using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ORiN2.interop.CAO;
using System.Runtime.InteropServices;

namespace CaoProvKEYENCEFSN40NUEP1.Sample
{
    public partial class Form1 : Form
    {
        // Cao objects
        private CaoEngine       caoEng  = null;
        private CaoWorkspace    caoWs   = null;
        private CaoController   caoCtrl = null;
        private CaoExtension    caoExt  = null;
        private CaoVariable     caoVal  = null;

        // Define static number
        private const int MIN_PUTENABLEDINDEX = 14;
        private const int MAX_PUTENABLEDINDEX = 90;
        
        // Constructor
        public Form1()
        {
            InitializeComponent();

            // Initialize Cao objects
            caoEng = new CaoEngine();
            caoWs = caoEng.AddWorkspace("Sample");
        }

        private void B_CONNECT_Click(object sender, EventArgs e)
        {
            // Remove objects
            if(caoCtrl != null){
                if(caoExt != null){
                    if(caoVal != null){
                        caoExt.Variables.Remove(caoVal.Index);
                        Marshal.ReleaseComObject(caoVal);
                        caoVal = null;
                    }
                    caoCtrl.Extensions.Remove(caoExt.Index);
                    Marshal.ReleaseComObject(caoExt);
                    caoExt = null;
                }
                caoWs.Controllers.Remove(caoCtrl.Index);
                Marshal.ReleaseComObject(caoCtrl);
                caoCtrl = null;
            }

            // Connect
            try{
                caoCtrl = caoWs.AddController("Sample", "CaoProv.KEYENCE.FSN40NUEP1", "", "conn=eth:" + T_IPADRESS.Text);
                caoExt  = caoCtrl.AddExtension("CH" + T_CHANNEL.Text);
            }
            catch (Exception ex){
                MessageBox.Show(ex.ToString(), "Error occured", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            // Form control
            GROUP.Enabled = true;

            object[] ValNames;
            try{
                ValNames = caoExt.VariableNames;
            }
            catch (Exception ex){
                MessageBox.Show(ex.ToString(), "Error occured", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            for (int i = 0; i < ValNames.Length; i++){
                C_VARIABLE.Items.Add(ValNames[i]);
            }
            C_VARIABLE.SelectedIndex = 0;
        }

        private void C_VARIABLE_SelectedIndexChanged(object sender, EventArgs e)
        {
            // Form control
            if (C_VARIABLE.SelectedIndex >= MIN_PUTENABLEDINDEX && C_VARIABLE.SelectedIndex <= MAX_PUTENABLEDINDEX){
                B_PUT.Enabled       = true;
            }
            else{
                B_PUT.Enabled       = false;
            }
        }

        private void B_SEND_Click(object sender, EventArgs e)
        {
            // Send
            try{
                caoExt.Execute(T_EXECUTE.Text);
            }
            catch (Exception ex){
                MessageBox.Show(ex.ToString(), "Error occured", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
        }

        private void B_GET_Click(object sender, EventArgs e)
        {
            // Remove CaoVariable object
            if (caoVal != null){
                caoExt.Variables.Remove(caoVal.Index);
                Marshal.ReleaseComObject(caoVal);
                caoVal = null;
            }

            // Get
            try{
                caoVal = caoExt.AddVariable(C_VARIABLE.Text);
            }
            catch (Exception ex){
                MessageBox.Show(ex.ToString(), "Error occured", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            try{
                T_VARIABLE.Text = caoVal.Value.ToString();
            }
            catch{
                try{
                    T_VARIABLE.Text = caoVal.Value;
                }
                catch (Exception ex){
                    MessageBox.Show(ex.ToString(), "Error occured", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
            }
        }

        private void B_PUT_Click(object sender, EventArgs e)
        {
            // Remove CaoVariable object
            if (caoVal != null)
            {
                caoExt.Variables.Remove(caoVal.Index);
                Marshal.ReleaseComObject(caoVal);
                caoVal = null;
            }

            // Put
            try{
                caoVal = caoExt.AddVariable(C_VARIABLE.Text);
                if (C_VARIABLE.Text == "@TAGStrings" || C_VARIABLE.Text == "@CTAGStrings"){
                    caoVal.Value = T_VARIABLE.Text;
                }
                else{
                    caoVal.Value = int.Parse(T_VARIABLE.Text);
                }
            }
            catch (Exception ex){
                MessageBox.Show(ex.ToString(), "Error occured", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            // Remove objects
            if (caoCtrl != null)
            {
                if (caoExt != null)
                {
                    if (caoVal != null)
                    {
                        caoExt.Variables.Remove(caoVal.Index);
                        Marshal.ReleaseComObject(caoVal);
                        caoVal = null;
                    }
                    caoCtrl.Extensions.Remove(caoExt.Index);
                    Marshal.ReleaseComObject(caoExt);
                    caoExt = null;
                }
                caoWs.Controllers.Remove(caoCtrl.Index);
                Marshal.ReleaseComObject(caoCtrl);
                caoCtrl = null;
            }
        }
    }
}