using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PEP_Tool
{
    public static class TableCreater
    {        
            static int errCount = 0;

            public static async Task<DataTable> CreateList(DataTable userList, string filterAbteilung = "%", string filterAbteilung2 = "%", string filterAbteilung3 = "%", string Arbeitsmuster = "", string Datum = "", string Search = "", bool searchWithFilter = false, bool isSearch = false)
            {
                errCount++;
                //System.Diagnostics.Debug.WriteLine($"{filterAbteilung}, {filterAbteilung2}, {filterAbteilung3}, {Arbeitsmuster}, {Datum}, {Search}, {isSearch}, {searchWithFilter}");
                try
                {
                userList.DefaultView.RowFilter = "";
                    DataTable list = new DataTable("UserList");
                list = userList;
                                               
                if (Arbeitsmuster.Contains(";"))
                {
                    switch (Arbeitsmuster.Count(t => t == ';'))
                    {
                        case 1:
                            if (list != null) list.DefaultView.RowFilter = $"(Arbeitsmuster like '{Arbeitsmuster.Split(';')[0]}*' OR Arbeitsmuster like '{Arbeitsmuster.Split(';')[1]}*')";
                            break;

                        case 2:
                            if (list != null) list.DefaultView.RowFilter = $"(Arbeitsmuster like '{Arbeitsmuster.Split(';')[0]}*' OR Arbeitsmuster like '{Arbeitsmuster.Split(';')[1]}*' OR Arbeitsmuster like '{Arbeitsmuster.Split(';')[2]}*')";
                            break;

                        case 3:
                            if (list != null) list.DefaultView.RowFilter = $"(Arbeitsmuster like '{Arbeitsmuster.Split(';')[0]}*' OR Arbeitsmuster like '{Arbeitsmuster.Split(';')[1]}*' OR Arbeitsmuster like '{Arbeitsmuster.Split(';')[2]}*' OR Arbeitsmuster like '{Arbeitsmuster.Split(';')[3]}*')";
                            break;

                        default:
                            break;
                    }
                }
                else
                {
                    if (list != null)
                        list.DefaultView.RowFilter = Arbeitsmuster != "" ? $"Arbeitsmuster like '{Arbeitsmuster}*'" : list.DefaultView.RowFilter;
                }


                if ((filterAbteilung == "%" || filterAbteilung == "") && (filterAbteilung2 == "%" || filterAbteilung2 == "") && (filterAbteilung3 == "%" || filterAbteilung3 == ""))
                    list = userList;
                else if(list.DefaultView.RowFilter == "")
                    list.DefaultView.RowFilter = $"(Abteilung like '{filterAbteilung}' OR Abteilung like '{filterAbteilung2}' OR Abteilung like '{filterAbteilung3}')";
                else list.DefaultView.RowFilter = list.DefaultView.RowFilter += $" AND (Abteilung like '{filterAbteilung}' OR Abteilung like '{filterAbteilung2}' OR Abteilung like '{filterAbteilung3}')";

                if (list.DefaultView.RowFilter == "")
                    list.DefaultView.RowFilter = Datum != "" ? list.DefaultView.RowFilter = $"Datum = {String.Format(System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat, "#{0}#", DateTime.Parse(Datum))}" : list.DefaultView.RowFilter;
                else list.DefaultView.RowFilter = Datum != "" ? list.DefaultView.RowFilter += $" AND Datum = {String.Format(System.Globalization.CultureInfo.InvariantCulture.DateTimeFormat, "#{0}#", DateTime.Parse(Datum.Replace(" 00:00:00", "")))}" : list.DefaultView.RowFilter;

                if (!searchWithFilter && Search == "" && isSearch) list.DefaultView.RowFilter = "";
                else if ((searchWithFilter && Search == "" && isSearch) || !isSearch) list = list;
                else if (!searchWithFilter && Search != "" && isSearch && list.DefaultView.RowFilter == "")
                    list.DefaultView.RowFilter = $"(Name like '%{Search.ToLower()}%' OR Vorname like '%{Search.ToLower()}%')";
                else if (!searchWithFilter && Search != "" && isSearch && list.DefaultView.RowFilter != "")
                    list.DefaultView.RowFilter = list.DefaultView.RowFilter += $" AND (Name like '%{Search.ToLower()}%' OR Vorname like '%{Search.ToLower()}%')";
                else if (searchWithFilter && Search != "" && isSearch && list.DefaultView.RowFilter == "") list.DefaultView.RowFilter = $"(Name like '%{Search.ToLower()}%' OR Vorname like '%{Search.ToLower()}%')";
                else if (searchWithFilter && Search != "" && isSearch && list.DefaultView.RowFilter != "") list.DefaultView.RowFilter = list.DefaultView.RowFilter += $" AND (Name like '%{Search.ToLower()}%' OR Vorname like '%{Search.ToLower()}%')";

                list.DefaultView.Sort = "Name,Vorname,Abteilung,Datum";


                return list;
                //if (list != null)
                //{
                //    errCount = 0;
                //    return list;
                //}
                //else return new List<TableInfo>();
            }
                catch (Exception ex)
                {
                    if (errCount > 1)
                    {
                        LogFile.WriteLine(ex.ToString());
                        LogFile.WriteLine("Message: " + ex.Message);
                        if (ex.InnerException != null) LogFile.WriteLine("InnerException: " + ex.InnerException);
                    }
                    return null;
                    //if (errCount < 5) return await Task.Run(() => CreateList(userList, filterAbteilung, filterAbteilung2, filterAbteilung3, Arbeitsmuster, Datum, Search, searchWithFilter, isSearch));
                    //else return new List<TableInfo>();
                }
            }
        }
    }