journal/Journal.Core/Services/Lists/ListService.cs

using System.ComponentModel.DataAnnotations;
using Journal.Core.Dtos;
using Journal.Core.Models;
using Journal.Core.Repositories;

namespace Journal.Core.Services.Lists;

public class ListService(IListRepository repo) : IListService
{
    private readonly IListRepository _repo = repo ?? throw new ArgumentNullException(nameof(repo));

    private static ListDocumentDto Map(ListDocument d) => new(
        d.Id,
        d.Label,
        d.Content,
        d.CreatedAt,
        d.UpdatedAt
    );

    public List<ListDocumentDto> GetAll()
    {
        var items = _repo.GetAll();
        return [.. items.Select(Map)];
    }

    public ListDocumentDto? GetById(Guid id)
    {
        var d = _repo.GetById(id);
        return d is null ? null : Map(d);
    }

    public ListDocumentDto Create(CreateListDto dto)
    {
        ArgumentNullException.ThrowIfNull(dto);

        var ctx = new ValidationContext(dto);
        Validator.ValidateObject(dto, ctx, validateAllProperties: true);

        var doc = new ListDocument(dto.Label, dto.Content ?? "");
        _repo.Add(doc);
        return Map(doc);
    }

    public bool Update(Guid id, UpdateListDto dto)
    {
        ArgumentNullException.ThrowIfNull(dto);
        if (dto.Label is not null && string.IsNullOrWhiteSpace(dto.Label))
            throw new ValidationException("Label cannot be empty");

        return _repo.Update(id, dto.Label?.Trim(), dto.Content);
    }

    public bool Remove(Guid id) => _repo.Remove(id);
}