using QWERTYkez.ExcelProcessor.Editors;
using System.Runtime.InteropServices;

namespace QWERTYkez.ExcelProcessor;

/// <summary>
/// Предоставляет потокобезопасный процессор для чтения и записи документов Excel (xlsx / xlsm) формата.
/// <para>Наследует от <see cref="ExcelReader"/> и добавляет операции изменения документа.</para>
/// </summary>
internal sealed class ExcelWriter : ExcelReader, IExcelReader, IExcelWriter
{
    // Работа с общей таблицей строк
    private SharedStringTablePart? _sharedStringPart;
    private SharedStringTable? _sharedStringTable;

    internal static Dictionary<int, double>? _calibrationTable; // cw -> width_pts

    internal bool TryGetCalibrateCoeff(double targetPoints, out double result)
    {
        result = 0;
        try
        {
            // Используем Interop для точной калибровки
            _calibrationTable ??= CalibrateWidthCoeffUsingInterop();
        }
        catch { }

        _calibrationTable ??= [];
        if (_calibrationTable.Count < 2)
            return false;

        // Получаем отсортированные по ключу пары
        var keys = _calibrationTable.Keys.OrderBy(k => k).ToList();
        int lastIndex = keys.Count - 1;
        if (targetPoints <= _calibrationTable[keys[0]])
        {
            result = keys[0];
            return true;
        }
        if (targetPoints >= _calibrationTable[keys[lastIndex]])
        {
            result = keys[lastIndex];
            return true;
        }

        // Бинарный поиск интервала
        int left = 0, right = keys.Count - 1;
        while (right - left > 1)
        {
            int mid = (left + right) / 2;
            if (_calibrationTable[keys[mid]] < targetPoints)
                left = mid;
            else right = mid;
        }

        int cwLow = keys[left];
        int cwHigh = keys[right];
        double widthLow = _calibrationTable[cwLow];
        double widthHigh = _calibrationTable[cwHigh];

        // Линейная интерполяция
        result = cwLow + (targetPoints - widthLow) * (cwHigh - cwLow) / (widthHigh - widthLow);
        return true;
    }

    private Dictionary<int, double> CalibrateWidthCoeffUsingInterop()
    {
        object? excelApp = null;
        object? workbooks = null;
        object? workbook = null;
        object? sheets = null;
        object? worksheet = null;
        object? columns = null;
        object? columnA = null;

        try
        {
            Type? excelType = Type.GetTypeFromProgID("Excel.Application")
                ?? throw new InvalidOperationException("Excel не установлен");

            excelApp = Activator.CreateInstance(excelType);
            dynamic dynamicApp = excelApp;
            dynamicApp.DisplayAlerts = false;
            dynamicApp.ScreenUpdating = false;

            workbooks = dynamicApp.Workbooks;
            workbook = ((dynamic)workbooks).Add();

            // Избегаем скрытых ссылок: сначала получаем коллекцию Sheets, потом элемент
            sheets = ((dynamic)workbook).Sheets;
            worksheet = ((dynamic)sheets)[1];

            columns = ((dynamic)worksheet).Columns;
            columnA = ((dynamic)columns)[1];

            var table = new Dictionary<int, double>();
            dynamic dynamicColumnA = columnA;

            for (int cw = 1; cw <= 100; cw++)
            {
                dynamicColumnA.ColumnWidth = cw;
                double widthPt = (double)dynamicColumnA.Width;
                double widthCm = (double)dynamicApp.PointsToCentimeters(widthPt);
                table.Add(cw, widthCm);
            }

            return table;
        }
        finally
        {
            // Освобождаем строго в обратном порядке создания
            if (columnA != null) Marshal.ReleaseComObject(columnA);
            if (columns != null) Marshal.ReleaseComObject(columns);
            if (worksheet != null) Marshal.ReleaseComObject(worksheet);
            if (sheets != null) Marshal.ReleaseComObject(sheets);

            if (workbook != null)
            {
                try { ((dynamic)workbook).Close(false); } catch { }
                Marshal.ReleaseComObject(workbook);
            }
            if (workbooks != null) Marshal.ReleaseComObject(workbooks);

            if (excelApp != null)
            {
                try { ((dynamic)excelApp).Quit(); } catch { }
                Marshal.ReleaseComObject(excelApp);
            }

            // Принудительный запуск сборщика мусора для очистки dynamic-оберток
            GC.Collect();
            GC.WaitForPendingFinalizers();
        }
    }


    private void EnsureSharedStringTable()
    {
        if (_sharedStringPart != null) return;
        _sharedStringPart = _doc.WorkbookPart?.GetPartsOfType<SharedStringTablePart>().FirstOrDefault();
        if (_sharedStringPart == null)
        {
            _sharedStringPart = _doc.WorkbookPart?.AddNewPart<SharedStringTablePart>();
            _sharedStringPart!.SharedStringTable = new SharedStringTable();
        }
        _sharedStringTable = _sharedStringPart.SharedStringTable;
    }

    internal string GetSharedString(uint index)
    {
        EnsureSharedStringTable();
        if (_sharedStringTable?.Count?.Value is not { } val || index >= val)
            return string.Empty;
        var si = _sharedStringTable.ElementAt((int)index);
        // Обычный текст
        var text = si.GetFirstChild<Text>()?.Text;
        if (text != null) return text;
        // Rich text
        var sb = new StringBuilder();
        foreach (var run in si.Elements<Run>())
        {
            sb.Append(run.GetFirstChild<Text>()?.Text);
        }
        return sb.ToString();
    }

    internal int GetOrAddSharedString(string value)
    {
        EnsureSharedStringTable();
        if (_sharedStringTable == null) return -1;
        // Поиск существующей строки
        int idx = 0;
        foreach (var si in _sharedStringTable.Elements<SharedStringItem>())
        {
            var text = si.GetFirstChild<Text>()?.Text;
            if (text == value) return idx;
            idx++;
        }
        // Добавление новой
        var newSi = new SharedStringItem();
        newSi.Append(new Text(value));
        _sharedStringTable.Append(newSi);
        _sharedStringTable.Count = (uint)_sharedStringTable.Elements<SharedStringItem>().Count();
        return idx;
    }

    // Определение заблокирована ли ячейка
    internal bool IsCellLocked(uint styleIndex)
    {
        var cellFormat = GetCellFormatAt(styleIndex);
        if (cellFormat == null) return false;
        // По умолчанию ячейка заблокирована, если Protection не задан или Locked = true
        return cellFormat.Protection == null || cellFormat.Protection.Locked == null || cellFormat.Protection.Locked.Value;
    }

    // Кэши числовых форматов
    private readonly Dictionary<string, NumberFormatPattern> _numberFormatCache = [];
    private readonly Dictionary<uint, NumberFormatPattern> _numberFormatIdToPattern = [];

    // Кэши для компонентов стилей (чтобы не создавать дубликаты)
    private readonly Dictionary<CellFont, int> _fontCache = [];
    private readonly Dictionary<CellFill, int> _fillCache = [];
    private readonly Dictionary<CellBorder, int> _borderCache = [];
    private readonly Dictionary<CellAlign, int> _alignmentCache = [];

    // Кэш составных стилей (CellFormat)
    private readonly Dictionary<(int fontId, int fillId, int borderId, int alignId, int numFmtId), int> _cellFormatCache = [];

    // Конструктор, фабричные методы – без изменений (опущены)

    #region Управление числовыми форматами (расширение IBook)

    public IReadOnlyList<NumberFormatPattern> GetNumberFormats()
    {
        // Возвращаем все пользовательские форматы (Id >= 164), встроенные не включаем
        var result = new List<NumberFormatPattern>();
        var stylesheet = _doc.WorkbookPart?.WorkbookStylesPart?.Stylesheet;
        if (stylesheet?.NumberingFormats != null)
        {
            foreach (var nf in stylesheet.NumberingFormats.Elements<NumberingFormat>())
            {
                if (nf.NumberFormatId?.Value >= 164 && nf.FormatCode?.Value is string code)
                {
                    var pattern = new NumberFormatPattern(code);
                    pattern.Attach((ushort)nf.NumberFormatId.Value);
                    result.Add(pattern);
                }
            }
        }
        return result;
    }

    public NumberFormatPattern CreateNumberFormat(string formatCode)
    {
        if (string.IsNullOrEmpty(formatCode)) throw new ArgumentException("Format code cannot be empty", nameof(formatCode));

        lock (_syncLock)
        {
            return CreateNumberFormatInternal(formatCode);
        }
    }

    // Внутренний метод получения NumberFormatPattern по индексу стиля ячейки
    internal NumberFormatPattern? GetNumberFormat(uint cellStyleIndex)
    {
        var cellFormat = GetCellFormatAt(cellStyleIndex);
        if (cellFormat?.NumberFormatId?.Value is uint numFmtId && cellFormat.ApplyNumberFormat?.Value == true)
        {
            if (_numberFormatIdToPattern.TryGetValue(numFmtId, out var pattern))
                return pattern;
            // Пытаемся найти в стилях книги
            var stylesheet = _doc.WorkbookPart?.WorkbookStylesPart?.Stylesheet;
            if (stylesheet?.NumberingFormats != null)
            {
                foreach (var nf in stylesheet.NumberingFormats.Elements<NumberingFormat>())
                {
                    if (nf.NumberFormatId?.Value == numFmtId && nf.FormatCode?.Value is string code)
                    {
                        pattern = new NumberFormatPattern(code);
                        pattern.Attach((ushort)numFmtId);
                        _numberFormatIdToPattern[numFmtId] = pattern;
                        return pattern;
                    }
                }
            }
            // Встроенный формат
            if (numFmtId < 164)
            {
                // Для встроенных форматов код формата определяем по специальной таблице (не хардкодим!).
                // Вместо этого возвращаем формат только с Id, без FormatCode.
                pattern = new NumberFormatPattern(string.Empty);
                pattern.Attach((ushort)numFmtId);
                _numberFormatIdToPattern[numFmtId] = pattern;
                return pattern;
            }
        }
        return null;
    }

    #endregion

    #region Управление составными стилями (CellFormat)

    // Получить индекс CellFormat для комбинации компонентов
    internal int GetOrCreateCellFormatId(
        NumberFormatPattern? numberFormat = null,
        CellFont? font = null,
        CellFill? fill = null,
        CellBorder? border = null,
        CellAlign? align = null)
    {
        lock (_syncLock)
        {
            // Получаем или создаём числовой формат ID
            int numFmtId = -1;
            if (numberFormat != null)
            {
                if (numberFormat.Id.HasValue && numberFormat.Id.Value < 164)
                    numFmtId = numberFormat.Id.Value;
                else
                    numFmtId = (int)GetOrCreateNumberFormatId(numberFormat);
            }

            // Получаем или создаём Font, Fill, Border, Alignment
            int fontId = font.HasValue ? GetOrCreateFontId(font.Value) : -1;
            int fillId = fill.HasValue ? GetOrCreateFillId(fill.Value) : -1;
            int borderId = border.HasValue ? GetOrCreateBorderId(border.Value) : -1;
            int alignId = align.HasValue ? GetOrCreateAlignmentId(align.Value) : -1;

            var key = (fontId, fillId, borderId, alignId, numFmtId);
            if (_cellFormatCache.TryGetValue(key, out int existingIndex))
                return existingIndex;

            var stylesheet = EnsureStylesheet();
            var cellFormats = stylesheet.CellFormats ?? CreateCellFormats(stylesheet);

            var cellFormat = new CellFormat();
            if (fontId >= 0)
            {
                cellFormat.FontId = (uint)fontId;
                cellFormat.ApplyFont = true;
            }
            if (fillId >= 0)
            {
                cellFormat.FillId = (uint)fillId;
                cellFormat.ApplyFill = true;
            }
            if (borderId >= 0)
            {
                cellFormat.BorderId = (uint)borderId;
                cellFormat.ApplyBorder = true;
            }
            if (alignId >= 0)
            {
                cellFormat.Alignment = GetAlignmentFromCache(alignId);
                cellFormat.ApplyAlignment = true;
            }
            if (numFmtId >= 0)
            {
                cellFormat.NumberFormatId = (uint)numFmtId;
                cellFormat.ApplyNumberFormat = true;
            }

            cellFormats.Append(cellFormat);
            int newIndex = (int)(cellFormats.Count?.Value ?? 0);
            cellFormats.Count = (uint)(newIndex + 1);
            _cellFormatCache[key] = newIndex;
            return newIndex;
        }
    }

    #endregion

    #region Вспомогательные методы для работы со стилями

    private Stylesheet EnsureStylesheet()
    {
        var workbookPart = _doc.WorkbookPart ?? throw new InvalidOperationException("No WorkbookPart");
        var stylesPart = workbookPart.WorkbookStylesPart;
        if (stylesPart == null)
        {
            stylesPart = workbookPart.AddNewPart<WorkbookStylesPart>();
            stylesPart.Stylesheet = new Stylesheet();
        }
        var stylesheet = stylesPart.Stylesheet!;
        if (stylesheet.Fonts == null)
        {
            stylesheet.Fonts = new Fonts();
            stylesheet.Fonts.Append(new Font()); // минимум один шрифт
            stylesheet.Fonts.Count = 1;
        }
        if (stylesheet.Fills == null)
        {
            stylesheet.Fills = new Fills();
            stylesheet.Fills.Append(new Fill { PatternFill = new PatternFill { PatternType = PatternValues.None } });
            stylesheet.Fills.Append(new Fill { PatternFill = new PatternFill { PatternType = PatternValues.Gray125 } });
            stylesheet.Fills.Count = 2;
        }
        if (stylesheet.Borders == null)
        {
            stylesheet.Borders = new Borders();
            stylesheet.Borders.Append(new Border()); // пустая граница
            stylesheet.Borders.Count = 1;
        }
        if (stylesheet.CellFormats == null)
        {
            stylesheet.CellFormats = new CellFormats();
            stylesheet.CellFormats.Append(new CellFormat()); // стандартный стиль
            stylesheet.CellFormats.Count = 1;
        }
        return stylesheet;
    }

    private uint GetOrCreateNumberFormatId(NumberFormatPattern pattern)
    {
        if (pattern.Id.HasValue)
            return (uint)pattern.Id.Value;

        // Создаём через внутренний метод (без дополнительного lock)
        var created = CreateNumberFormatInternal(pattern.Format);
        return (uint)created.Id!.Value;
    }

    private int GetOrCreateFontId(CellFont font)
    {
        if (_fontCache.TryGetValue(font, out int id))
            return id;

        var stylesheet = EnsureStylesheet();
        var fonts = stylesheet.Fonts!;
        var excelFont = font.ToFont() ?? new Font();
        fonts.Append(excelFont);
        uint newId = fonts.Count!.Value;
        fonts.Count = newId + 1u;
        return _fontCache[font] = (int)newId;
    }

    private int GetOrCreateFillId(CellFill fill)
    {
        if (_fillCache.TryGetValue(fill, out int id))
            return id;

        var stylesheet = EnsureStylesheet();
        var fills = stylesheet.Fills!;
        var excelFill = fill.ToFill() ?? new Fill { PatternFill = new PatternFill { PatternType = PatternValues.None } };
        fills.Append(excelFill);
        uint newId = fills.Count!.Value;
        fills.Count = newId + 1;
        return _fillCache[fill] = (int)newId;
    }

    private int GetOrCreateBorderId(CellBorder border)
    {
        if (_borderCache.TryGetValue(border, out int id))
            return id;

        var stylesheet = EnsureStylesheet();
        var borders = stylesheet.Borders!;
        var excelBorder = border.ToBorder() ?? new Border();
        borders.Append(excelBorder);
        int newId = (int)borders.Count!.Value;
        borders.Count = (uint)(newId + 1);
        _borderCache[border] = newId;
        return newId;
    }

    private int GetOrCreateAlignmentId(CellAlign align)
    {
        if (_alignmentCache.TryGetValue(align, out int id))
            return id;

        // Выравнивание не хранится отдельно, а встраивается в CellFormat.
        // Поэтому мы не создаём отдельный элемент, а возвращаем уникальный ID для кэша стилей.
        // Но для целостности кэша сохраняем ID.
        id = _alignmentCache.Count;
        _alignmentCache[align] = id;
        return id;
    }

    private Alignment GetAlignmentFromCache(int alignId)
    {
        foreach (var pair in _alignmentCache)
            if (pair.Value == alignId)
                return pair.Key.ToAlignment() ?? new Alignment();
        return new Alignment();
    }

    private CellFormat? GetCellFormatAt(uint index)
    {
        var stylesheet = EnsureStylesheet();
        if (stylesheet.CellFormats == null || index >= stylesheet.CellFormats.Count!.Value)
            return null;
        return (CellFormat)stylesheet.CellFormats.ElementAt((int)index);
    }

    // Вспомогательные создания коллекций
    private static NumberingFormats CreateNumberingFormats(Stylesheet stylesheet)
    {
        var nfs = new NumberingFormats();
        stylesheet.NumberingFormats = nfs;
        return nfs;
    }

    private static CellFormats CreateCellFormats(Stylesheet stylesheet)
    {
        var cfs = new CellFormats();
        stylesheet.CellFormats = cfs;
        return cfs;
    }

    #endregion



    private bool _isModified = false;

    internal ExcelWriter() { }

    #region Factory Methods

    internal static ExcelWriter? CreateFromData(ReadOnlyMemory<byte> data, string destinationPath)
    {
        if (data.IsEmpty || string.IsNullOrEmpty(destinationPath))
            return null;

        var ms = new MemoryStream();
        try
        {
            // Копируем данные в MemoryStream
            ms.Write(data.ToArray(), 0, data.Length);
            ms.Position = 0;

            var doc = SpreadsheetDocument.Open(ms, true, new OpenSettings { AutoSave = false });

            if (doc is not null)
            {
                return new ExcelWriter
                {
                    _ms = ms,
                    _doc = doc,
                    FilePath = destinationPath,
                    _originalSourcePath = null // нет исходного файла
                };
            }
            doc?.Dispose();
        }
        catch { }

        ms?.Dispose();
        return null;
    }

    internal static new ExcelWriter? CreateFromData(ReadOnlyMemory<byte> data)
    {
        if (data.IsEmpty)
            return null;

        var ms = new MemoryStream();
        try
        {
            ms.Write(data.ToArray(), 0, data.Length);
            ms.Position = 0;

            var doc = SpreadsheetDocument.Open(ms, true, new OpenSettings { AutoSave = false });

            if (doc is not null)
            {
                return new ExcelWriter
                {
                    _ms = ms,
                    _doc = doc,
                    FilePath = null // из памяти – нет файла
                };
            }
            doc?.Dispose();
        }
        catch { }

        ms?.Dispose();
        return null;
    }

    internal static ExcelWriter? CreateInternal(FileInfo sourceFile, string? destinationPath = null!)
    {
        if (sourceFile is null || !sourceFile.Exists) return null;

        var ms = new MemoryStream();
        try
        {
            using (var file = new FileStream(sourceFile.FullName,
                FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete))
            {
                file.CopyTo(ms);
            }
            ms.Position = 0;

            var doc = SpreadsheetDocument.Open(ms, isEditable: true,
                new OpenSettings { AutoSave = false });

            if (doc is not null)
            {
                return new ExcelWriter
                {
                    _ms = ms,
                    _doc = doc,
                    _originalSourcePath = sourceFile.FullName,
                    FilePath = destinationPath
                };
            }
            doc?.Dispose();
        }
        catch { }

        ms?.Dispose();
        return null;
    }

    /// <summary>
    /// Создаёт новый пустой документ Excel с одним листом.
    /// </summary>
    /// <param name="destinationPath">Путь, по которому будет сохранён документ (необязательный).</param>
    /// <returns>Экземпляр <see cref="ExcelWriter"/> для редактирования нового документа.</returns>
    internal static ExcelWriter CreateNew(string? destinationPath = null)
    {
        var ms = new MemoryStream();
        try
        {
            var doc = SpreadsheetDocument.Create(ms, SpreadsheetDocumentType.Workbook);
            var workbookPart = doc.AddWorkbookPart();
            workbookPart.Workbook = new Workbook();

            var worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
            worksheetPart.Worksheet = new Worksheet(new SheetData());

            var sheets = workbookPart.Workbook.AppendChild(new Sheets());
            //sheets.AppendChild(new Sheet()
            //{
            //    Id = workbookPart.GetIdOfPart(worksheetPart),
            //    SheetId = 1,
            //    Name = "Лист1"
            //});

            return new ExcelWriter
            {
                _ms = ms,
                _doc = doc,
                FilePath = destinationPath,
                _originalSourcePath = null
            };
        }
        catch
        {
            ms.Dispose();
            throw;
        }
    }

    #endregion

    #region Properties

    /// <summary>
    /// Получает значение, указывающее, будет ли документ сохранен с перезаписью исходного файла.
    /// </summary>
    public bool WillOverwriteSource => FilePath == _originalSourcePath;

    #endregion

    #region Replace

    // string

    void IExcelWriter.Replace(string oldValue, string newValue, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(oldValue))
            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));

        if (string.IsNullOrEmpty(newValue)) return;

        lock (_syncLock)
        {
            _doc.Replace(oldValue, newValue, comparisonType);
            _isModified = true;
        }
    }

    void IExcelWriter.Replace(IDictionary<string, string> replacements, StringComparison comparisonType) =>
        ((IExcelWriter)this).Replace((IEnumerable<KeyValuePair<string, string>>)replacements, comparisonType);
    void IExcelWriter.Replace(IEnumerable<KeyValuePair<string, string>> replacements, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (replacements is null) return;

        lock (_syncLock)
        {
            _doc.Replace(replacements, comparisonType);
            _isModified = true;
        }
    }


    // double

    void IExcelWriter.Replace(string oldValue, double newValue, string? format, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(oldValue))
            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));

        lock (_syncLock)
        {
            _doc.Replace(oldValue, newValue, format);
            _isModified = true;
        }
    }

    void IExcelWriter.Replace(IDictionary<string, double> replacements, string? format, StringComparison comparisonType) =>
        ((IExcelWriter)this).Replace((IEnumerable<KeyValuePair<string, double>>)replacements, format, comparisonType);
    void IExcelWriter.Replace(IEnumerable<KeyValuePair<string, double>> replacements, string? format, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (replacements == null) return;

        lock (_syncLock)
        {
            _doc.Replace(replacements, format, comparisonType);
            _isModified = true;
        }
    }


    // float

    void IExcelWriter.Replace(string oldValue, float newValue, string? format, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(oldValue))
            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));

        lock (_syncLock)
        {
            _doc.Replace(oldValue, newValue, format);
            _isModified = true;
        }
    }

    void IExcelWriter.Replace(IDictionary<string, float> replacements, string? format, StringComparison comparisonType) =>
        ((IExcelWriter)this).Replace((IEnumerable<KeyValuePair<string, float>>)replacements, format, comparisonType);
    void IExcelWriter.Replace(IEnumerable<KeyValuePair<string, float>> replacements, string? format, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (replacements == null) return;

        lock (_syncLock)
        {
            _doc.Replace(replacements, format, comparisonType);
            _isModified = true;
        }
    }


    // int

    void IExcelWriter.Replace(string oldValue, int newValue, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(oldValue))
            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));

        lock (_syncLock)
        {
            _doc.Replace(oldValue, newValue);
            _isModified = true;
        }
    }

    void IExcelWriter.Replace(IDictionary<string, int> replacements, StringComparison comparisonType) =>
        ((IExcelWriter)this).Replace((IEnumerable<KeyValuePair<string, int>>)replacements, comparisonType);
    void IExcelWriter.Replace(IEnumerable<KeyValuePair<string, int>> replacements, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (replacements == null) return;

        lock (_syncLock)
        {
            _doc.Replace(replacements, comparisonType);
            _isModified = true;
        }
    }


    // long

    void IExcelWriter.Replace(string oldValue, long newValue, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(oldValue))
            throw new ArgumentException("Old value cannot be null or empty", nameof(oldValue));

        lock (_syncLock)
        {
            _doc.Replace(oldValue, newValue);
            _isModified = true;
        }
    }

    void IExcelWriter.Replace(IDictionary<string, long> replacements, StringComparison comparisonType) =>
        ((IExcelWriter)this).Replace((IEnumerable<KeyValuePair<string, long>>)replacements, comparisonType);
    void IExcelWriter.Replace(IEnumerable<KeyValuePair<string, long>> replacements, StringComparison comparisonType)
    {
        ThrowIfDisposed();

        if (replacements == null) return;

        lock (_syncLock)
        {
            _doc.Replace(replacements, comparisonType);
            _isModified = true;
        }
    }

    #endregion

    #region Save Operations

    /// <summary>
    /// Сохраняет документ в файл, указанный при создании процессора.
    /// </summary>
    public void Save()
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(FilePath))
            throw new InvalidOperationException("Cannot save - no file path specified");

        SaveTo(FilePath!);
    }

    /// <summary>
    /// Сохраняет документ в указанный файл.
    /// </summary>
    public void SaveTo(string path)
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(path))
            throw new ArgumentException("Path cannot be null or empty", nameof(path));

        lock (_syncLock)
        {
            try
            {
                if (_ms is not null)
                {
                    EnsureFullCalculationOnLoad();
                    _doc.Save();
                    _ms.Position = 0;

                    using var fileStream = new FileStream(
                        path,
                        FileMode.Create,
                        FileAccess.Write,
                        FileShare.None,
                        bufferSize: 65536);

                    _ms.CopyTo(fileStream);
                    _isModified = false;
                }
            }
            catch (Exception ex)
            {
                throw new IOException($"Failed to save document to '{path}'", ex);
            }
        }
    }
    internal byte[] GetDocumentBytes()
    {
        lock (_syncLock)
        {
            EnsureFullCalculationOnLoad();
            _doc.Save();
            _ms.Position = 0;
            return _ms.ToArray();
        }
    }

    public void SaveTo(Stream outputStream)
    {
        lock (_syncLock)
        {
            EnsureFullCalculationOnLoad();
            _doc.Save();
            _ms.Position = 0;
            _ms.CopyTo(outputStream);
        }
    }

    /// <summary>
    /// Пытается сохранить документ в указанный файл.
    /// </summary>
    public bool TrySaveTo(string path, out Exception? error)
    {
        error = null;

        if (!IsValid || string.IsNullOrEmpty(path))
        {
            error = new InvalidOperationException("Processor is not valid or path is empty");
            return false;
        }

        try
        {
            SaveTo(path);
            return true;
        }
        catch (Exception ex)
        {
            error = ex;
#if DEBUG
            Debug.WriteLine($"[DEBUG] Failed to save to '{path}': {ex.Message}");
#endif
            return false;
        }
    }

    /// <summary>
    /// Асинхронно сохраняет документ в указанный файл.
    /// </summary>
    public async Task SaveToAsync(string path, CancellationToken cancellationToken = default)
    {
        ThrowIfDisposed();

        if (string.IsNullOrEmpty(path))
            throw new ArgumentException("Path cannot be null or empty", nameof(path));

        if (_ms is null)
            throw new InvalidOperationException("Memory stream is not available");

        byte[] buffer;
        lock (_syncLock)
        {
            EnsureFullCalculationOnLoad();
            _doc.Save();
            _ms.Position = 0;
            buffer = _ms.ToArray();
        }

        using var fileStream = new FileStream(
            path,
            FileMode.Create,
            FileAccess.Write,
            FileShare.None,
            bufferSize: 81920,
            useAsync: true);

        await fileStream.WriteAsync(buffer, 0, buffer.Length, cancellationToken);
    }

    /// <summary> Создаёт read-only процессор из текущего документа. </summary>
    internal ExcelReader ToReader()
    {
        lock (_syncLock)
        {
            EnsureFullCalculationOnLoad(); // важно для формул
            _doc.Save();
            _ms.Position = 0;
            var data = _ms.ToArray();
            return ExcelReader.CreateFromData(data)
                ?? throw new InvalidOperationException("Failed to create reader from the current document");
        }
    }

    #endregion

    #region Dispose Pattern

    protected override void Dispose(bool disposing)
    {
        if (_disposed)
            return;

        lock (_syncLock)
        {
            if (disposing)
            {
                if (_isModified && !string.IsNullOrEmpty(FilePath))
                {
                    try
                    {
                        EnsureFullCalculationOnLoad();
                        _doc.Save();

                        Directory.CreateDirectory(Path.GetDirectoryName(FilePath));

                        _ms.Position = 0;
                        using var fileStream = new FileStream(
                            FilePath!,
                            FileMode.Create,
                            FileAccess.Write,
                            FileShare.None,
                            bufferSize: 81920);

                        _ms.CopyTo(fileStream);
                    }
                    catch (Exception ex)
                    {
#if DEBUG
                        Debug.WriteLine($"[DEBUG] Auto-save failed during Dispose: {ex.Message}");
#endif
                    }
                }
            }

            base.Dispose(disposing);
        }
    }

    #endregion

    private void EnsureFullCalculationOnLoad()
    {
        if (_doc?.WorkbookPart?.Workbook == null) return;
        var workbook = _doc.WorkbookPart.Workbook;
        var calcProps = workbook.CalculationProperties;
        if (calcProps == null)
        {
            calcProps = new CalculationProperties();
            workbook.CalculationProperties = calcProps;
        }
        calcProps.ForceFullCalculation = true;
        calcProps.FullCalculationOnLoad = true;
    }


    #region IBook Implementation

    /// <inheritdoc />
    public IReadOnlyList<ISheet> GetSheets()
    {
        ThrowIfDisposed();
        lock (_syncLock)
        {
            var sheets = new List<ISheet>();
            var workbookPart = _doc.WorkbookPart;
            if (workbookPart?.Workbook?.Sheets == null)
                return sheets;

            foreach (Sheet sheetElement in workbookPart.Workbook.Sheets.Elements<Sheet>())
            {
                var sheet = new ExcelSheet(this, sheetElement, sheetElement.SheetId?.Value ?? 0);
                sheets.Add(sheet);
            }
            return sheets;
        }
    }

    /// <inheritdoc />
    public ISheet? Sheet(string name)
    {
        ThrowIfDisposed();
        if (string.IsNullOrEmpty(name))
            return null;

        lock (_syncLock)
        {
            var workbookPart = _doc.WorkbookPart;
            if (workbookPart?.Workbook?.Sheets == null)
                return null;

            foreach (Sheet sheetElement in workbookPart.Workbook.Sheets.Elements<Sheet>())
            {
                if (sheetElement.Name?.Value == name)
                    return new ExcelSheet(this, sheetElement, sheetElement.SheetId?.Value ?? 0);
            }
            return null;
        }
    }

    /// <inheritdoc />
    public bool TryGetSheet(string name, out ISheet sheet)
    {
        sheet = Sheet(name)!;
        return sheet != null;
    }

    /// <inheritdoc />
    public bool TryAddSheet(string name, Action<ISheet>? edit)
    {
        ThrowIfDisposed();
        if (string.IsNullOrEmpty(name))
            return false;

        lock (_syncLock)
        {
            var workbookPart = _doc.WorkbookPart;
            if (workbookPart?.Workbook?.Sheets == null)
                return false;

            // Проверка уникальности имени
            foreach (Sheet s in workbookPart.Workbook.Sheets.Elements<Sheet>())
            {
                if (s.Name?.Value == name)
                    return false;
            }

            // Создание нового листа
            var worksheetPart = workbookPart.AddNewPart<WorksheetPart>();
            worksheetPart.Worksheet = new Worksheet(new SheetData());

            // Вычисление нового SheetId
            uint maxSheetId = 0;
            foreach (Sheet s in workbookPart.Workbook.Sheets.Elements<Sheet>())
            {
                if (s.SheetId?.Value > maxSheetId)
                    maxSheetId = s.SheetId.Value;
            }
            uint newSheetId = maxSheetId + 1;

            var sheetElement = new Sheet
            {
                Id = workbookPart.GetIdOfPart(worksheetPart),
                SheetId = newSheetId,
                Name = name
            };
            workbookPart.Workbook.Sheets.Append(sheetElement);
            _isModified = true;

            var newSheet = new ExcelSheet(this, sheetElement, newSheetId);
            edit?.Invoke(newSheet);
            return true;
        }
    }

    /// <inheritdoc />
    public bool TryRemoveSheet(string name)
    {
        var sheet = Sheet(name);
        return sheet != null && TryRemoveSheet(sheet);
    }

    /// <inheritdoc />
    public bool TryRemoveSheet(ISheet sheet)
    {
        ThrowIfDisposed();
        if (sheet is not ExcelSheet xSheet || xSheet.Book != this)
            return false;

        lock (_syncLock)
        {
            var workbookPart = _doc.WorkbookPart;
            if (workbookPart?.Workbook?.Sheets == null)
                return false;

            var sheetElement = xSheet.SheetElement;
            if (sheetElement?.Parent != workbookPart.Workbook.Sheets)
                return false;

            // Удаление связанной части
            string partId = sheetElement.Id?.Value!;
            if (!string.IsNullOrEmpty(partId))
            {
                var part = workbookPart.GetPartById(partId);
                if (part != null)
                    workbookPart.DeletePart(part);
            }

            sheetElement.Remove();
            _isModified = true;
            return true;
        }
    }

    #endregion

    #region IExcelWriter

    /// <inheritdoc />
    public void Edit(Action<IBook> edit)
    {
        ThrowIfDisposed();
        if (edit is null)
            throw new ArgumentNullException(nameof(edit));

        lock (_syncLock)
        {
            edit(this);
            _isModified = true;
        }
    }

    #endregion


    // Добавить в класс ExcelWriter

    internal CellAlign GetCellAlign(uint styleIndex)
    {
        var cellFormat = GetCellFormatAt(styleIndex);
        return CellAlign.FromAlignment(cellFormat?.Alignment);
    }

    internal CellBorder GetCellBorder(uint styleIndex)
    {
        var cellFormat = GetCellFormatAt(styleIndex);
        if (cellFormat?.BorderId?.Value is not uint borderId)
            return default;
        var borderElement = GetBorderById(borderId);
        return CellBorder.FromBorder(borderElement);
    }

    internal CellFill GetCellFill(uint styleIndex)
    {
        var cellFormat = GetCellFormatAt(styleIndex);
        if (cellFormat?.FillId?.Value is not uint fillId)
            return default;
        var fill = GetFillById(fillId);
        return CellFill.FromFill(fill);
    }

    internal CellFont GetCellFont(uint styleIndex)
    {
        var cellFormat = GetCellFormatAt(styleIndex);
        if (cellFormat?.FontId?.Value is not uint fontId)
            return default;
        var font = GetFontById(fontId);
        return CellFont.FromFont(font);
    }


    // Внутренний метод, предполагает, что _syncLock уже захвачен вызывающим
    private NumberFormatPattern CreateNumberFormatInternal(string formatCode)
    {
        // Проверяем кэш по коду
        if (_numberFormatCache.TryGetValue(formatCode, out var existing))
            return existing;

        // Получаем или создаём NumberingFormat в стилях
        var stylesheet = EnsureStylesheet();
        var numberingFormats = stylesheet.NumberingFormats ?? CreateNumberingFormats(stylesheet);
        uint newId = 164;
        foreach (var nf in numberingFormats.Elements<NumberingFormat>())
        {
            if (nf.FormatCode?.Value == formatCode)
            {
                var pattern = new NumberFormatPattern(formatCode);
                pattern.Attach((ushort)nf.NumberFormatId!.Value);
                _numberFormatCache[formatCode] = pattern;
                return pattern;
            }
            if (nf.NumberFormatId?.Value >= newId)
                newId = nf.NumberFormatId.Value + 1;
        }

        var newNf = new NumberingFormat
        {
            NumberFormatId = newId,
            FormatCode = formatCode
        };
        numberingFormats.Append(newNf);
        numberingFormats.Count = (uint)numberingFormats.Elements<NumberingFormat>().Count();

        var result = new NumberFormatPattern(formatCode);
        result.Attach((ushort)newId);
        _numberFormatCache[formatCode] = result;
        return result;
    }


    // Вспомогательные методы для извлечения элементов из стилей (нужно закешировать или обращаться напрямую)

    private Border? GetBorderById(uint borderId)
    {
        if (_cachedBorders == null)
        {
            var borders = EnsureStylesheet().Borders;
            _cachedBorders = borders?.Elements<Border>().ToList() ?? [];
        }
        return borderId < _cachedBorders.Count ? _cachedBorders[(int)borderId] : null;
    }
    private List<Border>? _cachedBorders;

    private Fill? GetFillById(uint borderId)
    {
        if (_cachedFills == null)
        {
            var fills = EnsureStylesheet().Fills;
            _cachedFills = fills?.Elements<Fill>().ToList() ?? [];
        }
        return borderId < _cachedFills.Count ? _cachedFills[(int)borderId] : null;
    }
    private List<Fill>? _cachedFills;

    private Font? GetFontById(uint borderId)
    {
        if (_cachedFonts == null)
        {
            var borders = EnsureStylesheet().Borders;
            _cachedFonts = borders?.Elements<Font>().ToList() ?? [];
        }
        return borderId < _cachedFonts.Count ? _cachedFonts[(int)borderId] : null;
    }
    private List<Font>? _cachedFonts;
}