using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;
using System.Linq;
using System.Reflection;
using System.Web;
using MESClassLibrary.BLL.Log;
using MESWebSite.CommonClass;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

namespace MESWebSite.Tool
{
    public class ExcelTool
    {

        /// <summary>
        /// 导出Excel
        /// </summary>
        /// <typeparam name="T">导出的数据集合类型</typeparam>
        /// <param name="data">导出的数据集合</param>
        /// <param name="type">导出的Excel实体类型</param>
        /// <returns></returns>
        public XSSFWorkbook Export<T>(List<T> data, Type type) where T : class
        {
            XSSFWorkbook book = new XSSFWorkbook();
            ISheet sheet = book.CreateSheet("Sheet1");

            IRow hrow = sheet.CreateRow(0);
            PropertyInfo[] prop = type.GetProperties();
            // 通过反射写入表头
            WriteHeader(hrow, prop);
            // 通国反射写入内容
            WriteContent(sheet, data, prop);

            return book;
        }

        public void WriteHeader(IRow row, PropertyInfo[] header)
        {
            for (int i = 0; i < header.Length; i++)
            {
                ICell cell = row.CreateCell(i);
                var col = header[i];
                ExportHeaderAttribute attr = col.GetCustomAttribute<ExportHeaderAttribute>();
                if (attr == null)
                {
                    cell.SetCellValue(col.Name);
                }
                else
                {
                    cell.SetCellValue(attr.HeaderName);
                }
            }
        }

        public void WriteContent<T>(ISheet sheet, List<T> data, PropertyInfo[] header)
        {
            for (int i = 0; i < data.Count; i++)
            {
                IRow row = sheet.CreateRow(i + 1);
                for (int j = 0; j < header.Length; j++)
                {
                    ICell cell = row.CreateCell(j);
                    T o = data[i];
                    var prop = o.GetType().GetProperty(header[j].Name);
                    if (prop != null)
                    {
                        cell.SetCellValue(prop.GetValue(o).ToString());
                    }
                }
            }
        }

        public static DataTable GetExcelTableByOleDB(string strExcelPath, string tableName)
        {
            OleDbConnection objConn = null;
            try
            {
                DataTable dtExcel = new DataTable();
                //数据表
                DataSet ds = new DataSet();
                //获取文件扩展名
                string strExtension = System.IO.Path.GetExtension(strExcelPath);
                string strFileName = System.IO.Path.GetFileName(strExcelPath);
                //Excel的连接

                switch (strExtension)
                {
                    case ".xls":
                        objConn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + strExcelPath + ";" + "Extended Properties=\"Excel 8.0;HDR=NO;IMEX=1;\"");
                        break;
                    case ".xlsx":
                        objConn = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + strExcelPath + ";" + "Extended Properties=\"Excel 12.0;HDR=NO;IMEX=1;\"");
                        break;

                    default:
                        objConn = null;
                        break;
                }
                if (objConn == null)
                {
                    return null;
                }
                try
                {
                    objConn.Open();
                }
                catch (Exception ex)
                {

                }

                //获取Excel中所有Sheet表的信息
                //System.Data.DataTable schemaTable = objConn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
                //获取Excel的第一个Sheet表名
                //string tableName = schemaTable.Rows[0][2].ToString().Trim();
                string strSql = "select * from [" + tableName + "$]";
                //获取Excel指定Sheet表中的信息
                OleDbCommand objCmd = new OleDbCommand(strSql, objConn);
                OleDbDataAdapter myData = new OleDbDataAdapter(strSql, objConn);
                myData.Fill(ds, tableName);//填充数据
                objConn.Close();
                //dtExcel即为excel文件中指定表中存储的信息
                dtExcel = ds.Tables[tableName];
                return dtExcel;
            }
            catch (Exception ex)
            {
                if (objConn != null)
                {
                    objConn.Close();
                }
                LogErrBLL.AddInfo(ex.ToString(), MethodBase.GetCurrentMethod());
                return null;
            }
        }
    }
}