another.im-ios/ConversationsClassic/AppData/Store/ChatSettingsStore.swift

import Combine
import Foundation
import GRDB
import Photos
import SwiftUI

@MainActor
final class ChatSettingsStore: ObservableObject {
    @Published var chat: Chat?

    private let client: Client
    private let roster: Roster

    private var chatCancellable: AnyCancellable?

    init(roster: Roster, client: Client) {
        self.client = client
        self.roster = roster

        subscribe()
    }
}

extension ChatSettingsStore {
    func setSecured(_ secured: Bool) {
        Task {
            try? await chat?.setEncrypted(secured)
        }
    }
}

// MARK: - Processing attachments
private extension ChatSettingsStore {
    func subscribe() {
        chatCancellable = ValueObservation.tracking(Chat
            .filter(Column("account") == roster.bareJid && Column("participant") == roster.contactBareJid)
            .fetchOne
        )
        .publisher(in: Database.shared.dbQueue, scheduling: .immediate)
        .receive(on: DispatchQueue.main)
        .sink { _ in
        } receiveValue: { [weak self] chat in
            self?.chat = chat
        }
    }
}