// This example shows how to configure connection parameters of the Sparkplug host application.
//
// In order to publish or observe messages for this example, start the SparkplugEdgeNodeConsoleDemo program first.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html .
// Sparkplug examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp .
// Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own
// a commercial license in order to use Online Forums, and we reply to every post.

using System;
using System.Collections.Generic;
using OpcLabs.EasySparkplug;
using OpcLabs.EasySparkplug.OperationModel;
using OpcLabs.EasySparkplug.System;

namespace SparkplugDocExamples.Consumer._EasySparkplugHostApplication
{
    class SystemConnectionParameters
    {
        public static void Main1()
        {
            // Note that the default port for the "mqtt" scheme is 1883.
            var hostDescriptor = new SparkplugHostDescriptor("mqtt://localhost");

            // Pre-create the host application, so that we can configure it.
            EasySparkplugHostApplication hostApplication = EasySparkplugInfrastructure.Instance.FindOrCreateHostApplication(hostDescriptor);
            
            // Configure various connection parameters of the host application.
            hostApplication.SystemConnectionParameters.MqttKeepAliveInterval = 2 * 1000; // 2 seconds
            hostApplication.SystemConnectionParameters.MqttKeepAliveIntervalDebug = 2 * 1000; // 2 seconds
            hostApplication.SystemConnectionParameters.PublishConnectionTimeout = 10 * 1000;   // 10 seconds
            hostApplication.SystemConnectionParameters.ReconnectInterval = 5 * 1000; // 5 seconds

            // Instantiate the consumer object.
            var consumer = new EasySparkplugConsumer();

            Console.WriteLine("Subscribing...");
            // Thanks to implicit conversion, EasySparkplugHostApplication can be used in place of SparkplugHostDescriptor.
            consumer.SubscribeEdgeNodePayload(hostApplication, "easyGroup", "easySparkplugDemo",
                (sender, eventArgs) =>
                {
                    // Handle different types of notifications.
                    Console.WriteLine();
                    switch (eventArgs.NotificationType)
                    {
                        case SparkplugNotificationType.Connect:
                            Console.WriteLine($"Connected to Sparkplug host, client ID: {eventArgs.ClientId}.");
                            break;
                        case SparkplugNotificationType.Disconnect:
                            Console.WriteLine("Disconnected from Sparkplug host.");
                            break;
                        case SparkplugNotificationType.Data:
                        case SparkplugNotificationType.Birth:
                            Console.WriteLine("Received birth or data message from Sparkplug host.");
                            // Display the metrics name and data for each metric delivered in the payload.
                            foreach (KeyValuePair<string, SparkplugMetricElement> pair in eventArgs.Payload)
                                Console.WriteLine($"{pair.Key}: {pair.Value.MetricData}");
                            break;
                        case SparkplugNotificationType.Death:
                            Console.WriteLine("Received death message from Sparkplug host.");
                            break;
                    }
                    if (!eventArgs.Succeeded)
                        Console.WriteLine($"*** Failure: {eventArgs.ErrorMessageBrief}");
                });

            Console.WriteLine("Processing notifications for 60 seconds...");
            System.Threading.Thread.Sleep(60 * 1000);

            Console.WriteLine("Unsubscribing...");
            consumer.UnsubscribeAllPayloads();

            Console.WriteLine("Waiting for 5 seconds...");
            System.Threading.Thread.Sleep(5 * 1000);

            Console.WriteLine("Finished.");
        }
    }
}