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

namespace YLErp.Helpers
{
    public class DataRowReaderHelper
    {
        DataRow _row;

        readonly Dictionary<string, int> _colMap;

        public DataRowReaderHelper(DataTable table)
        {
            var colCount = table.Columns.Count;

            _colMap = new Dictionary<string, int>(colCount, StringComparer.OrdinalIgnoreCase);

            var row1 = table.Rows[0];
            var preCol1 = string.Empty;

            for (var index = 0; index < colCount; index++)
            {
                var col1 = row1[index]?.ToString()?.Trim();
                if (!string.IsNullOrWhiteSpace(col1))
                {
                    preCol1 = col1;
                }
                _colMap[preCol1] = index;
            }
        }
        public bool ExistFieldName(string fieldName)
        {
            return _colMap.ContainsKey(fieldName);
        }
        public int RowIndex { get; private set; }

        /// <summary>
        /// 设置datarow
        /// </summary>
        public void SetDataRow(DataRow row, int rowIndex)
        {
            _row = row;
            RowIndex = rowIndex;
        }


        public string GetString(string fieldName, bool required = false)
        {
            var str = _colMap.TryGetValue(fieldName, out var colIndex) ? _row[colIndex]?.ToString()?.Trim() : null;

            if (required && string.IsNullOrWhiteSpace(str))
            {
                throw new ServiceException($"第{RowIndex}行{fieldName} 必须填写");
            }

            return str;
        }

        public int? GetInt(string fieldName, bool required)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrEmpty(str))
            {
                return null;
            }

            return int.TryParse(str, out var num) ? num : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }

        public double? GetDoubleOrPercent(string fieldName, bool required, bool percent)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrWhiteSpace(str))
            {
                return null;
            }

            if (percent && (percent = str.EndsWith("%")))
            {
                str = str.TrimEnd('%');
            }

            return double.TryParse(str, out var num) ? (percent ? num / 100 : num) : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }
        public decimal? GetDecimalOrPercent(string fieldName, bool required, bool percent)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrWhiteSpace(str))
            {
                return null;
            }

            if (percent && (percent = str.EndsWith("%")))
            {
                str = str.TrimEnd('%');
            }

            return decimal.TryParse(str, out var num) ? (percent ? num / 100 : num) : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }
        public double? GetDouble(string fieldName, bool required = false)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrWhiteSpace(str))
            {
                return null;
            }

            return double.TryParse(str, out var num) ? num : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }
        public decimal? GetDecimal(string fieldName, bool required = false)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrWhiteSpace(str))
            {
                return null;
            }

            return decimal.TryParse(str, out var num) ? num : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }
        //为了兼容模板修改导致的字段名称改变问题
        public double? GetDouble(string fieldName, string fieldName2, bool required = false)
        {
            var str = GetString(fieldName, false) ?? GetString(fieldName2, false);

            if (string.IsNullOrWhiteSpace(str))
            {
                return required ? throw new ServiceException($"第{RowIndex}行{fieldName} 必须填写") : (double?)null;
            }

            return double.TryParse(str, out var num) ? num : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }

        public double? GetPercent(string fieldName, bool required = false)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrWhiteSpace(str))
            {
                return null;
            }

            var percent = str.EndsWith("%");

            if (percent)
            {
                str = str.TrimEnd('%');
            }

            return double.TryParse(str, out var num) ? (percent ? num / 100 : num) : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }

        /// <summary>
        /// 获取日期(不包括时间)
        /// </summary>
        public DateTime? GetDate(string fieldName, bool required = false)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrWhiteSpace(str))
            {
                return null;
            }

            if (str.Length == 8 && Regex.IsMatch(str, @"^\d+$"))
            {
                return DateTime.TryParseExact(str, "yyyyMMdd", CultureInfo.InvariantCulture, DateTimeStyles.None, out var dt2) ? dt2 : throw new ServiceException($"{fieldName} 填写错误:{str}");
            }

            return DateTime.TryParse(str, out var dt) ? dt.Date : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }

        /// <summary>
        /// 
        /// </summary>
        public int? GetInt32(string fieldName, bool required = false)
        {
            var str = GetString(fieldName, required);

            if (!required && string.IsNullOrWhiteSpace(str))
            {
                return null;
            }

            return int.TryParse(str, out var num) ? num : throw new ServiceException($"第{RowIndex}行{fieldName} 填写错误:{str}");
        }
    }
}