import assert from "node:assert/strict";
import test from "node:test";

import { consultationHistoryFromStoredMessages } from "../src/lib/consultation-session-history.ts";

test("stored consultation history keeps the last 12 role/text pairs and clips text", () => {
  const history = consultationHistoryFromStoredMessages([
    { role: "system", text: "ignore" },
    { role: "user", text: "first" },
    ...Array.from({ length: 12 }, (_, index) => ({
      role: index % 2 === 0 ? "assistant" : "user",
      text: `keep-${index}`,
      requestId: `req-${index}`,
    })),
    { role: "assistant", text: "x".repeat(4001), thinkingText: "secret" },
  ]);

  assert.equal(history.length, 12);
  assert.equal(history[0]?.text, "keep-1");
  assert.equal(history.at(-1)?.text.length, 4000);
  assert.deepEqual(history.at(-2), { role: "user", text: "keep-11" });
});

test("stored consultation history can skip the in-flight request id", () => {
  const history = consultationHistoryFromStoredMessages([
    { role: "user", text: "old", requestId: "keep" },
    { role: "user", text: "current", requestId: "skip" },
  ], { excludeRequestId: "skip" });

  assert.deepEqual(history, [{ role: "user", text: "old" }]);
});