journal/Journal.Core/Models/Fragment.cs

namespace Journal.Core.Models;

public class Fragment
{
    public Guid Id { get; }
    public string Type { get; set; }
    public string Description { get; set; }
    public DateTimeOffset Time { get; set; }
    public List<string> Tags { get; set; } = [];

    public Fragment(string type, string description)
    {
        Validate(type, description);

        Id = Guid.NewGuid();
        Type = type.Trim();
        Description = description.Trim();
        Time = DateTimeOffset.Now;
    }

    public Fragment(Guid id, string type, string description, DateTimeOffset time, IEnumerable<string>? tags = null)
    {
        if (id == Guid.Empty)
            throw new ArgumentException("Id is required", nameof(id));
        Validate(type, description);

        Id = id;
        Type = type.Trim();
        Description = description.Trim();
        Time = time;
        if (tags is not null)
            Tags = [.. tags.Where(t => !string.IsNullOrWhiteSpace(t)).Select(t => t.Trim())];
    }

    private static void Validate(string type, string description)
    {
        if (string.IsNullOrWhiteSpace(type))
            throw new ArgumentException("Type is required", nameof(type));
        if (string.IsNullOrWhiteSpace(description))
            throw new ArgumentException("Description is required", nameof(description));
    }
}