import "fake-indexeddb/auto";
import { IDBFactory } from "fake-indexeddb";
import { openDB } from "idb";
import { beforeEach, describe, expect, it, vi } from "vitest";

type OfflineDbModule = typeof import("./db");

const DB_NAME = "apicore-offline";
const VERSION_2_STORES = [
  "pending-inspections",
  "pending-treatments",
  "pending-feedings",
  "pending-varroa-measurements",
  "pending-swarm-control-checks",
  "pending-harvests",
];

const INSPECTION = { colonyId: "colony-1", date: "2026-10-01T00:00:00.000Z" };
const TREATMENT = { colonyId: "colony-1", date: "2026-10-01T00:00:00.000Z", product: "Oxuvar" };
const FEEDING = {
  colonyId: "colony-1",
  date: "2026-10-01T00:00:00.000Z",
  feedType: "FEED_SYRUP" as const,
  amount: 2,
  unit: "kg",
};
const REJECTION = {
  status: 400,
  message: "Volk V-03 ist beendet.",
  at: "2026-10-13T09:00:00.000Z",
};

function photo(id: string, inspectionIdempotencyKey: string, ownerUserId = "user-1") {
  return {
    id,
    sessionId: "session-1",
    ownerUserId,
    blob: new Blob(["jpeg"]),
    fileName: `${id}.jpg`,
    createdAt: "2026-10-13T08:00:00.000Z",
    state: "waiting-for-inspection",
    inspectionIdempotencyKey,
    uploadIdempotencyKey: `upload-${id}`,
  };
}

/** A fresh module, so nothing is cached from the previous test's database. */
async function loadDb(): Promise<OfflineDbModule> {
  vi.resetModules();
  return import("./db");
}

/** The queue exactly as the previous release (DB version 2) left it on a phone. */
async function createVersion2Queue(entry: object): Promise<void> {
  const db = await openDB(DB_NAME, 2, {
    upgrade(database) {
      for (const store of VERSION_2_STORES) {
        database.createObjectStore(store, { keyPath: "id", autoIncrement: true });
      }
    },
  });
  await db.add("pending-inspections", entry);
  db.close();
}

describe("offline queue database", () => {
  beforeEach(() => {
    globalThis.indexedDB = new IDBFactory();
  });

  it("upgrading v2 → v3 keeps already queued inspections", async () => {
    await createVersion2Queue({
      input: INSPECTION,
      idempotencyKey: "key-from-v2",
      queuedAt: "2026-10-01T08:00:00.000Z",
    });
    const db = await loadDb();

    const entries = await db.getPendingEntries("pending-inspections");

    expect(entries).toEqual([
      {
        id: 1,
        input: INSPECTION,
        idempotencyKey: "key-from-v2",
        queuedAt: "2026-10-01T08:00:00.000Z",
      },
    ]);
    // Entries from before owners existed still count as the user's own.
    expect(await db.summarizeQueue("user-1")).toEqual({ own: 1, failed: 0, foreign: 0 });

    const upgraded = await openDB(DB_NAME);
    expect(upgraded.version).toBe(3);
    expect([...upgraded.objectStoreNames]).toEqual(
      expect.arrayContaining([
        ...VERSION_2_STORES,
        "pending-bulk",
        "pending-photos",
        "offline-packs",
        "meta",
      ]),
    );
    expect([...upgraded.transaction("pending-photos").store.indexNames].sort()).toEqual([
      "inspectionIdempotencyKey",
      "ownerUserId",
      "sessionId",
    ]);
    upgraded.close();
  });

  it("summarizeQueue separates own, failed and foreign entries", async () => {
    const db = await loadDb();
    await db.queueInspection(INSPECTION, "key-1", "user-1");
    await db.queueTreatment(TREATMENT, "key-2", "user-1");
    await db.queueFeeding(FEEDING, "key-3", "user-2");
    const [treatment] = await db.getPendingEntries("pending-treatments");
    await db.markFailed("pending-treatments", treatment.id, REJECTION);

    expect(await db.summarizeQueue("user-1")).toEqual({ own: 1, failed: 1, foreign: 1 });
    expect(await db.summarizeQueue("user-2")).toEqual({ own: 1, failed: 0, foreign: 2 });
  });

  it("summarizeQueue counts a photo waiting on its own like an entry, never a draft or one riding with its inspection", async () => {
    const db = await loadDb();
    await db.queueInspection(INSPECTION, "inspection-key", "user-1");
    const raw = await openDB(DB_NAME);
    const ready = { ...photo("ready", "inspection-key"), state: "ready", inspectionId: "srv-1" };
    await raw.put("pending-photos", ready);
    await raw.put("pending-photos", { ...ready, id: "rejected", lastError: REJECTION });
    await raw.put("pending-photos", { ...ready, id: "foreign", ownerUserId: "user-2" });
    await raw.put("pending-photos", photo("rides-along", "inspection-key"));
    await raw.put("pending-photos", { ...photo("draft", "unused"), state: "draft" });
    raw.close();

    // The inspection itself, plus the ready photo; the rejected one separately.
    expect(await db.summarizeQueue("user-1")).toEqual({ own: 2, failed: 1, foreign: 1 });
  });

  it("toQueueError keeps the server's status, message and body", async () => {
    const db = await loadDb();
    const { ApiError } = await import("@/lib/auth/api-client");
    const body = { statusCode: 413, message: "Datei zu groß" };

    const error = db.toQueueError(new ApiError(413, "Datei zu groß", body));

    expect(error).toEqual({ status: 413, message: "Datei zu groß", details: body, at: expect.any(String) });
  });

  it("stores each entry with its key and owner", async () => {
    const db = await loadDb();
    await db.queueVarroaMeasurement(
      { colonyId: "colony-1", date: "2026-10-01T00:00:00.000Z", method: "WASHING_METHOD" as const },
      "key-1",
      "user-1",
    );

    const [entry] = await db.getPendingEntries("pending-varroa-measurements");

    expect(entry).toMatchObject({ idempotencyKey: "key-1", ownerUserId: "user-1" });
    expect(Date.parse(entry.queuedAt)).not.toBeNaN();
  });

  it("lists only the current user's entries, oldest first, with the server's message", async () => {
    const db = await loadDb();
    await db.queueInspection(INSPECTION, "key-1", "user-1");
    await db.queueFeeding(FEEDING, "key-2", "user-2");
    await db.queueTreatment(TREATMENT, "key-3", "user-1");
    const [treatment] = await db.getPendingEntries("pending-treatments");
    await db.markFailed("pending-treatments", treatment.id, REJECTION);

    const items = await db.listQueue("user-1");

    expect(items).toEqual([
      expect.objectContaining({ store: "pending-inspections", label: "Durchsicht" }),
      expect.objectContaining({
        store: "pending-treatments",
        id: treatment.id,
        label: "Behandlung",
        lastError: REJECTION,
      }),
    ]);
  });

  it("discardQueueItem deletes exactly that entry", async () => {
    const db = await loadDb();
    await db.queueInspection(INSPECTION, "key-1", "user-1");
    await db.queueInspection(INSPECTION, "key-2", "user-1");
    const [first] = await db.listQueue("user-1");

    await db.discardQueueItem(first);

    const remaining = await db.getPendingEntries("pending-inspections");
    expect(remaining.map((entry) => entry.idempotencyKey)).toEqual(["key-2"]);
  });

  it("discarding a queued inspection discards its photos and no others", async () => {
    const db = await loadDb();
    await db.queueInspection(INSPECTION, "inspection-key", "user-1");
    const raw = await openDB(DB_NAME);
    await raw.put("pending-photos", photo("p1", "inspection-key"));
    await raw.put("pending-photos", photo("p2", "other-inspection-key"));
    const [item] = await db.listQueue("user-1");
    expect(item.photoCount).toBe(1);

    await db.discardQueueItem(item);

    expect(await raw.getAllKeys("pending-photos")).toEqual(["p2"]);
    expect(await db.getPendingEntries("pending-inspections")).toEqual([]);
    raw.close();
  });

  it("clearQueueOf removes one owner's entries and photos and keeps everyone else's", async () => {
    const db = await loadDb();
    await db.queueInspection(INSPECTION, "key-1", "user-1");
    await db.queueFeeding(FEEDING, "key-2", "user-1");
    await db.queueInspection(INSPECTION, "key-3", "user-2");
    const raw = await openDB(DB_NAME);
    await raw.put("pending-photos", photo("p1", "key-1", "user-1"));
    await raw.put("pending-photos", photo("p3", "key-3", "user-2"));

    await db.clearQueueOf("user-1");

    expect(await db.summarizeQueue("user-1")).toEqual({ own: 0, failed: 0, foreign: 1 });
    const [left] = await db.getPendingEntries("pending-inspections");
    expect(left.idempotencyKey).toBe("key-3");
    expect(await raw.getAllKeys("pending-photos")).toEqual(["p3"]);
    raw.close();
  });
});