// tests/synthetic/review-determinism.test.mjs
// SC7 review-determinism floor — Jaccard pipeline test.
//
// Reads two synthetic review-run fixtures and asserts that
// jaccardSimilarity(findingTokens(reviewA), findingTokens(reviewB)) >= 0.833.
//
// This is the SC7 (higher) floor. The companion
// tests/lib/review-determinism.test.mjs holds the SC4 (0.70) floor against
// tests/fixtures/trekreview/. Both pairs coexist on purpose: the lower
// floor protects against pipeline regressions, the higher one anchors the
// determinism aspiration set in the speedup brief.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { readFileSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';
import { jaccardSimilarity } from '../../lib/parsers/jaccard.mjs';
import { parseFindingId } from '../../lib/parsers/finding-id.mjs';
import { parseDocument } from '../../lib/util/frontmatter.mjs';

const HERE = dirname(fileURLToPath(import.meta.url));
const ROOT = join(HERE, '..', '..');

const SC7_THRESHOLD = 0.833;

function loadFindings(rel) {
  const text = readFileSync(join(ROOT, rel), 'utf-8');
  const doc = parseDocument(text);
  assert.ok(doc.valid, `frontmatter of ${rel} did not parse: ${(doc.errors || []).map(e => e.message).join(', ')}`);
  const findings = doc.parsed.frontmatter && doc.parsed.frontmatter.findings;
  assert.ok(Array.isArray(findings), `frontmatter.findings of ${rel} is not an array`);
  return findings;
}

test('review determinism — Jaccard of synthetic review-run-A vs review-run-B meets SC7 threshold (0.833)', () => {
  const a = loadFindings('tests/synthetic/review-run-A.md');
  const b = loadFindings('tests/synthetic/review-run-B.md');
  const sim = jaccardSimilarity(a, b);
  assert.ok(
    sim >= SC7_THRESHOLD,
    `jaccardSimilarity(findingTokens(reviewA), findingTokens(reviewB)) = ${sim} < ${SC7_THRESHOLD} (SC7 floor). ` +
    `Fixtures may have drifted — recompute IDs via lib/parsers/finding-id.mjs.`,
  );
});

test('review determinism — finding IDs are 40-char hex (parseFindingId valid)', () => {
  for (const rel of ['tests/synthetic/review-run-A.md', 'tests/synthetic/review-run-B.md']) {
    const findings = loadFindings(rel);
    for (const id of findings) {
      const parsed = parseFindingId(id);
      assert.ok(
        parsed.valid,
        `${rel}: ID ${JSON.stringify(id)} is not a 40-char lowercase hex string (parseFindingId rejected it)`,
      );
    }
  }
});

test('review determinism — both fixtures contain at least 25 unique finding-IDs', () => {
  for (const rel of ['tests/synthetic/review-run-A.md', 'tests/synthetic/review-run-B.md']) {
    const findings = loadFindings(rel);
    assert.ok(
      new Set(findings).size >= 25,
      `${rel}: < 25 unique finding-IDs (got ${new Set(findings).size}). Synthetic fixtures must reflect a substantial review.`,
    );
  }
});

test('review determinism — no duplicate IDs within run', () => {
  for (const rel of ['tests/synthetic/review-run-A.md', 'tests/synthetic/review-run-B.md']) {
    const findings = loadFindings(rel);
    assert.strictEqual(
      new Set(findings).size,
      findings.length,
      `${rel}: contains duplicate finding-IDs (${findings.length} entries vs ${new Set(findings).size} unique)`,
    );
  }
});