using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;

namespace WX.CRM.Common
{
    public class NPOIHelper
    {
        #region 读取EXCEL数据
        static HSSFWorkbook hssfworkbook;
        static IWorkbook xssfworkbook;

        public static void InitializeWorkbook_xls(string filePath)
        {
            using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
            {
                hssfworkbook = new HSSFWorkbook(file);
            }
        }

        public static void InitializeWorkbook_xlsx(string filePath)
        {
            using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
            {
                //xssfworkbook = new XSSFWorkbook(file);
                xssfworkbook = WorkbookFactory.Create(file);
            }
        }

        public static List<List<string>> ConvertToDataTable2(int[] rs)
        {
            ISheet sheet = hssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            List<List<string>> dt = new List<List<string>>();

            int rowindex = 0;
            while (rows.MoveNext())
            {
                IRow row = (HSSFRow)rows.Current;
                if (rs.Contains(rowindex))
                {
                    List<string> dr = row.Cells.Select(cell => cell.ToString().Trim()).ToList();

                    dt.Add(dr);
                }
                rowindex++;
            }
            return dt;
        }

        public static DataTable ConvertToDataTable(int skip = 0)
        {
            ISheet sheet = hssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            DataTable dt = new DataTable();

            int rowindex = 0;
            int cols = 0;
            while (rows.MoveNext())
            {
                if (skip-- > 0)
                {
                    continue;
                }
                IRow row = (HSSFRow)rows.Current;
                if (rowindex == 0)
                {
                    cols = row.LastCellNum;
                    for (int i = 0; i < cols; i++)
                    {
                        ICell cell = row.GetCell(i);

                        if (cell == null)
                        {
                            dt.Columns.Add(Convert.ToChar(('A') + i).ToString());
                        }
                        else
                        {
                            dt.Columns.Add(cell.ToString().Trim() + i.ToString());
                        }
                    }
                }
                else
                {
                    DataRow dr = dt.NewRow();

                    for (int i = 0; i < cols; i++)
                    {
                        ICell cell = row.GetCell(i);

                        if (cell == null)
                        {
                            dr[i] = null;
                        }
                        else
                        {
                            dr[i] = cell.ToString().Trim();
                        }
                    }
                    dt.Rows.Add(dr);
                }
                rowindex++;
            }
            return dt;
        }

        public static DataSet ConvertToDataTable_xlsx(int[] datecol, out int total)
        {
            total = 0;
            DataSet ds = new DataSet();
            ISheet sheet = xssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            DataTable dt = new DataTable();
            int cols = 0;
            bool beginread = false, hasreadhead = false;
            string _tradeDate = "";
            while (rows.MoveNext())
            {
                IRow row = (XSSFRow)rows.Current;
                if (row.GetCell(0).ToString().Trim().IndexOf("交易商代码:") == 0)
                {
                    _tradeDate = row.GetCell(2).ToString().Replace("日期:", "").Trim();

                    beginread = true;
                    continue;
                }
                if (row.GetCell(0).ToString().Trim().IndexOf("合计") == 0)
                {
                    beginread = false;
                    continue;
                }
                if (!beginread)
                {
                    continue;
                }
                if (!hasreadhead)
                {
                    cols = row.LastCellNum;
                    for (int i = 0; i < cols; i++)
                    {
                        ICell cell = row.GetCell(i);

                        if (cell == null)
                        {
                            dt.Columns.Add(Convert.ToChar(('A') + i).ToString());
                        }
                        else
                        {
                            dt.Columns.Add(cell.ToString().Trim());
                        }
                    }
                    dt.Columns.Add("TradeDate");//交易日期
                    hasreadhead = true;
                }
                else
                {
                    if (row.GetCell(0).ToString().Trim() == "成交序号")
                    {
                        continue;
                    }
                    DataRow dr = dt.NewRow();
                    bool isemptyrow = true;
                    for (int i = 0; i < cols; i++)
                    {
                        ICell cell = row.GetCell(i);

                        if (cell == null)
                        {
                            dr[i] = null;
                        }
                        else
                        {
                            #region 检查日期

                            bool isdt = false; DateTime _dt = DateTime.MinValue;
                            if (datecol != null && datecol.Contains(i))
                            {
                                try
                                {
                                    _dt = cell.DateCellValue;
                                    if (_dt != DateTime.MinValue)
                                        isdt = true;
                                }
                                catch
                                {
                                    isdt = false;
                                }
                            }
                            #endregion

                            if (isdt)
                                dr[i] = _dt.ToString();
                            else
                                dr[i] = cell.ToString().Trim();
                            if (isemptyrow && !string.IsNullOrEmpty(dr[i].ToString()))
                            {
                                isemptyrow = false;
                            }
                        }
                    }
                    dr[cols] = _tradeDate;
                    if (!isemptyrow)
                        dt.Rows.Add(dr);
                }
            }
            ds.Tables.Add(dt);
            return ds;
        }

        public static DataTable ConvertToDataTable_xlsx()
        {
            DataTable dt = new DataTable();
            ISheet sheet = xssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            int cols = 0;
            if (rows.MoveNext())
            {
                IRow row = (IRow)rows.Current;
                cols = row.LastCellNum;
                for (int i = 0; i < cols; i++)
                {
                    ICell cell = row.GetCell(i);

                    if (cell == null)
                    {
                        dt.Columns.Add(Convert.ToChar(('A') + i).ToString());
                    }
                    else
                    {
                        dt.Columns.Add(cell.ToString().Trim());
                    }
                }
            }
            while (rows.MoveNext())
            {
                IRow row = (IRow)rows.Current;
                {
                    DataRow dr = dt.NewRow();
                    for (int i = 0; i < cols; i++)
                    {
                        ICell cell = row.GetCell(i);

                        if (cell == null)
                        {
                            dr[i] = null;
                        }
                        else
                        {
                            dr[i] = cell.ToString().Trim();
                        }
                    }
                    dt.Rows.Add(dr);
                }
            }
            return dt;
        }

        /// <summary>
        /// 转让盈亏明细导入
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns></returns>
        public static DataTable ImportExcelX(string filePath)
        {
            IWorkbook workbook = null;
            using (FileStream file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
            {
                workbook = WorkbookFactory.Create(filePath);
            }

            ISheet sheet = workbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            DataTable dt = new DataTable();

            int cols = 0, colindex = 0;
            int rowcount = 0;
            while (rows.MoveNext())
            {
                rowcount++;
                IRow row = (IRow)rows.Current;
                cols = row.LastCellNum;
                for (; colindex < cols; colindex++)
                {
                    dt.Columns.Add(Convert.ToChar(('A') + colindex).ToString());
                }

                DataRow dr = dt.NewRow();

                for (int i = 0; i < cols; i++)
                {
                    ICell cell = row.GetCell(i);

                    if (cell == null)
                    {
                        dr[i] = null;
                    }
                    else
                    {
                        dr[i] = cell.ToString().Trim();
                    }
                }
                dt.Rows.Add(dr);
            }
            return dt;
        }
        #endregion
    }
}