// tests/commands/trekexecute-coupling.test.mjs
// Wave 2, order 6 — the executor's coupling to the contracts, run against the
// real CLIs (the prose pins are in tests/lib/coupling-prose-pins.test.mjs):
//
//   K7  a stub review.md with `verdict: BLOCK` → the verdict gate exits 1, and
//       Phase 8 keeps the main merge closed on 1 and on 2.
//   K2  a plan edited after approval → the exact Phase 1 command refuses it
//       (a temp repo, the real approval log).
//   K9  the step check's exit 2 → `step_check: "not-measured"`, never green.
//   K10 a failing `Regression:` → regression-check exits 1, so the step does
//       not reach its checkpoint.
//   C15 the runner's `exitCode` must be written as `exit_code`: the progress
//       validator rejects the runner's key in `plan_verification.failed_criteria`.

import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { spawnSync } from 'node:child_process';
import { mkdirSync, mkdtempSync, readFileSync, realpathSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { validateProgressObject } from '../../lib/validators/progress-validator.mjs';

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..', '..');
const CMD = readFileSync(join(ROOT, 'commands', 'trekexecute.md'), 'utf8');
const GATE = join(ROOT, 'lib', 'review', 'verdict-gate.mjs');
const LOG = join(ROOT, 'lib', 'util', 'approval-log.mjs');
const STEP_CHECK = join(ROOT, 'lib', 'verification', 'step-check.mjs');
const REGRESSION = join(ROOT, 'lib', 'verification', 'regression-check.mjs');

/** The text of a markdown section: from its heading to the next heading of the same or a higher level. */
function section(text, heading) {
  const at = text.indexOf(`\n${heading}\n`);
  assert.ok(at >= 0, `trekexecute.md must have the heading "${heading}"`);
  const level = heading.match(/^#+/)[0].length;
  const lines = text.slice(at + heading.length + 2).split('\n');
  const stop = new RegExp(`^#{1,${level}} `);
  let fenced = false;
  const out = [];
  for (const l of lines) {
    if (/^\s*(```|~~~)/.test(l)) fenced = !fenced;
    else if (!fenced && stop.test(l)) break;
    out.push(l);
  }
  return out.join('\n');
}

function tmp(prefix) {
  return realpathSync(mkdtempSync(join(tmpdir(), prefix)));
}

function git(cwd, ...args) {
  const r = spawnSync('git', args, { cwd, encoding: 'utf8' });
  assert.equal(r.status, 0, `git ${args.join(' ')}: ${r.stderr}`);
  return r.stdout.trim();
}

function repo() {
  const dir = tmp('coupling-repo-');
  git(dir, 'init', '-q', '-b', 'main');
  git(dir, 'config', 'user.email', 't@example.invalid');
  git(dir, 'config', 'user.name', 't');
  git(dir, 'config', 'commit.gpgsign', 'false');
  writeFileSync(join(dir, 'README.md'), 'x\n');
  git(dir, 'add', 'README.md');
  git(dir, 'commit', '-q', '-m', 'init');
  return dir;
}

const node = (args, opts = {}) => spawnSync(process.execPath, args, { encoding: 'utf8', ...opts });
const json = (r) => JSON.parse(r.stdout.trim().split('\n').pop());

// ---- K7 ---------------------------------------------------------------------

function reviewStub(verdict) {
  const id = 'b'.repeat(40);
  const severities = verdict === 'BLOCK' ? ['BLOCKER'] : [];
  const findings = severities.map((s) => ({
    id, severity: s, rule_key: 'MISSING_TEST', file: 'a.mjs', line: 1, title: 't', detail: 'd', recommended_action: 'Add a test.',
  }));
  const counts = { BLOCKER: severities.length, MAJOR: 0, MINOR: 0, SUGGESTION: 0 };
  const block = JSON.stringify({ verdict, counts, allow_blocked_by: [], findings }, null, 2);
  return [
    '---', 'type: trekreview', 'review_version: "1.1"', 'task: "t"', 'slug: s',
    'project_dir: .claude/projects/2026-10-08-s/', 'brief_path: .claude/projects/2026-10-08-s/brief.md',
    'scope_sha_end: abc', 'reviewed_files_count: 1', `verdict: ${verdict}`,
    severities.length ? `findings:\n  - ${id}` : 'findings: []', '---', '', '# Review: t', '',
    '## Executive Summary', '', 'x', '', '## Coverage', '', '| File | Treatment | Reason |', '|---|---|---|',
    '| a.mjs | summary-only | default |', '', '## Remediation Summary', '', 'x', '', '```json', block, '```', '',
  ].join('\n');
}

test('K7: a stub review.md with verdict BLOCK -> the gate exits 1, and Phase 8 keeps the merge closed on 1 and 2', () => {
  const dir = tmp('coupling-review-');
  try {
    const p = join(dir, 'review.md');
    writeFileSync(p, reviewStub('BLOCK'));
    const r = node([GATE, '--json', p]);
    assert.equal(r.status, 1, `BLOCK must exit 1: ${r.stdout}${r.stderr}`);
    assert.equal(json(r).verdict, 'BLOCK');
    writeFileSync(p, reviewStub('ALLOW'));
    assert.equal(node([GATE, p]).status, 0, 'the control: ALLOW exits 0');
    rmSync(p);
    assert.equal(node([GATE, p]).status, 2, 'a review that was never written exits 2');
  } finally { rmSync(dir, { recursive: true, force: true }); }

  const gate = section(CMD, '### Main-merge gate (MAIN_MERGE_GATE — always pauses)');
  assert.match(gate, /lib\/review\/verdict-gate\.mjs --json "\{review_path\}"/, 'Phase 8 runs the verdict gate on review.md');
  assert.match(gate, /\| 1 \| BLOCK \| closed/, 'exit 1 keeps the merge closed');
  assert.match(gate, /\| 2 \| not measured \| closed/, 'exit 2 keeps the merge closed - never green');
  assert.match(gate, /The merge runs only on exit 0/);
});

// ---- K2 ---------------------------------------------------------------------

/** The Phase 1 plan-approval command, as the prose writes it, with the placeholders filled. */
function approvalCommand(planPath) {
  const m = /node \$\{CLAUDE_PLUGIN_ROOT\}\/lib\/util\/approval-log\.mjs verify --json --kind plan --subject "\{plan_path\}" --sha256-of "\{plan_path\}"/.exec(
    section(CMD, '### Plan approval gate (K2)'),
  );
  assert.ok(m, 'Phase 1 must run approval-log.mjs verify --kind plan against the plan file');
  return [LOG, 'verify', '--json', '--kind', 'plan', '--subject', planPath, '--sha256-of', planPath];
}

test('K2: a plan edited after approval -> the Phase 1 command refuses it', () => {
  const dir = repo();
  try {
    const plan = join(dir, '.claude', 'projects', '2026-10-08-x', 'plan.md');
    mkdirSync(dirname(plan), { recursive: true });
    writeFileSync(plan, '# Plan\n\n### Step 1: one\n');
    const never = node(approvalCommand(plan), { cwd: dir });
    assert.equal(never.status, 1, 'a plan never approved is refused');
    assert.equal(json(never).status, 'not-logged');

    const add = node([LOG, 'append', '--kind', 'plan', '--subject', plan, '--sha256-of', plan], { cwd: dir });
    assert.equal(add.status, 0, add.stdout + add.stderr);
    assert.equal(node(approvalCommand(plan), { cwd: dir }).status, 0, 'the approved plan, unchanged, passes');

    writeFileSync(plan, '# Plan\n\n### Step 1: one\n### Step 2: added after approval\n');
    const edited = node(approvalCommand(plan), { cwd: dir });
    assert.equal(edited.status, 1, 'the edited plan is refused');
    assert.equal(json(edited).status, 'mismatch');
  } finally { rmSync(dir, { recursive: true, force: true }); }

  const gate = section(CMD, '### Plan approval gate (K2)');
  assert.match(gate, /Exit 1 → \*\*halt\*\*/, 'exit 1 halts');
  assert.match(gate, /Exit 2, or no JSON at all → \*\*halt\*\*/, 'exit 2 halts: a check that could not run is never a pass');
});

// ---- K9 ---------------------------------------------------------------------

const stepWith = (extra) => ({
  schema_version: '1', plan: 'plan.md', plan_version: '1.8', mode: 'execute', status: 'in_progress',
  total_steps: 1, current_step: 1, steps: { 1: { status: 'in_progress', attempts: 1, ...extra } },
});
const codes = (r) => r.errors.map((e) => e.code);

test('K9: exit 2 from the step check -> step_check "not-measured", never green', () => {
  const dir = tmp('coupling-norepo-');
  try {
    const r = node([STEP_CHECK, '--cwd', dir]);
    assert.equal(r.status, 2, `not a repository must be "not measured" (exit 2): ${r.stdout}${r.stderr}`);
  } finally { rmSync(dir, { recursive: true, force: true }); }

  const d4 = section(CMD, '#### Sub-step D4 — Step check and regression');
  assert.match(d4, /\| 2 \| `"not-measured"` \|/, 'exit 2 is written as not-measured');
  assert.match(d4, /never green/);
  for (const v of ['clean', 'findings', 'not-measured']) {
    assert.deepEqual(codes(validateProgressObject(stepWith({ step_check: v }))), [], `step_check ${v}`);
  }
  for (const bad of ['green', 'pass', 'measured', 2]) {
    assert.deepEqual(codes(validateProgressObject(stepWith({ step_check: bad }))), ['PROGRESS_STEP_CHECK_INVALID'], `step_check ${bad}`);
  }
});

// ---- K10 --------------------------------------------------------------------

function regressionRepo(regressionLine) {
  const dir = repo();
  mkdirSync(join(dir, 'tests'));
  writeFileSync(join(dir, 'tests', 'red.test.mjs'), "import { test } from 'node:test';\ntest('red', () => { throw new Error('red'); });\n");
  writeFileSync(join(dir, 'tests', 'green.test.mjs'), "import { test } from 'node:test';\ntest('green', () => {});\n");
  const plan = join(dir, 'plan.md');
  writeFileSync(plan, [
    '---', 'plan_version: "1.8"', '---', '', '## Implementation Plan', '',
    '### Step 1: the step', '- **Files:** `src/a.mjs`', '- **Verify:** `node --test tests/green.test.mjs`',
    ...(regressionLine ? [regressionLine] : []), '- **On failure:** revert', '',
    '### Step 2: the next', '- **Files:** `src/b.mjs`', '- **Regression:** `node --test tests/green.test.mjs`', '',
  ].join('\n'));
  return { dir, plan };
}

const regression = (dir, plan, step = '1') => node([REGRESSION, '--plan', plan, '--step', step, '--cwd', dir, '--json']);

test('K10: a failing Regression: -> exit 1, the step does not reach its checkpoint', () => {
  const red = regressionRepo('- **Regression:** `node --test tests/red.test.mjs`');
  try {
    const r = regression(red.dir, red.plan);
    assert.equal(r.status, 1, `a red regression exits 1: ${r.stdout}${r.stderr}`);
    const out = json(r);
    assert.equal(out.status, 'failed');
    assert.equal(out.exit_code, 1, 'the exit code is written as exit_code (C15)');
    assert.ok(!('exitCode' in out), 'never the runner key');
    assert.equal(regression(red.dir, red.plan, '2').status, 0, 'step 2 has its own, green regression');
  } finally { rmSync(red.dir, { recursive: true, force: true }); }

  const absent = regressionRepo(null);
  try {
    const r = regression(absent.dir, absent.plan);
    assert.equal(r.status, 0, 'no Regression: field -> nothing new happens');
    assert.equal(json(r).status, 'absent');
  } finally { rmSync(absent.dir, { recursive: true, force: true }); }

  const piped = regressionRepo('- **Regression:** `npm test | tee x`');
  try {
    const r = regression(piped.dir, piped.plan);
    assert.equal(r.status, 1, 'a command outside the allowlist is never green');
    assert.equal(json(r).status, 'unrunnable');
  } finally { rmSync(piped.dir, { recursive: true, force: true }); }

  const none = node([REGRESSION, '--plan', join(tmpdir(), 'no-such-plan-coupling.md'), '--step', '1', '--json']);
  assert.equal(none.status, 2, 'a plan that cannot be read is "could not run"');

  const d4 = section(CMD, '#### Sub-step D4 — Step check and regression');
  assert.match(d4, /lib\/verification\/regression-check\.mjs"? --plan "\{plan_path\}" --step \{N\}/);
  assert.match(d4, /a finding for Sub-step F/, 'a red regression goes into the fix rounds');
  const e = section(CMD, '#### Sub-step E — Control');
  assert.match(e, /`regression` is `"passed"` or `"absent"`/, 'the round passes only on a green or absent regression');
});

// ---- C15 --------------------------------------------------------------------

const withVerification = (failed) => ({
  ...stepWith({}), plan_verification: { status: 'failed', summary: { total: 1, passed: 0, failed: 1, blocked: 0, unrunnable: 0 }, failed_criteria: failed },
});

test('C15: the progress validator rejects exitCode in failed_criteria and accepts exit_code', () => {
  assert.deepEqual(codes(validateProgressObject(withVerification([{ label: 'V1', command: 'npm test', exit_code: 1 }]))), []);
  assert.deepEqual(codes(validateProgressObject(withVerification([{ label: 'V1', command: 'npm test', exit_code: null }]))), [],
    'null: the criterion never ran');
  assert.deepEqual(codes(validateProgressObject(withVerification([{ label: 'V1', command: 'npm test', exitCode: 1 }]))),
    ['PROGRESS_FAILED_CRITERIA_KEY']);
  assert.deepEqual(codes(validateProgressObject(withVerification([{ label: 'V1', command: 'npm test' }]))),
    ['PROGRESS_FAILED_CRITERIA_KEY'], 'exit_code is required in each entry');
  assert.match(section(CMD, '### trekplans — run the plan\'s `## Verification`'), /`exitCode` → `exit_code`/,
    'the executor translates the runner key explicitly');
});

// ---- P11: a BLOCK's remediation steps are checked before anyone is asked -------

test('P11: a review step in the template form is caught by the plan validator, so the loop stops before it asks', async () => {
  const { buildPlan } = await import('../helpers/plan-v18-builder.mjs');
  const { validatePlanContent } = await import('../../lib/validators/plan-validator.mjs');
  const plan = buildPlan();
  assert.deepEqual(validatePlanContent(plan, { strict: true }).errors, [], 'the control: the plan before the append is valid');
  // The review template's own Step R1, appended the Phase 7.2 way: next number, fields as they are, a Checkpoint.
  const tpl = readFileSync(join(ROOT, 'templates', 'trekreview-template.md'), 'utf8');
  const r1 = /### Step R1:[^\n]*\n[\s\S]*?(?=\n> )/.exec(tpl);
  assert.ok(r1, 'templates/trekreview-template.md carries a ### Step R1');
  const appended = r1[0].replace(/^### Step R1:/, '### Step 3:') +
    '- **Checkpoint:** `git commit -m "fix(review): block-style YAML [01234567]"`\n';
  const edited = plan.replace('\n## Test Strategy', `\n${appended}\n## Test Strategy`);
  const errors = validatePlanContent(edited, { strict: true }).errors.map((e) => e.code);
  assert.ok(errors.length > 0, 'a remediation step the executor cannot run must not validate');
  assert.ok(errors.some((c) => /VERIFY_NOT_RUNNABLE|TEST_FIRST/.test(c)), errors.join(','));

  const p = section(CMD, '## Phase 7.2 — Simplify, review, verdict (P11)');
  const check = p.indexOf('plan-validator.mjs --strict --json --steps-from {total + 1} "{plan_path}"');
  const ask = p.indexOf('Approve the plan as it is now?');
  assert.ok(check > 0 && ask > check, 'the validator runs before the approval question');
  assert.match(p, /restore the plan from the copy/, 'a stop leaves the plan matching its approval');
});

test('P11: the lock is passed only by the closing run - a wave session keeps its completed', () => {
  const gate = section(CMD, '### Main-merge gate (MAIN_MERGE_GATE — always pauses)');
  assert.match(gate, /Only the closing run passes the lock/);
  assert.match(gate, /`--session N`\s+child, a `--step N` run and a session spec/);
  assert.match(gate, /left as Phase 7\.5 decided it/);
  assert.match(section(CMD, '## Phase 7.2 — Simplify, review, verdict (P11)'), /never a `--step N` run, a `--session N`\s+child/);
});

test('every bash block outside Phase 2.6 that calls "$VOYAGE_ROOT" resolves it itself', () => {
  const start = CMD.indexOf('\n## Phase 2.6 —');
  const end = CMD.indexOf('\n## Phase 3 —');
  const outside = CMD.slice(0, start) + CMD.slice(end);
  const fences = [...outside.matchAll(/```bash\n([\s\S]*?)```/g)].map((m) => m[1]);
  // A wave-path block (it runs from "$REPO_ROOT") uses the values Phase 2.6 Step 0 records.
  const using = fences.filter((f) => f.includes('"$VOYAGE_ROOT/') && !f.includes('"$REPO_ROOT"'));
  assert.ok(using.length >= 3, `expected the Phase 7, D4 and K5/K6 blocks, found ${using.length}`);
  for (const f of using) {
    assert.match(f, /^VOYAGE_ROOT="\$\{CLAUDE_PLUGIN_ROOT\}"$/m, `a block uses $VOYAGE_ROOT without resolving it:\n${f.slice(0, 300)}`);
    assert.match(f, /\[ ! -f "\$VOYAGE_ROOT\//, 'and guards the unresolved root with exit 2');
  }
});

// ---- P12: the guard is the one question, and it refuses where no one is asked --

const GUARD = join(ROOT, 'hooks', 'scripts', 'pre-bash-executor.mjs');
const NO_PROMPT_MODE = 'bypassPermissions';

function guard(cwd, command, permission_mode) {
  return node([GUARD], {
    input: JSON.stringify({ tool_name: 'Bash', tool_input: { command }, cwd, permission_mode, session_id: 'coupling', tool_use_id: `t${Math.random()}` }),
  });
}

test('P12: the guard asks before a merge into main; in the mode with no prompts it refuses (operator 2026-10-09)', () => {
  const dir = repo();
  try {
    git(dir, 'branch', 'feature');
    const merge = 'git merge --no-ff feature -m "merge: trekexecute x"';
    for (const mode of ['default', 'auto', 'acceptEdits']) {
      const r = guard(dir, merge, mode);
      assert.equal(r.status, 0, `${mode}: ${r.stderr}`);
      assert.match(r.stdout, /"permissionDecision":"ask"/, `${mode}: the merge into main is asked`);
    }
    const blocked = guard(dir, merge, NO_PROMPT_MODE);
    assert.equal(blocked.status, 2, 'no one to ask: the merge into main is refused');
    assert.match(blocked.stderr, /no one to ask/);
    assert.match(blocked.stderr, /Way forward/);
    assert.equal(guard(dir, 'git push origin feature', NO_PROMPT_MODE).status, 2, 'a push is refused too');
    // Operator 2026-10-09, second decision: the other two classes as well.
    for (const cmd of ['git tag v1.0', 'npm publish', 'git reset --hard HEAD~1', 'git push --force origin feature']) {
      assert.match(guard(dir, cmd, 'default').stdout, /"permissionDecision":"ask"/, `the control: ${cmd} is asked where someone can answer`);
      const r = guard(dir, cmd, NO_PROMPT_MODE);
      assert.equal(r.status, 2, `${cmd}: refused where no one is asked`);
      assert.match(r.stderr, /no one to ask/);
    }
    const plain = guard(dir, 'git status', NO_PROMPT_MODE);
    assert.equal(plain.status, 0, 'an ordinary command still runs');
    assert.equal(plain.stdout, '');
  } finally { rmSync(dir, { recursive: true, force: true }); }
});

// Release review of 6.3.0 (2026-10-10): the refusal covers the guard's two
// fallbacks too — rules that will not load, and a command it could not read.
function guardIn(plugin, cwd, command, permission_mode) {
  return node([join(plugin, 'hooks', 'scripts', 'pre-bash-executor.mjs')], {
    input: JSON.stringify({ tool_name: 'Bash', tool_input: { command }, cwd, permission_mode, session_id: 'coupling', tool_use_id: `t${Math.random()}` }),
  });
}

test('P12 / review 630: a guard whose rules will not load refuses where no one is asked', async () => {
  const { pluginCopy } = await import('../hooks/guard-helpers.mjs');
  const plugin = pluginCopy({ 'hooks/lib/git-approval.mjs': 'missing' });
  const dir = repo();
  try {
    const asked = guardIn(plugin, dir, 'git status', 'default');
    assert.equal(asked.status, 0, asked.stderr);
    assert.match(asked.stdout, /"permissionDecision":"ask"/, 'the control: where someone can answer, the broken guard asks');
    const r = guardIn(plugin, dir, 'git push origin main', NO_PROMPT_MODE);
    assert.equal(r.status, 2, `refused, not asked: ${r.stdout}${r.stderr}`);
    assert.match(r.stderr, /no one to ask/);
    assert.match(r.stderr, /could not load/);
  } finally {
    rmSync(dir, { recursive: true, force: true });
    rmSync(plugin, { recursive: true, force: true });
  }
});

test('P12 / review 630: a command the classifier could not read is asked, and refused where no one is asked', async () => {
  const { pluginCopy } = await import('../hooks/guard-helpers.mjs');
  const plugin = pluginCopy();
  const lib = join(plugin, 'hooks', 'lib', 'git-approval.mjs');
  const src = readFileSync(lib, 'utf8');
  assert.ok(src.includes('export function classifyGitApproval('), 'the copy carries the classifier');
  writeFileSync(lib, src.replace('export function classifyGitApproval(',
    'export function classifyGitApproval() { throw new Error(\'classifier broke\'); }\nfunction classifyGitApprovalUnused('));
  const dir = repo();
  try {
    const asked = guardIn(plugin, dir, 'git push origin feature', 'default');
    assert.equal(asked.status, 0, asked.stderr);
    assert.match(asked.stdout, /"permissionDecision":"ask"/, 'where someone can answer it is asked');
    assert.match(asked.stdout, /could not read/);
    const r = guardIn(plugin, dir, 'git push origin feature', NO_PROMPT_MODE);
    assert.equal(r.status, 2, `refused: ${r.stdout}${r.stderr}`);
    assert.match(r.stderr, /could not read/);
    assert.match(r.stderr, /no one to ask/);
  } finally {
    rmSync(dir, { recursive: true, force: true });
    rmSync(plugin, { recursive: true, force: true });
  }
});

// ---- the other new progress fields (Handover 5, additive-optional) -----------

test('H5: the wave-2 fields are shape-checked when present and optional when absent', () => {
  assert.deepEqual(codes(validateProgressObject(stepWith({}))), [], 'an older progress file still validates');
  const ok = {
    ...stepWith({ regression: 'passed' }),
    plan_approval: 'approved', arch_rules: 'not-measured', simplify: 'applied',
    scope_sweep: { status: 'deviation', outside: ['src/x.mjs'] },
    review: { round: 1, path: '.claude/projects/x/review.md', gate_exit: 1, verdict: 'BLOCK' },
  };
  assert.deepEqual(codes(validateProgressObject(ok)), []);
  const bad = [
    [{ ...stepWith({ regression: 'green' }) }, 'PROGRESS_REGRESSION_INVALID'],
    [{ ...stepWith({}), plan_approval: 'yes' }, 'PROGRESS_PLAN_APPROVAL_INVALID'],
    [{ ...stepWith({}), arch_rules: 'green' }, 'PROGRESS_ARCH_RULES_INVALID'],
    [{ ...stepWith({}), simplify: 'done' }, 'PROGRESS_SIMPLIFY_INVALID'],
    [{ ...stepWith({}), scope_sweep: { status: 'deviation' } }, 'PROGRESS_SCOPE_SWEEP_INVALID'],
    [{ ...stepWith({}), review: { round: 0, gate_exit: 0 } }, 'PROGRESS_REVIEW_INVALID'],
    [{ ...stepWith({}), review: { round: 1, gate_exit: 3 } }, 'PROGRESS_REVIEW_INVALID'],
  ];
  for (const [p, code] of bad) assert.deepEqual(codes(validateProgressObject(p)), [code], JSON.stringify(p));
});