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

import SwiftUI

struct AllNotesScreen: View {
  @AppStorage("peered_username") private var username: String?
  @State private var notes = [Note]()
  @State private var notesClient: NoteEditingSessionClient?
  @State private var ownPeer: OwnPeer?

  var isUsernameValid: Bool {
    !(username.map(\.isEmpty) ?? true)
  }

  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)
              }
            }
          }
        }
      }
      .navigationTitle("Peered")
      .toolbar {
        Button("Create note") {
          NotesStorage().createNote(name: "New Note")
          notes = NotesStorage().loadNotes()
        }
      }
    }
    .onAppear {
      notes = NotesStorage().loadNotes()
      if let username, isUsernameValid {
        setupSession(username: username)
      }
    }
    .onChange(of: username) { _, newUsername in
      guard let newUsername, isUsernameValid else { return }
      setupSession(username: newUsername)
    }
    .sheet(isPresented: .constant(!isUsernameValid)) {
      SetUserNameBottomSheetView(username: $username)
    }
  }

  private func setupSession(username: String) {
    notesClient?.stopBrowsingForNotes()
    let peer = OwnPeer(peer: .init(displayName: username))
    ownPeer = peer
    notesClient = .init(peer: peer.peer)
    notesClient?.startBrowsingForNotes()
  }
}

#Preview {
  AllNotesScreen()
}