import "fake-indexeddb/auto";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { ApiError, apiFetch } from "@/lib/auth/api-client";
import { getDb } from "@/lib/offline/db";
import {
  PACK_AUTO_REFRESH_AFTER_MS,
  PACK_MAX_AGE_MS,
  PACK_STALE_MS,
  deleteAllPacks,
  findPackForColony,
  getPack,
  isPackStale,
  listPacks,
  livingColoniesFromPacks,
  loadPack,
  packAgeText,
  purgeOldPacks,
  refreshPacksAfterSync,
} from "./offline-pack";
import {
  DAY_MS,
  HOUR_MS,
  MINUTE_MS,
  offlinePack,
  packColony,
  storedPack,
} from "./offline-pack.fixtures";
import type { StoredPack } from "@/lib/offline/db";

vi.mock("@/lib/auth/api-client", async (importOriginal) => ({
  ...(await importOriginal<typeof import("@/lib/auth/api-client")>()),
  apiFetch: vi.fn(),
}));

const NOW = Date.parse("2026-10-13T12:00:00.000Z");

function savedAgo(ms: number): string {
  return new Date(NOW - ms).toISOString();
}

async function putPacks(...packs: StoredPack[]): Promise<void> {
  const db = await getDb();
  await Promise.all(packs.map((pack) => db.put("offline-packs", pack)));
}

async function storedApiaryIds(): Promise<string[]> {
  const db = await getDb();
  return (await db.getAllKeys("offline-packs")).sort();
}

describe("offline packs", () => {
  beforeEach(async () => {
    vi.mocked(apiFetch).mockReset();
    await deleteAllPacks();
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  it("stores the pack with owner and time", async () => {
    vi.useFakeTimers({ toFake: ["Date"] });
    vi.setSystemTime(NOW);
    const pack = offlinePack({ apiaryId: "apiary-1" });
    vi.mocked(apiFetch).mockResolvedValue(pack);

    const stored = await loadPack("apiary-1", "user-1");

    expect(apiFetch).toHaveBeenCalledWith("/apiaries/apiary-1/offline-pack");
    expect(stored).toEqual({
      apiaryId: "apiary-1",
      ownerUserId: "user-1",
      savedAt: new Date(NOW).toISOString(),
      pack,
    });
    expect(await getPack("apiary-1")).toEqual(stored);
  });

  it("never stores coordinates or an address, even if the server sent them", async () => {
    const pack = offlinePack({ apiaryId: "apiary-1" });
    vi.mocked(apiFetch).mockResolvedValue({
      ...pack,
      apiary: { ...pack.apiary, latitude: 52.1, longitude: 13.4, address: "Feldweg 3", notes: "Schlüssel unterm Stein" },
    });

    await loadPack("apiary-1", "user-1");

    const kept = await getPack("apiary-1");
    expect(Object.keys(kept?.pack.apiary ?? {}).sort()).toEqual(["id", "location", "name", "status"]);
  });

  it("refuses a pack it does not understand instead of storing it", async () => {
    vi.mocked(apiFetch).mockResolvedValue({ ...offlinePack(), version: 2 });

    await expect(loadPack("apiary-1", "user-1")).rejects.toThrow();
    expect(await getPack("apiary-1")).toBeNull();
  });

  it("encodes the apiary id in the request", async () => {
    vi.mocked(apiFetch).mockResolvedValue(offlinePack({ apiaryId: "a/b" }));

    await loadPack("a/b", "user-1");

    expect(apiFetch).toHaveBeenCalledWith("/apiaries/a%2Fb/offline-pack");
  });

  it("findPackForColony", async () => {
    await putPacks(
      storedPack(offlinePack({ apiaryId: "apiary-1", colonies: [packColony("colony-1", "A1")] })),
      storedPack(offlinePack({ apiaryId: "apiary-2", colonies: [packColony("colony-2", "B1")] })),
      storedPack(offlinePack({ apiaryId: "apiary-3", colonies: [packColony("colony-3", "C1")] }), {
        ownerUserId: "user-2",
      }),
    );

    expect((await findPackForColony("colony-2", "user-1"))?.apiaryId).toBe("apiary-2");
    // Another account's pack is never handed out.
    expect(await findPackForColony("colony-3", "user-1")).toBeNull();
    expect(await findPackForColony("colony-unknown", "user-1")).toBeNull();
  });

  it("findPackForColony prefers the newest pack when a colony moved between loaded apiaries", async () => {
    await putPacks(
      storedPack(offlinePack({ apiaryId: "apiary-old", colonies: [packColony("colony-1", "A1")] }), {
        savedAt: new Date(Date.now() - 2 * HOUR_MS).toISOString(),
      }),
      storedPack(offlinePack({ apiaryId: "apiary-new", colonies: [packColony("colony-1", "A1")] }), {
        savedAt: new Date(Date.now() - HOUR_MS).toISOString(),
      }),
    );

    expect((await findPackForColony("colony-1", "user-1"))?.apiaryId).toBe("apiary-new");
  });

  it("lists only the owner's packs", async () => {
    await putPacks(
      storedPack(offlinePack({ apiaryId: "apiary-1" })),
      storedPack(offlinePack({ apiaryId: "apiary-2" }), { ownerUserId: "user-2" }),
    );

    expect((await listPacks("user-1")).map((pack) => pack.apiaryId)).toEqual(["apiary-1"]);
  });

  it("never hands out a pack older than 14 days, even before it is purged", async () => {
    await putPacks(
      storedPack(offlinePack({ apiaryId: "apiary-1" }), {
        savedAt: new Date(Date.now() - PACK_MAX_AGE_MS - MINUTE_MS).toISOString(),
      }),
    );

    expect(await listPacks("user-1")).toEqual([]);
    expect(await getPack("apiary-1")).toBeNull();
  });

  it("purges packs older than 14 days", async () => {
    await putPacks(
      storedPack(offlinePack({ apiaryId: "apiary-old" }), { savedAt: savedAgo(15 * DAY_MS) }),
      storedPack(offlinePack({ apiaryId: "apiary-edge" }), { savedAt: savedAgo(PACK_MAX_AGE_MS) }),
      storedPack(offlinePack({ apiaryId: "apiary-young" }), { savedAt: savedAgo(13 * DAY_MS) }),
    );

    const purged = await purgeOldPacks(NOW);

    expect(purged).toBe(1);
    expect(await storedApiaryIds()).toEqual(["apiary-edge", "apiary-young"]);
  });

  it("stale after 24 h", () => {
    const pack = offlinePack();

    expect(isPackStale(storedPack(pack, { savedAt: savedAgo(PACK_STALE_MS - 1) }), NOW)).toBe(false);
    expect(isPackStale(storedPack(pack, { savedAt: savedAgo(PACK_STALE_MS) }), NOW)).toBe(true);
    expect(isPackStale(storedPack(pack, { savedAt: "kaputt" }), NOW)).toBe(true);
  });

  it("deletes every pack of every account", async () => {
    await putPacks(
      storedPack(offlinePack({ apiaryId: "apiary-1" })),
      storedPack(offlinePack({ apiaryId: "apiary-2" }), { ownerUserId: "user-2" }),
    );

    await deleteAllPacks();

    expect(await storedApiaryIds()).toEqual([]);
  });

  it("says how long ago a pack was loaded", () => {
    const at = (ms: number) => packAgeText(savedAgo(ms), NOW);

    expect(at(20 * 1000)).toBe("vor weniger als einer Minute");
    expect(at(MINUTE_MS)).toBe("vor 1 Minute");
    expect(at(5 * MINUTE_MS)).toBe("vor 5 Minuten");
    expect(at(HOUR_MS)).toBe("vor 1 Stunde");
    expect(at(3 * HOUR_MS + 10 * MINUTE_MS)).toBe("vor 3 Stunden");
    expect(at(DAY_MS)).toBe("vor 1 Tag");
    expect(at(2 * DAY_MS + HOUR_MS)).toBe("vor 2 Tagen");
  });

  describe("refreshPacksAfterSync", () => {
    beforeEach(() => {
      vi.useFakeTimers({ toFake: ["Date"] });
      vi.setSystemTime(NOW);
    });

    it("quietly reloads the owner's packs older than 1 h and leaves younger ones alone", async () => {
      await putPacks(
        storedPack(offlinePack({ apiaryId: "apiary-old" }), {
          savedAt: savedAgo(PACK_AUTO_REFRESH_AFTER_MS + MINUTE_MS),
        }),
        storedPack(offlinePack({ apiaryId: "apiary-young" }), { savedAt: savedAgo(30 * MINUTE_MS) }),
        storedPack(offlinePack({ apiaryId: "apiary-foreign" }), {
          ownerUserId: "user-2",
          savedAt: savedAgo(5 * HOUR_MS),
        }),
      );
      vi.mocked(apiFetch).mockResolvedValue(offlinePack({ apiaryId: "apiary-old", apiaryName: "Neu" }));

      await refreshPacksAfterSync("user-1", NOW);

      expect(apiFetch).toHaveBeenCalledTimes(1);
      expect(apiFetch).toHaveBeenCalledWith("/apiaries/apiary-old/offline-pack");
      const refreshed = await getPack("apiary-old");
      expect(refreshed?.pack.apiary.name).toBe("Neu");
      expect(refreshed?.savedAt).toBe(new Date(NOW).toISOString());
    });

    it("after a rejection reloads a 10-min-old pack holding the colony, not a 2-min-old one", async () => {
      await putPacks(
        storedPack(
          offlinePack({ apiaryId: "apiary-ten", colonies: [packColony("colony-3", "V-03")] }),
          { savedAt: savedAgo(10 * MINUTE_MS) },
        ),
        storedPack(
          offlinePack({ apiaryId: "apiary-two", colonies: [packColony("colony-3", "V-03")] }),
          { savedAt: savedAgo(2 * MINUTE_MS) },
        ),
        storedPack(
          offlinePack({ apiaryId: "apiary-other", colonies: [packColony("colony-9", "X-09")] }),
          { savedAt: savedAgo(10 * MINUTE_MS) },
        ),
      );
      vi.mocked(apiFetch).mockResolvedValue(offlinePack({ apiaryId: "apiary-ten", colonies: [] }));

      await refreshPacksAfterSync("user-1", NOW, undefined, {
        force: true,
        colonyIds: ["colony-3"],
      });

      expect(apiFetch).toHaveBeenCalledTimes(1);
      expect(apiFetch).toHaveBeenCalledWith("/apiaries/apiary-ten/offline-pack");
      // The colony ended on the server: the reloaded pack no longer offers it.
      expect((await getPack("apiary-ten"))?.pack.colonies).toEqual([]);
    });

    it("drops a pack the user may no longer read or whose apiary is gone", async () => {
      await putPacks(
        storedPack(offlinePack({ apiaryId: "apiary-gone" }), { savedAt: savedAgo(2 * HOUR_MS) }),
        storedPack(offlinePack({ apiaryId: "apiary-forbidden" }), { savedAt: savedAgo(2 * HOUR_MS) }),
        storedPack(offlinePack({ apiaryId: "apiary-broken" }), { savedAt: savedAgo(2 * HOUR_MS) }),
      );
      vi.mocked(apiFetch).mockImplementation(async (path: string) => {
        if (path.includes("apiary-gone")) throw new ApiError(404, "Apiary not found");
        if (path.includes("apiary-forbidden")) throw new ApiError(403, "Forbidden");
        throw new ApiError(500, "Internal server error");
      });

      await refreshPacksAfterSync("user-1", NOW);

      // A server failure keeps the pack: it is still the best the device knows.
      expect(await storedApiaryIds()).toEqual(["apiary-broken"]);
    });

    it("stops at the first network error and never throws", async () => {
      await putPacks(
        storedPack(offlinePack({ apiaryId: "apiary-1" }), { savedAt: savedAgo(2 * HOUR_MS) }),
        storedPack(offlinePack({ apiaryId: "apiary-2" }), { savedAt: savedAgo(2 * HOUR_MS) }),
      );
      vi.mocked(apiFetch).mockRejectedValue(new TypeError("Failed to fetch"));

      await expect(refreshPacksAfterSync("user-1", NOW)).resolves.toBeUndefined();

      expect(apiFetch).toHaveBeenCalledTimes(1);
      expect(await storedApiaryIds()).toEqual(["apiary-1", "apiary-2"]);
    });

    it("stops once the sync run is cancelled", async () => {
      await putPacks(
        storedPack(offlinePack({ apiaryId: "apiary-1" }), { savedAt: savedAgo(2 * HOUR_MS) }),
        storedPack(offlinePack({ apiaryId: "apiary-2" }), { savedAt: savedAgo(2 * HOUR_MS) }),
      );
      let cancelled = false;
      vi.mocked(apiFetch).mockImplementation(async (path: string) => {
        cancelled = true;
        return offlinePack({ apiaryId: path.split("/")[2] });
      });

      await refreshPacksAfterSync("user-1", NOW, () => cancelled);

      expect(apiFetch).toHaveBeenCalledTimes(1);
    });

    it("purges packs older than 14 days on the way", async () => {
      await putPacks(storedPack(offlinePack({ apiaryId: "apiary-old" }), { savedAt: savedAgo(20 * DAY_MS) }));

      await refreshPacksAfterSync("user-1", NOW);

      expect(apiFetch).not.toHaveBeenCalled();
      expect(await storedApiaryIds()).toEqual([]);
    });
  });
});

describe("livingColoniesFromPacks order", () => {
  it("sorts colony codes naturally (V-2 before V-10)", () => {
    const pack = storedPack(
      offlinePack({
        colonies: [packColony("c1", "V-10"), packColony("c2", "V-2"), packColony("c3", "V-010")],
      }),
    );
    expect(livingColoniesFromPacks([pack]).map((colony) => colony.code)).toEqual(["V-2", "V-010", "V-10"]);
  });
});