Check/MagicCarpetProject/MagicCarpetContracts/DataModels/TourHistoryDataModel.cs

using MagicCarpetContracts.Exceptions;
using MagicCarpetContracts.Extensions;
using MagicCarpetContracts.Infrastructure;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MagicCarpetContracts.DataModels;

public class TourHistoryDataModel(string tourId, double oldPrice) : IValidation
{
    private readonly TourDataModel? _tour;

    public string TourId { get; private set; } = tourId;

    public double OldPrice { get; private set; } = oldPrice;

    public DateTime ChangeDate { get; private set; } = DateTime.UtcNow;

    public string TourName => _tour?.TourName ?? string.Empty;

    public TourHistoryDataModel(string tourId, double oldPrice, DateTime changeDate, TourDataModel tour) : this(tourId, oldPrice)
    {
        ChangeDate = changeDate;
        _tour = tour;
    }

    public void Validate()
    {
        if (TourId.IsEmpty())
            throw new ValidationException("Field TourId is empty");

        if (!TourId.IsGuid())
            throw new ValidationException("The value in the field TourId is not a unique identifier");

        if (OldPrice <= 0)
            throw new ValidationException("Field OldPrice is less than or equal to 0");
    }
}