import { describe, expect, it } from "vitest";
import { reduceState, type SessionState } from "./session-manager.js";

describe("reduceState", () => {
  it("pending → connecting on starting", () => {
    expect(reduceState("pending", { kind: "starting" })).toBe<SessionState>("connecting");
  });
  it("connecting → connected on open", () => {
    expect(reduceState("connecting", { kind: "open" })).toBe<SessionState>("connected");
  });
  it("connected → disconnected on close (not logged out)", () => {
    expect(reduceState("connected", { kind: "close", loggedOut: false })).toBe<SessionState>(
      "disconnected",
    );
  });
  it("any → logged_out on logged-out close", () => {
    expect(reduceState("connected", { kind: "close", loggedOut: true })).toBe<SessionState>(
      "logged_out",
    );
    expect(reduceState("connecting", { kind: "close", loggedOut: true })).toBe<SessionState>(
      "logged_out",
    );
  });
  it("ignores stray events that don't match transitions", () => {
    expect(reduceState("connected", { kind: "starting" })).toBe<SessionState>("connected");
  });
});