namespace QWERTYkez.ExcelProcessor.Editors;

/// <summary>
/// Внутренняя реализация <see cref="IRange"/>.
/// </summary>
internal sealed class ExcelRange : IRange
{
    private readonly ExcelWriter _writer;
    private readonly ExcelSheet _sheet;
    private uint _rowStart, _rowEnd;
    private uint _colStart, _colEnd;

    internal ExcelRange(ExcelWriter writer, ExcelSheet sheet, uint rowStart, uint colStart, uint rowEnd, uint colEnd)
    {
        _writer = writer;
        _sheet = sheet;
        _rowStart = rowStart;
        _rowEnd = rowEnd;
        _colStart = colStart;
        _colEnd = colEnd;
    }

    public uint RowStart => _rowStart;
    public uint RowEnd => _rowEnd;
    public uint ColStart => _colStart;
    public uint ColEnd => _colEnd;
    public string ColStartLetter => CellAddressHelper.ColumnIndexToLetter(_colStart);
    public string ColEndLetter => CellAddressHelper.ColumnIndexToLetter(_colEnd);
    public uint Rows => _rowEnd - _rowStart + 1;
    public uint Cols => _colEnd - _colStart + 1;

    public bool IsMerged
    {
        get
        {
            _writer.ThrowIfDisposed();
            lock (_writer._syncLock)
            {
                var mergeCells = GetMergeCells();
                if (mergeCells == null) return false;
                foreach (var mergeCell in mergeCells.Elements<MergeCell>())
                {
                    if (TryParseRangeReference(mergeCell.Reference?.Value ?? string.Empty, out var refRange))
                    {
                        if (refRange._rowStart == _rowStart && refRange._rowEnd == _rowEnd &&
                            refRange._colStart == _colStart && refRange._colEnd == _colEnd)
                            return true;
                    }
                }
                return false;
            }
        }
    }







    /// <summary>
    /// Перемещает текущий диапазон в новую позицию (как "вырезать-вставить").
    /// Исходный диапазон очищается, а текущий объект IRange перемещается на новое место.
    /// </summary>
    /// <param name="newRow">Номер строки для нового верхнего левого угла.</param>
    /// <param name="newCol">Номер столбца для нового верхнего левого угла.</param>
    /// <returns>Тот же объект IRange с новыми координатами.</returns>
    public IRange MoveTo(uint newRow, uint newCol)
    {
        if (newRow == _rowStart && newCol == _colStart) return this;
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            uint newRowEnd = newRow + (_rowEnd - _rowStart);
            uint newColEnd = newCol + (_colEnd - _colStart);
            bool overlap = RangesOverlap(_rowStart, _colStart, _rowEnd, _colEnd, newRow, newCol, newRowEnd, newColEnd);
            bool horizontalShift = (newRow == _rowStart);
            bool verticalShift = (newCol == _colStart);

            if (!overlap)
            {
                CopyCells(_rowStart, _colStart, _rowEnd, _colEnd, newRow, newCol, CopyOrder.Any);
                ClearRangeData(_rowStart, _colStart, _rowEnd, _colEnd);
            }
            else if (horizontalShift)
            {
                CopyOrder order = (newCol > _colStart) ? CopyOrder.RightToLeft : CopyOrder.LeftToRight;
                CopyCells(_rowStart, _colStart, _rowEnd, _colEnd, newRow, newCol, order);
                ClearRangeData(_rowStart, _colStart, _rowEnd, _colEnd);
            }
            else if (verticalShift)
            {
                CopyOrder order = (newRow > _rowStart) ? CopyOrder.BottomToTop : CopyOrder.TopToBottom;
                CopyCells(_rowStart, _colStart, _rowEnd, _colEnd, newRow, newCol, order);
                ClearRangeData(_rowStart, _colStart, _rowEnd, _colEnd);
            }
            else
            {
                // Диагональное перемещение – два последовательных сдвига
                MoveTo(_rowStart, newCol);
                MoveTo(newRow, _colStart);
                return this;
            }

            _rowStart = newRow;
            _rowEnd = newRowEnd;
            _colStart = newCol;
            _colEnd = newColEnd;
            return this;
        }
    }

    public IRange MoveTo(uint rowIndex, string colIndex)
    {
        return MoveTo(rowIndex, CellAddressHelper.ColumnLetterToIndex(colIndex));
    }

    private enum CopyOrder
    {
        Any,
        LeftToRight,
        RightToLeft,
        TopToBottom,
        BottomToTop
    }

    /// <summary>Копирует ячейки из исходного диапазона в целевой, поддерживая различные порядки обхода.</summary>
    private void CopyCells(uint srcRowStart, uint srcColStart, uint srcRowEnd, uint srcColEnd,
                           uint dstRowStart, uint dstColStart, CopyOrder order)
    {
        // Определяем все строки, которые могут понадобиться (исходные и целевые)
        var rowIndices = new HashSet<uint>();
        for (uint r = srcRowStart; r <= srcRowEnd; r++) rowIndices.Add(r);
        uint dstRowEnd = dstRowStart + (srcRowEnd - srcRowStart);
        for (uint r = dstRowStart; r <= dstRowEnd; r++) rowIndices.Add(r);
        var rowsDict = GetRowDictionary(rowIndices);

        int rowStep = 1, colStep = 1;
        int rowStart = (int)srcRowStart, rowEnd = (int)srcRowEnd;
        int colStart = (int)srcColStart, colEnd = (int)srcColEnd;

        if (order == CopyOrder.BottomToTop)
        {
            rowStep = -1;
            rowStart = (int)srcRowEnd;
            rowEnd = (int)srcRowStart;
        }
        if (order == CopyOrder.RightToLeft)
        {
            colStep = -1;
            colStart = (int)srcColEnd;
            colEnd = (int)srcColStart;
        }

        for (int r = rowStart; (rowStep > 0 ? r <= rowEnd : r >= rowEnd); r += rowStep)
        {
            if (!rowsDict.TryGetValue((uint)r, out var srcRow))
                continue;

            for (int c = colStart; (colStep > 0 ? c <= colEnd : c >= colEnd); c += colStep)
            {
                Cell? srcCell = FindCellInRowFast(srcRow, (uint)c);
                if (srcCell == null) continue;

                Cell cloned = (Cell)srcCell.CloneNode(true);
                uint dstRow = dstRowStart + (uint)(r - srcRowStart);
                uint dstCol = dstColStart + (uint)(c - srcColStart);
                cloned.CellReference = $"{CellAddressHelper.ColumnIndexToLetter(dstCol)}{dstRow}";
                InsertCellAt(dstRow, dstCol, cloned);
            }
        }
    }

    /// <summary>Строит словарь строк для указанных индексов строк.</summary>
    private Dictionary<uint, Row> GetRowDictionary(HashSet<uint> rowIndices)
    {
        var dict = new Dictionary<uint, Row>();
        var sheetData = _sheet.GetSheetData();
        foreach (var row in sheetData.Elements<Row>())
        {
            if (row.RowIndex?.Value is uint idx && rowIndices.Contains(idx))
                dict[idx] = row;
        }
        return dict;
    }

    /// <summary>Быстрый поиск ячейки в строке (линейный, подходит для типичного количества ячеек в строке).</summary>
    private Cell? FindCellInRowFast(Row row, uint colIndex)
    {
        foreach (var cell in row.Elements<Cell>())
        {
            if (CellAddressHelper.TryParseCellReference(cell.CellReference?.Value ?? string.Empty, out _, out uint col) && col == colIndex)
                return cell;
        }
        return null;
    }

    /// <summary>Проверяет, пересекаются ли два прямоугольных диапазона.</summary>
    private static bool RangesOverlap(uint r1s, uint c1s, uint r1e, uint c1e,
                                       uint r2s, uint c2s, uint r2e, uint c2e)
    {
        return !(r1e < r2s || r2e < r1s || c1e < c2s || c2e < c1s);
    }

    /// <summary>Вставляет ячейку в указанную позицию, предварительно удаляя существующую.</summary>
    private void InsertCellAt(uint row, uint col, Cell cell)
    {
        DeleteCellAt(row, col);
        var sheetData = _sheet.GetSheetData();
        var rowElement = GetOrCreateRowElement(sheetData, row);
        InsertCellInRow(rowElement, cell, col);
    }

    /// <summary>Удаляет ячейку, если она существует.</summary>
    private void DeleteCellAt(uint row, uint col)
    {
        var sheetData = _sheet.GetSheetData();
        var rowElement = FindRowElement(sheetData, row);
        if (rowElement == null) return;
        var cell = FindCellInRow(rowElement, col);
        cell?.Remove();
    }

    /// <summary>Получает или создаёт строку с указанным индексом.</summary>
    private Row GetOrCreateRowElement(SheetData sheetData, uint rowIndex)
    {
        var existing = FindRowElement(sheetData, rowIndex);
        if (existing != null) return existing;
        var newRow = new Row { RowIndex = rowIndex };
        InsertRowElement(sheetData, newRow, rowIndex);
        return newRow;
    }

    /// <summary>Вставляет ячейку в строку с сохранением порядка столбцов.</summary>
    private void InsertCellInRow(Row row, Cell cell, uint colIndex)
    {
        string newRef = $"{CellAddressHelper.ColumnIndexToLetter(colIndex)}{row.RowIndex?.Value ?? 1}";
        cell.CellReference = newRef;
        bool inserted = false;
        foreach (var existing in row.Elements<Cell>().ToList())
        {
            if (CellAddressHelper.TryParseCellReference(existing.CellReference?.Value ?? string.Empty, out _, out uint existingCol) &&
                existingCol > colIndex)
            {
                existing.InsertBeforeSelf(cell);
                inserted = true;
                break;
            }
        }
        if (!inserted) row.Append(cell);
    }

    /// <summary>Очищает данные (содержимое) в указанном диапазоне.</summary>
    private void ClearRangeData(uint rowStart, uint colStart, uint rowEnd, uint colEnd)
    {
        for (uint r = rowStart; r <= rowEnd; r++)
        {
            var row = FindRowElement(_sheet.GetSheetData(), r);
            if (row == null) continue;
            for (uint c = colStart; c <= colEnd; c++)
            {
                var cell = FindCellInRow(row, c);
                cell?.Remove();
            }
        }
    }








    public bool TryMerge()
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            if (IsMerged) return false;
            var worksheet = _sheet.Worksheet;

            var mergeCells = worksheet.GetFirstChild<MergeCells>();
            if (mergeCells == null)
            {
                mergeCells = new MergeCells();
                worksheet.Append(mergeCells);
            }
            string refStr = $"{ColStartLetter}{RowStart}:{ColEndLetter}{RowEnd}";
            mergeCells.Append(new MergeCell { Reference = refStr });
            return true;
        }
    }

    public void Unmerge()
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            var mergeCells = GetMergeCells();
            if (mergeCells == null) return;
            var toRemove = mergeCells.Elements<MergeCell>()
                .FirstOrDefault(mc => TryParseRangeReference(mc.Reference?.Value ?? string.Empty, out var rng) &&
                                      rng._rowStart == _rowStart && rng._rowEnd == _rowEnd &&
                                      rng._colStart == _colStart && rng._colEnd == _colEnd);
            toRemove?.Remove();
        }
    }

    public IRange? GetMergedRange()
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            var mergeCells = GetMergeCells();
            if (mergeCells == null) return null;
            foreach (var mergeCell in mergeCells.Elements<MergeCell>())
            {
                if (TryParseRangeReference(mergeCell.Reference?.Value ?? string.Empty, out var refRange))
                {
                    if (refRange._rowStart >= _rowStart && refRange._rowEnd <= _rowEnd &&
                        refRange._colStart >= _colStart && refRange._colEnd <= _colEnd)
                        return refRange;
                }
            }
            return null;
        }
    }

    public bool TryGetMergedRange(IRange range)
    {
        var merged = GetMergedRange();
        if (merged == null) return false;
        return merged.Equals(range);
    }

    public IRange SetNumberFormat(NumberFormatPattern format)
    {
        if (format == null) return this;
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            int fmtId = GetOrCreateNumberFormatId(format);
            for (uint r = _rowStart; r <= _rowEnd; r++)
            {
                for (uint c = _colStart; c <= _colEnd; c++)
                {
                    var cell = GetCellInternal(r, c);
                    cell?.StyleIndex = (uint)fmtId;
                }
            }
        }
        return this;
    }

    /// <inheritdoc />
    public IRange SetCellAlign(CellAlign align)
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            int styleIndex = _writer.GetOrCreateCellFormatId(
                numberFormat: null,
                font: null,
                fill: null,
                border: null,
                align: align
            );
            ApplyStyleToRange((uint)styleIndex);
            return this;
        }
    }

    /// <inheritdoc />
    public IRange SetCellBorder(CellBorder border)
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            int styleIndex = _writer.GetOrCreateCellFormatId(
                numberFormat: null,
                font: null,
                fill: null,
                border: border,
                align: null
            );
            ApplyStyleToRange((uint)styleIndex);
            return this;
        }
    }

    /// <inheritdoc />
    public IRange SetCellFill(CellFill fill)
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            int styleIndex = _writer.GetOrCreateCellFormatId(
                numberFormat: null,
                font: null,
                fill: fill,
                border: null,
                align: null
            );
            ApplyStyleToRange((uint)styleIndex);
            return this;
        }
    }

    /// <inheritdoc />
    public IRange SetCellFont(CellFont font)
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            int styleIndex = _writer.GetOrCreateCellFormatId(
                numberFormat: null,
                font: font,
                fill: null,
                border: null,
                align: null
            );
            ApplyStyleToRange((uint)styleIndex);
            return this;
        }
    }

    /// <summary>
    /// Применяет стиль ко всем ячейкам диапазона.
    /// </summary>
    /// <param name="styleIndex">Индекс стиля для применения.</param>
    /// <param name="createIfMissing">Если true, создаёт недостающие ячейки (по умолчанию true).</param>
    private void ApplyStyleToRange(uint styleIndex, bool createIfMissing = true)
    {
        for (uint row = _rowStart; row <= _rowEnd; row++)
        {
            for (uint col = _colStart; col <= _colEnd; col++)
            {
                var cell = GetCellInternal(row, col);
                if (cell != null)
                {
                    cell.StyleIndex = styleIndex;
                }
                else if (createIfMissing)
                {
                    var newCell = new Cell
                    {
                        CellReference = $"{CellAddressHelper.ColumnIndexToLetter(col)}{row}",
                        StyleIndex = styleIndex
                    };
                    InsertCellAt(row, col, newCell);
                }
            }
        }
    }

    public IEnumerable<ICell> Cells
    {
        get
        {
            for (uint r = _rowStart; r <= _rowEnd; r++)
                for (uint c = _colStart; c <= _colEnd; c++)
                    yield return new ExcelCell(_writer, _sheet, r, c);
        }
    }

    public bool GetSubCell(uint row, uint col, out ICell cell)
    {
        uint globalRow = _rowStart + row - 1;
        uint globalCol = _colStart + col - 1;
        if (globalRow > _rowEnd || globalCol > _colEnd)
        {
            cell = default!;
            return false;
        }
        cell = new ExcelCell(_writer, _sheet, globalRow, globalCol);
        return true;
    }

    public bool GetSubCell(uint row, string col, out ICell cell)
    {
        uint colIndex = CellAddressHelper.ColumnLetterToIndex(col);
        return GetSubCell(row, colIndex, out cell);
    }

    public bool TryEditSubCell(uint row, uint col, Action<ICell> edit)
    {
        if (GetSubCell(row, col, out var cell))
        {
            edit(cell);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, string value)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, bool value)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, string formula, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(formula, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, DateTime value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, decimal value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, double value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, float value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, int value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, uint col, long value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }



    public bool TryEditSubCell(uint row, string col, Action<ICell> edit)
    {
        if (GetSubCell(row, col, out var cell))
        {
            edit(cell);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, string value)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, bool value)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, string formula, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(formula, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, DateTime value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, decimal value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, double value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, float value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, int value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }

    public bool TryEditSubCell(uint row, string col, long value, NumberFormatPattern? format = null)
    {
        if (GetSubCell(row, col, out var cell))
        {
            cell.Set(value, format);
            return true;
        }
        return false;
    }



    public void ClearContents()
    {
        ClearRangeData(_rowStart, _colStart, _rowEnd, _colEnd);
    }

    public void ClearFormats()
    {
        for (uint r = _rowStart; r <= _rowEnd; r++)
            for (uint c = _colStart; c <= _colEnd; c++)
            {
                var cell = GetCellInternal(r, c);
                cell?.StyleIndex = null;
            }
    }

    public void Clear()
    {
        ClearContents();
        ClearFormats();
    }

    public IRange CopyTo(uint rowIndex, uint colIndex, out IRange copiedRange)
    {
        _writer.ThrowIfDisposed();
        lock (_writer._syncLock)
        {
            CopyData(_rowStart, _colStart, _rowEnd, _colEnd, rowIndex, colIndex);
            copiedRange = new ExcelRange(_writer, _sheet, rowIndex, colIndex, rowIndex + Rows - 1, colIndex + Cols - 1);
            return this;
        }
    }

    public IRange CopyTo(uint rowIndex, string colIndex, out IRange copiedRange)
    {
        uint col = CellAddressHelper.ColumnLetterToIndex(colIndex);
        return CopyTo(rowIndex, col, out copiedRange);
    }

    // Вспомогательные методы

    private Cell? GetCellInternal(uint row, uint col)
    {
        var sheetData = _sheet.GetSheetData();
        var rowElement = FindRowElement(sheetData, row);
        if (rowElement == null) return null;
        return FindCellInRow(rowElement, col);
    }

    private void CopyData(uint srcRowStart, uint srcColStart, uint srcRowEnd, uint srcColEnd, uint dstRowStart, uint dstColStart)
    {
        // Сохраняем все значения и форматы из исходного диапазона
        var cellsData = new List<(uint row, uint col, Cell cell)>();
        for (uint r = srcRowStart; r <= srcRowEnd; r++)
        {
            for (uint c = srcColStart; c <= srcColEnd; c++)
            {
                var cell = GetCellInternal(r, c);
                if (cell != null)
                {
                    var cloned = (Cell)cell.CloneNode(true);
                    cellsData.Add((r - srcRowStart + dstRowStart, c - srcColStart + dstColStart, cloned));
                }
            }
        }
        // Вставляем в новый диапазон
        foreach (var (row, col, clonedCell) in cellsData)
        {
            InsertCellAt(row, col, clonedCell);
        }
        // Копируем ширины столбцов
        for (uint c = srcColStart; c <= srcColEnd; c++)
        {
            var srcCol = GetColumnElementForIndex(c);
            if (srcCol?.Width is { } width)
            {
                uint targetCol = c - srcColStart + dstColStart;
                var dstCol = GetOrCreateColumnElementForIndex(targetCol);
                dstCol.Width = width;
                dstCol.CustomWidth = srcCol.CustomWidth;
            }
        }
        // Копируем высоты строк
        for (uint r = srcRowStart; r <= srcRowEnd; r++)
        {
            var srcRow = FindRowElement(_sheet.GetSheetData(), r);
            if (srcRow is { } row
                && row.Height?.Value is { } hei
                && row.CustomHeight?.Value == true)
            {
                uint targetRow = r - srcRowStart + dstRowStart;
                var dstRow = GetOrCreateRowElement(targetRow);
                dstRow.Height = hei;
                dstRow.CustomHeight = true;
            }
        }
    }

    private Row GetOrCreateRowElement(uint rowIndex)
    {
        var existing = FindRowElement(_sheet.GetSheetData(), rowIndex);
        if (existing != null) return existing;
        var newRow = new Row { RowIndex = rowIndex };
        InsertRowElement(_sheet.GetSheetData(), newRow, rowIndex);
        return newRow;
    }

    private static Row? FindRowElement(SheetData sheetData, uint rowIndex)
    {
        foreach (var row in sheetData.Elements<Row>())
            if (row.RowIndex?.Value == rowIndex) return row;
        return null;
    }

    private static void InsertRowElement(SheetData sheetData, Row row, uint rowIndex)
    {
        bool inserted = false;
        foreach (var existing in sheetData.Elements<Row>().ToList())
        {
            if (existing.RowIndex?.Value > rowIndex)
            {
                existing.InsertBeforeSelf(row);
                inserted = true;
                break;
            }
        }
        if (!inserted) sheetData.Append(row);
    }

    private Cell? FindCellInRow(Row row, uint colIndex)
    {
        foreach (var cell in row.Elements<Cell>())
        {
            if (CellAddressHelper.TryParseCellReference(cell.CellReference?.Value ?? string.Empty, out _, out uint col) && col == colIndex)
                return cell;
        }
        return null;
    }

    private Column? GetColumnElementForIndex(uint col)
    {
        var worksheet = _sheet.Worksheet;
        var cols = worksheet.GetFirstChild<Columns>();
        if (cols == null) return null;
        foreach (Column c in cols.Elements<Column>())
            if (c.Min?.Value is { } min
             && c.Max?.Value is { } max
             && min <= col
             && max >= col)
                return c;
        return null;
    }

    private Column GetOrCreateColumnElementForIndex(uint col)
    {
        var existing = GetColumnElementForIndex(col);
        if (existing != null) return existing;
        var worksheet = _sheet.Worksheet;
        var cols = worksheet.GetFirstChild<Columns>();
        if (cols == null)
        {
            cols = new Columns();
            worksheet.InsertAt(cols, 0);
        }
        var newCol = new Column
        {
            Min = col,
            Max = col,
            Width = 8.43,
            CustomWidth = true
        };
        cols.Append(newCol);
        return newCol;
    }

    private MergeCells? GetMergeCells() =>
        _sheet.Worksheet.GetFirstChild<MergeCells>();

    private bool TryParseRangeReference(string reference, out ExcelRange range)
    {
        range = null!;
        if (string.IsNullOrEmpty(reference)) return false;
        string[] parts = reference.Split(':');
        if (parts.Length != 2) return false;
        if (!CellAddressHelper.TryParseCellReference(parts[0] + "1", out uint row1, out uint col1)) return false;
        if (!CellAddressHelper.TryParseCellReference(parts[1] + "1", out uint row2, out uint col2)) return false;
        uint rowStart = Math.Min(row1, row2), rowEnd = Math.Max(row1, row2);
        uint colStart = Math.Min(col1, col2), colEnd = Math.Max(col1, col2);
        range = new ExcelRange(_writer, _sheet, rowStart, colStart, rowEnd, colEnd);
        return true;
    }

    // создаёт стиль только с числовым форматом
    private int GetOrCreateNumberFormatId(NumberFormatPattern format)
    {
        return _writer.GetOrCreateCellFormatId(numberFormat: format);
    }
}