottomSheetView(username: $username)
		}
	}
	
	private func setupSession() {
		notesClient?.stopBrowsingForNotes()
		let peer = OwnPeer(peer: .init(displayName: username))
		ownPeer = peer
		notesClient = .init(peer: peer.peer)
		notesClient?.startBrowsingForNotes()
	}
}

#Preview {
	ContentView()
}