using ClosedXML.Excel;
using ClosedXML.Excel.Drawings;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace AsbCloudInfrastructure.Services.DrillingProgram
{
#nullable enable
    internal class DrillingProgramMaker
    {
        private const int maxAllowedColumns = 256;

        public static void UniteExcelFiles(IEnumerable<string> excelFilesNames, string resultExcelPath, IEnumerable<AsbCloudApp.Data.DrillingProgramPartDto> parts, AsbCloudApp.Data.WellDto well)
        {
            var resultExcelFile = new XLWorkbook(XLEventTracking.Disabled);
            
            var titleSheet = resultExcelFile.AddWorksheet("Титульный лист");
            var marks = parts
                .Where(p => p.File is not null)
                .SelectMany(p => p.File!.FileMarks);
            var titleSheetMaker = new TitleListSheet(marks, well);
            titleSheetMaker.Draw(titleSheet);

            var contentSheet = resultExcelFile.AddWorksheet("Содержание");
            var contentListSheetMaker = new ContentListSheet(parts);
            contentListSheetMaker.Draw(contentSheet);

            var filteredFileNames = excelFilesNames.Distinct();

            foreach (var excelFileName in filteredFileNames)
            {
                using var workbookSrc = new XLWorkbook(excelFileName, XLEventTracking.Disabled);

                foreach (var sheet in workbookSrc.Worksheets)
                {
                    if (sheet.Visibility == XLWorksheetVisibility.Visible)
                        CopySheet(resultExcelFile, sheet);
                }
            }

            resultExcelFile.SaveAs(resultExcelPath,
                new SaveOptions { EvaluateFormulasBeforeSaving = true });
        }

        private static void CopySheet(XLWorkbook workbookDst, IXLWorksheet sheetSrc)
        {
            var newSheetName = sheetSrc.Name;
            var suffix = "";
            int index = 1;

            while (workbookDst.Worksheets.Contains(newSheetName))
            {
                newSheetName = sheetSrc.Name;
                suffix = $"_{index++}";
                if (newSheetName.Length + suffix.Length >= 31)
                    newSheetName = newSheetName[..(31 - suffix.Length)];
                newSheetName += suffix;
            }

            var imagesInfos = sheetSrc.Pictures.Select(p => new ImageInfo
            {
                Id = p.Id,
                Data = p.ImageStream.GetBuffer(),
                Height = p.Height,
                Width = p.Width,
                TopLeftCellAddress = p.TopLeftCell.Address,
                Left = p.Left,
                Top = p.Top
            }).ToList();

            IXLWorksheet resultSheet;

            if (sheetSrc.Columns().Count() > maxAllowedColumns)
            {
                resultSheet = workbookDst.Worksheets.Add(newSheetName);

                var rngData = GetCellsRange(sheetSrc);

                rngData.CopyTo(resultSheet.Cell(1, 1));

                var lastRowWithData = rngData.LastRowUsed().RangeAddress
                    .LastAddress.RowNumber;

                for (int i = 1; i < lastRowWithData; i++)
                {
                    resultSheet.Row(i).Height = sheetSrc.Row(i).Height;
                    resultSheet.Column(i).Width = sheetSrc.Column(i).Width;
                }
            }
            else
            {
                RemovePicturesFromSheet(sheetSrc);
                resultSheet = sheetSrc.CopyTo(workbookDst, newSheetName);
            }
            CopyImagesToAnotherSheet(imagesInfos, resultSheet);
        }

        private static IXLWorksheet CopyImagesToAnotherSheet(IEnumerable<ImageInfo> imagesInfos,
            IXLWorksheet resultSheet)
        {
            foreach (var image in imagesInfos)
            {
                var stream = new MemoryStream();
                stream.Write(image.Data, 0, image.Data.Length);

                resultSheet.AddPicture(stream)
                           .WithPlacement(XLPicturePlacement.Move)
                           .WithSize(image.Width, image.Height)
                           .MoveTo(resultSheet.Cell(image.TopLeftCellAddress),
                                   image.Left, image.Top);
            }

            return resultSheet;
        }

        private static void RemovePicturesFromSheet(IXLWorksheet sheet)
        {
            var filteredPics = sheet.Pictures.Select(p => p.Name).Distinct().ToList();

            foreach (var n in filteredPics)
                sheet.Pictures.Delete(n);
        }

        private static IXLRange GetCellsRange(IXLWorksheet sheet)
        {
            var firstTableCell = sheet.FirstCellUsed();
            var lastTableCell = sheet.LastCellUsed();
            var rngData = sheet.Range(firstTableCell.Address, lastTableCell.Address);

            return rngData;
        }
    }
#nullable disable
}