examples/tv-casting-app/darwin/TvCasting/TvCasting/CommissionerDiscoveryViewModel.swift

/**
 *
 *    Copyright (c) 2020-2022 Project CHIP Authors
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

import Foundation
import os.log

class CommissionerDiscoveryViewModel: ObservableObject {
    let Log = Logger(subsystem: "com.matter.casting",
                     category: "CommissionerDiscoveryViewModel")
    
    @Published var commissioners: [DiscoveredNodeData] = []
    
    @Published var discoveryRequestStatus: Bool?;
    
    func discoverAndUpdate() {
        if let castingServerBridge = CastingServerBridge.getSharedInstance()
        {
            castingServerBridge.discoverCommissioners(DispatchQueue.main, discoveryRequestSentHandler:  { (result: Bool) -> () in
                self.discoveryRequestStatus = result
            })
        }
        
        Task {
            try? await Task.sleep(nanoseconds: 5_000_000_000)  // Wait for commissioners to respond
            updateCommissioners()
        }
    }
    
    private func updateCommissioners() {
        if let castingServerBridge = CastingServerBridge.getSharedInstance()
        {
            var i: Int32 = 0
            var commissioner: DiscoveredNodeData?;
            repeat {
                castingServerBridge.getDiscoveredCommissioner(i, clientQueue: DispatchQueue.main, discoveredCommissionerHandler: { (result: DiscoveredNodeData?) -> () in
                    commissioner = result;
                    if(commissioner != nil){
                        if(self.commissioners.contains(commissioner!))
                        {
                            self.Log.info("Skipping previously discovered commissioner \(commissioner!.description)")
                        }
                        else
                        {
                            self.commissioners.append(commissioner!)
                        }
                    }
                })
                i += 1
            } while(commissioner != nil)
        }
    }
}