namespace QWERTYkez.ExcelProcessor;

/// <summary>
/// Внутренняя реализация <see cref="IBook"/>, которая делегирует вызовы к <see cref="ExcelWriter"/>.
/// Используется в ситуациях, когда требуется отдельный объект книги (например, в <see cref="IExcelWriter.Edit"/>).
/// </summary>
internal sealed class ExcelBook : IBook
{
    internal readonly ExcelWriter Writer;

    /// <summary>
    /// Инициализирует обёртку книги.
    /// </summary>
    /// <param name="writer">Реальный процессор Excel (реализует IBook).</param>
    internal ExcelBook(ExcelWriter writer)
    {
        Writer = writer;
    }

    /// <inheritdoc />
    public IReadOnlyList<ISheet> GetSheets() => Writer.GetSheets();

    /// <inheritdoc />
    public ISheet? Sheet(string name) => Writer.Sheet(name.EscapeSymbols());

    /// <inheritdoc />
    public bool TryGetSheet(string name, out ISheet sheet) => Writer.TryGetSheet(name.EscapeSymbols(), out sheet);

    /// <inheritdoc />
    public bool TryAddSheet(string name, Action<ISheet>? edit = null) => Writer.TryAddSheet(name.EscapeSymbols(), edit);

    /// <inheritdoc />
    public bool TryRemoveSheet(string name) => Writer.TryRemoveSheet(name.EscapeSymbols());

    /// <inheritdoc />
    public bool TryRemoveSheet(ISheet sheet) => Writer.TryRemoveSheet(sheet);

    /// <inheritdoc />
    public IReadOnlyList<NumberFormatPattern> GetNumberFormats() => Writer.GetNumberFormats();

    /// <inheritdoc />
    public NumberFormatPattern CreateNumberFormat(string format) => Writer.CreateNumberFormat(format);
}

public static class EscapeExt
{
    public static string EscapeSymbols(this string source)
    {
        var sb = new StringBuilder(source);

        sb.Replace('/', '∕');
        sb.Replace('\\', '∖');
        sb.Replace('*', '∗');
        sb.Replace('?', '？');
        sb.Replace(':', '˸');
        sb.Replace('[', '［');
        sb.Replace(']', '］');

        return sb.ToString();
    }
}