// This example subscribes to changes of 2 items separately, and displays rich information available with each item changed
// event notification.
//
// Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Latest/examples.html .
// OPC client and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-QuickOPC-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.Diagnostics;
using System.Threading;
using OpcLabs.EasyOpc.DataAccess;
using OpcLabs.EasyOpc.DataAccess.OperationModel;

namespace DocExamples.DataAccess._EasyDAItemChangedEventArgs
{
    class General
    {
        public static void Main1()
        {
            // Instantiate the client object.
            using (var client = new EasyDAClient())
            {
                var eventHandler = new EasyDAItemChangedEventHandler(client_ItemChanged);
                client.ItemChanged += eventHandler;

                Console.WriteLine("Subscribing items...");
                client.SubscribeItem("", "OPCLabs.KitServer.2", "Simulation.Random", 5 * 1000);
                client.SubscribeItem("", "OPCLabs.KitServer.2", "Trends.Ramp (1 min)", 5 * 1000);

                Console.WriteLine("Processing item changed events for 1 minute...");
                Thread.Sleep(60 * 1000);
            }
        }

        static void client_ItemChanged(object sender, EasyDAItemChangedEventArgs e)
        {
            Console.WriteLine();
            Console.WriteLine($"e.Arguments.State: {e.Arguments.State}");
            Console.WriteLine($"e.Arguments.ServerDescriptor.MachineName: {e.Arguments.ServerDescriptor.MachineName}");
            Console.WriteLine($"e.Arguments.ServerDescriptor.ServerClass: {e.Arguments.ServerDescriptor.ServerClass}");
            Console.WriteLine($"e.Arguments.ItemDescriptor.ItemId: {e.Arguments.ItemDescriptor.ItemId}");
            Console.WriteLine($"e.Arguments.ItemDescriptor.AccessPath: {e.Arguments.ItemDescriptor.AccessPath}");
            Console.WriteLine($"e.Arguments.ItemDescriptor.RequestedDataType: {e.Arguments.ItemDescriptor.RequestedDataType}");
            Console.WriteLine($"e.Arguments.GroupParameters.Locale: {e.Arguments.GroupParameters.Locale}");
            Console.WriteLine($"e.Arguments.GroupParameters.RequestedUpdateRate: {e.Arguments.GroupParameters.RequestedUpdateRate}");
            Console.WriteLine($"e.Arguments.GroupParameters.PercentDeadband: {e.Arguments.GroupParameters.PercentDeadband}");
            if (e.Succeeded)
            {
                Debug.Assert(!(e.Vtq is null));
                Console.WriteLine($"e.Vtq.Value: {e.Vtq.Value}");
                Console.WriteLine($"e.Vtq.Timestamp: {e.Vtq.Timestamp}");
                Console.WriteLine($"e.Vtq.TimestampLocal: {e.Vtq.TimestampLocal}");
                Console.WriteLine($"e.Vtq.Quality: {e.Vtq.Quality}");
            }
            else
            {
                Debug.Assert(!(e.Exception is null));
                Console.WriteLine($"e.Exception.Message: {e.Exception.Message}");
                Console.WriteLine($"e.Exception.Source: {e.Exception.Source}");
            }
        }


        // Example output:
        //
        //Processing item changed events for 1 minute...
        //
        //e.Arguments.State: 
        //e.Arguments.ServerDescriptor.MachineName: 
        //e.Arguments.ServerDescriptor.ServerClass: OPCLabs.KitServer.2
        //e.Arguments.ItemDescriptor.ItemId: Simulation.Random
        //e.Arguments.ItemDescriptor.AccessPath: 
        //e.Arguments.ItemDescriptor.RequestedDataType: Empty
        //e.Arguments.GroupParameters.Locale: 0
        //e.Arguments.GroupParameters.RequestedUpdateRate: 5000
        //e.Arguments.GroupParameters.PercentDeadband: 0
        //e.Vtq.Value: 0.00125125888851588
        //e.Vtq.Timestamp: 4/10/2020 4:35:25 PM
        //e.Vtq.TimestampLocal: 4/10/2020 6:35:25 PM
        //e.Vtq.Quality: GoodNonspecific (192)
        //
        //e.Arguments.State: 
        //e.Arguments.ServerDescriptor.MachineName: 
        //e.Arguments.ServerDescriptor.ServerClass: OPCLabs.KitServer.2
        //e.Arguments.ItemDescriptor.ItemId: Trends.Ramp(1 min)
        //e.Arguments.ItemDescriptor.AccessPath: 
        //e.Arguments.ItemDescriptor.RequestedDataType: Empty
        //e.Arguments.GroupParameters.Locale: 0
        //e.Arguments.GroupParameters.RequestedUpdateRate: 5000
        //e.Arguments.GroupParameters.PercentDeadband: 0
        //e.Vtq.Value: 0.431881904602051
        //e.Vtq.Timestamp: 4/10/2020 4:35:25 PM
        //e.Vtq.TimestampLocal: 4/10/2020 6:35:25 PM
        //e.Vtq.Quality: GoodNonspecific (192)
        //
        //...
    }
}