import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { execFileSync } from 'node:child_process';
import { mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { validateBriefContent } from '../../lib/validators/brief-validator.mjs';

const GOOD_BRIEF = `---
type: trekbrief
brief_version: "2.0"
created: 2026-04-30
task: "Add JWT auth to API"
slug: jwt-auth
project_dir: .claude/projects/2026-04-30-jwt-auth/
research_topics: 2
research_status: pending
auto_research: false
interview_turns: 5
source: interview
---

# Task: JWT auth

## Intent

Why this matters.

## Goal

What success looks like.

## Success Criteria

- All tests pass.
`;

test('validateBrief — happy path', () => {
  const r = validateBriefContent(GOOD_BRIEF, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
});

test('validateBrief — wrong type rejected', () => {
  const t = GOOD_BRIEF.replace('type: trekbrief', 'type: notabrief');
  const r = validateBriefContent(t);
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_WRONG_TYPE'));
});

test('validateBrief — missing required field', () => {
  const t = GOOD_BRIEF.replace(/^research_topics: 2\n/m, '');
  const r = validateBriefContent(t);
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_MISSING_FIELD' && /research_topics/.test(e.message)));
});

test('validateBrief — bad research_status value', () => {
  const t = GOOD_BRIEF.replace('research_status: pending', 'research_status: maybe');
  const r = validateBriefContent(t);
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_BAD_STATUS'));
});

test('validateBrief — state machine: research_topics > 0 + skipped without partial = error', () => {
  const t = GOOD_BRIEF.replace('research_status: pending', 'research_status: skipped');
  const r = validateBriefContent(t);
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_STATE_INCOHERENT'));
});

test('validateBrief — state machine: skipped + brief_quality: partial = warning only', () => {
  const t = GOOD_BRIEF
    .replace('research_status: pending', 'research_status: skipped')
    .replace('source: interview', 'source: interview\nbrief_quality: partial');
  const r = validateBriefContent(t);
  assert.equal(r.valid, true, JSON.stringify(r.errors));
  assert.ok(r.warnings.find(w => w.code === 'BRIEF_PARTIAL_SKIPPED'));
});

test('validateBrief — strict requires body sections', () => {
  const t = GOOD_BRIEF.replace(/## Intent\n\nWhy this matters\.\n\n/, '');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_MISSING_SECTION'));
});

test('validateBrief — soft demotes section errors to warnings', () => {
  const t = GOOD_BRIEF.replace(/## Goal\n\nWhat success looks like\.\n\n/, '');
  const r = validateBriefContent(t, { strict: false });
  assert.equal(r.valid, true);
  assert.ok(r.warnings.find(w => w.code === 'BRIEF_MISSING_SECTION'));
});

test('validateBrief — missing frontmatter is hard error', () => {
  const r = validateBriefContent('# just markdown\n\nno frontmatter\n');
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'FM_MISSING'));
});

const REVIEW_AS_BRIEF = `---
type: trekreview
task: "Review delivered trekreview v1.0"
slug: trekreview
project_dir: .claude/projects/2026-05-01-trekreview/
findings:
  - 0123456789abcdef0123456789abcdef01234567
  - fedcba9876543210fedcba9876543210fedcba98
---

# Review brief

## Intent

Adversarial review of delivered trekreview v1.0.

## Goal

Find what was missed.

## Success Criteria

- All BLOCKER findings get a fix-plan.
`;

test('validateBrief — trekreview type accepted with findings array', () => {
  const r = validateBriefContent(REVIEW_AS_BRIEF, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
});

test('validateBrief — trekreview without findings rejected (BRIEF_MISSING_FIELD)', () => {
  const t = REVIEW_AS_BRIEF.replace(/findings:\n  - 0123[\s\S]*?- fedcba[0-9a-f]+\n/, '');
  const r = validateBriefContent(t);
  assert.equal(r.valid, false);
  assert.ok(
    r.errors.find(e => e.code === 'BRIEF_MISSING_FIELD' && /findings/.test(e.message)),
    `expected BRIEF_MISSING_FIELD for findings; got ${JSON.stringify(r.errors)}`,
  );
});

test('validateBrief — trekreview with findings as scalar (not array) rejected (BRIEF_BAD_FINDINGS_TYPE)', () => {
  const t = REVIEW_AS_BRIEF.replace(
    /findings:\n  - 0123[\s\S]*?- fedcba[0-9a-f]+/,
    'findings: not-an-array',
  );
  const r = validateBriefContent(t);
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_BAD_FINDINGS_TYPE'));
});

test('validateBrief — wrong-type error message includes accepted set', () => {
  const t = REVIEW_AS_BRIEF.replace('type: trekreview', 'type: somethingelse');
  const r = validateBriefContent(t);
  assert.equal(r.valid, false);
  const wrongType = r.errors.find(e => e.code === 'BRIEF_WRONG_TYPE');
  assert.ok(wrongType);
  assert.ok(/trekbrief/.test(wrongType.message));
  assert.ok(/trekreview/.test(wrongType.message));
});

// --- v5.1 — phase_signals additive field + sequencing gate ---

const SIGNALS_BLOCK = `phase_signals:
  - phase: research
    effort: standard
  - phase: plan
    effort: high
    model: opus
  - phase: execute
    effort: low
    model: sonnet
  - phase: review
    effort: standard
`;

test('validateBrief — v5.1 well-formed phase_signals accepted', () => {
  const t = GOOD_BRIEF
    .replace('brief_version: "2.0"', 'brief_version: "2.1"')
    .replace('source: interview\n', `source: interview\n${SIGNALS_BLOCK}`);
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
});

test('validateBrief — pre-v5.1 brief without phase_signals accepted (backward-compat)', () => {
  const r = validateBriefContent(GOOD_BRIEF, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
  assert.ok(!r.errors.find(e => e.code === 'BRIEF_V51_MISSING_SIGNALS'));
});

test('validateBrief — v5.1+ brief missing phase_signals + partial emits BRIEF_V51_MISSING_SIGNALS', () => {
  const t = GOOD_BRIEF.replace('brief_version: "2.0"', 'brief_version: "2.1"');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_V51_MISSING_SIGNALS'));
});

test('validateBrief — v5.1+ brief with phase_signals_partial: true accepted', () => {
  const t = GOOD_BRIEF
    .replace('brief_version: "2.0"', 'brief_version: "2.1"')
    .replace('source: interview\n', 'source: interview\nphase_signals_partial: true\n');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
});

test('validateBrief — phase_signals + phase_signals_partial both set rejected (mutually exclusive)', () => {
  const t = GOOD_BRIEF
    .replace('brief_version: "2.0"', 'brief_version: "2.1"')
    .replace('source: interview\n', `source: interview\nphase_signals_partial: true\n${SIGNALS_BLOCK}`);
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_SIGNALS_MUTUALLY_EXCLUSIVE'));
});

test('validateBrief — phase_signals with unknown phase rejected', () => {
  const BAD_SIGNALS = `phase_signals:
  - phase: nonsense
    effort: standard
`;
  const t = GOOD_BRIEF
    .replace('brief_version: "2.0"', 'brief_version: "2.1"')
    .replace('source: interview\n', `source: interview\n${BAD_SIGNALS}`);
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_INVALID_PHASE_SIGNAL_PHASE'));
});

// --- v5.1.1 regression: YAML-number bypass closed ---
// Findings 3c834097 + df1435a2: v5.1.0 shipped with an unquoted `brief_version: 2.1`
// template. parseScalar coerces unquoted "2.1" to Number 2.1, and the original gate
// guarded `typeof === 'string'`, silently bypassing the sequencing check. v5.1.1
// coerces via String() so both shapes trigger the gate.

test('validateBrief — v5.1.1: UNQUOTED brief_version 2.1 without signals triggers gate', () => {
  const t = GOOD_BRIEF.replace('brief_version: "2.0"', 'brief_version: 2.1');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(
    r.errors.find(e => e.code === 'BRIEF_V51_MISSING_SIGNALS'),
    `gate must fire for unquoted brief_version: 2.1 (YAML Number); errors=${JSON.stringify(r.errors)}`,
  );
});

test('validateBrief — v5.1.1: QUOTED brief_version "2.1" without signals triggers gate (regression guard)', () => {
  const t = GOOD_BRIEF.replace('brief_version: "2.0"', 'brief_version: "2.1"');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_V51_MISSING_SIGNALS'));
});

test('validateBrief — v5.1.1: UNQUOTED brief_version 2.1 WITH phase_signals is valid (positive case)', () => {
  const t = GOOD_BRIEF
    .replace('brief_version: "2.0"', 'brief_version: 2.1')
    .replace('source: interview\n', `source: interview\n${SIGNALS_BLOCK}`);
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
  assert.ok(!r.errors.find(e => e.code === 'BRIEF_V51_MISSING_SIGNALS'));
});

// --- v5.9 — fable model tier (BASE_ALLOWED_MODELS widened to three values) ---

test('validateBrief — v5.9: fable phase_signals fixture accepted (no BRIEF_INVALID_MODEL)', () => {
  const t = readFileSync(new URL('../fixtures/brief-effort-fable.md', import.meta.url), 'utf-8');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
  assert.ok(!r.errors.find(e => e.code === 'BRIEF_INVALID_MODEL'));
});

test('validateBrief — v5.9: unknown model gpt5 in phase_signals rejected with BRIEF_INVALID_MODEL', () => {
  const t = GOOD_BRIEF
    .replace('brief_version: "2.0"', 'brief_version: "2.1"')
    .replace('source: interview\n', `source: interview\n${SIGNALS_BLOCK.replace('model: opus', 'model: gpt5')}`);
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_INVALID_MODEL'),
    `expected BRIEF_INVALID_MODEL for gpt5, got: ${JSON.stringify(r.errors)}`);
});

// --- v5.5 — framing enforcement + obligatory TL;DR (gated at brief_version ≥ 2.2) ---
// Operator decision (S6, option A1): framing + TL;DR are hard BLOCKERs for briefs
// declaring brief_version ≥ 2.2; existing 2.0/2.1 briefs stay valid (forward-compat,
// mirroring the phase_signals ≥ 2.1 precedent). The framing ENUM check fires on any
// version when the field is present but malformed.

const GOOD_BRIEF_22 = `---
type: trekbrief
brief_version: "2.2"
created: 2026-06-18
task: "Add JWT auth to API"
slug: jwt-auth
project_dir: .claude/projects/2026-06-18-jwt-auth/
research_topics: 0
research_status: complete
auto_research: false
interview_turns: 5
source: interview
framing: new-direction
phase_signals_partial: true
---

# Task: JWT auth

## TL;DR

Net-new JWT auth; no prior brief to anchor against.

## Intent

Why this matters.

## Goal

What success looks like.

## Success Criteria

- All tests pass.
`;

test('validateBrief — v5.5 well-formed 2.2 brief (framing + TL;DR) accepted', () => {
  const r = validateBriefContent(GOOD_BRIEF_22, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
});

test('validateBrief — v5.5 framing enum: invalid value rejected on any version', () => {
  const t = GOOD_BRIEF.replace('source: interview\n', 'source: interview\nframing: sideways\n');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_INVALID_FRAMING'));
});

test('validateBrief — v5.5 framing enum: all four canonical values accepted', () => {
  for (const v of ['preserve', 'refine', 'replace', 'new-direction']) {
    const t = GOOD_BRIEF_22.replace('framing: new-direction', `framing: ${v}`);
    const r = validateBriefContent(t, { strict: true });
    assert.equal(r.valid, true, `framing=${v}: ${JSON.stringify(r.errors)}`);
  }
});

test('validateBrief — v5.5 brief_version 2.2 missing framing rejected (BRIEF_MISSING_FRAMING)', () => {
  const t = GOOD_BRIEF_22.replace('framing: new-direction\n', '');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_MISSING_FRAMING'));
});

test('validateBrief — v5.5 brief_version 2.2 missing ## TL;DR rejected (strict)', () => {
  const t = GOOD_BRIEF_22.replace(/## TL;DR\n\n[^\n]*\n\n/, '');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'BRIEF_MISSING_SECTION' && /TL;DR/.test(e.message)));
});

test('validateBrief — v5.5 brief_version 2.2 missing ## TL;DR demoted to warning (soft)', () => {
  const t = GOOD_BRIEF_22.replace(/## TL;DR\n\n[^\n]*\n\n/, '');
  const r = validateBriefContent(t, { strict: false });
  assert.ok(r.warnings.find(w => w.code === 'BRIEF_MISSING_SECTION' && /TL;DR/.test(w.message)));
});

test('validateBrief — v5.5 TL;DR exceeding 5 lines emits BRIEF_TLDR_TOO_LONG warning', () => {
  const longTldr = ['l1', 'l2', 'l3', 'l4', 'l5', 'l6'].join('\n');
  const t = GOOD_BRIEF_22.replace('Net-new JWT auth; no prior brief to anchor against.', longTldr);
  const r = validateBriefContent(t, { strict: true });
  assert.ok(
    r.warnings.find(w => w.code === 'BRIEF_TLDR_TOO_LONG'),
    `expected TL;DR-too-long warning; warnings=${JSON.stringify(r.warnings)}`,
  );
});

test('validateBrief — v5.5 backward-compat: 2.1 brief without framing/TL;DR stays valid', () => {
  const t = GOOD_BRIEF
    .replace('brief_version: "2.0"', 'brief_version: "2.1"')
    .replace('source: interview\n', 'source: interview\nphase_signals_partial: true\n');
  const r = validateBriefContent(t, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
  assert.ok(!r.errors.find(e => e.code === 'BRIEF_MISSING_FRAMING'));
  assert.ok(!r.errors.find(e => e.code === 'BRIEF_MISSING_SECTION' && /TL;DR/.test(e.message)));
});

test('validateBrief — v5.5 trekreview brief not subject to framing/TL;DR gate', () => {
  const r = validateBriefContent(REVIEW_AS_BRIEF, { strict: true });
  assert.equal(r.valid, true, JSON.stringify(r.errors));
  assert.ok(!r.errors.find(e => e.code === 'BRIEF_MISSING_FRAMING'));
  assert.ok(!r.errors.find(e => e.code === 'BRIEF_MISSING_SECTION' && /TL;DR/.test(e.message)));
});

// S18 — opt-in --min-brief-version gate. Warns (never blocks) when a brief
// declares a version below the caller's floor, sidestepping framing enforcement.
const BRIEF_21 = GOOD_BRIEF
  .replace('brief_version: "2.0"', 'brief_version: "2.1"')
  .replace('source: interview\n', 'source: interview\nphase_signals_partial: true\n');

test('validateBrief — S18 min-version: older brief below floor warns but does not block', () => {
  const r = validateBriefContent(BRIEF_21, { strict: true, minBriefVersion: '2.2' });
  assert.equal(r.valid, true, `must warn, not block: ${JSON.stringify(r.errors)}`);
  assert.ok(
    r.warnings.find(w => w.code === 'BRIEF_VERSION_BELOW_MINIMUM'),
    `expected BRIEF_VERSION_BELOW_MINIMUM; warnings=${JSON.stringify(r.warnings)}`,
  );
});

test('validateBrief — S18 min-version: absent opt means no version-floor check', () => {
  const r = validateBriefContent(BRIEF_21, { strict: true });
  assert.ok(!r.warnings.find(w => w.code === 'BRIEF_VERSION_BELOW_MINIMUM'));
});

test('validateBrief — S18 min-version: brief meeting the floor does not warn', () => {
  const r = validateBriefContent(GOOD_BRIEF_22, { strict: true, minBriefVersion: '2.2' });
  assert.ok(!r.warnings.find(w => w.code === 'BRIEF_VERSION_BELOW_MINIMUM'));
});

test('validateBrief — S18 min-version: 2.0 brief below 2.2 floor warns', () => {
  const r = validateBriefContent(GOOD_BRIEF, { minBriefVersion: '2.2' });
  assert.ok(r.warnings.find(w => w.code === 'BRIEF_VERSION_BELOW_MINIMUM'));
});

test('validateBrief — S18 min-version: trekreview brief is exempt (no framing to bypass)', () => {
  const r = validateBriefContent(REVIEW_AS_BRIEF, { minBriefVersion: '2.2' });
  assert.ok(!r.warnings.find(w => w.code === 'BRIEF_VERSION_BELOW_MINIMUM'));
});

// S56 — CLI arg-parsing regression. The no-flag invocation `brief-validator.mjs <brief.md>`
// used to bail to Usage/exit 2 because the --min-version skip index was 0 when the flag
// was absent, dropping the file positional (which sits at argv index 0).
test('CLI — no-flag invocation reaches validation, does not bail to Usage (S56 regression)', () => {
  const dir = mkdtempSync(join(tmpdir(), 'brief-cli-'));
  try {
    const file = join(dir, 'brief.md');
    writeFileSync(file, GOOD_BRIEF);
    // execFileSync throws on non-zero exit; pre-fix this bailed to Usage (exit 2).
    const out = execFileSync(process.execPath, [
      'lib/validators/brief-validator.mjs',
      file,
    ], { encoding: 'utf-8' });
    assert.match(out, /PASS/);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('CLI — --min-version still locates the file positional after the value token (S56)', () => {
  const dir = mkdtempSync(join(tmpdir(), 'brief-cli-'));
  try {
    const file = join(dir, 'brief.md');
    writeFileSync(file, GOOD_BRIEF);
    const out = execFileSync(process.execPath, [
      'lib/validators/brief-validator.mjs',
      '--min-version', '2.0',
      file,
    ], { encoding: 'utf-8' });
    assert.match(out, /PASS/);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});