import { describe, expect, it } from "vite-plus/test";import { EventId, type OrchestrationThreadActivity, TurnId } from "@t3tools/contracts"; import { deriveLatestContextWindowSnapshot, formatContextWindowTokens } from "./contextWindow"; function makeActivity(id: string, kind: string, payload: unknown): OrchestrationThreadActivity {  return {    id: EventId.make(id),    tone: "info",    kind,    summary: kind,    payload,    turnId: TurnId.make("turn-1"),    createdAt: "2026-03-23T00:00:00.000Z",  };} describe("contextWindow", () => {  it("derives the latest valid context window snapshot", () => {    const snapshot = deriveLatestContextWindowSnapshot([      makeActivity("activity-1", "context-window.updated", {        usedTokens: 1000,      }),      makeActivity("activity-2", "tool.started", {}),      makeActivity("activity-3", "context-window.updated", {        usedTokens: 14_000,        maxTokens: 258_000,        compactsAutomatically: true,      }),    ]);     expect(snapshot).not.toBeNull();    expect(snapshot?.usedTokens).toBe(14_000);    expect(snapshot?.totalProcessedTokens).toBeNull();    expect(snapshot?.maxTokens).toBe(258_000);    expect(snapshot?.compactsAutomatically).toBe(true);  });   it("ignores malformed payloads", () => {    const snapshot = deriveLatestContextWindowSnapshot([      makeActivity("activity-1", "context-window.updated", {}),    ]);     expect(snapshot).toBeNull();  });   it("keeps valid zero-usage snapshots", () => {    const snapshot = deriveLatestContextWindowSnapshot([      makeActivity("activity-1", "context-window.updated", {        usedTokens: 0,        maxTokens: 100_000,      }),    ]);     expect(snapshot).toMatchObject({      usedTokens: 0,      maxTokens: 100_000,      remainingTokens: 100_000,      usedPercentage: 0,      remainingPercentage: 100,    });  });   it("formats compact token counts", () => {    expect(formatContextWindowTokens(999)).toBe("999");    expect(formatContextWindowTokens(1400)).toBe("1.4k");    expect(formatContextWindowTokens(14_000)).toBe("14k");    expect(formatContextWindowTokens(258_000)).toBe("258k");  });   it("includes total processed tokens when available", () => {    const snapshot = deriveLatestContextWindowSnapshot([      makeActivity("activity-1", "context-window.updated", {        usedTokens: 81_659,        totalProcessedTokens: 748_126,        maxTokens: 258_400,        lastUsedTokens: 81_659,      }),    ]);     expect(snapshot?.usedTokens).toBe(81_659);    expect(snapshot?.totalProcessedTokens).toBe(748_126);  });});