using System;
using Opc.UaFx.Client;

namespace BitAPI.Controllers
{

    /*
        This is a copy of the demo made by Thomas (it's on Blackboard)
        It has some minors changes and is called from the API
    */
    class OPCConnection
    {
        //Class-wide server object for easy accessibility
        OpcClient accessPoint;

        //string serverURL = "opc.tcp://192.168.0.122:4840";  //Physical PLC
        string serverURL = "opc.tcp://127.0.0.1:4840";      //Simulated PLC


        //Main for testing
        public void CallMachine()
        {
            OPCConnection prg = new OPCConnection();

            //The using statement of .NET automatically cleans up and automatically disposes
            //of objects that implements the IDisposable interface.
            using (prg.accessPoint = new OpcClient(prg.serverURL))
            {
                //Connect to server
                prg.ConnectToServer();

                //Keep looping for testing
                while (true)
                {
                    prg.ReadFromServer();
                    prg.WriteToServer();

                    System.Threading.Thread.Sleep(500); //Hang out for half a second (testing)
                }
            }
        }


        // MAPPING OF OPC UA NODES
        // Example: 'ns=6;s=::Program:Cube.Status.Parameter[3].Value'
        // The node destination address can be a little tricky, but can be easily found for each variable through UaExpert.
        // The 'ns=6' indicates that the variable is on NamespaceIndex 6, which all of the Beer Production variables will be.
        // The 's=' following it, indicates that the value to be read is a string type ('i=' would indicate integer etc.),
        // after which the actual path of the variable is defined ('::Program:Cube.Status.Parameter[3]').
        // Note: some values will require specifically targeting the value ('...Status.Parameter[3].Value').
        // Read further: https://documentation.unified-automation.com/uasdkhp/1.0.0/html/_l2_ua_node_ids.html
        // REMEMBER TO READ THE MANUAL CAREFULLY!

        public void ReadFromServer()
        {
            //Read example node values
            var temperature = accessPoint.ReadNode("ns=6;s=::Program:Cube.Status.Parameter[3].Value");
            var movement = accessPoint.ReadNode("ns=6;s=::Program:Cube.Status.Parameter[4].Value");
            var CntrlCmd = accessPoint.ReadNode("ns=6;s=::Program:Cube.Command.CntrlCmd");
            var BatchId = accessPoint.ReadNode("ns=6;s=::Program:Cube.Admin.Parameter[0].ID");

            //Print values to console window
            Console.WriteLine("Batch id bitches:" + BatchId);
            Console.WriteLine("Temp: {0,-5} Movement: {1,-5} Batch ID: {2,-5}", temperature, movement, CntrlCmd);
        }

        public void WriteToServer()
        {
            //Writes a random int between 1-5 to the Cube.Command.CntrlCmd node on the server.
            //This is for testing purposes only, to see if the value changes correctly!
            Random rnd = new Random();

            accessPoint.WriteNode("ns=6;s=::Program:Cube.Command.CntrlCmd", 1);
            System.Threading.Thread.Sleep(10000);
            accessPoint.WriteNode("ns=6;s=::Program:Cube.Command.CmdChangeRequest", true);

        }

        public void ConnectToServer()
        {
            accessPoint.Connect();
        }
        public void DisconnectFromServer()
        {
            accessPoint.Disconnect();
            accessPoint.Dispose(); //Clean up in case it wasn't automatically handled
        }
    }
}