using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Kreta.BusinessLogic.Classes.ComboBox;
using Kreta.Core;

namespace Kreta.BusinessLogic.Utils
{
    internal class LogicUtil
    {
        internal static IDictionary<string, string> CreateDropdownContent(DataSet ds, string key, string value, string baseItem = null, bool sort = true)
        {
            //Alapból mindenhol kell hogy legyen benne érték
            //
            IDictionary<string, string> result = new Dictionary<string, string>();
            if (!string.IsNullOrWhiteSpace(baseItem))
                result.Add("", baseItem);
            //else
            //    result.Add("", StringResourcesUtil.GetString(364));//Kérem válasszon...

            if (ds.Tables.Count < 1)
                return result;
            var dt = ds.Tables[0];
            var items = dt.AsEnumerable().ToDictionary(row => row.Field<int>(key).ToString(), row => row.Field<string>(value));
            if (sort)
            {
                foreach (var item in items.OrderBy(a => a.Value))
                {
                    result.Add(item);
                }
            }
            else
            {
                foreach (var item in items)
                {
                    result.Add(item);
                }
            }

            return result;
        }

        internal static IDictionary<string, string> CreateGroupedDropdownContent(DataSet ds, string key, string value,
            string group, IList<string> groupIds, string baseItem = null, bool groupIsEnum = false, bool noorder = false)
        {
            IDictionary<string, string> result = new Dictionary<string, string>();
            if (!string.IsNullOrWhiteSpace(baseItem))
            { result.Add("", baseItem); }
            //else { result.Add("", StringResourcesUtil.GetString(364)); } /*Kérem válasszon...*/
            if (ds.Tables.Count < 1)
            { return result; }
            var dt = ds.Tables[0];

            if (groupIsEnum)
            {
                if (noorder == false)
                {
                    foreach (var item in dt.AsEnumerable().OrderBy(a => a.Field<int>(group)))
                    {
                        var groupId = "SDAGID" + item.Field<int>(group);
                        if (groupIds.All(a => a != groupId))
                        {
                            groupIds.Add(groupId);
                            result.Add(groupId, item.Field<string>(group + "_DNAME"));
                        }
                        result.Add(item.Field<int>(key).ToString(), item.Field<string>(value));
                    }
                }
                else
                {
                    foreach (var item in dt.AsEnumerable())
                    {
                        var groupId = "SDAGID" + item.Field<int>(group);
                        if (groupIds.All(a => a != groupId))
                        {
                            groupIds.Add(groupId);
                            result.Add(groupId, item.Field<string>(group + "_DNAME"));
                        }
                        result.Add(item.Field<int>(key).ToString(), item.Field<string>(value));
                    }

                }
            }
            else
            {
                if (noorder == false)
                {
                    foreach (var item in dt.AsEnumerable().OrderBy(a => a.Field<string>(group)))
                    {
                        var groupId = "SDAGID" + item.Field<string>(group);
                        if (groupIds.All(a => a != groupId))
                        {
                            groupIds.Add(groupId);
                            result.Add(groupId, item.Field<string>(group));
                        }
                        result.Add(item.Field<int>(key).ToString(), item.Field<string>(value));
                    }
                }
                else
                {
                    foreach (var item in dt.AsEnumerable())
                    {
                        var groupId = "SDAGID" + item.Field<string>(group);
                        if (groupIds.All(a => a != groupId))
                        {
                            groupIds.Add(groupId);
                            result.Add(groupId, item.Field<string>(group));
                        }
                        result.Add(item.Field<int>(key).ToString(), item.Field<string>(value));
                    }
                }
            }
            return result;
        }

        /// <summary>
        /// MVC-s csoportosítható select listát állít elő
        /// </summary>
        /// <param name="ds"></param>
        /// <param name="keyColumn"></param>
        /// <param name="valueColumn">ha null, akkor a <paramref name="valueFormat"/> paraméterből veszi a value formátumát</param>
        /// <param name="groupNamesColumn"></param>
        /// <param name="groupOrderColumn"></param>
        /// <param name="valueFormat">az item-ek megjelnési formátumát definiálja:
        ///     pl.: "{Nev} ({OktatasiAzonosito})" ahol a Nev és OktatasiAzonosito a <paramref name="ds"/>-ben az oszlop neve</param>
        /// <returns></returns>
        internal static List<ComboBoxListItem> CreateMvcGroupedSelectListItem(DataSet ds, string keyColumn, string valueColumn, string groupNamesColumn, string groupOrderColumn = null, string valueFormat = null)
        {
            MatchCollection matchesInFormat = null;
            if (!string.IsNullOrWhiteSpace(valueFormat))
            {
                matchesInFormat = Regex.Matches(valueFormat, Constants.RegularExpressions.OszlopNevHelyettesito);
            }
            DataTable dt = ds.Tables.Count > 0 ? ds.Tables[0] : null;
            if (dt == null)
            {
                return new List<ComboBoxListItem>();
            }
            EnumerableRowCollection<DataRow> dataRowList = dt.AsEnumerable();
            if (!string.IsNullOrWhiteSpace(groupOrderColumn))
            {
                dataRowList = dataRowList.OrderBy(x => x.Field<int>(groupOrderColumn));
            }
            var groups = dataRowList
                .GroupBy(x => x.Field<string>(groupNamesColumn))
                .Select(group => new KeyValuePair<string, ComboListGroup>(group.Key, new ComboListGroup { Name = group.Key }))
                .ToDictionary(item => item.Key, item => item.Value);

            var result = dt.Rows
                .Cast<DataRow>()
                .Select(item => new ComboBoxListItem
                {
                    GroupName = groups[item.Field<string>(groupNamesColumn)].Name,
                    Text = valueColumn != null ? item.Field<string>(valueColumn) : GetFilledValueFormat(item, valueFormat, matchesInFormat),
                    Value = item.Field<int>(keyColumn).ToString()
                })
                .ToList();
            return result;
        }

        internal static string GetFilledValueFormat(DataRow item, string valueFormat, MatchCollection matches)
        {
            var sb = new StringBuilder(valueFormat);
            for (int i = 0; i < matches.Count; i++)
            {
                sb = sb.Replace(matches[i].Value, item[matches[i].Value.Trim("{}".ToCharArray())].ToString());
            }
            return sb.ToString();
        }

        internal static List<ExtraDataComboBoxListItem> CreateMvcGroupedExtendedComboBoxListItem(DataSet ds, string keyColumn, string valueColumn, string groupNamesColumn, string groupOrderColumn = null, IEnumerable<string> extraDataParameters = null)
        {
            DataTable dt = ds.Tables.Count > 0 ? ds.Tables[0] : null;
            if (dt == null)
            {
                return new List<ExtraDataComboBoxListItem>();
            }
            EnumerableRowCollection<DataRow> dataRowList = dt.AsEnumerable();
            if (!string.IsNullOrWhiteSpace(groupOrderColumn))
            {
                dataRowList = dataRowList.OrderBy(x => x.Field<int>(groupOrderColumn));
            }
            var groups = dataRowList
                .GroupBy(x => x.Field<string>(groupNamesColumn))
                .Select(group => new KeyValuePair<string, ComboListGroup>(group.Key, new ComboListGroup { Name = group.Key }))
                .ToDictionary(item => item.Key, item => item.Value);

            var result = dt.Rows
                .Cast<DataRow>()
                .Select(item => new ExtraDataComboBoxListItem
                {
                    GroupName = groups[item.Field<string>(groupNamesColumn)].Name,
                    Text = item.Field<string>(valueColumn),
                    Value = item.Field<int>(keyColumn).ToString(),
                    Data = extraDataParameters.ToDictionary(extraParameterName => extraParameterName, extraParameterName => item[extraParameterName].ToString())
                })
                .ToList();
            return result;
        }
    }
}