using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using JNPF.FriendlyException;
using Microsoft.AspNetCore.Http;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

namespace Tnb.WarehouseMgr
{
    public class ExcelDataImportManager : BaseWareHouseService
    {
        /// <summary>
        /// 解析Excel到内存
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        protected Task<List<Dictionary<string, object>>> ImportExcelToMemory(IFormFile file)
        {
            int rowIndex = 1;
            List<Dictionary<string, object>> dics = new();
            IWorkbook? workbook = null;
            try
            {
                using (Stream stream = file.OpenReadStream())
                {
                    // 2007版本
                    if (file.Name.IndexOf(".xlsx") > 0)
                    {
                        workbook = new XSSFWorkbook(stream);
                    }
                    else if (file.Name.IndexOf(".xls") > 0)
                    {
                        workbook = new HSSFWorkbook(stream);
                    }

                    ISheet? sheet = workbook?.GetSheetAt(0);
                    if (workbook == null || sheet == null) throw Oops.Bah("无导入数据");
                    if (sheet?.LastRowNum <= 1) throw Oops.Bah("无导入数据");

                    ICellStyle style = workbook.CreateCellStyle();
                    IFont font = workbook.CreateFont();
                    font.Color = IndexedColors.Black.Index; // 将字体颜色设置为黑色
                    style.SetFont(font);
                    var nameRow = sheet?.GetRow(0);
                    if (nameRow != null)
                    {
                        Dictionary<string, object> dic = new Dictionary<string, object>();
                        List<string> columns = new List<string>();
                        columns = nameRow.Cells.Select(x => x.StringCellValue).ToList();
                        columns.ForEach(x =>
                        {
                            var strings = x.Split(new char[2] { '(', ')' }, StringSplitOptions.RemoveEmptyEntries);
                            x = strings[1];
                        });
                        if (columns?.Count > 0)
                        {
                            for (rowIndex = 1; rowIndex <= sheet?.LastRowNum; rowIndex++)
                            {
                                var row = sheet?.GetRow(rowIndex);
                                if (row != null)
                                {
                                    foreach (var col in columns)
                                    {
                                        ICell cell = row.GetCell(columns.IndexOf(col));
                                        dic.Add(col, cell.StringCellValue);
                                    }
                                    dics.Add(dic);
                                }
                            }
                        }
                    }
                }
            }
            catch (Exception)
            {
                throw;
            }
            return Task.FromResult(dics);
        }

        public async Task<dynamic?> GenImportTemplate(params string[] fields) 
        {
            return null;
        }
    }
}