// tests/lib/plan-review-dedup.test.mjs
// Cover lib/review/plan-review-dedup.mjs:
//   - identical findings dedupe to 1 (exact-id path)
//   - distinct findings stay separate
//   - jaccard threshold 0.7 catches near-duplicates
//   - empty / missing payloads tolerated
//   - CLI shim emits parseable JSON on stdout

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { execFileSync } from 'node:child_process';
import { writeFileSync, mkdtempSync, rmSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { tmpdir } from 'node:os';
import { fileURLToPath } from 'node:url';
import { dedupFindings, tokenize, DEFAULT_THRESHOLD } from '../../lib/review/plan-review-dedup.mjs';

const HERE = dirname(fileURLToPath(import.meta.url));
const SHIM = join(HERE, '..', '..', 'lib', 'review', 'plan-review-dedup.mjs');

function tmp(prefix = 'plan-review-dedup-') {
  return mkdtempSync(join(tmpdir(), prefix));
}

test('tokenize splits on non-word and lowercases', () => {
  assert.deepEqual(
    tokenize('Step 4 LACKS verifiable acceptance!'),
    ['step', '4', 'lacks', 'verifiable', 'acceptance'],
  );
  assert.deepEqual(tokenize(''), []);
  assert.deepEqual(tokenize(undefined), []);
});

test('DEFAULT_THRESHOLD is 0.7 per plan-v2 spec', () => {
  assert.equal(DEFAULT_THRESHOLD, 0.7);
});

test('identical findings (same file/line/rule_key) dedupe to 1, raised_by merged', () => {
  const sources = [
    { agent: 'plan-critic',    payload: { agent: 'plan-critic',    findings: [{ file: 'plan.md', line: 42, rule_key: 'PC1', text: 'Step 4 lacks verifiable acceptance criteria' }] } },
    { agent: 'scope-guardian', payload: { agent: 'scope-guardian', findings: [{ file: 'plan.md', line: 42, rule_key: 'PC1', text: 'Step 4 lacks verifiable acceptance criteria' }] } },
  ];
  const r = dedupFindings(sources);
  assert.equal(r.findings.length, 1);
  assert.deepEqual(r.findings[0].raised_by.sort(), ['plan-critic', 'scope-guardian']);
  assert.equal(r.dedup_stats.total_in, 2);
  assert.equal(r.dedup_stats.total_out, 1);
  assert.equal(r.dedup_stats.exact_id_dups, 1);
});

test('distinct findings (different file/line/rule_key) stay separate', () => {
  const sources = [
    { agent: 'plan-critic', payload: { findings: [
      { file: 'plan.md', line: 10, rule_key: 'PC1', text: 'thing one' },
      { file: 'plan.md', line: 20, rule_key: 'PC2', text: 'thing two unrelated entirely' },
    ] } },
  ];
  const r = dedupFindings(sources);
  assert.equal(r.findings.length, 2);
  assert.equal(r.dedup_stats.exact_id_dups, 0);
  assert.equal(r.dedup_stats.jaccard_dups, 0);
});

test('jaccard ≥ 0.7 on near-duplicate text merges (different file/line so id differs)', () => {
  const sources = [
    { agent: 'plan-critic',    payload: { findings: [{ file: 'plan.md', line: 10, rule_key: 'PC1', text: 'step lacks verifiable acceptance criteria for path A' }] } },
    { agent: 'scope-guardian', payload: { findings: [{ file: 'plan.md', line: 11, rule_key: 'SG1', text: 'step lacks verifiable acceptance criteria for path A' }] } },
  ];
  const r = dedupFindings(sources);
  assert.equal(r.findings.length, 1, 'jaccard merge should collapse near-duplicates');
  assert.deepEqual(r.findings[0].raised_by.sort(), ['plan-critic', 'scope-guardian']);
  assert.equal(r.dedup_stats.jaccard_dups, 1);
});

test('jaccard below threshold keeps both findings separate', () => {
  const sources = [
    { agent: 'plan-critic',    payload: { findings: [{ file: 'a.md', line: 1, rule_key: 'PC1', text: 'database migration risk' }] } },
    { agent: 'scope-guardian', payload: { findings: [{ file: 'b.md', line: 2, rule_key: 'SG1', text: 'unrelated frontend hover state polish' }] } },
  ];
  const r = dedupFindings(sources);
  assert.equal(r.findings.length, 2);
  assert.equal(r.dedup_stats.jaccard_dups, 0);
});

test('empty / missing payloads tolerated (single-agent input)', () => {
  const r = dedupFindings([
    { agent: 'plan-critic',    payload: { findings: [{ file: 'a.md', line: 1, rule_key: 'PC1', text: 'one' }] } },
    { agent: 'scope-guardian', payload: null },
  ]);
  assert.equal(r.findings.length, 1);
  assert.deepEqual(r.findings[0].raised_by, ['plan-critic']);
});

test('all sources empty → empty result, dedup_stats zeros', () => {
  const r = dedupFindings([
    { agent: 'plan-critic',    payload: null },
    { agent: 'scope-guardian', payload: { findings: [] } },
  ]);
  assert.equal(r.findings.length, 0);
  assert.equal(r.dedup_stats.total_in, 0);
  assert.equal(r.dedup_stats.total_out, 0);
});

test('CLI shim parses input files and emits valid deduped JSON', () => {
  const dir = tmp();
  try {
    const planCritic = join(dir, 'pc.json');
    const scopeGuardian = join(dir, 'sg.json');
    writeFileSync(planCritic, JSON.stringify({
      agent: 'plan-critic',
      findings: [{ file: 'plan.md', line: 5, rule_key: 'PC1', text: 'duplicate finding shared by both' }],
    }));
    writeFileSync(scopeGuardian, JSON.stringify({
      agent: 'scope-guardian',
      findings: [{ file: 'plan.md', line: 5, rule_key: 'PC1', text: 'duplicate finding shared by both' }],
    }));
    const out = execFileSync(process.execPath, [
      SHIM, '--plan-critic', planCritic, '--scope-guardian', scopeGuardian,
    ], { encoding: 'utf-8' });
    const parsed = JSON.parse(out);
    assert.equal(parsed.findings.length, 1);
    assert.deepEqual(parsed.findings[0].raised_by.sort(), ['plan-critic', 'scope-guardian']);
    assert.equal(parsed.dedup_stats.total_out, 1);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('CLI shim tolerates missing input files (returns empty deduped JSON)', () => {
  const out = execFileSync(process.execPath, [SHIM], { encoding: 'utf-8' });
  const parsed = JSON.parse(out);
  assert.equal(parsed.findings.length, 0);
  assert.equal(parsed.dedup_stats.total_in, 0);
});
