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

namespace Elight.Utility.Extensions
{
    public class ExcelReader
    {
        private string fileName = null; //文件名
        private IWorkbook workbook = null;
        private FileStream fs = null;
        private bool disposed;
        public ExcelReader(string fileName)
        {
            this.fileName = fileName;
            disposed = false;
        }
        /// <summary>
        /// 将DataTable数据导入到excel中
        /// </summary>
        /// <param name="data">要导入的数据</param>
        /// <param name="isColumnWritten">DataTable的列名是否要导入</param>
        /// <param name="sheetName">要导入的excel的sheet的名称</param>
        /// <returns>导入数据行数(包含列名那一行)</returns>
        public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
        {
            int i = 0;
            int j = 0;
            int count = 0;
            ISheet sheet = null;

            fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                workbook = new XSSFWorkbook();
            else if (fileName.IndexOf(".xls") > 0) // 2003版本
                workbook = new HSSFWorkbook();
            try
            {
                if (workbook != null)
                {
                    sheet = workbook.CreateSheet(sheetName);
                }
                else
                {
                    return -1;
                }

                if (isColumnWritten == true) //写入DataTable的列名
                {
                    IRow row = sheet.CreateRow(0);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
                    }
                    count = 1;
                }
                else
                {
                    count = 0;
                }

                for (i = 0; i < data.Rows.Count; ++i)
                {
                    IRow row = sheet.CreateRow(count);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
                    }
                    ++count;
                }
                workbook.Write(fs); //写入到excel
                return count;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception: " + ex.Message);
                return -1;
            }
        }
        /// <summary>
        /// 将excel中的数据导入到DataTable中
        /// </summary>
        /// <param name="sheetName">excel工作薄sheet的名称</param>
        /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
        /// <returns>返回的DataTable</returns>
        public DataTable ExcelToDataTable(string sheetName = default, bool isFirstRowColumn = true)
        {
            ISheet sheet = null;
            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                    workbook = new XSSFWorkbook(fs);
                else if (fileName.IndexOf(".xls") > 0) // 2003版本
                    workbook = new HSSFWorkbook(fs);

                if (sheetName != null)
                {
                    sheet = workbook.GetSheet(sheetName);
                    //sheet = workbook.CreateSheet(sheetName);
                    if (sheet == null) //如果没有找到指定的sheetName对应的sheet，则尝试获取第一个sheet
                    {
                        sheet = workbook.GetSheetAt(0);
                    }
                }
                else
                {
                    sheet = workbook.GetSheetAt(0);
                }
                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(0);
                    if (firstRow == null)
                    {
                        return null;
                    }
                    int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数

                    if (isFirstRowColumn)
                    {
                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                        {
                            ICell cell = firstRow.GetCell(i);
                            if (cell != null)
                            {
                                string cellValue = cell.StringCellValue;
                                if (!string.IsNullOrEmpty(cellValue))
                                {
                                    Trace.WriteLine(cellValue);
                                    DataColumn column = new DataColumn(cellValue);
                                    data.Columns.Add(column);
                                }
                            }
                        }
                        startRow = sheet.FirstRowNum + 1;
                    }
                    else
                    {
                        startRow = sheet.FirstRowNum;
                    }

                    //最后一列的标号
                    int rowCount = sheet.LastRowNum;
                    for (int i = startRow; i <= rowCount; ++i)
                    {
                        IRow row = sheet.GetRow(i);
                        if (row == null) continue; //没有数据的行默认是null　　　　　　　

                        DataRow dataRow = data.NewRow();
                        for (int j = row.FirstCellNum; j < cellCount; ++j)
                        {
                            if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
                                dataRow[j] = row.GetCell(j).ToString();
                        }
                        data.Rows.Add(dataRow);
                    }
                }

                return data;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception: " + ex.Message);
                return null;
            }
        }

        public void ExportToExcel(DataTable dt, string fileName)
        {
            IWorkbook workbook;
            string fileExt = Path.GetExtension(fileName).ToLower();
            //XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式
            if (fileExt == ".xlsx")
            {
                workbook = new XSSFWorkbook();
            }
            else if (fileExt == ".xls")
            {
                workbook = new HSSFWorkbook();
            }
            else
            {
                workbook = null;
                return;
            }

            ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(dt.TableName);

            //表头  
            IRow row = sheet.CreateRow(0);
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                ICell cell = row.CreateCell(i);
                cell.SetCellValue(dt.Columns[i].ColumnName);
            }

            //数据  
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                IRow row1 = sheet.CreateRow(i + 1);
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    ICell cell = row1.CreateCell(j);
                    cell.SetCellValue(dt.Rows[i][j].ToString());
                }
            }

            //保存为Excel文件  
            using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
            {
                workbook.Write(fs);
            }
        }



        /// <summary>
        /// EXCEL第一列读取到list
        /// </summary>
        /// <returns></returns>
        public List<string> ExcelToList()
        {
            List<string> list = new List<string>();
            DataTable dt = ExcelToDataTable("Sheet1", true);
            foreach (DataRow item in dt.Rows)
            {
                list.Add(item[0].ToString());
            }
            return list;
        }
        /// <summary>
        /// 读取指定EXCEL列
        /// </summary>
        /// <param name="columnIndex"></param>
        /// <returns></returns>
        public List<string> ExcelToList(int columnIndex)
        {
            List<string> list = new List<string>();
            DataTable dt = ExcelToDataTable("Sheet1", true);
            foreach (DataRow item in dt.Rows)
            {
                list.Add(item[columnIndex].ToString());
            }
            return list;
        }
        public List<string> ExcelToList(string columnName)
        {
            List<string> list = new List<string>();
            DataTable dt = ExcelToDataTable("Sheet1", true);
            foreach (DataRow item in dt.Rows)
            {
                list.Add(item[columnName].ToString());
            }
            return list;
        }
        /// <summary>
        /// list转datatable
        /// </summary>
        /// <param name="collection"></param>
        /// <returns></returns>
        public DataTable ToDataTable(List<string> collection)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("ID");
            foreach (var item in collection)
            {
                DataRow dr = dt.NewRow();
                dr[0] = item.ToString();
                dt.Rows.Add(dr);
            }
            return dt;
        }

        public int ListToExcel(List<string> collection)
        {
            DataTable dt = ToDataTable(collection);
            return DataTableToExcel(dt, "Sheet1", true);
        }
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    if (fs != null)
                        fs.Close();
                }
                fs = null;
                disposed = true;
            }
        }
    }
}