/*
Copyright 2025 Element Creations Ltd.

SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
Please see LICENSE in the repository root for full details.
*/

import {
  beforeEach,
  afterEach,
  describe,
  expect,
  it,
  type MockedObject,
  vitest,
} from "vitest";
import fetchMock from "fetch-mock";
import { MatrixError } from "matrix-js-sdk";

import {
  getSFUConfig,
  type GetSFUConfigParams,
  type ClientOpenIDParts,
} from "./openID";
import { testJWTToken } from "../../utils/test-fixtures";
import { ownMemberMock } from "../../utils/test";
import { FailToGetOpenIdToken } from "../../utils/errors";
import { logger } from "matrix-js-sdk/lib/logger";

const serviceUrl = "https://sfu.example.org";

const delayParams = {
  delayEndpointBaseUrl: "https://matrix.homeserverserver.org",
  delayId: "mock_delay_id",
};

describe("getSFUConfig", () => {
  let matrixClient: MockedObject<ClientOpenIDParts>;
  let params: GetSFUConfigParams;
  beforeEach(() => {
    fetchMock.catch(404);
    matrixClient = { getOpenIdToken: vitest.fn() };
    params = {
      client: matrixClient,
      membership: ownMemberMock,
      serviceUrl: "https://sfu.example.org",
      roomId: "!example_room_id",
      slotId: "m.call#ROOM",
      role: "publisher",
      logger,
    };
  });
  afterEach(async () => {
    void (await fetchMock.flush());
    vitest.clearAllMocks();
    fetchMock.reset();
  });

  it("should handle fetching a token", async () => {
    fetchMock.post("https://sfu.example.org/sfu/get", () => {
      return {
        status: 200,
        body: { url: serviceUrl, jwt: testJWTToken },
      };
    });
    const config = await getSFUConfig(params);
    expect(config).toEqual({
      jwt: testJWTToken,
      url: serviceUrl,
      livekitIdentity: "@me:example.org:ABCDEF",
      livekitAlias: "!example_room_id",
    });
  });

  it("should fail if the SFU errors", async () => {
    fetchMock.post("https://sfu.example.org/sfu/get", () => {
      return {
        status: 500,
        body: {
          errcode: "M_LOOKUP_FAILED",
          error: "Failed to look up user info from homeserver",
        },
      };
    });
    try {
      await getSFUConfig(params);
    } catch (ex: unknown) {
      expect(ex).toBeInstanceOf(FailToGetOpenIdToken);
      expect((ex as FailToGetOpenIdToken).cause).toBeInstanceOf(MatrixError);
      const mxError = (ex as Error).cause as MatrixError;
      expect(mxError.message).toEqual(
        "MatrixError: [500] Failed to look up user info from homeserver",
      );

      return;
    }
    expect.fail("Expected test to throw;");
  });

  it("should retry without delay params if the JWT service legacy endpoint returns M_BAD_JSON 400", async () => {
    let callCount = 0;

    fetchMock.post(
      "https://sfu.example.org/sfu/get",
      (url, opts) => {
        callCount++;
        const body = JSON.parse(opts.body as string);

        // First call: check if it has delay parts and return 400
        if (callCount === 1) {
          expect(body).toHaveProperty("delay_id", "mock_delay_id");
          return {
            status: 400,
            body: { errcode: "M_BAD_JSON", error: "Unsupported parameters" },
          };
        }

        // Second call: check if delay parts were stripped and return success
        expect(body).not.toHaveProperty("delay_id");
        expect(body).not.toHaveProperty("delay_timeout");
        expect(body).not.toHaveProperty("delay_cs_api_url");

        return {
          status: 200,
          body: { url: serviceUrl, jwt: testJWTToken },
        };
      },
      { overwriteRoutes: true },
    );

    // Note: Assuming getSFUConfig eventually calls getLiveKitJWT
    const config = await getSFUConfig({ ...params, ...delayParams });

    expect(config.jwt).toBe(testJWTToken);
    expect(callCount).toBe(2);
  });

  it("should successfully send delay parameters to the JWT service legacy endpoint", async () => {
    fetchMock.post(
      "https://sfu.example.org/sfu/get",
      (url, opts) => {
        const body = JSON.parse(opts.body as string);

        // Verify, that the request contains the expected delay parameters
        if (
          body.delay_id === "mock_delay_id" &&
          body.delay_timeout === 3600000 &&
          body.delay_cs_api_url === "https://matrix.homeserverserver.org"
        ) {
          return {
            status: 200,
            body: { url: serviceUrl, jwt: testJWTToken },
          };
        }
        return {
          status: 400,
          body: { error: "Missing expected delay params" },
        };
      },
      { overwriteRoutes: true },
    );

    const config = await getSFUConfig({ ...params, ...delayParams });

    // Prüfe das Ergebnis
    expect(config).toMatchObject({
      jwt: testJWTToken,
      url: serviceUrl,
    });
  });

  it("should use the default endpoint when subscribing", async () => {
    fetchMock.post("https://sfu.example.org/get_token", (url, opts) => {
      const body = JSON.parse(opts.body as string);
      expect(body).toMatchObject({
        room_id: "!example_room_id",
        slot_id: "m.call#ROOM",
        member: {
          id: ownMemberMock.memberId,
          claimed_user_id: ownMemberMock.userId,
          claimed_device_id: ownMemberMock.deviceId,
        },
      });
      return { status: 200, body: { url: serviceUrl, jwt: testJWTToken } };
    });
    const config = await getSFUConfig({ ...params, role: "subscriber" });
    expect(config.jwt).toBe(testJWTToken);
    expect(fetchMock.called("https://sfu.example.org/sfu/get")).toBe(false);
  });

  it("should fail when subscribing if the default endpoint is missing", async () => {
    // Nothing but the catch-all 404 answers the default endpoint. Subscribers
    // must not fall back to the legacy endpoint, which would hand them a
    // legacy identity.
    await expect(
      getSFUConfig({ ...params, role: "subscriber" }),
    ).rejects.toThrow(FailToGetOpenIdToken);
    expect(fetchMock.called("https://sfu.example.org/get_token")).toBe(true);
    expect(fetchMock.called("https://sfu.example.org/sfu/get")).toBe(false);
  });

  it("should retry fetching the openid token", async () => {
    let count = 0;
    matrixClient.getOpenIdToken.mockImplementation(async () => {
      count++;
      if (count < 2) {
        throw Error("Test failure");
      }
      return Promise.resolve({
        token_type: "Bearer",
        access_token: "foobar",
        matrix_server_name: "example.org",
        expires_in: 30,
      });
    });
    fetchMock.post("https://sfu.example.org/sfu/get", () => {
      return {
        status: 200,
        body: { url: serviceUrl, jwt: testJWTToken },
      };
    });
    const config = await getSFUConfig({ ...params, ...delayParams });
    expect(config).toEqual({
      jwt: testJWTToken,
      url: serviceUrl,
      livekitIdentity: "@me:example.org:ABCDEF",
      livekitAlias: "!example_room_id",
    });
  });
});