using Aspose.Cells;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Web;


namespace Utils.Datas
{

  /// <summary>
  /// Excel操作帮助类 （引用程序集Aspose.Cells.dll）
  /// </summary>
  public class ExcelHelper
  {
    /// <summary>
    /// 读取指定路径的Excel文件为DataTable
    /// </summary>
    /// <param name="fileName">文件全路径</param>
    /// <param name="firstRow">要开始读取的第一行在Excel中的行索引（默认会以此行各列数据作为DataTable的列名）</param>
    /// <param name="firstColumn">要开始读取的第一列在Excel中的列索引</param>
    /// <param name="invalidEndRowNumber">文件尾部无效行数目（该部分所有行数据将不会被读取）</param>
    /// <returns>返回DataSet</returns>
    public static DataSet ReadExcel(string fileName, int firstRow = 0, int firstColumn = 0, int invalidEndRowNumber = 0)
    {
      DataSet ds = new DataSet();
      try {
        if (string.IsNullOrEmpty(fileName) || !System.IO.File.Exists(fileName)) {
          return null;
        }
        //new Aspose.Cells.License().SetLicense(AsposeHelper.LStream);
        Cells cells;
        Workbook workbook = new Workbook(fileName);
        foreach (Worksheet worksheet in workbook.Worksheets) {
          cells = worksheet.Cells;//取Sheet读取
          if (cells == null) {
            return null;
          }
          try {
            DataTable dt = cells.ExportDataTable(firstRow, firstColumn, cells.MaxDataRow + 1, cells.MaxDataColumn + 1, true);
            dt.TableName = worksheet.Name;//取Sheet的名字作为表名
            if (dt != null && dt.Rows.Count > 0) {
              ds.Tables.Add(dt);
            }
          } catch (Exception e) {
            LogUtil.LogError("读取Excel内容失败：worksheet.Name" + worksheet.Name + "  " + e.Message);
          }
        }

      } catch (Exception ex) {
        LogUtil.LogError("读取Excel内容失败：" + ex.Message);
      }
      return ds;
    }

    /// <summary>
    /// 将DataTable导出指定路径的Excel文件
    /// </summary>
    /// <param name="dt">DataTable</param>
    /// <param name="tableName">Excel文件的表头内容</param>
    /// <param name="path">文件保存的全路径</param>
    public static void ExportExcel(DataTable dt, string headerText, string path)
    {
      Workbook workbook = new Workbook(); //工作簿 
      Worksheet sheet = workbook.Worksheets[0]; //工作表 
      Cells cells = sheet.Cells;//单元格 

      //为标题设置样式     
      Style styleTitle = workbook.Styles[workbook.Styles.Add()];//新增样式 
      styleTitle.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
      styleTitle.Font.Name = "宋体";//文字字体 
      styleTitle.Font.Size = 18;//文字大小 
      styleTitle.Font.IsBold = true;//粗体 

      //样式2 
      Style style2 = workbook.Styles[workbook.Styles.Add()];//新增样式 
      style2.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
      style2.Font.Name = "宋体";//文字字体 
      style2.Font.Size = 14;//文字大小 
      style2.Font.IsBold = true;//粗体 
      style2.IsTextWrapped = true;//单元格内容自动换行 
      style2.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
      style2.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
      style2.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
      style2.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;

      //样式3 
      Style style3 = workbook.Styles[workbook.Styles.Add()];//新增样式 
      style3.HorizontalAlignment = TextAlignmentType.Center;//文字居中 
      style3.Font.Name = "宋体";//文字字体 
      style3.Font.Size = 12;//文字大小 
      style3.Borders[BorderType.LeftBorder].LineStyle = CellBorderType.Thin;
      style3.Borders[BorderType.RightBorder].LineStyle = CellBorderType.Thin;
      style3.Borders[BorderType.TopBorder].LineStyle = CellBorderType.Thin;
      style3.Borders[BorderType.BottomBorder].LineStyle = CellBorderType.Thin;

      int Colnum = dt.Columns.Count;//表格列数 
      int Rownum = dt.Rows.Count;//表格行数 

      //生成行1 标题行    
      cells.Merge(0, 0, 1, Colnum);//合并单元格 
      cells[0, 0].PutValue(headerText);//填写内容 
      cells[0, 0].SetStyle(styleTitle);
      cells.SetRowHeight(0, 38);

      //生成行2 列名行 
      for (int i = 0; i < Colnum; i++) {
        cells[1, i].PutValue(dt.Columns[i].ColumnName);
        cells[1, i].SetStyle(style2);
        cells.SetRowHeight(1, 25);
      }

      //生成数据行 
      for (int i = 0; i < Rownum; i++) {
        for (int k = 0; k < Colnum; k++) {
          cells[2 + i, k].PutValue(dt.Rows[i][k].ToString());
          cells[2 + i, k].SetStyle(style3);
        }
        cells.SetRowHeight(2 + i, 24);
      }

      workbook.Save(path);
    }
  }
}