using BigRegister.Api.Data;
using BigRegister.Domain.Applications;
using BigRegister.Domain.Beoordeling;
using BigRegister.Domain.Diplomas;
using BigRegister.Domain.Documents;
using BigRegister.Domain.Registrations;
using BigRegister.Domain.Submissions;

namespace BigRegister.Tests;

public class DocumentRuleTests
{
  [Fact]
  public void Rejects_unknown_category() =>
      Assert.NotNull(DocumentRules.RejectUpload(null, "application/pdf", 1));

  [Fact]
  public void Rejects_disallowed_type()
  {
    var c = DocumentRules.Find("registratie", "diploma");
    Assert.NotNull(DocumentRules.RejectUpload(c, "text/plain", 1));
  }

  [Fact]
  public void Rejects_oversized_file()
  {
    var c = DocumentRules.Find("registratie", "diploma");
    Assert.NotNull(DocumentRules.RejectUpload(c, "application/pdf", 11L * 1024 * 1024));
  }

  [Fact]
  public void Accepts_valid_file()
  {
    var c = DocumentRules.Find("registratie", "diploma");
    Assert.Null(DocumentRules.RejectUpload(c, "application/pdf", 5L * 1024 * 1024));
  }

  private static IReadOnlyList<string> Ids(string? herkomst, string? taalvaardigheid) =>
      DocumentRules.CategoriesFor("registratie", herkomst, taalvaardigheid).Select(c => c.CategoryId).ToList();

  [Fact]
  public void First_load_has_no_diploma_upload() => // no diploma chosen yet
      Assert.Equal(new[] { "identiteit" }, Ids(null, null));

  [Fact]
  public void Manual_diploma_needs_a_diploma_upload() =>
      Assert.Equal(new[] { "diploma", "identiteit" }, Ids("handmatig", null));

  [Fact]
  public void Duo_diploma_skips_diploma_upload() =>
      Assert.DoesNotContain("diploma", Ids("duo", null));

  [Fact]
  public void Confirmed_dutch_proficiency_requires_taalvaardigheid_proof() =>
      Assert.Contains("taalvaardigheid", Ids("handmatig", "ja"));

  [Fact]
  public void Unconfirmed_proficiency_requires_no_taalvaardigheid_proof() =>
      Assert.DoesNotContain("taalvaardigheid", Ids("handmatig", "nee"));

  [Fact]
  public void Find_resolves_taalvaardigheid_for_upload_validation() =>
      Assert.NotNull(DocumentRules.Find("registratie", "taalvaardigheid"));
}

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)));
  }
}

public class DiplomaRuleTests
{
  private static Diploma Diploma(string opleiding, bool engelstalig) =>
      new("x", "naam", "instelling", 2011, opleiding, engelstalig);

  [Theory]
  [InlineData("geneeskunde", "Arts")]
  [InlineData("verpleegkunde", "Verpleegkundige")]
  [InlineData("onbekend-programma", "Onbekend")]
  public void Profession_is_derived_from_program(string opleiding, string expected) =>
      Assert.Equal(expected, DiplomaRules.ProfessionFor(Diploma(opleiding, false)));

  [Fact]
  public void English_diploma_requires_dutch_proficiency()
  {
    var questions = DiplomaRules.QuestionsFor(Diploma("geneeskunde", engelstalig: true));
    Assert.Single(questions);
    Assert.Equal("nl-taalvaardigheid", questions[0].Id);
  }

  [Fact]
  public void Dutch_diploma_has_no_policy_questions() =>
      Assert.Empty(DiplomaRules.QuestionsFor(Diploma("geneeskunde", engelstalig: false)));

  [Fact]
  public void Manual_diploma_gets_maximal_set()
  {
    var questions = DiplomaRules.ManualQuestions();
    Assert.Equal(3, questions.Count);
    Assert.Equal(new[] { "nl-taalvaardigheid", "diploma-erkend", "toelichting" },
        questions.Select(q => q.Id));
  }

  [Fact]
  public void Manual_professions_match_known_programs() =>
      Assert.Equal(new[] { "Arts", "Verpleegkundige", "Fysiotherapeut", "Apotheker", "Tandarts" },
          DiplomaRules.ManualProfessions());
}

public class SubmissionRuleTests
{
  [Fact]
  public void Manual_diploma_is_rejected() =>
      Assert.NotNull(SubmissionRules.RejectRegistratie("handmatig"));

  [Fact]
  public void Duo_diploma_is_accepted() =>
      Assert.Null(SubmissionRules.RejectRegistratie("duo"));

  [Fact]
  public void Zero_hours_is_rejected() =>
      Assert.NotNull(SubmissionRules.RejectZeroUren(0));

  [Fact]
  public void Worked_hours_are_accepted() =>
      Assert.Null(SubmissionRules.RejectZeroUren(40));

  [Theory]
  [InlineData("0612345678", null)]              // valid mobile
  [InlineData("070 123 45 67", null)]           // valid landline, formatting stripped
  [InlineData("nope", "Voer een geldig telefoonnummer in, bijv. 0612345678.")]
  [InlineData("12345", "Voer een geldig telefoonnummer in, bijv. 0612345678.")]
  public void Phone_change_is_validated(string telefoon, string? expected) =>
      Assert.Equal(expected, SubmissionRules.RejectPhoneChange(telefoon));
}

public class BeoordelingRuleTests
{
  [Theory]
  [InlineData(AanvraagStatusTag.Ingediend, true)]
  [InlineData(AanvraagStatusTag.InBehandeling, true)]
  [InlineData(AanvraagStatusTag.MeerInfoGevraagd, true)]
  [InlineData(AanvraagStatusTag.Goedgekeurd, false)]
  [InlineData(AanvraagStatusTag.Afgewezen, false)]
  public void Only_open_statuses_are_decidable(AanvraagStatusTag tag, bool expected) =>
      Assert.Equal(expected, BeoordelingRules.CanDecide(tag));

  // WP-68 (F6): the toelichting rule, moved here from an inline endpoint check.
  [Theory]
  [InlineData(Besluit.Goedkeuren, false)]
  [InlineData(Besluit.Afwijzen, true)]
  [InlineData(Besluit.MeerInfoOpvragen, true)]
  public void Only_a_non_approval_requires_a_toelichting(Besluit besluit, bool expected) =>
      Assert.Equal(expected, BeoordelingRules.RequiresToelichting(besluit));

  // WP-68 (T3): the transition table at the AGGREGATE level, not just against a bare tag —
  // an Aanvraag whose BesluitStatus already records a terminal decision computes a terminal
  // StatusAt, and CanDecide refuses a further besluit regardless of which one. Pins the
  // domain statement "Afgewezen/Goedgekeurd → no further besluit" independent of the
  // endpoint's own (integration-level) Already_decided_case_rejects_a_further_besluit.
  private static Aanvraag Decided(Besluit besluit) => new()
  {
    Id = "x",
    Type = "registratie",
    Owner = "test",
    Submitted = true,
    Referentie = "BIG-2026-1",
    SubmittedAt = DateTimeOffset.UtcNow,
    CreatedAt = DateTimeOffset.UtcNow,
    UpdatedAt = DateTimeOffset.UtcNow,
    BesluitStatus = besluit,
    BesluitToelichting = besluit == Besluit.Goedkeuren ? null : "toelichting",
  };

  [Theory]
  [InlineData(Besluit.Goedkeuren)]
  [InlineData(Besluit.Afwijzen)]
  public void A_terminal_decision_refuses_any_further_besluit(Besluit recorded)
  {
    var now = DateTimeOffset.UtcNow;
    var tag = Decided(recorded).StatusAt(now).Tag!.Value;
    Assert.False(BeoordelingRules.CanDecide(tag));
  }

  [Fact]
  public void MeerInfoOpvragen_is_not_terminal_a_further_besluit_is_still_legal()
  {
    var now = DateTimeOffset.UtcNow;
    var tag = Decided(Besluit.MeerInfoOpvragen).StatusAt(now).Tag!.Value;
    Assert.True(BeoordelingRules.CanDecide(tag));
  }
}