/**
 * An example class showing connection to DataPaq via a socket.
 * 
 * Author Neil Benn
 * Version 1.2
 */
using System;
using System.IO;
using System.Net.Sockets;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

namespace DataPaqRemoteExample
{
    public class ImageForm : Form{
        private Image img;
        
        public ImageForm(Image img)
        {
            this.img = img;
            init();
        }
        
        private void init(){
            PictureBox pb = new PictureBox();
            pb.SizeMode = PictureBoxSizeMode.StretchImage;
            pb.ClientSize = new Size(img.Width/4, img.Height/4);
            pb.Image = img;
            this.Controls.Add(pb);
        }
    }
    
    public class DataPaqRemoteClient
    {
        StreamReader reader = null;
        StreamWriter writer = null;

        public DataPaqRemoteClient()
        {
            TcpClient client = new TcpClient("localhost", 8888);
            NetworkStream stream = client.GetStream();
            reader = new StreamReader(stream);
            writer = new StreamWriter(stream);
            reader.ReadLine();
        }
        
        public String RunScan(String uid)
        {
            Console.WriteLine("Scanning");
            // perform a scan
            writer.Write("SCAN " + uid + " TEXT\r\n");
            writer.Flush();
            Console.WriteLine("SCAN RECEIVED " + reader.ReadLine());

            // read in all the results, appending to the StringBuffer
            StringBuilder scanBuffer = new StringBuilder();
            Boolean scanFirstLine = true;
            while (true) {
                String line = reader.ReadLine();
                if (scanFirstLine) {
                    if (line.StartsWith("ERR")) {
                        throw new Exception("Scanner reported error - "
                            + line + reader.ReadLine());
                    }
                    scanFirstLine = false;
                }
                if (line.Equals("OK")) {
                    break;
                }
                scanBuffer.Append(line).Append("\r\n");
            }
            return scanBuffer.ToString();
        }
        
        public Image GetLastScanImage(int scanPos){
        // get the image of the last scan
        Console.WriteLine("Getting last scanned image");
        writer.Write("LAST_IMAGE 0\r\n");
        writer.Flush();

        Console.WriteLine("reading image in");
        // reading image in
        StringBuilder buffer = new StringBuilder();
        Boolean imageFirstLine = true;
        while (true) {
            String line = reader.ReadLine();
            buffer.Append(line).Append("\r\n");
            // the first line may be an error so we check for that
            // and then set first lien to false as the rest of the
            // lines will not be in error
            if (imageFirstLine) {
                imageFirstLine = false;
                if (line.StartsWith("ERR")) {
                    Console.WriteLine("Error " + line);
                    throw new Exception("failed to read image " + line
                            + " " + reader.ReadLine());
                }
            } else {
                if (line.Length == 0) {
                    break;
                }
            }

        }

        // we have the image we now need to convert the encoded string to bytes
        // and then write the image to a file
        byte[] decoded = Convert.FromBase64String(buffer.ToString());
        MemoryStream ms = new MemoryStream(decoded);
        Image returnImage = Image.FromStream(ms);
        Console.WriteLine("Got Last Scanned Image");
        return returnImage;
    }
        
        public void Close()
        {
            writer.Write("CLOSE\r\n");
            writer.Flush();
            Console.WriteLine("Close Acknowledgement " + reader.ReadLine());
        }
        
        public String GetVersion()
        {
            writer.Write("VERSION\r\n");
            writer.Flush();
            String version = reader.ReadLine();
            Console.WriteLine("Version Acknowledgement " + reader.ReadLine());
            return version;
        }
        
        public String GetStatus()
        {
            writer.Write("STATUS\r\n");
            writer.Flush();
            String status = reader.ReadLine();
            Console.WriteLine("Status Acknowledgement " + reader.ReadLine());
            return status;
        }
        
        public static void Main()
        {
            Console.WriteLine("Starting DataPaq Remote");
            DataPaqRemoteClient dataPaqExample = new DataPaqRemoteClient();
            Console.WriteLine("Version is " + dataPaqExample.GetVersion());
            Console.WriteLine("Status is " + dataPaqExample.GetStatus());
            Console.WriteLine("Scan Result is \r\n" + dataPaqExample.RunScan("1"));
            Image img = dataPaqExample.GetLastScanImage(0);
            dataPaqExample.Close();
            ImageForm imgForm = new ImageForm(img);
            imgForm.AutoSize = true;
            imgForm.Show();
            Application.Run(imgForm);
            Console.ReadKey();
            Console.Write("Finishing DataPaq Remote");
        }
    }
}