LibraryApp/LibraryApp.Domain/Services/BookCountService.cs

using LibraryApp.Domain;
using LibraryApp.Domain.Entities;

namespace LibraryApp.Domain.Services;

public class BookCountService
{
    private readonly IBookCountReportPrinter _printer;

    public BookCountService(IBookCountReportPrinter printer)
    {
        _printer = printer;
    }

    public async Task<Result<BookCountReport>> PerformCountAsync(
        Shelf shelf,
        IReadOnlyList<BookInstanceBarcode> scannedBarcodes,
        IReadOnlyList<BookInstance> allInstancesOnShelf)
    {
        shelf.RecordCount();

        var report = new BookCountReport(shelf.Id, DateTime.UtcNow, allInstancesOnShelf, scannedBarcodes);

        foreach (var instance in report.MissingInstances)
            instance.MarkAsLost();

        await _printer.PrintAsync(report);

        return Result<BookCountReport>.Success(report);
    }
}