// tests/lib/verdict-gate.test.mjs
// K7 — the review verdict gate (ordre 5, P11). One command decides on the
// verdict written in review.md: 0 = ALLOW/WARN, 1 = BLOCK, 2 = could not read.
// Exit 2 is never green: a missing file, a missing verdict, or a verdict the
// file contradicts all land there.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { spawnSync } from 'node:child_process';
import { mkdtempSync, writeFileSync, rmSync, existsSync, symlinkSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..', '..');
const GATE = join(ROOT, 'lib', 'review', 'verdict-gate.mjs');
const { decideVerdict } = existsSync(GATE) ? await import('../../lib/review/verdict-gate.mjs') : {};

function review({ verdict, jsonVerdict, severities = [], allowBlockedBy = [] }) {
  const ids = severities.map((_, i) => String(i + 1).padStart(40, 'a'));
  const fmVerdict = verdict === undefined ? '' : `verdict: ${verdict}\n`;
  const findings = severities.map((s, i) => ({
    id: ids[i], severity: s, rule_key: 'MISSING_TEST', file: 'a.mjs', line: i + 1, title: 't', detail: 'd', recommended_action: 'Add a test.',
  }));
  const counts = { BLOCKER: 0, MAJOR: 0, MINOR: 0, SUGGESTION: 0 };
  for (const s of severities) counts[s] += 1;
  const json = JSON.stringify({ verdict: jsonVerdict ?? verdict, counts, allow_blocked_by: allowBlockedBy, findings }, null, 2);
  return `---
type: trekreview
review_version: "1.1"
task: "t"
slug: s
project_dir: .claude/projects/2026-10-06-s/
brief_path: .claude/projects/2026-10-06-s/brief.md
scope_sha_end: abc
reviewed_files_count: 1
${fmVerdict}findings:
${ids.map((id) => `  - ${id}`).join('\n')}
---

# Review: t

## Executive Summary

x

## Coverage

| File | Treatment | Reason |
|------|-----------|--------|
| a.mjs | summary-only | default |

## Remediation Summary

x

\`\`\`json
${json}
\`\`\`
`;
}

function runGate(text, { name = 'review.md', write = true } = {}) {
  const dir = mkdtempSync(join(tmpdir(), 'verdict-gate-'));
  try {
    const p = join(dir, name);
    if (write) writeFileSync(p, text);
    const r = spawnSync(process.execPath, [GATE, p], { encoding: 'utf-8' });
    return r;
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
}

test('verdict-gate — the CLI exists', () => {
  assert.ok(existsSync(GATE), 'lib/review/verdict-gate.mjs must exist (K7)');
});

test('verdict-gate — BLOCK → exit 1', () => {
  const r = runGate(review({ verdict: 'BLOCK', severities: ['BLOCKER'] }));
  assert.equal(r.status, 1, r.stdout + r.stderr);
});

test('verdict-gate — ALLOW → exit 0', () => {
  const r = runGate(review({ verdict: 'ALLOW', severities: ['MINOR'] }));
  assert.equal(r.status, 0, r.stdout + r.stderr);
});

test('verdict-gate — WARN → exit 0', () => {
  const r = runGate(review({ verdict: 'WARN', severities: ['MAJOR'] }));
  assert.equal(r.status, 0, r.stdout + r.stderr);
});

test('verdict-gate — missing file → exit 2', () => {
  const r = runGate('', { write: false });
  assert.equal(r.status, 2, r.stdout + r.stderr);
});

test('verdict-gate — a review.md without verdict → exit 2, never ALLOW', () => {
  const r = runGate(review({ verdict: undefined, jsonVerdict: 'ALLOW', severities: ['MINOR'] }));
  assert.equal(r.status, 2, r.stdout + r.stderr);
});

test('verdict-gate — an unknown verdict value → exit 2', () => {
  const r = runGate(review({ verdict: 'PASS', severities: ['MINOR'] }));
  assert.equal(r.status, 2, r.stdout + r.stderr);
});

test('verdict-gate — frontmatter ALLOW over a BLOCKER finding is a contradiction → exit 2', () => {
  const r = runGate(review({ verdict: 'ALLOW', severities: ['BLOCKER'] }));
  assert.equal(r.status, 2, r.stdout + r.stderr);
});

test('verdict-gate — frontmatter and trailing JSON disagree → exit 2', () => {
  const r = runGate(review({ verdict: 'WARN', jsonVerdict: 'BLOCK', severities: ['MAJOR'] }));
  assert.equal(r.status, 2, r.stdout + r.stderr);
});

test('verdict-gate — not a review (wrong type) → exit 2', () => {
  const r = runGate(review({ verdict: 'ALLOW', severities: ['MINOR'] }).replace('type: trekreview', 'type: trekbrief'));
  assert.equal(r.status, 2, r.stdout + r.stderr);
});

test('verdict-gate — --json prints the decision as JSON', () => {
  const dir = mkdtempSync(join(tmpdir(), 'verdict-gate-'));
  try {
    const p = join(dir, 'review.md');
    writeFileSync(p, review({ verdict: 'BLOCK', severities: ['BLOCKER'] }));
    const r = spawnSync(process.execPath, [GATE, '--json', p], { encoding: 'utf-8' });
    assert.equal(r.status, 1);
    const out = JSON.parse(r.stdout);
    assert.equal(out.verdict, 'BLOCK');
    assert.equal(out.exit, 1);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

// ---- Adversarial inputs (independent review of d88245c): each was exit 0 ----

function swapJson(text, jsonSrc) {
  return text.replace(/```json\n[\s\S]*?```\n$/, `\`\`\`json\n${jsonSrc}\n\`\`\`\n`);
}

test('verdict-gate — a greener verdict over a malformed or evasive JSON block is exit 2', () => {
  const base = review({ verdict: 'WARN', severities: ['MAJOR'] });
  assert.equal(decideVerdict(base).exit, 0, 'control: the untouched WARN review passes');
  const id = String(1).padStart(40, 'a');
  for (const json of [
    '{}',
    'null',
    `{"verdict":"WARN","counts":{"BLOCKER":0},"findings":[{"id":"${id}","severity":"blocker"}]}`,
    `{"verdict":"WARN","counts":{"blocker":1},"findings":[{"id":"${id}","severity":"MAJOR"}]}`,
    `{"verdict":"WARN","counts":{},"findings":{"${id}":{"severity":"BLOCKER"}}}`,
  ]) {
    assert.equal(decideVerdict(swapJson(base, json)).exit, 2, json);
  }
});

test('verdict-gate — the trailing json block must be the last fence', () => {
  const base = review({ verdict: 'WARN', severities: ['MAJOR'] });
  assert.equal(decideVerdict(`${base}\n\`\`\`json\n{"verdict":"WARN","counts":{},"findings":[]}\n\`\`\`\n`).exit, 2,
    'a later json fence cannot replace the real block');
  assert.equal(decideVerdict(base.replace(/```json\n(?=[\s\S]*```\n$)/, '```jsonc\n')).exit, 2,
    'a jsonc last fence is not the json block');
});

test('verdict-gate — a ## Findings (BLOCKER) entry under a WARN verdict is exit 2', () => {
  const base = review({ verdict: 'WARN', severities: ['MAJOR'] });
  const t = base.replace('## Coverage', '## Findings (BLOCKER)\n\n### deadbeef\n\n- file: a.mjs\n\n## Coverage');
  assert.equal(decideVerdict(t).exit, 2);
});

test('verdict-gate — two verdict lines in the frontmatter are exit 2', () => {
  const base = review({ verdict: 'ALLOW', severities: ['MINOR'] });
  assert.equal(decideVerdict(base.replace('verdict: ALLOW\n', 'verdict: BLOCK\nverdict: ALLOW\n')).exit, 2);
});

test('verdict-gate — frontmatter finding ids that differ from the JSON block are exit 2', () => {
  const base = review({ verdict: 'WARN', severities: ['MAJOR'] });
  const t = base.replace(`  - ${String(1).padStart(40, 'a')}`, `  - ${'b'.repeat(40)}`);
  assert.equal(decideVerdict(t).exit, 2);
});

// ---- Operator decision 2026-10-06: a control that did not run stops a merge ----

test('verdict-gate — WARN because a reviewer or engine did not run is exit 2, not a passable warning', () => {
  for (const reason of ['missing-reviewer:claude-security-review', 'unattributable-payload (1)']) {
    const t = review({ verdict: 'WARN', severities: ['MINOR'], allowBlockedBy: [reason] });
    const d = decideVerdict(t);
    assert.equal(d.exit, 2, reason);
    assert.match(d.reason, /did not run/);
  }
});

test('verdict-gate — WARN for a set-aside finding or a MAJOR still passes (exit 0) with its reasons', () => {
  const d = decideVerdict(review({ verdict: 'WARN', severities: ['MAJOR'], allowBlockedBy: ['unverified:actionability:empty (1)'] }));
  assert.equal(d.exit, 0);
  assert.deepEqual(d.warn_reasons, ['unverified:actionability:empty (1)']);
});

test('verdict-gate — a 1.1 review whose JSON block lacks allow_blocked_by cannot pass', () => {
  const base = review({ verdict: 'WARN', severities: ['MAJOR'] });
  const t = base.replace(/\s*"allow_blocked_by": \[\],?/, '');
  assert.notEqual(t, base, 'fixture control');
  assert.equal(decideVerdict(t).exit, 2);
});

test('verdict-gate — more than one file argument is refused (exit 2), never a first-match decision', () => {
  const dir = mkdtempSync(join(tmpdir(), 'verdict-gate-'));
  try {
    const a = join(dir, 'a.md');
    const b = join(dir, 'b.md');
    writeFileSync(a, review({ verdict: 'ALLOW', severities: ['MINOR'] }));
    writeFileSync(b, review({ verdict: 'BLOCK', severities: ['BLOCKER'] }));
    const r = spawnSync(process.execPath, [GATE, a, b], { encoding: 'utf-8' });
    assert.equal(r.status, 2);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('verdict-gate — run through a symlink and a path with a space it still decides (realpath main guard)', () => {
  // The old `file://${argv[1]}` guard is a no-op under a symlink or a space:
  // the CLI would exit 0 without reading anything — a silent green.
  const dir = mkdtempSync(join(tmpdir(), 'verdict gate '));
  try {
    const link = join(dir, 'gate link.mjs');
    symlinkSync(GATE, link);
    const p = join(dir, 'my review.md');
    writeFileSync(p, review({ verdict: 'BLOCK', severities: ['BLOCKER'] }));
    const r = spawnSync(process.execPath, [link, p], { encoding: 'utf-8' });
    assert.equal(r.status, 1, r.stdout + r.stderr);
    assert.match(r.stdout, /BLOCK/);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});