using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Globalization;
using System.Media;
using System.Drawing.Imaging;

namespace EXIF
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public class ExifReader
        {
            DateTimeFormatInfo m_dateTimeFormat = new DateTimeFormatInfo();
            private ASCIIEncoding ascii;
            private Image image;
            int[] MyPropertyIdList;

            public ExifReader(String file)
            {
                try
                {
                    image = Image.FromFile(file);
                    MyPropertyIdList = image.PropertyIdList;  //Array
                    ascii = new ASCIIEncoding(); //System.Text
                }
                catch (Exception e)
                {
                    Console.WriteLine("Reading Image Error: " + e);
                }
            }

            //272 Model
            public String GetModel()
            {
                try
                {
                    PropertyItem propItem = image.GetPropertyItem(272);
                    String decodedString = ascii.GetString(propItem.Value);
                    return decodedString;
                }
                catch (Exception e)
                {
                    if (e.GetType().ToString() != "System.ArgumentNullException")
                    {
                    }
                }
                return "";
            }

            //Same as FStop
            public String GetFNumber()
            {
                try
                {
                    PropertyItem propItem = image.GetPropertyItem(33437);
                    String pv0 = BitConverter.ToInt16(propItem.Value, 0).ToString();
                    if (pv0.Length == 3) pv0 = pv0.Substring(0, 2);
                    if (pv0 != "22" && pv0 != "32" && !pv0.StartsWith("1"))
                        pv0 = pv0.Substring(0, pv0.Length - 1) + "." + pv0.Substring(pv0.Length - 1, 1);
                    pv0 = pv0.Replace(".0", "");
                    return pv0;
                }
                catch (Exception e)
                {
                    if (e.GetType().ToString() != "System.ArgumentNullException")
                    {
                    }
                }
                return "";
            }

            // Same as Shutter Speed
            public String GetExposureTime()
            {
                try
                {
                    PropertyItem propItem = image.GetPropertyItem(33434);
                    String pv0 = BitConverter.ToInt16(propItem.Value, 0).ToString();
                    String pv1 = BitConverter.ToInt16(propItem.Value, 4).ToString();
                    // Turn 10/2500 into 1/250
                    if (pv0.EndsWith("0") && pv1.EndsWith("0"))
                    {
                        pv0 = pv0.Substring(0, pv0.Length - 1);
                        pv1 = pv1.Substring(0, pv1.Length - 1);
                    }
                    //Turn 8/1 into 8
                    if (pv1 == "1") return pv0;
                    return pv0 + "/" + pv1;
                }
                catch (Exception e)
                {
                    if (e.GetType().ToString() != "System.ArgumentNullException")
                    {
                    }
                }
                return "";


            }

            //34855 ISO
            public String GetISO()
            {
                try
                {
                    PropertyItem propItem = image.GetPropertyItem(34855);
                    String pv0 = BitConverter.ToInt16(propItem.Value, 0).ToString();
                    return pv0;
                }
                catch (Exception e)
                {
                    if (e.GetType().ToString() != "System.ArgumentNullException")
                    {
                    }
                }
                return "";
            }

            //37386 FocalLength
            public String GetFocalLength()
            {
                try
                {
                    PropertyItem propItem = image.GetPropertyItem(37386);
                    String pv0 = BitConverter.ToInt16(propItem.Value, 0).ToString();
                    double a = Math.Floor(Convert.ToDouble(pv0) / 10);
                    pv0 = a.ToString();
                    return pv0;
                }
                catch (Exception e)
                {
                    if (e.GetType().ToString() != "System.ArgumentNullException")
                    {
                    }
                }
                return "";
            }

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();
            dlg.Title = "Open Image";
            dlg.Filter = "jpg files (*.jpg)|*.jpg|All files (*.*)|*.*";

            if (dlg.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image = new Bitmap(dlg.OpenFile());
                string foto_adress = dlg.FileName.ToString();
                // get_exif_data
                ExifReader r = new ExifReader(foto_adress);
                label1.Text = "" + r.GetModel();

                string a = "" + r.GetFNumber();
                string[] q = a.Split('F');
                label2.Text = "f/" + q[0].ToString();
                label3.Text = "" + r.GetExposureTime();
                label4.Text = "" + r.GetFocalLength() + " mm";
                label5.Text = "ISO-" + r.GetISO();
            }
            dlg.Dispose();




        }
    }
}