import { describe, it, expect, beforeEach } from "vitest";
import { SessionManager } from "../../src/session-manager.js";

describe("SessionManager", () => {
  let manager: SessionManager;

  beforeEach(() => {
    manager = new SessionManager();
  });

  it("returns undefined for unknown channel", () => {
    expect(manager.getSessionId("unknown")).toBeUndefined();
  });

  it("stores and retrieves a session", () => {
    manager.setSessionId("ch-1", "sess-abc");
    expect(manager.getSessionId("ch-1")).toBe("sess-abc");
  });

  it("overwrites an existing session", () => {
    manager.setSessionId("ch-1", "sess-old");
    manager.setSessionId("ch-1", "sess-new");
    expect(manager.getSessionId("ch-1")).toBe("sess-new");
  });

  it("removes a session", () => {
    manager.setSessionId("ch-1", "sess-abc");
    manager.removeSession("ch-1");
    expect(manager.getSessionId("ch-1")).toBeUndefined();
  });

  it("removeSession on unknown channel is a no-op", () => {
    expect(() => manager.removeSession("nope")).not.toThrow();
  });

  it("clear removes all sessions", () => {
    manager.setSessionId("ch-1", "s1");
    manager.setSessionId("ch-2", "s2");
    manager.clear();
    expect(manager.getSessionId("ch-1")).toBeUndefined();
    expect(manager.getSessionId("ch-2")).toBeUndefined();
  });

  it("isolates sessions across channels", () => {
    manager.setSessionId("ch-1", "s1");
    manager.setSessionId("ch-2", "s2");
    expect(manager.getSessionId("ch-1")).toBe("s1");
    expect(manager.getSessionId("ch-2")).toBe("s2");
    manager.removeSession("ch-1");
    expect(manager.getSessionId("ch-2")).toBe("s2");
  });
});