import { expect, test, beforeEach } from "bun:test";
import { Window } from "happy-dom";
import { REACTIVE_RUNTIME } from "../src/reactive-runtime.ts";
import { restoreGlobalsAfterAll } from "./global-restore.ts";

const REPLACED_GLOBALS = ["window", "document", "location", "fetch", "NodeFilter"];
restoreGlobalsAfterAll(REPLACED_GLOBALS);

beforeEach(() => {
  for (const name of REPLACED_GLOBALS) delete (globalThis as Record<string, unknown>)[name];
});

interface Call {
  url: string;
  init: RequestInit;
}

/** Mount the runtime with a recording fetch and return its callApi plus the calls made. */
function harness(response: { status: number; payload: unknown }) {
  const win = new Window() as unknown as Window & Record<string, unknown>;
  win.document.body.innerHTML = `<div data-scope="x: 1"></div>`;
  const calls: Call[] = [];

  (globalThis as Record<string, unknown>).window = win;
  (globalThis as Record<string, unknown>).document = win.document;
  (globalThis as Record<string, unknown>).location = win.location;
  (globalThis as Record<string, unknown>).NodeFilter = (
    win as unknown as { NodeFilter: unknown }
  ).NodeFilter;
  (globalThis as Record<string, unknown>).fetch = (url: string, init: RequestInit) => {
    calls.push({ url, init });
    return Promise.resolve({
      ok: response.status >= 200 && response.status < 300,
      status: response.status,
      json: () => Promise.resolve(response.payload),
    });
  };

  (0, eval)(REACTIVE_RUNTIME);
  const callApi = (win as unknown as { __wrnexusCallApi: (...args: any[]) => Promise<any> })
    .__wrnexusCallApi;
  return { callApi, calls, win };
}

test("GET builds a query string and omits undefined fields", async () => {
  const { callApi, calls } = harness({ status: 200, payload: { users: [] } });

  await callApi("/api/users", "GET", { name: "Ajay", age: undefined });

  expect(calls[0]!.url).toBe("/api/users?name=Ajay");
  expect(calls[0]!.init.method).toBe("GET");
  expect(calls[0]!.init.body).toBeUndefined();
});

test("POST sends a JSON body", async () => {
  const { callApi, calls } = harness({ status: 200, payload: { ok: true } });

  await callApi("/api/users", "POST", { name: "Ajay" });

  expect(calls[0]!.url).toBe("/api/users");
  expect(calls[0]!.init.body).toBe(JSON.stringify({ name: "Ajay" }));
  expect((calls[0]!.init.headers as Record<string, string>)["content-type"]).toBe(
    "application/json",
  );
});

test("a non-GET request carries the CSRF token from the cookie", async () => {
  const { callApi, calls, win } = harness({ status: 200, payload: {} });
  win.document.cookie = "wrn-csrf=token-123";

  await callApi("/api/users", "POST", {});

  expect((calls[0]!.init.headers as Record<string, string>)["x-csrf-token"]).toBe("token-123");
});

test("a 2xx resolves to the parsed payload", async () => {
  const { callApi } = harness({ status: 200, payload: { users: [{ name: "Ajay" }] } });

  expect(await callApi("/api/users", "GET", {})).toEqual({ users: [{ name: "Ajay" }] });
});

test("a 204 with no body resolves to undefined instead of rejecting", async () => {
  const win = new Window() as unknown as Window & Record<string, unknown>;
  win.document.body.innerHTML = `<div data-scope="x: 1"></div>`;

  (globalThis as Record<string, unknown>).window = win;
  (globalThis as Record<string, unknown>).document = win.document;
  (globalThis as Record<string, unknown>).location = win.location;
  (globalThis as Record<string, unknown>).NodeFilter = (
    win as unknown as { NodeFilter: unknown }
  ).NodeFilter;
  (globalThis as Record<string, unknown>).fetch = () =>
    Promise.resolve({
      ok: true,
      status: 204,
      json: () => Promise.reject(new SyntaxError("Unexpected end of JSON input")),
    });

  (0, eval)(REACTIVE_RUNTIME);
  const callApi = (win as unknown as { __wrnexusCallApi: (...args: any[]) => Promise<any> })
    .__wrnexusCallApi;

  await expect(callApi("/api/users", "DELETE", {})).resolves.toBeUndefined();
});

test("a 2xx with an empty/unparseable body resolves to undefined", async () => {
  const { callApi } = harness({ status: 200, payload: undefined });
  (globalThis as Record<string, unknown>).fetch = () =>
    Promise.resolve({
      ok: true,
      status: 200,
      json: () => Promise.reject(new SyntaxError("Unexpected end of JSON input")),
    });

  await expect(callApi("/api/users", "GET", {})).resolves.toBeUndefined();
});

test("a non-2xx rejects with status, message and data", async () => {
  const { callApi } = harness({ status: 400, payload: { error: "Bad filter" } });

  const failure = await callApi("/api/users", "GET", {}).catch(
    (error: Error & { status?: number; data?: unknown }) => error,
  );

  expect(failure.status).toBe(400);
  expect(failure.message).toContain("Bad filter");
  expect(failure.data).toEqual({ error: "Bad filter" });
});