// Tests for the pure halves of the skill trigger eval (#2163).
//
// Everything else in `skill-eval.mjs` spawns a real `claude` CLI, so its stream
// parsing and its process-outcome handling are unreachable from an eval run's
// happy path — they would only ever be exercised by the very measurement they
// are supposed to make trustworthy. A nonzero exit read as "no skill invoked"
// (the bug these cases pin) passes every negative case and reads as a trigger
// miss on every positive one, so a rate-limited run reports a plausible number
// instead of failing.

import { test } from "node:test";
import assert from "node:assert/strict";
import { collectSkillInvocations, sampleHit } from "./skill-eval.mjs";

const assistant = (...blocks) =>
  JSON.stringify({ type: "assistant", message: { content: blocks } });
const skillUse = (name) => ({
  type: "tool_use",
  name: "Skill",
  input: { skill: name },
});

test("collectSkillInvocations finds Skill tool_use payloads", () => {
  const { invoked } = collectSkillInvocations(
    assistant(skillUse("testing")) + "\n",
  );
  assert.equal(invoked.size, 1);
  assert.ok([...invoked][0].includes("testing"));
});

test("collectSkillInvocations ignores other tools and other event types", () => {
  const text =
    assistant({ type: "tool_use", name: "Read", input: { file_path: "a" } }) +
    "\n" +
    JSON.stringify({ type: "result", result: "Skill" }) +
    "\n";
  assert.equal(collectSkillInvocations(text).invoked.size, 0);
});

test("collectSkillInvocations survives malformed and blank lines", () => {
  const text = "not json\n\n" + assistant(skillUse("local-dev")) + "\n";
  const { invoked } = collectSkillInvocations(text);
  assert.equal(invoked.size, 1);
});

test("collectSkillInvocations holds back a trailing partial line", () => {
  const whole = assistant(skillUse("local-dev"));
  const first = collectSkillInvocations(whole.slice(0, 20));
  assert.equal(first.invoked.size, 0);
  assert.equal(first.rest, whole.slice(0, 20));
  // Feeding the remainder back with the held-over prefix completes the event.
  const second = collectSkillInvocations(first.rest + whole.slice(20) + "\n");
  assert.equal(second.invoked.size, 1);
});

test("collectSkillInvocations tolerates a tool_use with no input", () => {
  const text = assistant({ type: "tool_use", name: "Skill" }) + "\n";
  assert.deepEqual([...collectSkillInvocations(text).invoked], ["{}"]);
});

test("sampleHit scores positive and negative cases", () => {
  const fired = new Set(['{"skill":"testing"}']);
  const none = new Set();
  assert.equal(sampleHit("testing", fired), true);
  assert.equal(sampleHit("local-dev", fired), false);
  assert.equal(sampleHit(null, none), true);
  assert.equal(sampleHit(null, fired), false);
  assert.equal(sampleHit("testing", none), false);
});