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

        //Spalten Namen
        const string colObject = "Objekt";
        const string colVStatus = "VStat";
        const string colItemNumber = "ItemNumber";
        const string colStatus = "Status";

        int colomnStatus = 0;

        int oRangeSap;
        int oRangeReuse;

        string fileNameReuse = "";

        ////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)
        {
            List<object> columnObject = new List<object>();
            List<object> columnVstat = new List<object>();
            List<object> columnStat = new List<object>();

            labelSaveStatus.Visible = false;
            buttonReadSapColumn.Enabled = false;

            //Datei öffnen
            string fileName = ReadFileName("Browse SAP Excel File");

            var excel = new Excel(fileName);
            columnObject = excel.ReadColumn(colObject);
            columnVstat = excel.ReadColumn(colVStatus);
            columnStat = TranslateColumnValue(excel.RangeColumns, columnVstat);
            oRangeSap = excel.RangeColumns;

            dataGridViewExcelSAP.Rows.Add(excel.RangeColumns - 2); //Feld anlegen

            for (int i = 0; i < excel.RangeColumns - 1; i++)
            {
                dataGridViewExcelSAP.Rows[i].Cells[0].Value = columnObject[i];
                dataGridViewExcelSAP.Rows[i].Cells[1].Value = columnVstat[i];
                dataGridViewExcelSAP.Rows[i].Cells[2].Value = columnStat[i];
            }

            excel.CloseSheet();

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

        private void buttonReadReuseColumns_Click(object sender, EventArgs e)
        {
            List<object> columnItemNumber = new List<object>();
            List<object> columnStatusOld = new List<object>();
            List<object> columnStatusNew = new List<object>();
            List<bool> changeStatus = new List<bool>();

            buttonReadReuseColumns.Enabled = false;

            //Datei öffnen
            fileNameReuse = ReadFileName("Browse Reuse Excel File");

            var excel = new Excel(fileNameReuse);
            columnItemNumber = excel.ReadColumn(colItemNumber);
            columnStatusOld = excel.ReadColumn(colStatus);
            oRangeReuse = excel.RangeColumns;
            columnStatusNew = MatchValues(oRangeReuse, columnItemNumber, columnStatusOld);
            changeStatus = MatchChangeStatus(columnStatusOld, columnStatusNew);
            colomnStatus = excel.ColumnNumber(colStatus);

            dataGridViewExcelReuse.Rows.Add(excel.RangeColumns - 2); //Feld anlegen

            for (int i = 0; i < excel.RangeColumns - 1; i++)
            {
                dataGridViewExcelReuse.Rows[i].Cells[0].Value = columnItemNumber[i];
                dataGridViewExcelReuse.Rows[i].Cells[1].Value = columnStatusOld[i];
                dataGridViewExcelReuse.Rows[i].Cells[2].Value = columnStatusNew[i];
                dataGridViewExcelReuse.Rows[i].Cells[3].Value = changeStatus[i];
            }

            excel.CloseSheet();

            buttonSaveChanges.Enabled = true;
        }

        private void buttonSaveChanges_Click(object sender, EventArgs e)
        {
            List<object> columnStatusNew = new List<object>();
            List<bool> changeStatus = new List<bool>();

            for (int i = 0; i < oRangeReuse - 1; i++)
            {
                columnStatusNew.Add(dataGridViewExcelReuse.Rows[i].Cells[2].Value);
                changeStatus.Add((bool)dataGridViewExcelReuse.Rows[i].Cells[3].Value);
            }

            var excel = new Excel(fileNameReuse);
            excel.WriteColumn(colStatus, columnStatusNew, changeStatus);
            excel.CloseSheet();

            buttonSaveChanges.Enabled = false;
            buttonReadSapColumn.Enabled = true;
            labelSaveStatus.Visible = true;
            CleanUpView();
        }

        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 List<object> TranslateColumnValue(int rangeColumns, List<object> columnVstat)
        {
            string temp = "";
            List<object> newValues = new List<object>();

            for (int i = 0; i < rangeColumns - 1; i++)
            {
                temp = columnVstat[i].ToString();
                temp = temp.Remove(temp.LastIndexOf(")"));
                temp = temp.Remove(0, temp.IndexOf("(") + 1);
                newValues.Add(temp);
            }

            return newValues;
        }

        private List<object> MatchValues (int range, List<object> columnItemNumber, List<object> columnStatusOld)
        {
            List<object> columnStatusNew = new List<object>();

            string value = "";

            for (int i = 0; i < range - 1; i++)
            {
                //Zeilenweise die 'ItemNumber' 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 'Status' in 'StatusNew' schreiben und 'ChangeStatus' setzen.
                if (columnItemNumber[i] != null)
                {
                    if (columnItemNumber[i].ToString() != "<Kein Wert>")
                    {
                        value = DetermineValue(oRangeSap, columnItemNumber[i].ToString());
                        columnStatusNew.Add(value);
                    }
                    else
                    {
                        columnStatusNew.Add(null);
                    }
                }
                else
                {
                    columnStatusNew.Add(columnItemNumber[i]);
                }
            }

            return columnStatusNew;
        }

        private List<bool> MatchChangeStatus(List<object> columnStatusOld, List<object> columnStatusNew)
        {
            List<bool> changeStatus = new List<bool>();

            int range = columnStatusOld.Count;

            for (int i = 0; i < range; i++)
            {
                if (columnStatusNew[i] == null || columnStatusNew[i].ToString() == "" || columnStatusOld[i].ToString() == columnStatusNew[i].ToString())
                {
                    changeStatus.Add(false);
                }
                else
                {
                    changeStatus.Add(true);
                }
               
            }

            return changeStatus;
        }
        
        private string DetermineValue(int range, string value)
        {
            string newValue = "";

            for (int j = 0; j < range - 1; j++)
            {
                if (dataGridViewExcelSAP.Rows[j].Cells[0].Value != null)
                {
                    if (dataGridViewExcelSAP.Rows[j].Cells[0].Value.ToString() == value)
                    {
                        newValue = dataGridViewExcelSAP.Rows[j].Cells[2].Value.ToString();
                        
                        break;
                    }
                }
            }

            return newValue;
        }

        private void CleanUpView()
        {
            dataGridViewExcelSAP.Rows.Clear();
            dataGridViewExcelReuse.Rows.Clear();
        }
    }
}