using NPOI.HPSF;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using ProjectBase.Data.Logs;
using System;
using System.IO;

namespace ProjectBase.Data.Excel
{
    public interface IReportExport
    {
        void GenerateData(HSSFWorkbook templatebook);
    }

    public class ExcelHelper
    {
        private HSSFWorkbook hssfworkbook;

        private string Filename;
        private string Templatename;
        private IReportExport exportor;

        public void InitializeWorkbook()
        {
            string TemplatePath = string.Format("{0}", Templatename);

            FileStream file = new FileStream(@TemplatePath, FileMode.Open, FileAccess.Read);
            hssfworkbook = new HSSFWorkbook(file);

            //create a entry of DocumentSummaryInformation
            NPOI.HPSF.DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
            dsi.Company = "siasun";
            hssfworkbook.DocumentSummaryInformation = dsi;

            //create a entry of SummaryInformation
            SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
            si.Subject = "Gem System";
            hssfworkbook.SummaryInformation = si;

        }

        protected MemoryStream WriteToStream()
        {
            MemoryStream file = new MemoryStream();

            hssfworkbook.Write(file);
            return file;
        }

        public ISheet PrintSheet()
        {
            return hssfworkbook.GetSheet(Templatename);
        }

        public void WriteToFile()
        {
            //删除文件
            System.IO.File.Delete(Filename);// 删除文件
            FileStream file = new FileStream(Filename, FileMode.Create);
            hssfworkbook.Write(file);

            file.Close();
            // return file;

        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="filename">导出的文件名</param>
        /// <param name="templatefile">模板文件路径</param> 
        /// <param name="exp">适配器</param>
        public ExcelHelper(string filename, string templatefile, IReportExport exp)
        {
            Filename = filename;
            Templatename = templatefile;
            exportor = exp;
        }

        protected void GenerateData(HSSFWorkbook templatebook)
        {
            exportor.GenerateData(templatebook);
        }

        public bool ExportSheet()
        {
            try
            {
                InitializeWorkbook();
                this.GenerateData(hssfworkbook);
            }
            catch (Exception ex)
            {
                LogHelper.log.Error(Templatename + "保存文档失败，失败原因为", ex);
                return false;
            }
            return true;
        }

        public bool Export()
        {
            try
            {
                InitializeWorkbook();
                this.GenerateData(hssfworkbook);
                WriteToFile();
            }
            catch (Exception ex)
            {
                LogHelper.log.Error(Templatename + "保存文档失败，失败原因为", ex);
                return false;
            }
            return true;
        }
    }
}