import {
  actionCreators as ac,
  actionTypes as at,
} from "common/Actions.sys.mjs";
import { DetectUserSessionStart } from "content-src/lib/detect-user-session-start";

describe("detectUserSessionStart", () => {
  let store;
  class PerfService {
    getMostRecentAbsMarkStartByName() {
      return 1234;
    }
    mark() {}
  }

  beforeEach(() => {
    store = { dispatch: () => {} };
  });
  describe("#sendEventOrAddListener", () => {
    it("should call ._sendEvent immediately if the document is visible", () => {
      const mockDocument = { visibilityState: "visible" };
      const instance = new DetectUserSessionStart(store, {
        document: mockDocument,
      });
      sinon.stub(instance, "_sendEvent");

      instance.sendEventOrAddListener();

      assert.calledOnce(instance._sendEvent);
    });
    it("should add an event listener on visibility changes the document is not visible", () => {
      const mockDocument = {
        visibilityState: "hidden",
        addEventListener: sinon.spy(),
      };
      const instance = new DetectUserSessionStart(store, {
        document: mockDocument,
      });
      sinon.stub(instance, "_sendEvent");

      instance.sendEventOrAddListener();

      assert.notCalled(instance._sendEvent);
      assert.calledWith(
        mockDocument.addEventListener,
        "visibilitychange",
        instance._onVisibilityChange
      );
    });
  });
  describe("#_sendEvent", () => {
    it("should dispatch an action with the SAVE_SESSION_PERF_DATA", () => {
      const dispatch = sinon.spy(store, "dispatch");
      const instance = new DetectUserSessionStart(store);

      instance._sendEvent();

      assert.calledWith(
        dispatch,
        ac.AlsoToMain({
          type: at.SAVE_SESSION_PERF_DATA,
          data: { visibility_event_rcvd_ts: sinon.match.number },
        })
      );
    });

    it("shouldn't send a message if getMostRecentAbsMarkStartByName throws", () => {
      let perfService = new PerfService();
      sinon.stub(perfService, "getMostRecentAbsMarkStartByName").throws();
      const dispatch = sinon.spy(store, "dispatch");
      const instance = new DetectUserSessionStart(store, { perfService });

      instance._sendEvent();

      assert.notCalled(dispatch);
    });

    it('should call perfService.mark("visibility_event_rcvd_ts")', () => {
      let perfService = new PerfService();
      sinon.stub(perfService, "mark");
      const instance = new DetectUserSessionStart(store, { perfService });

      instance._sendEvent();

      assert.calledWith(perfService.mark, "visibility_event_rcvd_ts");
    });
  });

  describe("_onVisibilityChange", () => {
    it("should not send an event if visiblity is not visible", () => {
      const instance = new DetectUserSessionStart(store, {
        document: { visibilityState: "hidden" },
      });
      sinon.stub(instance, "_sendEvent");

      instance._onVisibilityChange();

      assert.notCalled(instance._sendEvent);
    });
    it("should send an event and remove the event listener if visibility is visible", () => {
      const mockDocument = {
        visibilityState: "visible",
        removeEventListener: sinon.spy(),
      };
      const instance = new DetectUserSessionStart(store, {
        document: mockDocument,
      });
      sinon.stub(instance, "_sendEvent");

      instance._onVisibilityChange();

      assert.calledOnce(instance._sendEvent);
      assert.calledWith(
        mockDocument.removeEventListener,
        "visibilitychange",
        instance._onVisibilityChange
      );
    });
  });
});
