import { test } from "node:test";
import assert from "node:assert/strict";
import { MCP_POLICY, VIEWER_POLICY } from "./policy";
import { truncate } from "./window";

// These four numbers are a wire contract with the bench: the MCP scanner's
// structural read/byte counters are unchanged by the one-pipeline move ONLY
// because the caps travel as data rather than being re-derived. If one of them
// moves, the bench's page counts move with it, so pin them.
test("MCP_POLICY carries the MCP scanner's four caps verbatim", () => {
  assert.equal(MCP_POLICY.maxPages, 400);
  assert.equal(MCP_POLICY.hardVideoCap, 2000);
  assert.equal(MCP_POLICY.windowLineCap, 200);
  assert.equal(MCP_POLICY.snippetChars, 240);
});

test("VIEWER_POLICY is uncapped, and Infinity behaves as the identity", () => {
  assert.equal(VIEWER_POLICY.maxPages, Number.POSITIVE_INFINITY);
  assert.equal(VIEWER_POLICY.hardVideoCap, Number.POSITIVE_INFINITY);
  assert.equal(VIEWER_POLICY.windowLineCap, Number.POSITIVE_INFINITY);
  // The load-bearing consequence: a viewer excerpt is never clipped.
  const long = "x".repeat(5000);
  assert.equal(truncate(long, VIEWER_POLICY.snippetChars), long);
  // …and 0 pages scanned is never "at the cap".
  assert.equal(0 >= VIEWER_POLICY.maxPages, false);
});