#!/usr/bin/env node
// scripts/release-check.mjs
// P13 — the check before a release (docs/release-runbook.md § Before the release).
// One command answers "may this HEAD be released?", so the answer is an exit
// code, never a summary:
//
//   node scripts/release-check.mjs --review <review.md> [--repo <dir>] [--version X.Y.Z] [--json]
//     0 = ready
//     1 = not ready — every failed check is listed
//     2 = could not run: not a git repo, no version to release, the suite could
//         not be started, or the review is missing or one the verdict gate (K7)
//         cannot decide. Exit 2 is NEVER green.
//
// The five checks, in the order they are reported:
//   tree      no uncommitted changes — otherwise the suite measures something
//             other than HEAD
//   suite     `npm test` exits 0 at HEAD (run for real, never read from a log)
//   review    lib/review/verdict-gate.mjs on the release's review.md: BLOCK
//             stops (1), undecided stops (2)
//   coverage  the review is of THIS history: its `scope_sha_end` is HEAD or an
//             ancestor of HEAD, and the commits after it touch only the release
//             bookkeeping (the CHANGELOG, the version in the version files,
//             the README version badge)
//   door      the CHANGELOG section for the version has a `### Doors` list with
//             one `- one-way: …` or `- two-way: …` line per delivery
//
// The version is --version, else `.claude-plugin/plugin.json`. The repo is
// --repo, else the working directory. Nothing here writes, tags or pushes.
// A ready run prints the K2 command that logs the operator's yes; it does not
// run it — the approval is the operator's.
//
// Door types (a one-way door cannot be walked back without a cost to users; a
// two-way door can) are credited to mattpocock/skills@c55ee46; the green suite
// on the merged tree to obra/superpowers@8ca22db. Ideas only, no text copied.

import { existsSync, readFileSync, realpathSync } from 'node:fs';
import { spawnSync } from 'node:child_process';
import { dirname, join, relative, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';
import { decideVerdict } from '../lib/review/verdict-gate.mjs';
import { commandEnv } from '../lib/util/command-env.mjs';

const PLUGIN_ROOT = resolve(dirname(fileURLToPath(import.meta.url)), '..');

export const EXIT = Object.freeze({ READY: 0, NOT_READY: 1, UNDECIDED: 2 });
export const CHECK_IDS = Object.freeze(['tree', 'suite', 'review', 'coverage', 'door']);

// Files a release commit may change after the reviewed commit, and how much of
// each (release review of 6.3.0, 2026-10-10: a changed test script or hook
// wiring passed as bookkeeping): the CHANGELOG freely; the version files only
// in their version (the JSON with it taken out must be equal); README.md only
// on the lines that carry the version badge.
export const RELEASE_BOOKKEEPING = Object.freeze([
  'CHANGELOG.md', 'package.json', 'package-lock.json', '.claude-plugin/plugin.json', 'README.md',
]);
// Voyage's own pipeline artifacts, committed by a repo that tracks them
// (`artifact_store: git`, `.claude/voyage/approvals.jsonl`): the review itself
// and the approval log land after the reviewed commit by design (release
// review of 6.3.0, round 3). The plan-file sweep treats them the same way.
const PROCESS_PREFIXES = Object.freeze(['.claude/projects/', '.claude/voyage/']);
const BADGE_RE = /badge\/version-/;
const VERSION_FILES = Object.freeze(['package.json', 'package-lock.json', '.claude-plugin/plugin.json']);

// The JSON of a version file with its version taken out: the top-level
// `version`, and in a lockfile the root package's `packages[""].version`.
export function withoutVersion(text) {
  const o = JSON.parse(text);
  if (o && typeof o === 'object') {
    delete o.version;
    if (o.packages && o.packages[''] && typeof o.packages[''] === 'object') delete o.packages[''].version;
  }
  return JSON.stringify(o);
}
const DOOR_LINE_RE = /^- (one-way|two-way): \S/;

const git = (cwd, args) => spawnSync('git', args, { cwd, encoding: 'utf8' });

/**
 * The CHANGELOG section for `version`, heading line excluded, or null. Matches
 * `## v1.2.3 …`, `## [1.2.3] …` and `## 1.2.3 …` exactly: 1.1.0 is not 1.10.0
 * and not 1.1.0-pre.
 */
export function releaseSection(text, version) {
  if (typeof text !== 'string' || !version) return null;
  const lines = text.split('\n');
  const headingVersion = (line) => {
    const m = line.match(/^##\s+\[?v?([^\]\s(]+)\]?/);
    return m ? m[1] : null;
  };
  let start = -1;
  for (let i = 0; i < lines.length; i++) {
    if (/^##\s/.test(lines[i]) && headingVersion(lines[i]) === version) { start = i + 1; break; }
  }
  if (start === -1) return null;
  let end = lines.length;
  for (let i = start; i < lines.length; i++) {
    if (/^##\s/.test(lines[i])) { end = i; break; }
  }
  return lines.slice(start, end).join('\n');
}

/**
 * The `### Doors` list of a release section. Top-level `- ` lines must read
 * `- one-way: …` or `- two-way: …`; indented lines continue the entry above.
 * @returns {{ found: boolean, entries: Array<{door: string, text: string}>, bad: string[] }}
 */
export function parseDoors(section) {
  const lines = String(section ?? '').split('\n');
  const start = lines.findIndex((l) => /^###\s+Doors\s*$/.test(l));
  if (start === -1) return { found: false, entries: [], bad: [] };
  const entries = [];
  const bad = [];
  for (let i = start + 1; i < lines.length; i++) {
    const line = lines[i];
    if (/^#{2,3}\s/.test(line)) break;
    if (!line.startsWith('- ')) continue;
    const m = line.match(DOOR_LINE_RE);
    if (m) entries.push({ door: m[1], text: line.slice(m[0].length - 1).trim() });
    else bad.push(line);
  }
  return { found: true, entries, bad };
}

// The +/- lines of a unified diff, read inside its hunks only: a content line
// that starts with "++ " or "-- " looks like a file header but is not one.
export function changedLines(diff) {
  const out = [];
  let inHunk = false;
  for (const l of diff.split('\n')) {
    if (l.startsWith('diff --git ')) inHunk = false;
    else if (l.startsWith('@@')) inHunk = true;
    else if (inHunk && /^[+-]/.test(l)) out.push(l);
  }
  return out;
}

function checkTree(repo) {
  const r = git(repo, ['status', '--porcelain', '--', '.']);
  if (r.status !== 0) return { id: 'tree', status: 'error', detail: `git status failed: ${r.stderr.trim()}` };
  const changed = r.stdout.split('\n').filter(Boolean);
  if (changed.length > 0) {
    return { id: 'tree', status: 'fail', detail: `${changed.length} uncommitted change(s) — commit or remove them; the suite must measure HEAD`, items: changed };
  }
  return { id: 'tree', status: 'pass', detail: 'working tree clean' };
}

function checkSuite(repo, treeClean) {
  if (!treeClean) return { id: 'suite', status: 'fail', detail: 'suite not run: the tree has uncommitted changes, so it would not measure HEAD' };
  // commandEnv: under a parent `node --test` the suite would report to it and exit 0 whatever it found.
  const r = spawnSync('npm', ['test'], { cwd: repo, encoding: 'utf8', maxBuffer: 256 * 1024 * 1024, env: commandEnv() });
  if (r.error) return { id: 'suite', status: 'error', detail: `npm test could not start: ${r.error.message} — not measured` };
  const out = `${r.stdout ?? ''}\n${r.stderr ?? ''}`;
  const summary = out.split('\n').filter((l) => /^ℹ (tests|pass|fail|skipped) /.test(l)).map((l) => l.slice(2));
  const tail = summary.length ? ` (${summary.join(', ')})` : '';
  if (r.status !== 0) return { id: 'suite', status: 'fail', detail: `npm test exited ${r.status} at HEAD${tail}` };
  return { id: 'suite', status: 'pass', detail: `npm test exited 0 at HEAD${tail}` };
}

function checkReview(reviewPath) {
  if (!reviewPath) return { check: { id: 'review', status: 'error', detail: 'no --review given — the release has no review verdict to read (K7)' }, text: null };
  if (!existsSync(reviewPath)) return { check: { id: 'review', status: 'error', detail: `${reviewPath} does not exist — no review, no release` }, text: null };
  let text;
  try { text = readFileSync(reviewPath, 'utf8'); } catch (e) {
    return { check: { id: 'review', status: 'error', detail: `${reviewPath} cannot be read: ${e.message}` }, text: null };
  }
  const v = decideVerdict(text);
  if (v.exit === 2) return { check: { id: 'review', status: 'error', detail: `verdict gate could not decide: ${v.reason}` }, text: null };
  if (v.exit === 1) return { check: { id: 'review', status: 'fail', detail: `review verdict BLOCK — ${v.reason}` }, text };
  return { check: { id: 'review', status: 'pass', detail: `review verdict ${v.verdict}` }, text };
}

/**
 * The review's `scope_sha_end` as written. Read from the frontmatter text, not
 * through the YAML reader, which turns an all-digit value into a number and
 * drops a leading zero (`0123456` → 123456; release review of 6.3.0, round 3).
 */
export function reviewedSha(reviewText) {
  const fm = /^---\r?\n([\s\S]*?)\r?\n---\r?\n/.exec(String(reviewText ?? ''));
  const m = fm && /^scope_sha_end:[ \t]*(["']?)([^"'\s#]*)\1[ \t]*(?:#.*)?$/m.exec(fm[1]);
  return m ? m[2] : '';
}

function checkCoverage(repo, reviewText) {
  if (reviewText === null) return { id: 'coverage', status: 'skip', detail: 'not checked: no readable review' };
  const sha = reviewedSha(reviewText);
  if (!sha) return { id: 'coverage', status: 'fail', detail: 'review.md has no scope_sha_end — cannot tell what it reviewed' };
  const resolved = git(repo, ['rev-parse', '--verify', '--quiet', `${sha}^{commit}`]);
  if (resolved.status !== 0) return { id: 'coverage', status: 'fail', detail: `the reviewed commit ${sha} is not in the history of HEAD (unknown commit)` };
  const full = resolved.stdout.trim();
  const anc = git(repo, ['merge-base', '--is-ancestor', full, 'HEAD']);
  if (anc.status !== 0) return { id: 'coverage', status: 'fail', detail: `the reviewed commit ${full.slice(0, 12)} is not in the history of HEAD` };

  // --relative: the paths, and the files that count, are those under the plugin's
  // own directory, also when it sits in a subdirectory of a larger repo.
  const names = git(repo, ['diff', '--relative', '--name-only', full, 'HEAD']);
  if (names.status !== 0) return { id: 'coverage', status: 'error', detail: `git diff failed: ${names.stderr.trim()}` };
  const changed = names.stdout.split('\n').filter(Boolean);
  const outside = changed.filter((f) => !RELEASE_BOOKKEEPING.includes(f) && !PROCESS_PREFIXES.some((p) => f.startsWith(p)));
  for (const file of changed.filter((f) => VERSION_FILES.includes(f))) {
    const before = git(repo, ['show', `${full}:./${file}`]);
    const after = git(repo, ['show', `HEAD:./${file}`]);
    if (before.status !== 0 || after.status !== 0) { outside.push(`${file} (added or removed after the review)`); continue; }
    let same;
    try { same = withoutVersion(before.stdout) === withoutVersion(after.stdout); } catch (e) {
      return { id: 'coverage', status: 'error', detail: `${file} is not JSON (${e.message}) — not measured` };
    }
    if (!same) outside.push(`${file} (lines other than the version)`);
  }
  if (changed.includes('README.md')) {
    const d = git(repo, ['diff', '--relative', '-U0', full, 'HEAD', '--', 'README.md']);
    if (d.status !== 0) return { id: 'coverage', status: 'error', detail: `git diff of README.md failed: ${d.stderr.trim()} — not measured` };
    if (changedLines(d.stdout).some((l) => !BADGE_RE.test(l))) outside.push('README.md (lines other than the version badge)');
  }
  if (outside.length > 0) {
    return { id: 'coverage', status: 'fail', detail: `changed after the reviewed commit ${full.slice(0, 12)} and not covered by the review: ${outside.join(', ')}`, items: outside };
  }
  const n = changed.length;
  return { id: 'coverage', status: 'pass', detail: n === 0 ? `review is of HEAD (${full.slice(0, 12)})` : `review covers HEAD except release bookkeeping (${changed.join(', ')})` };
}

function checkDoor(repo, version) {
  const p = join(repo, 'CHANGELOG.md');
  if (!existsSync(p)) return { id: 'door', status: 'fail', detail: 'no CHANGELOG.md — the door type is not set' };
  const section = releaseSection(readFileSync(p, 'utf8'), version);
  if (section === null) return { id: 'door', status: 'fail', detail: `CHANGELOG.md has no section for ${version} — the door type is not set` };
  const d = parseDoors(section);
  if (!d.found) return { id: 'door', status: 'fail', detail: `the ${version} section has no "### Doors" list — the door type is not set` };
  if (d.bad.length > 0) return { id: 'door', status: 'fail', detail: `door lines that are neither one-way nor two-way: ${d.bad.join(' | ')}`, items: d.bad };
  if (d.entries.length === 0) return { id: 'door', status: 'fail', detail: `the ${version} "### Doors" list has no door entries` };
  const oneWay = d.entries.filter((e) => e.door === 'one-way');
  const n = `${d.entries.length} ${d.entries.length === 1 ? 'delivery' : 'deliveries'}`;
  const detail = oneWay.length
    ? `${n}, ${oneWay.length} one-way: ${oneWay.map((e) => e.text).join(' | ')}`
    : `${n}, all two-way`;
  return { id: 'door', status: 'pass', detail, oneWay: oneWay.length };
}

function resolveVersion(repo, explicit) {
  if (explicit) return String(explicit).replace(/^v/, '');
  try {
    const v = JSON.parse(readFileSync(join(repo, '.claude-plugin', 'plugin.json'), 'utf8')).version;
    return typeof v === 'string' && v ? v : null;
  } catch { return null; }
}

/**
 * Run every check. Pure of process exit; the CLI below prints and exits.
 * @returns {{ exit: 0|1|2, version: string|null, repo: string, checks: object[], reason?: string }}
 */
export function releaseCheck({ repo, review, version: explicitVersion }) {
  const top = git(repo, ['rev-parse', '--show-toplevel']);
  if (top.error || top.status !== 0) return { exit: EXIT.UNDECIDED, version: null, repo, checks: [], reason: `${repo} is not a git repository` };
  // The plugin's own directory, not the git top level: a plugin may sit in a
  // subdirectory of a larger repo (release review of 6.3.0, round 2).
  const root = resolve(repo);
  const version = resolveVersion(root, explicitVersion);
  if (!version) return { exit: EXIT.UNDECIDED, version: null, repo: root, checks: [], reason: 'no version to release: pass --version or set .claude-plugin/plugin.json version' };

  // The cheap checks first: when one of them cannot be measured the answer is
  // already exit 2, and the suite (minutes) is not run for nothing.
  const tree = checkTree(root);
  const { check: rev, text } = checkReview(review ? resolve(review) : null);
  const coverage = checkCoverage(root, text);
  const door = checkDoor(root, version);
  const undecided = [tree, rev, coverage, door].filter((c) => c.status === 'error');
  const suite = undecided.length > 0
    ? { id: 'suite', status: 'skip', detail: `not run: ${undecided.map((c) => c.id).join(', ')} could not be measured, so the answer is exit 2 already` }
    : checkSuite(root, tree.status === 'pass');
  const checks = [tree, suite, rev, coverage, door];

  let exit = EXIT.READY;
  if (checks.some((c) => c.status === 'error')) exit = EXIT.UNDECIDED;
  else if (checks.some((c) => c.status === 'fail')) exit = EXIT.NOT_READY;
  return { exit, version, repo: root, checks };
}

function approvalCommand(root) {
  const cli = join(PLUGIN_ROOT, 'lib', 'util', 'approval-log.mjs');
  const rel = relative(root, cli);
  const shown = rel && !rel.startsWith('..') ? rel : cli;
  return `node ${shown} append --kind release --subject CHANGELOG.md --sha256-of CHANGELOG.md`;
}

function render(result) {
  const mark = { pass: '✓', fail: '✗', error: '?', skip: '·' };
  const out = [];
  if (result.reason) {
    out.push(`release-check: could not run — ${result.reason}`);
    out.push('NOT MEASURED (exit 2) — never green.');
    return out.join('\n');
  }
  out.push(`release-check: v${result.version} in ${result.repo}`);
  for (const c of result.checks) out.push(`  ${mark[c.status]} ${c.id.padEnd(8)} ${c.detail}`);
  if (result.exit === EXIT.READY) {
    out.push('READY (exit 0). Before anything is pushed, the operator reads the release section and, if yes, logs it from the repo root:');
    out.push(`  ${approvalCommand(result.repo)}`);
  } else if (result.exit === EXIT.NOT_READY) {
    out.push('NOT READY (exit 1) — fix every ✗ above, commit, and run the check again.');
  } else {
    out.push('NOT MEASURED (exit 2) — at least one check could not run (?). Never green.');
  }
  return out.join('\n');
}

function parseArgs(argv) {
  const out = { repo: process.cwd(), review: null, version: null, json: false };
  for (let i = 0; i < argv.length; i++) {
    const a = argv[i];
    if (a === '--repo' || a === '--review' || a === '--version') {
      const v = argv[++i];
      if (v === undefined || v.startsWith('--')) throw new Error(`${a} needs a value`);
      out[a.slice(2)] = v;
    } else if (a === '--json') out.json = true;
  }
  return out;
}

function isMain() {
  try {
    return Boolean(process.argv[1]) && realpathSync(process.argv[1]) === realpathSync(fileURLToPath(import.meta.url));
  } catch { return false; }
}

if (isMain()) {
  // Anything that throws is "could not run" (2), never "not ready" (1): exit 1
  // promises a list of failed checks, and none ran.
  let result;
  let json = process.argv.includes('--json');
  try {
    const args = parseArgs(process.argv.slice(2));
    json = args.json;
    result = releaseCheck({ repo: resolve(args.repo), review: args.review, version: args.version });
  } catch (e) {
    result = { exit: EXIT.UNDECIDED, version: null, repo: null, checks: [], reason: e.message };
  }
  process.stdout.write((json ? JSON.stringify(result, null, 2) : render(result)) + '\n');
  process.exit(result.exit);
}