using System.ComponentModel.DataAnnotations;

namespace T120B165_ImgBoard.Dtos.Post;

public record CreatePostDto(string Title,
    [Required]
    string Description,
    [Required]
    List<string> Tags,
    [Required]
    string FileName,
    [Required]
    string FileMimeType,
    [Required]
    [Range(0, long.MaxValue, ErrorMessage = "The {0} must be a valid number and at least {1}.")]
    long? FileSize
);

public record EditPostDto(string? Title, string? Description, List<string>? Tags): IValidatableObject
{
    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        var allEmpty = string.IsNullOrWhiteSpace(Title) &&
                       string.IsNullOrWhiteSpace(Description) &&
                       Tags == null;
        if (allEmpty)
        {
            yield return new ValidationResult(
                "You must provide at least one value to edit: Title, Description, or Tags.",
                [nameof(Title), nameof(Description), nameof(Tags)]
            );
        }
    }
}