using System.Net;
using System.Net.Http.Json;
using BigRegister.Api.Contracts;
using BigRegister.Api.Data;
using BigRegister.Domain.Applications;
using BigRegister.Domain.Beoordeling;
using BigRegister.Tests.Builders;

namespace BigRegister.Tests.Acceptance;

/// <summary>
/// Behaviour-level tests for the besluit lifecycle, built through the
/// <see cref="Given"/> type-state builder rather than the full wizard/upload dance
/// <see cref="BeoordelingTests"/> uses — a fixture that's already Submitted (or already
/// Decided) is a two-line Given, not fifteen. Each test persists its own Given-built
/// <see cref="Aanvraag"/> straight into the isolated per-class SQLite file (no HTTP round trip
/// needed to create it) and exercises the real write path from there.
/// </summary>
public class BesluitLifecycleTests(TestWebApplicationFactory factory) : IClassFixture<TestWebApplicationFactory>
{
  // Booting the client (once, here) is what makes Db.ConnectionString point at THIS class's
  // throwaway file and runs its migrations — see TestWebApplicationFactory's own docs.
  private readonly HttpClient _client = factory.CreateClient();

  private static void Persist(Aanvraag aanvraag)
  {
    using var db = Db.Create();
    db.Applications.Add(aanvraag.ToEntity());
    db.SaveChanges();
  }

  [Fact]
  public void A_terminal_besluit_is_frozen()
  {
    // Given a case already decided Goedgekeurd — terminal, per BeoordelingRules.CanDecide.
    var aanvraag = Given.Concept(type: "registratie").Submitted().Decided(Besluit.Goedkeuren).Build();
    Persist(aanvraag);

    // When a behandelaar tries to record a further besluit on it...
    var (outcome, updated) = ApplicationStore.RecordBesluit(aanvraag.Id, Besluit.Afwijzen, "te laat", DateTimeOffset.UtcNow);

    // Then the write is refused, and the original decision still stands.
    Assert.Equal(ApplicationStore.RecordBesluitOutcome.Conflict, outcome);
    Assert.Null(updated);
    var stillGoedgekeurd = ApplicationStore.GetAny(aanvraag.Id)!.StatusAt(DateTimeOffset.UtcNow);
    Assert.Equal(AanvraagStatusTag.Goedgekeurd, stillGoedgekeurd.Tag);
  }

  [Fact]
  public void MeerInfoGevraagd_can_be_decided_again()
  {
    // Given a case a behandelaar sent back for more information — not terminal.
    var aanvraag = Given.Concept(type: "registratie").Submitted().Decided(Besluit.MeerInfoOpvragen, "stuur een geldig diploma").Build();
    Persist(aanvraag);

    // When a further besluit is recorded on it...
    var (outcome, updated) = ApplicationStore.RecordBesluit(aanvraag.Id, Besluit.Goedkeuren, null, DateTimeOffset.UtcNow);

    // Then, unlike a terminal decision, it succeeds and advances the status.
    Assert.Equal(ApplicationStore.RecordBesluitOutcome.Ok, outcome);
    Assert.Equal(AanvraagStatusTag.Goedgekeurd, updated!.StatusAt(DateTimeOffset.UtcNow).Tag);
  }

  [Fact]
  public void A_recorded_decision_wins_over_the_auto_approve_computation()
  {
    // Given an auto-approvable submission that a behandelaar decides (Afwijzen) before the
    // auto-approve window would otherwise have closed it as Goedgekeurd.
    var aanvraag = Given.Concept(type: "registratie").Submitted(autoApprovable: true).Build();
    Persist(aanvraag);
    var (outcome, _) = ApplicationStore.RecordBesluit(aanvraag.Id, Besluit.Afwijzen, "diploma niet erkend", DateTimeOffset.UtcNow);
    Assert.Equal(ApplicationStore.RecordBesluitOutcome.Ok, outcome);

    // When the status is read long after the auto-approve window has passed — the instant an
    // undecided auto-approvable case of the same shape WOULD read Goedgekeurd (see
    // ApplicationTests.AutoApprovable_flips_to_goedgekeurd_after_the_window)...
    var longAfterTheWindow = aanvraag.SubmittedAt + ApplicationStore.ProcessingWindow + TimeSpan.FromDays(1);
    var status = ApplicationStore.GetAny(aanvraag.Id)!.StatusAt(longAfterTheWindow);

    // Then the recorded decision still wins — Afgewezen, never Goedgekeurd.
    Assert.Equal(AanvraagStatusTag.Afgewezen, status.Tag);
  }

  private Task<HttpResponseMessage> PostBesluit(string id, object body)
  {
    var req = new HttpRequestMessage(HttpMethod.Post, $"/api/v1/beoordeling/{id}/besluit") { Content = JsonContent.Create(body) };
    req.Headers.Add("X-Medewerker", "medewerker-1");
    return _client.SendAsync(req);
  }

  [Fact]
  public async Task Afwijzen_requires_a_toelichting()
  {
    // Given an open, decidable case (no decision recorded yet).
    var aanvraag = Given.Concept(type: "registratie").Submitted().Build();
    Persist(aanvraag);

    // When a behandelaar posts Afwijzen with no toelichting...
    var missing = await PostBesluit(aanvraag.Id, new { besluit = "Afwijzen" });

    // Then the request is rejected — the wire boundary enforces the same rule
    // (BeoordelingRules.RequiresToelichting) the builder enforces for a built fixture.
    Assert.Equal(HttpStatusCode.BadRequest, missing.StatusCode);

    // And the identical request WITH a toelichting succeeds.
    var withToelichting = await PostBesluit(aanvraag.Id, new { besluit = "Afwijzen", toelichting = "Diploma niet erkend" });
    withToelichting.EnsureSuccessStatusCode();
    var body = (await withToelichting.Content.ReadFromJsonAsync<RecordBesluitResponse>())!;
    Assert.Equal("Afgewezen", body.Status.Tag);
  }
}