// This example shows how to read a range of values from an array.

using System;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples._UAIndexRangeList
{
    partial class Usage
    {
        public static void ReadValue()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            // Instantiate the client object
            var client = new EasyUAClient();

            // Obtain the value, indicating that just the elements 2 to 4 should be returned
            object value;
            try
            {
                value = client.ReadValue(
                    new UAReadArguments(
                        endpointDescriptor,
                        "nsu=http://test.org/UA/Data/ ;ns=2;i=10305",   // /Data.Static.Array.Int32Value
                        UAIndexRangeList.OneDimension(2, 4)));
            }
            catch (UAException uaException)
            {
                Console.WriteLine("*** Failure: {0}", uaException.GetBaseException().Message);
                return;
            }

            // Cast to typed array
            var arrayValue = (Int32[]) value;

            // Display results
            for (int i = 0; i < 3; i++)
                Console.WriteLine("arrayValue[{0}]: {1}", i, arrayValue[i]);


            // Example output:
            //arrayValue[0]: 180410224
            //arrayValue[1]: 1919239969
            //arrayValue[2]: 1700185172
        }
    }
}

// This example shows how to subscribe to range of values from an array.

using System;
using OpcLabs.EasyOpc.UA;
using OpcLabs.EasyOpc.UA.OperationModel;

namespace UADocExamples._UAIndexRangeList
{
    partial class Usage
    {
        public static void Subscribe()
        {
            UAEndpointDescriptor endpointDescriptor =
                "opc.tcp://opcua.demo-this.com:51210/UA/SampleServer";
            // or "http://opcua.demo-this.com:51211/UA/SampleServer" (currently not supported)
            // or "https://opcua.demo-this.com:51212/UA/SampleServer/"

            // Instantiate the client object
            var client = new EasyUAClient();

            Console.WriteLine("Subscribing to range...");
            var attributeArguments = new UAAttributeArguments(endpointDescriptor, "nsu=http://test.org/UA/Data/ ;i=10933")
                {
                    IndexRangeList = UAIndexRangeList.OneDimension(2, 4)
                };
            var monitoredItemArguments = new UAMonitoredItemArguments(attributeArguments, monitoringParameters:1000);
            // The callback is a lambda expression the displays the value
            client.SubscribeMonitoredItem(monitoredItemArguments,
                (sender, eventArgs) =>
                {
                    if (eventArgs.Succeeded)
                    {
                        var arrayValue = eventArgs.AttributeData.Value as Int32[];
                        if (!(arrayValue is null))
                            Console.WriteLine($"Value: {{{String.Join(",", arrayValue)}}}");
                    }
                    else
                        Console.WriteLine($"*** Failure: {eventArgs.ErrorMessageBrief}");
                });

            Console.WriteLine("Processing data change events for 10 seconds...");
            System.Threading.Thread.Sleep(10 * 1000);

            Console.WriteLine("Unsubscribing...");
            client.UnsubscribeAllMonitoredItems();

            Console.WriteLine("Waiting for 2 seconds...");
            System.Threading.Thread.Sleep(2 * 1000);
        }
    }
}