using BigRegister.Domain.Registrations;

namespace BigRegister.Tests.Domain;

public class HerregistratieRuleTests
{
  private static Registration Active(DateOnly deadline) => new(
      "19012345601", "Test", "Arts",
      new DateOnly(2012, 9, 1), new DateOnly(1985, 3, 14),
      new RegistrationStatus(StatusTag.Geregistreerd, HerregistratieDatum: deadline));

  [Fact]
  public void Eligible_within_window()
  {
    var (eligible, reason) = HerregistratieRule.Evaluate(
        Active(new DateOnly(2027, 3, 1)), today: new DateOnly(2026, 6, 26));
    Assert.True(eligible);
    Assert.Contains("12 maanden", reason);
  }

  [Fact]
  public void Not_eligible_before_window()
  {
    var (eligible, _) = HerregistratieRule.Evaluate(
        Active(new DateOnly(2027, 3, 1)), today: new DateOnly(2025, 1, 1));
    Assert.False(eligible);
  }

  [Fact]
  public void Eligible_on_window_boundary()
  {
    // window opens exactly 12 months before the deadline
    var (eligible, _) = HerregistratieRule.Evaluate(
        Active(new DateOnly(2027, 3, 1)), today: new DateOnly(2026, 3, 1));
    Assert.True(eligible);
  }

  [Fact]
  public void Suspended_is_not_eligible()
  {
    var reg = Active(new DateOnly(2027, 3, 1)) with
    {
      Status = new RegistrationStatus(StatusTag.Geschorst, GeschorstTot: new DateOnly(2027, 1, 1), Reden: "x"),
    };
    var (eligible, _) = HerregistratieRule.Evaluate(reg, today: new DateOnly(2026, 6, 26));
    Assert.False(eligible);
  }

  [Fact]
  public void Status_consistency_invariant()
  {
    Assert.True(HerregistratieRule.IsStatusConsistent(
        new RegistrationStatus(StatusTag.Geregistreerd, HerregistratieDatum: new DateOnly(2027, 3, 1))));
    Assert.False(HerregistratieRule.IsStatusConsistent(
        new RegistrationStatus(StatusTag.Geregistreerd)));
  }
}