using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using ORiN2.interop.CAO;
using System.Runtime.InteropServices;

namespace Camera
{
    public partial class Form1 : Form
    {
        private CaoEngine caoEng;
        private CaoWorkspaces caoWss;
        private CaoWorkspace caoWs;

        private CaoController caoCtrl;
        private CaoVariable caoVarCapture;
        private CaoVariable caoVarPause;
        
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            btnDisconnect_Click(sender, e);

            if (caoWs != null)
            {
                Marshal.ReleaseComObject(caoWs);
                caoWs = null;
            }
            if (caoWss != null)
            {
                Marshal.ReleaseComObject(caoWss);
                caoWss = null;
            }
            if (caoEng != null)
            {
                Marshal.ReleaseComObject(caoEng);
                caoEng = null;
            }
        }

        private void btnInit_Click(object sender, EventArgs e)
        {
            //Create CAO Engine
            caoEng = new CaoEngine();
            caoWss = caoEng.Workspaces;
            caoWs = caoWss.Item(0);

            btnInit.Enabled = false;
            btnConnect.Enabled = true;
        }

        private void btnConnect_Click(object sender, EventArgs e)
        {
            try
            {
                // Connect Dummy.Camera Provider
                caoCtrl = caoWs.AddController("Camera", "CaoProv.Dummy.Camera", "", "");

                caoVarCapture = caoCtrl.AddVariable("@Image", "");
                caoVarPause   = caoCtrl.AddVariable("@Pause", "");

                // Enable command buttons
                btnConnect.Enabled = false;
                btnDisconnect.Enabled = true;
                btnCaptureVar.Enabled = true;
                btnCaptureFile.Enabled = true;
                btnRead.Enabled = true;
                btnWrite.Enabled = true;
            }
            catch (Exception ex)
            {
                btnDisconnect_Click(sender, e);
                MessageBox.Show(ex.Message);
            }
        }

        private void btnDisconnect_Click(object sender, EventArgs e)
        {
            if (caoVarPause != null)
            {
                Marshal.ReleaseComObject(caoVarPause);
                caoVarPause = null;
            }

            if (caoVarCapture != null)
            {
                Marshal.ReleaseComObject(caoVarCapture);
                caoVarCapture = null;
            }

            // Disconnect Provider
            if (caoCtrl != null)
            {
                CaoControllers ctrls = caoWs.Controllers;
                ctrls.Remove(caoCtrl.Name);

                Marshal.ReleaseComObject(caoCtrl);
                caoCtrl = null;

                Marshal.ReleaseComObject(ctrls);
                ctrls = null;
            }

            // Disable command buttons
            btnConnect.Enabled = true;
            btnDisconnect.Enabled = false;
            btnCaptureVar.Enabled = false;
            btnCaptureFile.Enabled = false;
            btnRead.Enabled = false;
            btnWrite.Enabled = false;
        }

        private void btnCaptureVar_Click(object sender, EventArgs e)
        {
            try
            {
                picCapture.Image = (Image)new ImageConverter()
                    .ConvertFrom(caoVarCapture.Value);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void btnCaptureFile_Click(object sender, EventArgs e)
        {
            // Add File object
            CaoFile caoFl = caoCtrl.AddFile("File", "");

            // Binary -> Image
            ImageConverter imgcon = new ImageConverter();
            picCapture.Image = (Image)imgcon.ConvertFrom(caoFl.Value);

            // Release File object
            CaoFiles caoFls = caoCtrl.Files;
            caoFls.Remove(caoFl.Name);
            Marshal.ReleaseComObject(caoFl);
            Marshal.ReleaseComObject(caoFls);
        }

        private void btnRead_Click(object sender, EventArgs e)
        {
            try
            {
                lblPauseValue.Text = caoVarPause.Value.ToString();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void btnWrite_Click(object sender, EventArgs e)
        {
            try
            {
                caoVarPause.Value = !(bool)caoVarPause.Value;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}