// tests/lib/removed-surfaces.test.mjs
// Cleanup R-b removed three surfaces: Voyage's own measurement, statistics and
// export (R1, decision 189; Claude Code's own OpenTelemetry took over), the
// STORM loop and the research engine choice (R2, decision 190), and the
// profiles, phase signals and effort dialog (R3, decision 191). No tracked
// file may name them again, so a removed surface cannot come back unseen.
//
// Scope: every tracked text file except CHANGELOG.md (history), *.local.*
// files (never tracked) and this test. A term is a plain substring, except a
// flag, which must stand as its own token (`--engine`, `--profile`).
//
// Every group always runs. When this test fails, remove the mention; add an
// EXEMPT entry only for a line that must keep the term, with the reason.

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

const HERE = dirname(fileURLToPath(import.meta.url));
const ROOT = join(HERE, '..', '..');
const SELF = 'tests/lib/removed-surfaces.test.mjs';

const flag = name => new RegExp(`(?<![\\w-])${name}(?![\\w-])`);

const GROUPS = {
  R1: [
    'lib/stats/', 'lib/exporters/', 'otel-export', 'post-bash-stats', 'stats-append', 'event-emit',
    'yardstick.mjs', 'scripts/yardstick', 'end-state-gate', 'end-state-registry', 'comparison-gate',
    'brief-approved', '-stats.jsonl', 'main-merge-gate', 'main-merge-approved', 'main-merge-declined',
    'VOYAGE_EXPORT_MODE', 'VOYAGE_OTEL_ENDPOINT', 'VOYAGE_TEXTFILE_DIR', 'VOYAGE_OTEL_ALLOW_PRIVATE',
    'VOYAGE_TOKEN_METER', 'gold-scorer', 'synthesis-measure',
  ],
  R2: [
    'VOYAGE_STORM_ENABLED', 'TREKRESEARCH_MAX_CONV_TURNS', 'VOYAGE_DISABLE_CAP_HOOK', 'VOYAGE_CAP_SCOPE_TTL_MS',
    'research-loop-cap', 'pre-agent-cap', 'storm-measure', flag('--engine'), 'effective_engine',
  ],
  R3: [
    'lib/profiles/', flag('--profile'), 'phase_signals', 'phase_signal_result', 'resolve-phase-model',
    'docs/profiles.md', 'MANIFEST_PROFILE_DRIFT', 'BRIEF_V51_MISSING_SIGNALS', 'VOYAGE_PROFILE',
    'VOYAGE_ALLOW_HAIKU', 'voyage-profiles/', 'resolveTrekcontinueProfile', 'profile_used',
  ],
};

// Named exceptions: "path:line" -> reason. Each must still hit (a stale
// exemption fails below).
const EXEMPT = new Map([
  ['docs/HANDOVER-CONTRACTS.md:81', 'public contract: an older brief\'s key is ignored (decisions 179/191)'],
  ['docs/proevesett.md:139', 'dated v1/v2 measurement record of the fixed test set, kept unedited'],
  ['docs/proevesett.md:143', 'dated v1/v2 measurement record of the fixed test set, kept unedited'],
  ['docs/proevesett.md:146', 'dated v1/v2 measurement record of the fixed test set, kept unedited'],
  ['commands/trekbrief.md:34', 'a command strips the retired flag where it parses its arguments'],
  ['commands/trekexecute.md:36', 'a command strips the retired flag where it parses its arguments'],
  ['commands/trekplan.md:31', 'a command strips the retired flag where it parses its arguments'],
  ['commands/trekresearch.md:29', 'a command strips the retired flag where it parses its arguments'],
  ['lib/parsers/arg-parser.mjs:19', 'retired flag swallows its value'],
  ['lib/parsers/arg-parser.mjs:23', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:285', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:286', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:289', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:291', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:292', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:293', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:294', 'retired flag swallows its value'],
  ['tests/lib/arg-parser.test.mjs:295', 'retired flag swallows its value'],
  ['tests/validators/brief-validator.test.mjs:200', 'older brief stays valid (decision 191)'],
  ['tests/validators/brief-validator.test.mjs:203', 'older brief stays valid (decision 191)'],
  ['tests/validators/brief-validator.test.mjs:205', 'older brief stays valid (decision 191)'],
]);

const matches = (term, line) => (typeof term === 'string' ? line.includes(term) : term.test(line));

// Each file is read and split once for all groups; a binary file has no lines.
const lineCache = new Map();
function linesOf(root, rel) {
  const path = join(root, rel);
  if (!lineCache.has(path)) {
    const buf = readFileSync(path);
    lineCache.set(path, buf.includes(0) ? [] : buf.toString('utf-8').split('\n'));
  }
  return lineCache.get(path);
}

// "path:line" for every line of the given files that names a term of the group.
function scan(root, files, terms) {
  const hits = [];
  for (const rel of files) {
    linesOf(root, rel).forEach((line, i) => {
      if (terms.some(t => matches(t, line))) hits.push(`${rel}:${i + 1}`);
    });
  }
  return hits;
}

function inScope(rel) {
  return rel !== 'CHANGELOG.md' && rel !== SELF && !/\.local\./.test(rel);
}

let files = null;
function tracked() {
  if (!files) {
    files = execFileSync('git', ['ls-files', '-z'], { cwd: ROOT, encoding: 'utf-8' })
      .split('\0').filter(Boolean).filter(inScope);
  }
  return files;
}

test('scan finds a term, and a flag only as its own token (known-positive)', () => {
  const dir = mkdtempSync(join(tmpdir(), 'removed-surfaces-'));
  try {
    mkdirSync(join(dir, 'docs'), { recursive: true });
    writeFileSync(join(dir, 'docs', 'a.md'), [
      'Set VOYAGE_STORM_ENABLED=1 first.',
      'Run with --engine deep-research.',
      'The engine-findings compare stays; so does --engines-list.',
      'Pass `--profile economy`.',
    ].join('\n'));
    assert.deepEqual(scan(dir, ['docs/a.md'], GROUPS.R2), ['docs/a.md:1', 'docs/a.md:2']);
    assert.deepEqual(scan(dir, ['docs/a.md'], GROUPS.R3), ['docs/a.md:4']);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});

test('scope leaves out history, local files and this test', () => {
  assert.ok(inScope('commands/trekresearch.md'));
  assert.ok(inScope('lib/validators/brief-validator.mjs'));
  assert.ok(!inScope('CHANGELOG.md'));
  assert.ok(!inScope('docs/notes.local.md'));
  assert.ok(!inScope(SELF));
});

for (const group of Object.keys(GROUPS)) {
  test(`${group}: no tracked file names a removed surface`, () => {
    const all = tracked();
    assert.ok(all.length > 100, `git ls-files returned ${all.length} files; refusing to pass on an empty scan`);
    const hits = scan(ROOT, all, GROUPS[group]).filter(h => !EXEMPT.has(h));
    assert.deepEqual(hits, [], `${hits.length} line(s) still name a ${group} surface:\n${hits.join('\n')}`);
  });
}

test('every EXEMPT entry still names a removed surface', () => {
  const terms = Object.values(GROUPS).flat();
  const all = new Set(tracked());
  for (const key of EXEMPT.keys()) {
    const rel = key.replace(/:\d+$/, '');
    assert.ok(all.has(rel), `EXEMPT names untracked ${rel}`);
    assert.ok(scan(ROOT, [rel], terms).includes(key), `EXEMPT entry "${key}" no longer hits; remove it`);
  }
});