using FluentValidation;

public class FhirPatientUpsertRequestValidator : AbstractValidator<FhirPatientUpsertRequest>
{
    private static readonly HashSet<string> ValidGenders = new(StringComparer.OrdinalIgnoreCase)
        { "male", "female", "other", "unknown" };

    public FhirPatientUpsertRequestValidator()
    {
        RuleFor(x => x.IdentifierSystem).NotEmpty().MaximumLength(500);
        RuleFor(x => x.IdentifierValue).NotEmpty().MaximumLength(200);
        RuleFor(x => x.FirstName).NotEmpty().MaximumLength(100);
        RuleFor(x => x.LastName).NotEmpty().MaximumLength(100);
        RuleFor(x => x.DateOfBirth).NotEmpty()
            .LessThanOrEqualTo(DateOnly.FromDateTime(DateTime.UtcNow))
            .WithMessage("Date of birth cannot be in the future.");
        RuleFor(x => x.Gender).NotEmpty()
            .Must(g => ValidGenders.Contains(g))
            .WithMessage("Gender must be one of: male, female, other, unknown.");
        RuleFor(x => x.BloodType).IsInEnum()
            .When(x => x.BloodType is not null);
        RuleFor(x => x.EmergencyContactName).MaximumLength(200)
            .When(x => x.EmergencyContactName is not null);
        RuleFor(x => x.EmergencyContactPhone).MaximumLength(20)
            .When(x => x.EmergencyContactPhone is not null);
    }
}
