using System.Net;
using System.Net.Http.Json;
using BigRegister.Api.Contracts;
using BigRegister.Api.Data;
using BigRegister.Domain.Applications;
using BigRegister.Tests.Builders;
using Microsoft.AspNetCore.Mvc.Testing;

namespace BigRegister.Tests;

public class AanvraagTests(TestWebApplicationFactory factory) : IClassFixture<TestWebApplicationFactory>
{
  private readonly HttpClient _client = factory.CreateClient();

  private async Task<AanvraagDetailDto> Create(string type = "registratie")
  {
    // One Concept per type is now server-enforced, and these tests share one DB
    // (IClassFixture). Clear any leftover Concept so each test starts from a clean slate.
    var existing = await List();
    Assert.NotNull(existing);
    foreach (var s in existing.Where(x => x.Status.Tag == "Concept"))
      await _client.DeleteAsync($"/api/v1/aanvragen/{s.Id}");
    var res = await _client.PostAsJsonAsync("/api/v1/aanvragen", new { type });
    Assert.Equal(HttpStatusCode.Created, res.StatusCode);
    var created = await res.Content.ReadFromJsonAsync<AanvraagDetailDto>();
    Assert.NotNull(created);
    return created;
  }

  private Task<List<AanvraagSummaryDto>?> List() =>
      _client.GetFromJsonAsync<List<AanvraagSummaryDto>>("/api/v1/aanvragen");

  // --- Lifecycle over HTTP ---

  [Fact]
  public async Task Create_then_list_shows_a_concept_with_step_progress()
  {
    var a = await Create();
    await _client.PutAsJsonAsync($"/api/v1/aanvragen/{a.Id}",
        new { draft = new { beroep = "arts" }, stepIndex = 1, stepCount = 4 });

    var list = await List();
    Assert.NotNull(list);
    var mine = list.Single(x => x.Id == a.Id);
    Assert.Equal("Concept", mine.Status.Tag);
    Assert.Equal(1, mine.Status.StepIndex);
    Assert.Equal(4, mine.Status.StepCount);
  }

  [Fact]
  public async Task Draft_sync_is_readable_back_from_detail()
  {
    var a = await Create();
    await _client.PutAsJsonAsync($"/api/v1/aanvragen/{a.Id}",
        new { draft = new { beroep = "verpleegkundige" }, stepIndex = 2, stepCount = 4 });

    var detail = await _client.GetFromJsonAsync<AanvraagDetailDto>($"/api/v1/aanvragen/{a.Id}");
    Assert.NotNull(detail);
    Assert.NotNull(detail.Draft);
    Assert.Equal("verpleegkundige", detail.Draft.Value.GetProperty("beroep").GetString());
  }

  [Fact]
  public async Task Submit_duo_registratie_is_in_behandeling_and_auto()
  {
    var a = await Create("registratie");
    var res = await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit", new { diplomaHerkomst = "duo" });
    res.EnsureSuccessStatusCode();
    var body = (await res.Content.ReadFromJsonAsync<AanvraagIndienenResponse>())!;
    Assert.StartsWith("BIG-2026-", body.Referentie);
    Assert.Equal("InBehandeling", body.Status.Tag);
    Assert.False(body.Status.Manual);   // auto-approvable → not a manual case
  }

  [Fact]
  public async Task Submit_handmatig_registratie_succeeds_as_manual_case()
  {
    var a = await Create("registratie");
    var res = await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit", new { diplomaHerkomst = "handmatig" });
    res.EnsureSuccessStatusCode();   // no longer a 422
    var body = (await res.Content.ReadFromJsonAsync<AanvraagIndienenResponse>())!;
    Assert.Equal("InBehandeling", body.Status.Tag);
    Assert.True(body.Status.Manual);
  }

  [Fact]
  public async Task Submit_herregistratie_with_zero_uren_is_afgewezen()
  {
    var a = await Create("herregistratie");
    var res = await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit", new { uren = 0 });
    res.EnsureSuccessStatusCode();   // the submission is accepted...
    var body = (await res.Content.ReadFromJsonAsync<AanvraagIndienenResponse>())!;
    Assert.Equal("Afgewezen", body.Status.Tag);   // ...but resolves to rejected
    Assert.NotNull(body.Status.Reden);
  }

  [Fact]
  public async Task Submitting_twice_conflicts()
  {
    var a = await Create("registratie");
    (await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit", new { diplomaHerkomst = "duo" })).EnsureSuccessStatusCode();
    var again = await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit", new { diplomaHerkomst = "duo" });
    Assert.Equal(HttpStatusCode.Conflict, again.StatusCode);
  }

  // --- One Concept per case type (server-enforced) ---

  [Fact]
  public async Task Creating_a_second_concept_of_the_same_type_conflicts()
  {
    await Create("herregistratie");
    var dup = await _client.PostAsJsonAsync("/api/v1/aanvragen", new { type = "herregistratie" });
    Assert.Equal(HttpStatusCode.Conflict, dup.StatusCode);
  }

  [Fact]
  public async Task A_concept_of_a_different_type_is_allowed()
  {
    await Create("registratie");
    var other = await _client.PostAsJsonAsync("/api/v1/aanvragen", new { type = "herregistratie" });
    Assert.Equal(HttpStatusCode.Created, other.StatusCode);
  }

  [Fact]
  public async Task A_new_concept_is_allowed_once_the_previous_one_is_submitted()
  {
    var a = await Create("registratie");
    (await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit", new { diplomaHerkomst = "duo" })).EnsureSuccessStatusCode();
    var next = await _client.PostAsJsonAsync("/api/v1/aanvragen", new { type = "registratie" });
    Assert.Equal(HttpStatusCode.Created, next.StatusCode);
  }

  [Fact]
  public async Task Cancel_concept_removes_it()
  {
    var a = await Create();
    Assert.Equal(HttpStatusCode.NoContent, (await _client.DeleteAsync($"/api/v1/aanvragen/{a.Id}")).StatusCode);
    Assert.Equal(HttpStatusCode.NotFound, (await _client.GetAsync($"/api/v1/aanvragen/{a.Id}")).StatusCode);
  }

  [Fact]
  public async Task Cancel_submitted_aanvraag_conflicts()
  {
    var a = await Create("registratie");
    (await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit", new { diplomaHerkomst = "duo" })).EnsureSuccessStatusCode();
    Assert.Equal(HttpStatusCode.Conflict, (await _client.DeleteAsync($"/api/v1/aanvragen/{a.Id}")).StatusCode);
  }

  // --- Citizen-scoping — GET /aanvragen must never leak across identities. ---

  [Fact]
  public async Task Applications_are_scoped_to_the_caller_bsn()
  {
    var mine = await Create("intake");

    var createOther = new HttpRequestMessage(HttpMethod.Post, "/api/v1/aanvragen")
    {
      Content = JsonContent.Create(new { type = "intake" }),
      Headers = { { "X-Subject", "999888777" } },
    };
    var otherRes = await _client.SendAsync(createOther);
    Assert.Equal(HttpStatusCode.Created, otherRes.StatusCode);
    var other = (await otherRes.Content.ReadFromJsonAsync<AanvraagDetailDto>())!;

    try
    {
      var listOther = new HttpRequestMessage(HttpMethod.Get, "/api/v1/aanvragen") { Headers = { { "X-Subject", "999888777" } } };
      var theirCases = (await (await _client.SendAsync(listOther)).Content.ReadFromJsonAsync<List<AanvraagSummaryDto>>())!;
      Assert.Contains(theirCases, c => c.Id == other.Id);
      Assert.DoesNotContain(theirCases, c => c.Id == mine.Id);

      var myCases = (await List())!;
      Assert.Contains(myCases, c => c.Id == mine.Id);
      Assert.DoesNotContain(myCases, c => c.Id == other.Id);
    }
    finally
    {
      var deleteOther = new HttpRequestMessage(HttpMethod.Delete, $"/api/v1/aanvragen/{other.Id}") { Headers = { { "X-Subject", "999888777" } } };
      await _client.SendAsync(deleteOther);
      await _client.DeleteAsync($"/api/v1/aanvragen/{mine.Id}");
    }
  }

  // --- A citizen may only reference their own uploads — submit/draft-sync must
  // reject a foreign documentId rather than silently attaching it. ---

  private static async Task<UploadResponse> UploadAs(HttpClient client, string owner, string localId)
  {
    var content = new MultipartFormDataContent();
    var file = new ByteArrayContent(new byte[] { 1, 2, 3 });
    file.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
    content.Add(file, "file", "d.pdf");
    content.Add(new StringContent("diploma"), "categoryId");
    content.Add(new StringContent(localId), "localId");
    content.Add(new StringContent("registratie"), "wizardId");
    var req = new HttpRequestMessage(HttpMethod.Post, "/api/v1/uploads") { Content = content, Headers = { { "X-Subject", owner } } };
    var res = await client.SendAsync(req);
    Assert.Equal(HttpStatusCode.Created, res.StatusCode);
    return (await res.Content.ReadFromJsonAsync<UploadResponse>())!;
  }

  [Fact]
  public async Task Submitting_a_foreign_documentId_is_rejected_and_leaves_it_deletable_by_its_owner()
  {
    var foreignDoc = await UploadAs(_client, "999888777", Guid.NewGuid().ToString());
    var a = await Create("registratie");

    var res = await _client.PostAsJsonAsync($"/api/v1/aanvragen/{a.Id}/submit",
        new { diplomaHerkomst = "duo", documents = new[] { new { categoryId = "diploma", channel = "digital", documentId = foreignDoc.DocumentId } } });
    Assert.Equal(HttpStatusCode.BadRequest, res.StatusCode);

    // The rejected submit must not have flipped the foreign document's Linked flag — its
    // owner can still delete it.
    var deleteReq = new HttpRequestMessage(HttpMethod.Delete, $"/api/v1/uploads/{foreignDoc.DocumentId}") { Headers = { { "X-Subject", "999888777" } } };
    Assert.Equal(HttpStatusCode.NoContent, (await _client.SendAsync(deleteReq)).StatusCode);
  }

  [Fact]
  public async Task Draft_sync_with_a_foreign_documentId_is_rejected()
  {
    var foreignDoc = await UploadAs(_client, "999888777", Guid.NewGuid().ToString());
    var a = await Create("registratie");

    var res = await _client.PutAsJsonAsync($"/api/v1/aanvragen/{a.Id}",
        new { draft = new { }, stepIndex = 0, stepCount = 1, documentIds = new[] { foreignDoc.DocumentId } });
    Assert.Equal(HttpStatusCode.BadRequest, res.StatusCode);
  }

  // --- Auto-approval is computed on read: exercise the window boundary without waiting. ---

  private static Aanvraag.Submitted Accepted(bool autoApprovable) =>
      Given.Concept(type: "registratie", owner: "test").Submitted(autoApprovable).Build();

  [Fact]
  public void AutoApprovable_flips_to_goedgekeurd_after_the_window()
  {
    var a = Accepted(autoApprovable: true);
    var t0 = a.SubmittedAt;
    Assert.Equal("InBehandeling", a.ToStatusDto(t0 + ApplicationStore.ProcessingWindow - TimeSpan.FromSeconds(1)).Tag);
    Assert.Equal("Goedgekeurd", a.ToStatusDto(t0 + ApplicationStore.ProcessingWindow + TimeSpan.FromSeconds(1)).Tag);
  }

  [Fact]
  public void Manual_case_never_auto_advances()
  {
    var a = Accepted(autoApprovable: false);
    var far = a.SubmittedAt + ApplicationStore.ProcessingWindow + TimeSpan.FromDays(1);
    var status = a.ToStatusDto(far);
    Assert.Equal("InBehandeling", status.Tag);
    Assert.True(status.Manual);
  }
}