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.ManagedCAO;

namespace IoTDSProviderSample
{
    public partial class FrmMain : Form
    {
        private class ListItem
        {
            public string Name { get { return Variable.Name; } }
            public CCaoVariable Variable { get; private set; }

            public ListItem(CCaoVariable variable)
            {
                Variable = variable;
            }
        }

        private CCaoEngine _engine;
        private CCaoController _controller = null;
        private readonly BindingList<ListItem> _dataSource = new BindingList<ListItem>();

        private bool Connected { get { return _controller != null; } }

        public FrmMain()
        {
            InitializeComponent();
            _engine = new CCaoEngine();

            lstVariables.DisplayMember = "Name";
            lstVariables.ValueMember = "Variable";
            lstVariables.DataSource = _dataSource;

            UpdateControllerStatus();
        }


        private void UpdateControllerStatus()
        {
            txtControllerName.Enabled = !Connected;
            txtServer.Enabled = !Connected;
            nudTimeout.Enabled = !Connected;
            btnAddController.Text = Connected ? "Remove controller" : "AddController";

            grpVariables.Enabled = Connected;

            pnlVariableProperties.Enabled = Connected && lstVariables.SelectedValue != null;
        }

        private void HandleException(Exception ex)
        {
            MessageBox.Show(this, ex.ToString(), Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        private CCaoVariable SelectedVariable { get { return lstVariables.SelectedValue as CCaoVariable; } }

        private void btnAddController_Click(object sender, EventArgs e)
        {
            try
            {
                if (Connected)
                {
                    _engine.Workspaces[0].Controllers.Remove(_controller.Index);
                    _controller = null;
                    _dataSource.Clear();
                }
                else
                {
                    if (string.IsNullOrEmpty(txtControllerName.Text))
                    {
                        throw new ArgumentException("Controller name is required.");
                    }

                    List<string> options = new List<string>();
                    if (!string.IsNullOrEmpty(txtServer.Text))
                    {
                        options.Add(string.Format("Server={0}", txtServer.Text));
                    }
                    options.Add(string.Format("Timeout={0}", nudTimeout.Value));

                    string option = string.Join(",", options);

                    _controller = _engine.Workspaces[0].AddController(
                        txtControllerName.Text,
                        "CaoProv.DENSO.IoTDS",
                        null,
                        option);
                }
            }
            catch (Exception ex)
            {
                HandleException(ex);
            }
            UpdateControllerStatus();
        }

        private void FrmMain_FormClosed(object sender, FormClosedEventArgs e)
        {
            if (_engine != null)
            {
                _engine.Dispose();
                _engine = null;
            }
        }

        private void lstVariables_SelectedIndexChanged(object sender, EventArgs e)
        {
            UpdateControllerStatus();
        }

        private void btnGetValue_Click(object sender, EventArgs e)
        {
            try
            {
                var variable = lstVariables.SelectedValue as CCaoVariable;
                if (variable == null)
                {
                    return;
                }
                ctlValueValue.Value = variable.Value;
            }
            catch (Exception ex)
            {
                HandleException(ex);
            }
        }

        private void btnPutValue_Click(object sender, EventArgs e)
        {
            try
            {
                var variable = lstVariables.SelectedValue as CCaoVariable;
                if (variable == null)
                {
                    return;
                }
                variable.Value = ctlValueValue.Value;
            }
            catch (Exception ex)
            {
                HandleException(ex);
            }
        }

        private void btnAddVariable_Click(object sender, EventArgs e)
        {
            try
            {
                if (_controller == null)
                {
                    return;
                }
                var variable = _controller.AddVariable(txtVariableName.Text, null);
                _dataSource.Add(new ListItem(variable));
            }
            catch (Exception ex)
            {
                HandleException(ex);
            }
            UpdateControllerStatus();
        }
    }
}