// @vitest-environment jsdom
//
// uploadReq is the XHR upload path (progress/abort/error/401/4xx-localize) that `fetch`/`req` can't
// cover. UploadDialog's DOM test mocks api.uploadDownload wholesale, so without this the abort, 401,
// and structured-detail-localize branches ship untested. A controllable fake XMLHttpRequest drives
// each lifecycle branch.
import { describe, it, expect, beforeEach, vi } from "vitest";

const { reportError, notify, remove, getActiveToasts } = vi.hoisted(() => ({
  reportError: vi.fn(),
  notify: vi.fn(() => 1),
  remove: vi.fn(),
  getActiveToasts: vi.fn((): { id: number }[] => []),
}));

vi.mock("../errorDialog", () => ({ reportError }));
vi.mock("../notifications", () => ({ notify, remove, getActiveToasts }));
vi.mock("../../i18n", () => ({ default: { t: (k: string) => k, language: "en" } }));
vi.mock("../activeAccount", () => ({
  activeAccountId: () => null,
  ACTIVE_ACCOUNT_KEY: "k",
  notifyActiveAccountChange: vi.fn(),
}));

import { req, uploadReq, setUnauthorizedHandler, HttpError, alreadyReported } from "./core";

// A fake XHR whose lifecycle the test drives: capture the instance, set status/responseText, then
// invoke onload/onerror/abort by hand.
class FakeXHR {
  static last: FakeXHR;
  status = 0;
  responseText = "";
  withCredentials = false;
  headers: Record<string, string> = {};
  upload: { onprogress: ((e: ProgressEvent) => void) | null } = { onprogress: null };
  onload: (() => void) | null = null;
  onerror: (() => void) | null = null;
  onabort: (() => void) | null = null;
  sent = false;
  constructor() {
    FakeXHR.last = this;
  }
  open() {}
  setRequestHeader(k: string, v: string) {
    this.headers[k] = v;
  }
  send() {
    this.sent = true;
  }
  abort() {
    this.onabort?.();
  }
}

beforeEach(() => {
  reportError.mockReset();
  notify.mockReset();
  remove.mockReset();
  getActiveToasts.mockReset();
  getActiveToasts.mockReturnValue([]);
  setUnauthorizedHandler(null);
  vi.stubGlobal("XMLHttpRequest", FakeXHR as unknown as typeof XMLHttpRequest);
});

const form = () => new FormData();

describe("uploadReq", () => {
  it("resolves with the parsed JSON on a 2xx", async () => {
    const p = uploadReq<{ id: number }>("/u", form());
    const x = FakeXHR.last;
    x.status = 200;
    x.responseText = '{"id":7}';
    x.onload!();
    await expect(p).resolves.toEqual({ id: 7 });
  });

  it("rejects immediately if the signal is already aborted (never sends)", async () => {
    const ac = new AbortController();
    ac.abort();
    const p = uploadReq("/u", form(), { signal: ac.signal });
    await expect(p).rejects.toBeInstanceOf(HttpError);
    expect(FakeXHR.last?.sent).not.toBe(true);
  });

  it("aborts the XHR and rejects when the signal fires", async () => {
    const ac = new AbortController();
    const p = uploadReq("/u", form(), { signal: ac.signal });
    ac.abort(); // → our abort listener calls xhr.abort() → onabort → reject
    await expect(p).rejects.toMatchObject({ status: 0 });
  });

  it("calls the unauthorized handler on 401", async () => {
    const onUnauth = vi.fn();
    setUnauthorizedHandler(onUnauth);
    const p = uploadReq("/u", form());
    const x = FakeXHR.last;
    x.status = 401;
    x.onload!();
    await expect(p).rejects.toBeInstanceOf(HttpError);
    expect(onUnauth).toHaveBeenCalledOnce();
    expect(reportError).not.toHaveBeenCalled();
  });

  it("localizes a structured 422 upload_too_large and surfaces the error", async () => {
    const p = uploadReq("/u", form());
    const x = FakeXHR.last;
    x.status = 422;
    x.responseText = '{"detail":{"code":"upload_too_large","limit":5}}';
    x.onload!();
    await expect(p).rejects.toMatchObject({ status: 422 });
    // localizeDetail routes upload_too_large → the tooLarge key (t is passthrough in the mock).
    expect(reportError).toHaveBeenCalledWith("downloads.errors.upload.tooLarge");
  });

  it("reports a connectivity failure on a network error", async () => {
    const p = uploadReq("/u", form());
    FakeXHR.last.onerror!();
    await expect(p).rejects.toMatchObject({ status: 0 });
    // The soft self-clearing "connection lost" toast (via notify), not a blocking modal.
    expect(notify).toHaveBeenCalled();
    expect(reportError).not.toHaveBeenCalled();
  });
});

describe("req — a structured refusal reads in the user's language", () => {
  it("names a playlist that is gone instead of passing the server's English through", async () => {
    // The 404 every playlist route answers when the list was deleted in another tab. It used to be a
    // bare "Unknown playlist" string, shown verbatim under the Hungarian UI.
    vi.spyOn(globalThis, "fetch").mockResolvedValue(
      new Response(JSON.stringify({ detail: { code: "not_found", reason: "playlist" } }), {
        status: 404,
        headers: { "content-type": "application/json" },
      }),
    );
    await expect(req("/api/playlists/7/items/v1", { method: "DELETE" })).rejects.toMatchObject({
      status: 404,
      detail: "errors.notFound.playlist",
    });
    expect(reportError).not.toHaveBeenCalled(); // a 404 is the caller's to report
  });
});

describe("req — what it has already put in front of the user", () => {
  // A caller that toasts a failed action on top of the dialog `req` already opened reported one fault
  // twice. `alreadyReported` is how `notifyActionError` tells the two apart.
  const answer = (status: number) =>
    vi.spyOn(globalThis, "fetch").mockResolvedValue(
      new Response(JSON.stringify({ detail: "x" }), {
        status,
        headers: { "content-type": "application/json" },
      }),
    );

  it.each([500, 422, 409, 400])("marks a %s it raised the error dialog for", async (status) => {
    answer(status);
    const err = await req("/api/x", { method: "POST" }).catch((e: unknown) => e);
    expect(reportError).toHaveBeenCalled();
    expect(alreadyReported(err)).toBe(true);
  });

  it.each([404, 403, 429])("leaves a %s to the caller", async (status) => {
    answer(status);
    const err = await req("/api/x", { method: "POST" }).catch((e: unknown) => e);
    expect(err).toBeInstanceOf(HttpError);
    expect(alreadyReported(err)).toBe(false);
  });

  it("marks a 401 the app shell handles (it signs the tab out)", async () => {
    answer(401);
    const err = await req("/api/x", { method: "POST" }).catch((e: unknown) => e);
    expect(alreadyReported(err)).toBe(true);
  });

  // The connection notice says the server is unreachable — not that THIS action failed — and it
  // removes itself on the very next answer (the caller's own resync refetch). Marked as reported, a
  // delete that hit a keepalive reset flashed the notice and was then reported nowhere at all.
  it("raises the connection notice for a request that never reached the server, and leaves the failed action to the caller", async () => {
    vi.spyOn(globalThis, "fetch").mockRejectedValue(new TypeError("Failed to fetch"));
    const err = await req("/api/x", { method: "POST" }).catch((e: unknown) => e);
    expect(notify).toHaveBeenCalled();
    expect(alreadyReported(err)).toBe(false);
  });

  it.each([502, 503, 504])(
    "raises the connection notice for a %s, and leaves the failed action to the caller",
    async (status) => {
      answer(status);
      const err = await req("/api/x", { method: "POST" }).catch((e: unknown) => e);
      expect(notify).toHaveBeenCalled();
      expect(reportError).not.toHaveBeenCalled();
      expect(err).toMatchObject({ status });
      expect(alreadyReported(err)).toBe(false);
    },
  );

  it("raises the connection notice again after the user closed it", async () => {
    vi.spyOn(globalThis, "fetch").mockRejectedValue(new TypeError("Failed to fetch"));
    notify.mockReturnValue(7);
    await req("/api/x", { method: "POST" }).catch(() => {});
    getActiveToasts.mockReturnValue([{ id: 7 }]); // still on screen: one notice, not a stack
    notify.mockClear();
    await req("/api/x", { method: "POST" }).catch(() => {});
    expect(notify).not.toHaveBeenCalled();
    getActiveToasts.mockReturnValue([]); // closed with its ✕
    await req("/api/x", { method: "POST" }).catch(() => {});
    expect(notify).toHaveBeenCalledOnce();
  });

  it("marks what the upload path reported the same way", async () => {
    const dead = uploadReq("/u", form());
    FakeXHR.last.onerror!();
    expect(alreadyReported(await dead.catch((e: unknown) => e))).toBe(false);
    const refused = uploadReq("/u", form());
    FakeXHR.last.status = 500;
    FakeXHR.last.onload!();
    expect(alreadyReported(await refused.catch((e: unknown) => e))).toBe(true);
    const gone = uploadReq("/u", form());
    FakeXHR.last.status = 404;
    FakeXHR.last.onload!();
    expect(alreadyReported(await gone.catch((e: unknown) => e))).toBe(false);
  });

  it("treats a gateway error on the upload path as the connection notice, not a blocking dialog", async () => {
    // The upload path kept its own copy of this policy, and it had drifted: a 502 opened the
    // blocking "Server error (502)" dialog and cleared a connection notice that was still true.
    notify.mockReturnValue(9);
    vi.spyOn(globalThis, "fetch").mockRejectedValue(new TypeError("Failed to fetch"));
    await req("/api/x", { method: "POST" }).catch(() => {}); // a notice is up
    getActiveToasts.mockReturnValue([{ id: 9 }]);
    remove.mockClear();
    const p = uploadReq("/u", form());
    FakeXHR.last.status = 502;
    FakeXHR.last.onload!();
    await expect(p).rejects.toMatchObject({ status: 502 });
    expect(reportError).not.toHaveBeenCalled();
    expect(remove).not.toHaveBeenCalled();
  });
});