open-TestChatApp-iOS/Shared/Core/ChatListViewModel.swift

//
//  ChatListViewModel.swift
//  Chat
//
//  Created by Sergey Tarasov on 25.07.2022.
//

import Foundation
import XMPPFramework
import XMPPFrameworkSwift

class ChatListViewModel: ObservableObject {
    let manager = RosterManager()

    @Published var users: [User] = []

    var nicknames: [String] {
        return users.map({ $0.nickname.isEmpty ? $0.jidString : $0.nickname })
    }

    var timer: Timer?

    init() {
        self.timer = Timer.scheduledTimer(
            timeInterval: 2,
            target: self,
            selector: #selector(fetchChatList),
            userInfo: nil,
            repeats: true
        )
    }

    @objc
    public func fetchChatList() {
        if users.isEmpty {
            let xmppUsers = manager.storage.sortedUsersByAvailabilityName() as? [XMPPUser]
            guard let users = xmppUsers?.compactMap({ User(jidString: $0.jid.bare, nickname: $0.nickname) }) else {
                return
            }
            self.users = users
        } else {
            self.timer?.invalidate()
        }
    }
}