using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Diagnostics;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Office.Interop.Excel;   // zusätzlich ist der Projektverweis auf COM -> Microsoft Excel xx-Objectlibrary


namespace Test_ExcelReadColumn
{
    public partial class Form1 : Form
    {
        #region Version und Copyright
        // Version und Copyright
        string programName = Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase); //Den Programmnamen auslesen
        string programVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString();
        static object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyCopyrightAttribute), false);
        string copyright = ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
        string icon = System.Windows.Forms.Application.StartupPath + "\\Info.bmp";
        //Assembly Datum und Zeit
        static DateTime value = AssemblyDateTime();
        string date = value.ToShortDateString();
        string time = value.ToLongTimeString();
        private static DateTime AssemblyDateTime()
        {
            var version = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            var buildDateTime = new DateTime(2000, 1, 1).Add(new TimeSpan(TimeSpan.TicksPerDay * version.Build + TimeSpan.TicksPerSecond * 2 * version.Revision));
            //Tage seit dem 1. Januar 2000 und Sekunden seit Mitternacht, (multiplizier mit 2 ergibt das Original)
            return buildDateTime;
        }
        #endregion

        #region Programm-Info
        /// <summary>
        /// Contains the name of the program file
        /// </summary>
        public static string ProgramName { set; get; }

        /// <summary>
        /// Contains the version of the program file
        /// </summary>
        public static string ProgramVersion { set; get; }

        /// <summary>
        /// Contains the copyright notice
        /// </summary>
        public static string Copyright { set; get; }

        private void SetProgramInfo()
        {
            //Name, Version und Copyright setzen
            ProgramName = programName;
            ProgramVersion = programVersion;
            Copyright = copyright;
        }
        #endregion

        const string colItemNumber = "ItemNumber";
        const string colStatus = "Status";

        //Dateiname
        private string FileName { set; get; }

        //oExcelApp benötigt den kompletten Namensraum, da andernfalls der Compiler den Unterschied zwischen 
        //"Microsoft.Office.Interop.Excel.Application" und "System.Windows.Forms.Application" nicht erkennen kann
        private Microsoft.Office.Interop.Excel.Application oExcelApp = new Microsoft.Office.Interop.Excel.Application();
        private Workbook oWorkbook = null;
        private Worksheet oWorksheet = null;


        public Form1()
        {
            SetProgramInfo(); //Name, Version und Copyright setzen
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.MaximumSize = new Size(808, Screen.PrimaryScreen.Bounds.Height - 30); //Um 30 kleiner, weil sonst der untere Rand hinter der Start-Leiste verschwindet
        }

        private void buttonReadSapColumn_Click(object sender, EventArgs e)
        {
            //Datei öffnen
            string fileName = ReadFileName("Browse SAP Excel File");

            if (!String.IsNullOrEmpty(fileName))
            {
                buttonReadSapColumn.Enabled = false;

                int rangeSAPcolumns = 0;
                List<string> columnObject = new List<string>();
                List<string> columnVStat = new List<string>();

                var colObject = new ColumnValues(fileName);

                WriteColumnToDataGrid(colObject.ReadValues("Objekt"), colObject.ReadValues("Objekt").Count, 0, true);
                rangeSAPcolumns = colObject.ReadValues("Objekt").Count;
                WriteColumnToDataGrid(colObject.ReadValues("VStat"), rangeSAPcolumns, 1, true);
                TranslateColValue(rangeSAPcolumns);
                colObject.CloseExcel();

                buttonReadReuseColumns.Enabled = true;
            }
        }

        private void buttonReadReuseColumns_Click(object sender, EventArgs e)
        {
            //Datei öffnen
            FileName = ReadFileName("Browse Reuse Excel File");

            if (!String.IsNullOrEmpty(FileName))
            {
                buttonReadReuseColumns.Enabled = false;

                int rangeReuseColumns = 0;
                List<string> columnItem = new List<string>();
                List<string> columnOldStatus = new List<string>();
                List<string> columnNewStatus = new List<string>();

                var colItem = new ColumnValues(FileName);

                WriteColumnToDataGrid(colItem.ReadValues("ItemNumber"), colItem.ReadValues("ItemNumber").Count, 0, false);
                rangeReuseColumns = colItem.ReadValues("ItemNumber").Count;
                WriteColumnToDataGrid(colItem.ReadValues("Status"), rangeReuseColumns, 1, false);
                MatchValues();
                //colItem.CloseExcel();

                buttonSaveChanges.Enabled = true;
            }
        }

        private void buttonSaveChanges_Click(object sender, EventArgs e)
        {
            int range = dataGridViewExcelReuse.Rows.Count;
            List<string> status = new List<string>();

            for (int i = 1; i < range; i++)
            {
                if (dataGridViewExcelReuse.Rows[i].Cells[3].Value != null && (bool)dataGridViewExcelReuse.Rows[i].Cells[3].Value == true)
                {
                    status.Add(dataGridViewExcelReuse.Rows[i].Cells[2].Value.ToString());
                }
                else
                {
                    status.Add("");
                }
            }

            var colValues = new ColumnValues(FileName);

            colValues.SaveChanges(status);

            //if (oWorkbook != null)
            //{
            //    oWorkbook.Close();
            //}

            buttonSaveChanges.Enabled = false;
            buttonReadSapColumn.Enabled = true;
        }

        private string ReadFileName(string title)
        {
            openFileDialogExcel = new OpenFileDialog();
            openFileDialogExcel.Title = title;
            openFileDialogExcel.DefaultExt = "xlsx";
            openFileDialogExcel.Filter = "Excel file (*.xlsx)|*.xlsx|All files (*.*)|*.*";
            openFileDialogExcel.FilterIndex = 1;
            openFileDialogExcel.CheckFileExists = true;
            openFileDialogExcel.CheckPathExists = true;
            openFileDialogExcel.ShowDialog();

            return openFileDialogExcel.FileName;
        }

        private void WriteColumnToDataGrid(List<string> columnObject, int rangeColObject, int columnNumber, bool sap)
        {
            if (sap)
            {
                if (dataGridViewExcelSAP.Rows.Count == 1)
                {
                    for (int j = 1; j < rangeColObject; j++)
                    {
                        dataGridViewExcelSAP.Rows.Add(); //Zeilen einfügen
                    }
                }

                for (int j = 0; j < rangeColObject; j++)
                {
                    dataGridViewExcelSAP.Rows[j].Cells[columnNumber].Value = columnObject[j];
                }
            }
            else
            {
                if (dataGridViewExcelReuse.Rows.Count == 1)
                {
                    for (int j = 1; j < rangeColObject; j++)
                    {
                        dataGridViewExcelReuse.Rows.Add(); //Zeilen einfügen
                    }
                }

                for (int j = 0; j < rangeColObject; j++)
                {
                    dataGridViewExcelReuse.Rows[j].Cells[columnNumber].Value = columnObject[j];
                }
            }
        }

        private void TranslateColValue(int rangeSAPcolumns)
        {
            string temp = "";

            for (int i = 0; i < rangeSAPcolumns; i++)
            {
                temp = dataGridViewExcelSAP.Rows[i].Cells[1].Value.ToString();
                temp = temp.Remove(temp.LastIndexOf(")"));
                temp = temp.Remove(0, temp.IndexOf("(") + 1);
                dataGridViewExcelSAP.Rows[i].Cells[2].Value = temp;
            }
        }

        private void MatchValues()
        {
            string value = "";
            int range = dataGridViewExcelReuse.Rows.Count;

            //for (int i = 0; i < oRangeReuse.Rows.Count; i++)
            for (int i = 0; i < range; i++)
            {
                //Zeilenweise die Spalte 1 einlesen. Wenn der Wert nicht '<Kein Wert>' ist, dann in der SAP Liste Spalte 1 durchsuchen ob der Wert existiert. Existiert der Wert, dann den Wert aus Spalte 3 in die Reuse Liste Spalte 3 schreiben und Spalte 4 setzen.
                if (dataGridViewExcelReuse.Rows[i].Cells[0].Value != null)
                {
                    if (dataGridViewExcelReuse.Rows[i].Cells[0].Value.ToString() != "<Kein Wert>")
                    {
                        value = DetermineValue(dataGridViewExcelReuse.Rows[i].Cells[0].Value.ToString());

                        if (dataGridViewExcelReuse.Rows[i].Cells[1].Value.ToString() != value)
                        {
                            if (value != "")
                            {
                                dataGridViewExcelReuse.Rows[i].Cells[2].Value = value;
                                dataGridViewExcelReuse.Rows[i].Cells[3].Value = true;
                            }
                            else
                            {
                                dataGridViewExcelReuse.Rows[i].Cells[2].Value = dataGridViewExcelReuse.Rows[i].Cells[1].Value;
                            }
                            
                        }
                        else
                        {
                            dataGridViewExcelReuse.Rows[i].Cells[2].Value = dataGridViewExcelReuse.Rows[i].Cells[1].Value;
                        }
                    }
                }
            }
        }

        private string DetermineValue(string value)
        {
            string newValue = "";
            string objectSAP = "";

            for (int j = 0; j < dataGridViewExcelSAP.Rows.Count; j++)
            {
                objectSAP = dataGridViewExcelSAP.Rows[j].Cells[0].Value.ToString();
                if (objectSAP != null)
                {
                    if (objectSAP == value)
                    {
                        newValue = dataGridViewExcelSAP.Rows[j].Cells[2].Value.ToString();
                        
                        break;
                    }
                }
            }

            return newValue;
        }
    }
}