import "fake-indexeddb/auto";
import { IDBFactory } from "fake-indexeddb";
import { openDB } from "idb";
import { beforeEach, describe, expect, it, vi, type MockedFunction } from "vitest";
import { readHandOvers, rememberHandOver } from "@/lib/photos/handover";

vi.mock("@/lib/inspections/api", () => ({ createInspection: vi.fn() }));
vi.mock("@/lib/treatments/api", () => ({ createTreatment: vi.fn() }));
vi.mock("@/lib/documents/api", () => ({ uploadDocument: vi.fn() }));
vi.mock("@/lib/phenology/api", () => ({ createPhenologyReport: vi.fn() }));
vi.mock("@/lib/hive/api", () => ({ postHiveChange: vi.fn() }));
vi.mock("@/lib/voice/api", () => ({ uploadVoiceCapture: vi.fn() }));
vi.mock("@/lib/apiaries/offline-pack", () => ({ refreshPacksAfterSync: vi.fn() }));

// What the inspection drain hands over to the photos, seen at that moment.
const photoHandOver = vi.hoisted(() => ({
  calls: [] as { key: string; inspectionId: string; entryStillQueued: boolean }[],
  failFor: null as string | null,
  // Set per test: reads the queue of the test's fresh database.
  isQueued: (() => Promise.resolve(false)) as (key: string) => Promise<boolean>,
}));
vi.mock("@/lib/photos/store", async (importOriginal) => {
  const actual = await importOriginal<typeof import("@/lib/photos/store")>();
  return {
    ...actual,
    resolveQueuedInspection: async (key: string, inspectionId: string) => {
      photoHandOver.calls.push({
        key,
        inspectionId,
        entryStillQueued: await photoHandOver.isQueued(key),
      });
      if (photoHandOver.failFor === key) {
        throw new Error("Speicher voll");
      }
      return actual.resolveQueuedInspection(key, inspectionId);
    },
  };
});

type OfflineDbModule = typeof import("./db");
type SyncModule = typeof import("./sync");
type PhotoStoreModule = typeof import("@/lib/photos/store");
type ApiErrorClass = typeof import("@/lib/auth/api-client").ApiError;

let db: OfflineDbModule;
let sync: SyncModule;
let photos: PhotoStoreModule;
let ApiError: ApiErrorClass;
let createInspection: MockedFunction<typeof import("@/lib/inspections/api").createInspection>;
let createTreatment: MockedFunction<typeof import("@/lib/treatments/api").createTreatment>;
let createPhenologyReport: MockedFunction<
  typeof import("@/lib/phenology/api").createPhenologyReport
>;
let uploadDocument: MockedFunction<typeof import("@/lib/documents/api").uploadDocument>;
let refreshPacksAfterSync: MockedFunction<
  typeof import("@/lib/apiaries/offline-pack").refreshPacksAfterSync
>;

function inspection(colony: number) {
  return { colonyId: `colony-${colony}`, date: "2026-10-01T00:00:00.000Z" };
}

/** A request that stays open until the test answers it. */
function openRequest() {
  let answer: (saved: { id: string }) => void = () => undefined;
  const promise = new Promise<{ id: string }>((resolve) => {
    answer = resolve;
  });
  return { promise: promise as never, answer };
}

/** Lets every already-runnable promise callback run. */
function settle(): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, 0));
}

function sentColonies(): string[] {
  return createInspection.mock.calls.map(([input]) => input.colonyId);
}

function takePhoto(sessionId: string) {
  return photos.addDraftPhoto({
    sessionId,
    ownerUserId: "user-1",
    blob: new Blob(["jpeg"], { type: "image/jpeg" }),
    date: "2026-10-01",
  });
}

describe("syncPendingEntries", () => {
  beforeEach(async () => {
    // A fresh database and fresh modules: nothing (no open connection, no
    // in-flight run) carries over from the previous test.
    globalThis.indexedDB = new IDBFactory();
    window.localStorage.clear();
    vi.resetModules();
    db = await import("./db");
    sync = await import("./sync");
    photos = await import("@/lib/photos/store");
    ApiError = (await import("@/lib/auth/api-client")).ApiError;
    createInspection = vi.mocked((await import("@/lib/inspections/api")).createInspection);
    createTreatment = vi.mocked((await import("@/lib/treatments/api")).createTreatment);
    uploadDocument = vi.mocked((await import("@/lib/documents/api")).uploadDocument);
    createPhenologyReport = vi.mocked(
      (await import("@/lib/phenology/api")).createPhenologyReport,
    );
    refreshPacksAfterSync = vi.mocked(
      (await import("@/lib/apiaries/offline-pack")).refreshPacksAfterSync,
    );
    // The mocks themselves outlive resetModules - start them from scratch too.
    createInspection.mockReset();
    createTreatment.mockReset();
    uploadDocument.mockReset();
    createPhenologyReport.mockReset();
    refreshPacksAfterSync.mockReset().mockResolvedValue(undefined);
    photoHandOver.calls.length = 0;
    photoHandOver.failFor = null;
    photoHandOver.isQueued = async (key) =>
      (await db.getPendingEntries("pending-inspections")).some(
        (entry) => entry.idempotencyKey === key,
      );
  });

  it("syncs every queued entry and removes it from the queue", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    await db.queueInspection(inspection(2), "key-2", "user-1");
    createInspection.mockResolvedValue({ id: "x" } as never);

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 2, failed: 0, skippedForeign: 0 });
    expect(await db.getPendingEntries("pending-inspections")).toEqual([]);
  });

  it("uploads recorded voice notes after the records, inside the run", async () => {
    const order: string[] = [];
    const { uploadVoiceCapture } = await import("@/lib/voice/api");
    vi.mocked(uploadVoiceCapture).mockReset().mockImplementation(async () => {
      order.push("voice");
      return { id: "cap-1", status: "QUEUED" as const };
    });
    createInspection.mockImplementation(async () => {
      order.push("inspection");
      return { id: "x" } as never;
    });
    await db.queueInspection(inspection(1), "key-1", "user-1");
    const raw = await openDB("apicore-offline");
    await raw.put("pending-voice", {
      id: "v1",
      ownerUserId: "user-1",
      blob: new Blob(["audio"]),
      mime: "audio/webm",
      durationSec: 20,
      colonyId: "colony-1",
      inspectionDate: "2026-10-16",
      createdAt: "2026-10-16T08:00:00.000Z",
      uploadIdempotencyKey: "upload-v1",
      state: "recorded",
    });
    raw.close();

    const result = await sync.syncPendingEntries("user-1");

    expect(order).toEqual(["inspection", "voice"]);
    expect(result).toEqual({ synced: 2, failed: 0, skippedForeign: 0 });
  });

  it("a cancelled run sends no voice note", async () => {
    const { uploadVoiceCapture } = await import("@/lib/voice/api");
    vi.mocked(uploadVoiceCapture).mockReset();
    await db.getPendingEntries("pending-inspections");
    const raw = await openDB("apicore-offline");
    await raw.put("pending-voice", {
      id: "v1",
      ownerUserId: "user-1",
      blob: new Blob(["audio"]),
      mime: "audio/webm",
      durationSec: 20,
      colonyId: "colony-1",
      inspectionDate: "2026-10-16",
      createdAt: "2026-10-16T08:00:00.000Z",
      uploadIdempotencyKey: "upload-v1",
      state: "recorded",
    });
    raw.close();

    const run = sync.syncPendingEntries("user-1");
    await sync.cancelSync();
    await run;
    sync.resumeSync();

    expect(uploadVoiceCapture).not.toHaveBeenCalled();
  });

  it("offline the plant report is queued and synced later with its key", async () => {
    const report = {
      phase: "SALWEIDE",
      date: "2026-03-20",
      apiaryId: null,
    } as const;
    await db.queuePhenologyReport(report, "plant-key-0000000001", "user-1");
    createPhenologyReport.mockResolvedValue({ id: "r-1" } as never);

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(createPhenologyReport).toHaveBeenCalledWith(report, {
      idempotencyKey: "plant-key-0000000001",
    });
    expect(await db.getPendingEntries("pending-phenology-reports")).toEqual([]);
  });

  it("skips a plant report of another account", async () => {
    await db.queuePhenologyReport(
      { phase: "SALWEIDE", date: "2026-03-20" },
      "plant-key-0000000004",
      "user-2",
    );

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 0, failed: 0, skippedForeign: 1 });
    expect(createPhenologyReport).not.toHaveBeenCalled();
    expect(await db.getPendingEntries("pending-phenology-reports")).toHaveLength(1);
  });

  it("keeps a plant report the server rejected, with the reason", async () => {
    await db.queuePhenologyReport(
      { phase: "KIRSCHE", date: "2026-04-02" },
      "plant-key-0000000002",
      "user-1",
    );
    createPhenologyReport.mockRejectedValue(
      new ApiError(400, "Das Datum liegt in der Zukunft.", {}),
    );

    const result = await sync.syncPendingEntries("user-1");

    expect(result.failed).toBe(1);
    const [entry] = await db.getPendingEntries("pending-phenology-reports");
    expect(entry.lastError?.message).toBe("Das Datum liegt in der Zukunft.");
  });

  it("resends a queued entry with the idempotency key it was queued with", async () => {
    // The server may already have saved the first attempt; the same key lets
    // it answer with that record instead of storing a duplicate.
    await db.queueInspection(inspection(1), "key-from-the-form-0001", "user-1");
    createInspection.mockResolvedValue({ id: "x" } as never);

    await sync.syncPendingEntries("user-1");

    expect(createInspection).toHaveBeenCalledWith(inspection(1), {
      idempotencyKey: "key-from-the-form-0001",
    });
  });

  it("sends an inspection queued by the previous version with its legacy feed word unchanged", async () => {
    // The server maps ausreichend/niedrig/kritisch itself; the queue must not rewrite or reject them.
    const legacy = { ...inspection(1), feedStatus: "niedrig" } as never;
    await db.queueInspection(legacy, "key-legacy-feed-0001", "user-1");
    createInspection.mockResolvedValue({ id: "x" } as never);

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(createInspection).toHaveBeenCalledWith(
      expect.objectContaining({ feedStatus: "niedrig" }),
      { idempotencyKey: "key-legacy-feed-0001" },
    );
  });

  it("sends the Volkskarte fields of a queued inspection along", async () => {
    const queued = { ...inspection(1), feedStatus: "WEAK", applyToColony: ["feedStatus"] } as never;
    await db.queueInspection(queued, "key-takeover-0001", "user-1");
    createInspection.mockResolvedValue({ id: "x" } as never);

    await sync.syncPendingEntries("user-1");

    expect(createInspection).toHaveBeenCalledWith(
      expect.objectContaining({ feedStatus: "WEAK", applyToColony: ["feedStatus"] }),
      { idempotencyKey: "key-takeover-0001" },
    );
  });

  it("still sends entries queued before keys and owners existed", async () => {
    await db.summarizeQueue("user-1"); // creates the database at the current version
    const raw = await openDB("apicore-offline");
    await raw.add("pending-inspections", {
      input: inspection(1),
      queuedAt: "2026-10-01T08:00:00.000Z",
    });
    raw.close();
    createInspection.mockResolvedValue({ id: "x" } as never);

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(createInspection).toHaveBeenCalledWith(inspection(1), { idempotencyKey: undefined });
  });

  it("stores the server rejection on the entry and keeps it", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    const body = { statusCode: 400, message: "Volk V-03 ist beendet." };
    createInspection.mockRejectedValue(new ApiError(400, "Volk V-03 ist beendet.", body));

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 0, failed: 1, skippedForeign: 0 });
    const [kept] = await db.getPendingEntries("pending-inspections");
    expect(kept.idempotencyKey).toBe("key-1");
    expect(kept.lastError).toEqual({
      status: 400,
      message: "Volk V-03 ist beendet.",
      details: body,
      at: expect.any(String),
    });
    expect(kept.lastError?.status).toBe(400);
  });

  it("an inspection for a colony ended since the pack was loaded stays queued with the server message and the packs are refreshed", async () => {
    // Review Focus 1: the pack still listed V-03 as living when the
    // inspection was recorded offline; the server knows better.
    await db.queueInspection(inspection(3), "key-3", "user-1");
    const body = { statusCode: 400, message: "Volk V-03 ist beendet." };
    createInspection.mockRejectedValue(new ApiError(400, "Volk V-03 ist beendet.", body));

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 0, failed: 1, skippedForeign: 0 });
    const [kept] = await db.getPendingEntries("pending-inspections");
    expect(kept.lastError?.message).toBe("Volk V-03 ist beendet.");
    expect(kept.lastError?.status).toBe(400);
    // The packs holding V-03 are reloaded at once, not only after 1 h.
    expect(refreshPacksAfterSync).toHaveBeenCalledTimes(1);
    expect(refreshPacksAfterSync).toHaveBeenCalledWith(
      "user-1",
      expect.any(Number),
      expect.any(Function),
      { force: true, colonyIds: ["colony-3"] },
    );
  });

  it("refreshes the packs by age only when nothing was rejected", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    createInspection.mockResolvedValue({ id: "x" } as never);

    await sync.syncPendingEntries("user-1");

    expect(refreshPacksAfterSync).toHaveBeenCalledTimes(1);
    expect(refreshPacksAfterSync.mock.calls[0]).toHaveLength(3);
  });

  it("does not force a pack reload after a network failure", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    createInspection.mockRejectedValue(new TypeError("Failed to fetch"));

    await sync.syncPendingEntries("user-1");

    expect(refreshPacksAfterSync.mock.calls[0]).toHaveLength(3);
  });

  it("forces the reload for the colonies of every rejected entry, each once", async () => {
    await db.queueInspection(inspection(3), "key-3", "user-1");
    await db.queueInspection(inspection(3), "key-3b", "user-1");
    await db.queueTreatment(
      { colonyId: "colony-5", date: "2026-10-01T00:00:00.000Z", product: "Oxuvar" },
      "key-t",
      "user-1",
    );
    createInspection.mockRejectedValue(new ApiError(400, "Volk V-03 ist beendet."));
    createTreatment.mockRejectedValue(new ApiError(400, "Volk V-05 ist beendet."));

    await sync.syncPendingEntries("user-1");

    const options = refreshPacksAfterSync.mock.calls[0][3];
    expect(options?.force).toBe(true);
    expect([...(options?.colonyIds ?? [])].sort()).toEqual(["colony-3", "colony-5"]);
  });

  it("refreshes the packs only for the run's user and never after cancelSync()", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    const request = openRequest();
    createInspection.mockReturnValueOnce(request.promise);

    const run = sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(createInspection).toHaveBeenCalledTimes(1));
    const cancelled = sync.cancelSync();
    request.answer({ id: "server-1" });
    await run;
    await cancelled;

    expect(refreshPacksAfterSync).not.toHaveBeenCalled();
  });

  it("continues with the rest of the queue after a server rejection", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    await db.queueInspection(inspection(2), "key-2", "user-1");
    createInspection
      .mockRejectedValueOnce(new ApiError(400, "invalid colony"))
      .mockResolvedValueOnce({ id: "x" } as never);

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 1, failed: 1, skippedForeign: 0 });
    const remaining = await db.getPendingEntries("pending-inspections");
    expect(remaining.map((entry) => entry.idempotencyKey)).toEqual(["key-1"]);
  });

  it("stops immediately on a network failure, leaving the rest queued untouched", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    await db.queueInspection(inspection(2), "key-2", "user-1");
    createInspection.mockRejectedValueOnce(new TypeError("Failed to fetch"));

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 0, failed: 1, skippedForeign: 0 });
    expect(createInspection).toHaveBeenCalledTimes(1);
    const remaining = await db.getPendingEntries("pending-inspections");
    expect(remaining).toHaveLength(2);
    expect(remaining.every((entry) => entry.lastError === undefined)).toBe(true);
  });

  it("never sends entries queued by another user", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-2");
    createInspection.mockResolvedValue({ id: "x" } as never);

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 0, failed: 0, skippedForeign: 1 });
    expect(createInspection).not.toHaveBeenCalled();
    expect(await db.getPendingEntries("pending-inspections")).toHaveLength(1);
  });

  it("shares a single in-flight run across concurrent callers instead of double-processing the queue", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    createInspection.mockResolvedValue({ id: "x" } as never);

    const [first, second] = await Promise.all([
      sync.syncPendingEntries("user-1"),
      sync.syncPendingEntries("user-1"),
    ]);

    expect(first).toBe(second);
    expect(createInspection).toHaveBeenCalledTimes(1);
  });

  it("a caller that changed nothing shares the running run, even once it has begun", async () => {
    await takePhoto("session-1");
    await photos.attachSessionToInspection("session-1", "srv-1");
    const upload = openRequest();
    uploadDocument.mockReturnValueOnce(upload.promise);
    const running = sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(uploadDocument).toHaveBeenCalledTimes(1));

    // The band's triggers on a reconnect (`online` event, connectivity check).
    const reconnect = sync.syncPendingEntries("user-1");
    upload.answer({ id: "doc-1" });

    expect(reconnect).toBe(running);
    expect(await running).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(uploadDocument).toHaveBeenCalledTimes(1);
  });

  it("runs exactly once more for callers that changed something after the run began, so it does not wait", async () => {
    await takePhoto("session-1");
    await photos.attachSessionToInspection("session-1", "srv-1");
    const firstUpload = openRequest();
    uploadDocument
      .mockReturnValueOnce(firstUpload.promise)
      .mockResolvedValue({ id: "doc-2" } as never);
    const running = sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(uploadDocument).toHaveBeenCalledTimes(1));

    // An online save while the running sync uploads: its photo is ready only now.
    await takePhoto("session-2");
    await photos.attachSessionToInspection("session-2", "srv-2");
    const afterSave = sync.syncPendingEntries("user-1", { afterChange: true });
    // e.g. „Erneut senden“
    const afterRetry = sync.syncPendingEntries("user-1", { afterChange: true });
    firstUpload.answer({ id: "doc-1" });

    expect(await running).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(afterRetry).toBe(afterSave);
    expect(await afterSave).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(uploadDocument.mock.calls.map(([, inspectionId]) => inspectionId)).toEqual([
      "srv-1",
      "srv-2",
    ]);
    expect(await photos.listSessionPhotos("session-2")).toEqual([]);
  });

  it("never sends a user's entries after cancelSync() during a running sync", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    await db.queueInspection(inspection(2), "key-2", "user-1");
    const firstRequest = openRequest();
    createInspection.mockReturnValueOnce(firstRequest.promise).mockResolvedValue({ id: "x" } as never);
    const run = sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(createInspection).toHaveBeenCalledTimes(1));

    // Logout: stop the run before the access token changes.
    const cancelled = sync.cancelSync();
    firstRequest.answer({ id: "saved-1" });
    await cancelled;

    // The request already on its way is finished properly, nothing after it is sent.
    expect(await run).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(sentColonies()).toEqual(["colony-1"]);
    const remaining = await db.getPendingEntries("pending-inspections");
    expect(remaining.map((entry) => entry.idempotencyKey)).toEqual(["key-2"]);
  });

  it("starts another user's run only after the current one finished", async () => {
    await db.queueInspection(inspection(1), "key-a1", "user-a");
    await db.queueInspection(inspection(2), "key-b1", "user-b");
    const firstRequest = openRequest();
    createInspection.mockReturnValueOnce(firstRequest.promise).mockResolvedValue({ id: "x" } as never);
    const runA = sync.syncPendingEntries("user-a");
    await vi.waitFor(() => expect(createInspection).toHaveBeenCalledTimes(1));

    const runB = sync.syncPendingEntries("user-b");
    await settle();
    expect(createInspection).toHaveBeenCalledTimes(1);
    firstRequest.answer({ id: "saved-a1" });

    expect(await runA).toEqual({ synced: 1, failed: 0, skippedForeign: 1 });
    expect(await runB).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(sentColonies()).toEqual(["colony-1", "colony-2"]);
  });

  it("after a logout and the next login, never sends the first user's entries", async () => {
    await db.queueInspection(inspection(1), "key-a1", "user-a");
    await db.queueInspection(inspection(2), "key-a2", "user-a");
    await db.queueInspection(inspection(3), "key-b1", "user-b");
    const firstRequest = openRequest();
    createInspection.mockReturnValueOnce(firstRequest.promise).mockResolvedValue({ id: "x" } as never);
    const runA = sync.syncPendingEntries("user-a");
    await vi.waitFor(() => expect(createInspection).toHaveBeenCalledTimes(1));

    // A signs out (the cancel is awaited before the token changes) ...
    const cancelled = sync.cancelSync();
    firstRequest.answer({ id: "saved-a1" });
    await cancelled;
    // ... and B signs in on the same device: B's token is set, sync opens again.
    sync.resumeSync();
    const runB = await sync.syncPendingEntries("user-b");

    expect(await runA).toEqual({ synced: 1, failed: 0, skippedForeign: 1 });
    expect(runB).toEqual({ synced: 1, failed: 0, skippedForeign: 1 });
    expect(sentColonies()).toEqual(["colony-1", "colony-3"]);
    const remaining = await db.getPendingEntries("pending-inspections");
    expect(remaining.map((entry) => entry.idempotencyKey)).toEqual(["key-a2"]);
  });

  it("sends nothing between cancelSync() and resumeSync(), not even for the same user", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    await db.queueInspection(inspection(2), "key-2", "user-1");
    const firstRequest = openRequest();
    createInspection.mockReturnValueOnce(firstRequest.promise).mockResolvedValue({ id: "x" } as never);
    void sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(createInspection).toHaveBeenCalledTimes(1));

    const cancelled = sync.cancelSync();
    // E.g. an `online` event while the logout still waits for the cancel.
    const late = sync.syncPendingEntries("user-1");
    firstRequest.answer({ id: "saved-1" });
    await cancelled;

    expect(await late).toEqual({ synced: 0, failed: 0, skippedForeign: 0 });
    expect(await sync.syncPendingEntries("user-1")).toEqual({
      synced: 0,
      failed: 0,
      skippedForeign: 0,
    });
    expect(sentColonies()).toEqual(["colony-1"]);

    sync.resumeSync();

    expect(await sync.syncPendingEntries("user-1")).toEqual({
      synced: 1,
      failed: 0,
      skippedForeign: 0,
    });
    expect(sentColonies()).toEqual(["colony-1", "colony-2"]);
  });

  it("re-checks each entry right before sending it", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    await db.queueInspection(inspection(2), "key-2", "user-1");
    await db.queueInspection(inspection(3), "key-3", "user-1");
    const firstRequest = openRequest();
    createInspection.mockReturnValueOnce(firstRequest.promise).mockResolvedValue({ id: "x" } as never);
    const run = sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(createInspection).toHaveBeenCalledTimes(1));

    // While the first request is open: the second entry is discarded in the
    // queue sheet, and the third no longer belongs to this user.
    const [, second, third] = await db.getPendingEntries("pending-inspections");
    await db.discardQueueItem({
      store: "pending-inspections",
      id: second.id,
      label: "Durchsicht",
      queuedAt: second.queuedAt,
    });
    const raw = await openDB("apicore-offline");
    await raw.put("pending-inspections", { ...third, ownerUserId: "user-2" });
    raw.close();
    firstRequest.answer({ id: "saved-1" });

    expect(await run).toEqual({ synced: 1, failed: 0, skippedForeign: 1 });
    expect(sentColonies()).toEqual(["colony-1"]);
  });

  it("uploads photos only after their inspection synced in the same run", async () => {
    await db.queueInspection(inspection(1), "inspection-key", "user-1");
    await db.queueTreatment(
      { colonyId: "colony-1", date: "2026-10-01T00:00:00.000Z", product: "Oxuvar" },
      "treatment-key",
      "user-1",
    );
    const photo = await takePhoto("session-1");
    await photos.attachSessionToQueuedInspection("session-1", "inspection-key");
    createInspection.mockResolvedValue({ id: "srv-1" } as never);
    const treatmentRequest = openRequest();
    createTreatment.mockReturnValueOnce(treatmentRequest.promise);
    uploadDocument.mockResolvedValue({ id: "doc-1" } as never);

    const run = sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(createTreatment).toHaveBeenCalledTimes(1));
    await vi.waitFor(async () =>
      expect(await db.getPendingEntries("pending-inspections")).toEqual([]),
    );
    // The inspection is on the server, another record drain still runs: no photo yet.
    await settle();
    expect(uploadDocument).not.toHaveBeenCalled();
    treatmentRequest.answer({ id: "srv-t1" });

    expect(await run).toEqual({ synced: 3, failed: 0, skippedForeign: 0 });
    // The photos got the server id while the inspection was still queued.
    expect(photoHandOver.calls).toEqual([
      { key: "inspection-key", inspectionId: "srv-1", entryStillQueued: true },
    ]);
    expect(uploadDocument).toHaveBeenCalledTimes(1);
    expect(uploadDocument).toHaveBeenCalledWith("INSPECTION", "srv-1", expect.anything(), {
      idempotencyKey: photo.uploadIdempotencyKey,
      fileName: photo.fileName,
    });
    expect(await photos.listSessionPhotos("session-1")).toEqual([]);
  });

  it("finishes the user's open photo hand-overs before uploading, never another user's", async () => {
    const own = await takePhoto("session-1");
    await photos.addDraftPhoto({
      sessionId: "session-2",
      ownerUserId: "user-2",
      blob: new Blob(["jpeg"], { type: "image/jpeg" }),
      date: "2026-10-01",
    });
    // Saved online, but the photos could not be tied to the inspection then.
    rememberHandOver({ userId: "user-1", sessionId: "session-1", inspectionId: "srv-1" });
    rememberHandOver({ userId: "user-2", sessionId: "session-2", inspectionId: "srv-2" });
    uploadDocument.mockResolvedValue({ id: "doc-1" } as never);

    const result = await sync.syncPendingEntries("user-1");

    expect(result).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(uploadDocument).toHaveBeenCalledTimes(1);
    expect(uploadDocument).toHaveBeenCalledWith("INSPECTION", "srv-1", expect.anything(), {
      idempotencyKey: own.uploadIdempotencyKey,
      fileName: own.fileName,
    });
    expect(readHandOvers()).toEqual([
      { userId: "user-2", sessionId: "session-2", inspectionId: "srv-2" },
    ]);
    const [foreign] = await photos.listSessionPhotos("session-2");
    expect(foreign.state).toBe("draft");
  });

  it("keeps an inspection whose photo hand-over failed and still finishes the run", async () => {
    await db.queueInspection(inspection(1), "key-1", "user-1");
    await db.queueInspection(inspection(2), "key-2", "user-1");
    const photo = await takePhoto("session-1");
    await photos.attachSessionToQueuedInspection("session-1", "key-1");
    createInspection
      .mockResolvedValueOnce({ id: "srv-1" } as never)
      .mockResolvedValueOnce({ id: "srv-2" } as never);
    photoHandOver.failFor = "key-1";

    const first = await sync.syncPendingEntries("user-1");

    expect(first).toEqual({ synced: 1, failed: 1, skippedForeign: 0 });
    const [kept] = await db.getPendingEntries("pending-inspections");
    expect(kept.idempotencyKey).toBe("key-1");
    expect(kept.lastError).toBeUndefined();
    expect(uploadDocument).not.toHaveBeenCalled();

    // Next run: the same key brings back the same server record, the photo follows it.
    photoHandOver.failFor = null;
    createInspection.mockResolvedValue({ id: "srv-1" } as never);
    uploadDocument.mockResolvedValue({ id: "doc-1" } as never);
    const second = await sync.syncPendingEntries("user-1");

    expect(second).toEqual({ synced: 2, failed: 0, skippedForeign: 0 });
    expect(createInspection).toHaveBeenLastCalledWith(inspection(1), { idempotencyKey: "key-1" });
    expect(uploadDocument).toHaveBeenCalledWith(
      "INSPECTION",
      "srv-1",
      expect.anything(),
      expect.objectContaining({ idempotencyKey: photo.uploadIdempotencyKey }),
    );
    expect(await db.getPendingEntries("pending-inspections")).toEqual([]);
  });

  it("never uploads photos after cancelSync()", async () => {
    await db.queueInspection(inspection(1), "inspection-key", "user-1");
    await takePhoto("session-1");
    await photos.attachSessionToQueuedInspection("session-1", "inspection-key");
    const request = openRequest();
    createInspection.mockReturnValueOnce(request.promise);
    uploadDocument.mockResolvedValue({ id: "doc-1" } as never);
    const run = sync.syncPendingEntries("user-1");
    await vi.waitFor(() => expect(createInspection).toHaveBeenCalledTimes(1));

    const cancelled = sync.cancelSync();
    request.answer({ id: "srv-1" });
    await cancelled;

    expect(await run).toEqual({ synced: 1, failed: 0, skippedForeign: 0 });
    expect(uploadDocument).not.toHaveBeenCalled();
    const [photo] = await photos.listSessionPhotos("session-1");
    expect(photo).toMatchObject({ state: "ready", inspectionId: "srv-1" });
  });
});

describe("drainHiveTimeline", () => {
  let postHiveChange: MockedFunction<typeof import("@/lib/hive/api").postHiveChange>;
  const op = (value: string) => ({ op: "setLabel" as const, id: "b", label: value });
  const hiveEntry = (colonyId: string, value: string) => ({
    colonyId,
    occurredOn: "2026-10-15",
    source: "CARD" as const,
    ops: [op(value)],
  });
  const withHive = (colony: number, value: string) => ({
    ...inspection(colony),
    hiveChange: { ops: [op(value)] },
  });
  /** Entries queued in the same millisecond would tie on queuedAt. */
  const tick = () => new Promise((resolve) => setTimeout(resolve, 3));
  const labelsSent = () =>
    postHiveChange.mock.calls.map(([, input]) => (input.ops[0] as { label: string }).label);

  beforeEach(async () => {
    globalThis.indexedDB = new IDBFactory();
    window.localStorage.clear();
    vi.resetModules();
    db = await import("./db");
    sync = await import("./sync");
    ApiError = (await import("@/lib/auth/api-client")).ApiError;
    createInspection = vi.mocked((await import("@/lib/inspections/api")).createInspection);
    postHiveChange = vi.mocked((await import("@/lib/hive/api")).postHiveChange);
    // The describe above leaves a mock that resolves uploads: start from scratch.
    uploadDocument = vi.mocked((await import("@/lib/documents/api")).uploadDocument);
    uploadDocument.mockReset();
    // The photo store mock wraps the first module instance, which keeps its
    // own connection: photos of earlier tests are still there and would be uploaded.
    const photoStore = await import("@/lib/photos/store");
    for (const photo of await photoStore.listPendingPhotos("user-1")) {
      await photoStore.discardReadyPhoto(photo.id);
    }
    refreshPacksAfterSync = vi.mocked(
      (await import("@/lib/apiaries/offline-pack")).refreshPacksAfterSync,
    );
    createInspection.mockReset().mockResolvedValue({ id: "i" } as never);
    postHiveChange.mockReset().mockResolvedValue({} as never);
    refreshPacksAfterSync.mockReset().mockResolvedValue(undefined);
  });

  it("sends hive entries and inspections with a hive change in queuedAt order across both queues", async () => {
    const order: string[] = [];
    postHiveChange.mockImplementation(async (_c, input) => {
      order.push(`hive:${(input.ops[0] as { label: string }).label}`);
      return {} as never;
    });
    createInspection.mockImplementation(async (input) => {
      order.push(`inspection:${(input.hiveChange?.ops[0] as { label: string }).label}`);
      return { id: "i" } as never;
    });
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "k1", "user-1");
    await tick();
    await db.queueInspection(withHive(1, "b") as never, "k2", "user-1");
    await tick();
    await db.queueHiveChange(hiveEntry("colony-1", "c"), "k3", "user-1");

    const result = await sync.syncPendingEntries("user-1");

    expect(order).toEqual(["hive:a", "inspection:b", "hive:c"]);
    expect(result).toEqual({ synced: 3, failed: 0, skippedForeign: 0 });
    expect(await db.getPendingEntries("pending-hive-changes")).toEqual([]);
    expect(await db.getPendingEntries("pending-inspections")).toEqual([]);
  });

  it("sends each entry with its own idempotency key", async () => {
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "key-hive", "user-1");

    await sync.syncPendingEntries("user-1");

    expect(postHiveChange).toHaveBeenCalledWith(
      "colony-1",
      { occurredOn: "2026-10-15", source: "CARD", ops: [op("a")] },
      "key-hive",
    );
  });

  it("leaves inspections with a hive change to the timeline and sends plain ones in the normal drain", async () => {
    await db.queueInspection(inspection(1), "plain", "user-1");
    await db.queueInspection(withHive(2, "x") as never, "with-hive", "user-1");

    await sync.syncPendingEntries("user-1");

    expect(createInspection).toHaveBeenCalledTimes(2);
    expect(createInspection.mock.calls.map(([, options]) => options?.idempotencyKey).sort()).toEqual([
      "plain",
      "with-hive",
    ]);
  });

  it("holds later hive entries of the colony after a conflict, but not other colonies", async () => {
    postHiveChange.mockImplementation(async (colonyId, input) => {
      if (colonyId === "colony-1" && (input.ops[0] as { label: string }).label === "a") {
        throw new ApiError(409, "Konflikt", { code: "HIVE_CONFLICT", opIndex: 0, reason: "MISSING_ID: x" });
      }
      return {} as never;
    });
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "k1", "user-1");
    await tick();
    await db.queueInspection(withHive(1, "b") as never, "k2", "user-1");
    await tick();
    await db.queueHiveChange(hiveEntry("colony-2", "c"), "k3", "user-1");

    const result = await sync.syncPendingEntries("user-1");

    expect(labelsSent()).toEqual(["a", "c"]);
    expect(createInspection).not.toHaveBeenCalled();
    expect(result.failed).toBe(1);
    const [held] = await db.getPendingEntries("pending-inspections");
    expect(held.lastError).toBeUndefined();
    const [rejected] = await db.getPendingEntries("pending-hive-changes");
    expect(rejected.lastError).toMatchObject({ status: 409 });
  });

  it("keeps only the small part of a conflict body in the stored rejection", async () => {
    postHiveChange.mockRejectedValue(
      new ApiError(409, "Konflikt", {
        code: "HIVE_CONFLICT",
        opIndex: 2,
        reason: "MISSING_ID: x",
        current: { version: 7, state: { schemaVersion: 1, stack: [{ id: "big" }] } },
      }),
    );
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "k1", "user-1");

    await sync.syncPendingEntries("user-1");

    const [entry] = await db.getPendingEntries("pending-hive-changes");
    expect(entry.lastError?.details).toEqual({
      code: "HIVE_CONFLICT",
      opIndex: 2,
      reason: "MISSING_ID: x",
      current: { version: 7 },
    });
  });

  it("holds the colony after a 403 and marks the inspection with the hive change", async () => {
    createInspection.mockRejectedValue(new ApiError(403, "Forbidden"));
    await db.queueInspection(withHive(1, "a") as never, "k1", "user-1");
    await tick();
    await db.queueHiveChange(hiveEntry("colony-1", "b"), "k2", "user-1");

    await sync.syncPendingEntries("user-1");

    expect(postHiveChange).not.toHaveBeenCalled();
    const [entry] = await db.getPendingEntries("pending-inspections");
    expect(entry.lastError).toMatchObject({ status: 403 });
  });

  it("stops at a network error and sends the rest in the next run, in order", async () => {
    postHiveChange.mockRejectedValueOnce(new TypeError("Failed to fetch"));
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "k1", "user-1");
    await tick();
    await db.queueHiveChange(hiveEntry("colony-2", "b"), "k2", "user-1");

    await sync.syncPendingEntries("user-1");
    expect(labelsSent()).toEqual(["a"]);
    expect((await db.getPendingEntries("pending-hive-changes")).map((e) => e.lastError)).toEqual([
      undefined,
      undefined,
    ]);

    await sync.syncPendingEntries("user-1");
    expect(labelsSent()).toEqual(["a", "a", "b"]);
  });

  it("stops at a 5xx instead of marking the entry", async () => {
    postHiveChange.mockRejectedValueOnce(new ApiError(500, "Boom"));
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "k1", "user-1");
    await db.queueHiveChange(hiveEntry("colony-2", "b"), "k2", "user-1");

    await sync.syncPendingEntries("user-1");

    expect(labelsSent()).toEqual(["a"]);
    const entries = await db.getPendingEntries("pending-hive-changes");
    expect(entries.every((entry) => entry.lastError === undefined)).toBe(true);
  });

  it("treats a key still in progress (409) as retry later and holds the colony", async () => {
    postHiveChange.mockRejectedValueOnce(
      new ApiError(409, "Diese Anfrage wird bereits verarbeitet - bitte kurz warten"),
    );
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "k1", "user-1");
    await db.queueHiveChange(hiveEntry("colony-1", "b"), "k2", "user-1");

    await sync.syncPendingEntries("user-1");

    expect(labelsSent()).toEqual(["a"]);
    expect((await db.getPendingEntries("pending-hive-changes"))[0].lastError).toBeUndefined();
  });

  it("never sends another account's hive entries", async () => {
    await db.queueHiveChange(hiveEntry("colony-1", "a"), "k1", "user-2");

    const result = await sync.syncPendingEntries("user-1");

    expect(postHiveChange).not.toHaveBeenCalled();
    expect(result.skippedForeign).toBe(1);
  });

  it("sends the inspection without its hive change after strip-and-resend, with the same key", async () => {
    createInspection.mockRejectedValueOnce(new ApiError(403, "Forbidden"));
    await db.queueInspection(withHive(1, "a") as never, "same-key", "user-1");
    await sync.syncPendingEntries("user-1");
    const [rejected] = await db.getPendingEntries("pending-inspections");

    await db.retryInspectionWithoutHiveChange(rejected.id);
    await sync.syncPendingEntries("user-1");

    const [input, options] = createInspection.mock.calls[1];
    expect(input).not.toHaveProperty("hiveChange");
    expect(options?.idempotencyKey).toBe("same-key");
    expect(await db.getPendingEntries("pending-inspections")).toEqual([]);
  });
});