using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using Ease.CoreV35.Model;

namespace Payroll.BO
{
    [Serializable]
    public class DataUploadValidation 
    {


        #region Properties

        public DataUploadValidation()
        {
            _errorOrSuccList = new List<UploadErrorOrSuccess>();
        }

        #region Error List For New Regular Data Upload
        private List<UploadErrorOrSuccess> _errorOrSuccList;
        public List<UploadErrorOrSuccess> ErrorOrSuccessList
        {
            get { return _errorOrSuccList; }
            set { _errorOrSuccList = value; }
        }
        #endregion
        #endregion

        #region Functions

        #region Validate Input
        public void ValidateInput(DataUploadColumnDefinition columnDefinitions, DataTable dTable)
        {
            //this.uploadStatus = uploadStatus;
            int index = -1;
//            ExcelColumnNameValidation(columnDefinitions, dTable);
            if (columnDefinitions.ColumnName.Count != dTable.Columns.Count)
                throw new Exception("No of excel column is not like the excel column definition");
            else
            {
                foreach (DataRow row in dTable.Rows)
                {
                    index++;
                    //uploadStatus.Text = string.Format("Validating Fields... {0}/{1}", index, dTable.Rows.Count);
                    //uploadStatus.Refresh();
                    object[] obj = row.ItemArray;
                    for (int i = 0; i < obj.Length; i++)
                    {
                        if (columnDefinitions.IsAllowNull(dTable.Columns[i].ColumnName)==false)
                        {
                            if (!ExcelNullValueValidation(obj[i]))
                            {
                                this.GenerateErrorList(dTable.Columns[i].ColumnName, index, " Value can't be empty/blank.");
                                continue;
                            }
                        }

                        if (ExcelNullValueValidation(obj[i])==true )
                        {
                            if (!ExcelDataTypeValidation(dTable.Columns[i].ColumnName, obj[i].ToString(),columnDefinitions))
                                this.GenerateErrorList(dTable.Columns[i].ColumnName, index, "'" + obj[i].ToString() + "' is not valid " + columnDefinitions.GetColumnDataType(dTable.Columns[i].ColumnName));
                            }
                    }
                }
            }
        }
        #endregion

        #region Generate Error List
        private void GenerateErrorList(string columnName, int counter, string errMsg)
        {
            UploadErrorOrSuccess oItem = new UploadErrorOrSuccess();
            oItem.RowNo = counter + 1;
            oItem.ColumName = columnName;
            oItem.Message ="Row:" +  oItem.RowNo.ToString() + " Column:" + columnName + " " + errMsg;
            _errorOrSuccList.Add(oItem);
        }
        #endregion

        #region Excel Column Name Validation
        public  void ColumnNameValidation(DataUploadColumnDefinition columnDefinitions, DataTable uploadData)
        {
            bool isExist=false;
            foreach (string item in columnDefinitions.ColumnName)
            {
                isExist=false;
                foreach(DataColumn col in uploadData.Columns)
                {
                    if (col.ColumnName.ToUpper().Trim() == item.ToUpper().Trim())
                    {
                        col.ColumnName = item;
                        isExist = true;
                        break;
                    }
                }
                if (isExist==false)
                    GenerateErrorList(item, 1, " column not found in the excel data");

            }
        }
        #endregion

        #region Excel Null Value Validation
        private bool ExcelNullValueValidation(object columnValue)
        {
            if (columnValue == null || columnValue.ToString() == string.Empty) return false;
            else return true;
        }
        #endregion


        #region Excel Column Data Type Validation
        private bool ExcelDataTypeValidation(string columnName, string columnValue, DataUploadColumnDefinition columnDefinitions)
        {
            int index= columnDefinitions.getColumnIndex(columnName);
            bool IsValid = true;
            switch ((EnumColumnDataType)Enum.Parse(typeof(EnumColumnDataType), columnDefinitions.DataType[index]))
            {
                case EnumColumnDataType.Int:
                    {
                        int number = 0;
                        if (!int.TryParse(columnValue, out number))
                            IsValid = false;
                        break;
                    }
                case EnumColumnDataType.String:
                    {
                        //if (columnValue == null || Convert.ToString(columnValue) == string.Empty)
                        //    IsValid = false;
                        break;
                    }
                case EnumColumnDataType.Double:
                    {
                        double number = 0.0;
                        if (!double.TryParse(columnValue, out number))
                            IsValid = false;
                        break;
                    }
                case EnumColumnDataType.Date:
                    {
                        DateTime dt = new DateTime();
                        if (!DateTime.TryParse(columnValue, out dt))
                            IsValid = false;
                        break;
                    }
                case EnumColumnDataType.Boolean:
                    {
                        bool value = false;
                        if (!bool.TryParse(columnValue, out value))
                            IsValid = false;
                        break;
                    }
            }
            return IsValid;
        }
        #endregion 

        #endregion

    }
}