/**
 * Planning Inspect Module — the schema-v1 canonical planning snapshot (#2790).
 *
 * `planning.inspect` is READ-ONLY: it opens `.planning/` documents and writes
 * nothing, anywhere, ever. Downstream harness UIs (gsd-code Phase 12, plan
 * mission-control) consume it instead of parsing ROADMAP/REQUIREMENTS/PLAN/
 * SUMMARY markdown a second time — gsd-core is the single source of `.planning/`
 * truth.
 *
 * COMPOSED, NOT RE-DERIVED. Every ADR-3180 §7 derivation arrives from its
 * declared owner: milestone identity and windowing from `getMilestoneInfo`
 * (§7.2) and phase enumeration from `listMilestonePhaseDirs` (§7.3), both via
 * `buildPlanningSnapshot`; phase completion from `isPhaseComplete` (§7.4,
 * disk-strict); live-plan counting from `scanPhasePlans` (§7.5); the
 * fraction→percent arithmetic from `clampPercent` (§7.6). Plan bodies come from
 * `parsePlanDocument` (`src/plan-document.cts`), requirement IDs from
 * `parseRequirements` (`src/gap-checker.cts`), UAT items from `parseUatItems`
 * (`src/uat.cts`). This module introduces no second answer to any of those
 * questions.
 *
 * WHY THIS DOES NOT SERIALIZE `PlanningSnapshot` DIRECTLY. `PlanningSnapshot`
 * is the §8.1 *diagnostic-rule subject* — explicitly additive and still growing
 * (4 fields at Phase 10, 20+ by Phase 12). schema-v1 is a frozen EXTERNAL
 * contract. Handing an internal, churning shape to external consumers is a
 * Hyrum's-Law break waiting to happen, so this module declares its own flat
 * schema and maps into it. Adding a field to `PlanningSnapshot` must never
 * change what `planning.inspect` emits.
 *
 * NEVER INFERS. Where evidence is absent or two sources disagree, the value is
 * `null` / `unknown` and a diagnostic names why. It is never reconciled, never
 * guessed, and never filled from a plausible default. Keys are ALWAYS present —
 * omitting a key on a non-answer is itself an observable a consumer would bind
 * to.
 *
 * NOT a diagnostic rule, and deliberately NOT registered in
 * `scripts/lint-planning-snapshot-bypass-drift.cjs`: that guard is
 * `DIAGNOSTIC_RULE_FUNCTIONS`-scoped and must be prunable to zero when #3309
 * lands. This is a query command.
 *
 * ADR-457 build-at-publish: source in src/planning-inspect.cts, compiled to
 * gsd-core/bin/lib/planning-inspect.cjs (gitignored).
 */

import fs from 'node:fs';
import path from 'node:path';
// eslint-disable-next-line @typescript-eslint/no-require-imports
import planningSnapshotMod = require('./planning-snapshot.cjs');
const { buildPlanningSnapshot, worstScope } = planningSnapshotMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import planningWorkspaceMod = require('./planning-workspace.cjs');
const { planningPaths } = planningWorkspaceMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import planScan = require('./plan-scan.cjs');
// eslint-disable-next-line @typescript-eslint/no-require-imports
import planDocumentMod = require('./plan-document.cjs');
const { parsePlanDocument, TASK_KIND, planIdFromFile } = planDocumentMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import gapCheckerMod = require('./gap-checker.cjs');
const { parseRequirements } = gapCheckerMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import uatMod = require('./uat.cjs');
const { parseUatItemsWithStats, selectPhaseUatFiles } = uatMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import phaseLifecycleMod = require('./phase-lifecycle.cjs');
const { clampPercent } = phaseLifecycleMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import planningScopeMod = require('./planning-scope.cjs');
const { SCOPE } = planningScopeMod;
type Scope = planningScopeMod.Scope;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import verificationMod = require('./verification.cjs');
const { readVerificationStatus } = verificationMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import phaseIdMod = require('./phase-id.cjs');
const { phaseKeyFromDir, phaseKeyFromToken, phaseMarkdownRegexSource } = phaseIdMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import roadmapParserMod = require('./roadmap-parser.cjs');
const { extractCurrentMilestone } = roadmapParserMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import io = require('./io.cjs');
const { output } = io;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import frontmatterMod = require('./frontmatter.cjs');
const { extractFrontmatter, stripFrontmatter } = frontmatterMod;
import { stateFieldValue, stateCurrentPositionSlice } from './state-document.cjs';
// eslint-disable-next-line @typescript-eslint/no-require-imports
import markdownSectionizer = require('./markdown-sectionizer.cjs');
const { collectSection, iterateBullets } = markdownSectionizer;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import markdownTable = require('./markdown-table.cjs');
const { parseMarkdownTable, matchTableSchema } = markdownTable;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import coreUtilsMod = require('./core-utils.cjs');
const { normalizeLineEndings } = coreUtilsMod;
// eslint-disable-next-line @typescript-eslint/no-require-imports
import securityMod = require('./security.cjs');
const { tryWithinRoot, PathAcceptance, isContainedIn } = securityMod;

/**
 * The wire schema version. A consumer MUST reject any value other than this
 * one rather than best-effort-parsing an unknown shape.
 */
const PLANNING_INSPECT_SCHEMA_VERSION = 1;

/**
 * Frozen diagnostic vocabulary. Adding a member is the repo's standard three
 * coordinated changes: this enum, the emitting site, and the test that locks
 * `Object.keys(INSPECT_DIAGNOSTIC).sort()`.
 */
const INSPECT_DIAGNOSTIC = Object.freeze({
  PLANNING_ROOT_ABSENT: 'planning_root_absent',
  ROADMAP_UNSCOPED: 'roadmap_unscoped',
  REQUIREMENTS_ABSENT: 'requirements_absent',
  REQUIREMENTS_UNREADABLE: 'requirements_unreadable',
  REQUIREMENT_DUPLICATE: 'requirement_duplicate',
  REQUIREMENT_UNMAPPED: 'requirement_unmapped',
  REQUIREMENT_PHASE_UNKNOWN: 'requirement_phase_unknown',
  REQUIREMENT_COMPLETION_UNKNOWN: 'requirement_completion_unknown',
  ORPHAN_PHASE_DIR: 'orphan_phase_dir',
  PHASE_SCOPE_DEGRADED: 'phase_scope_degraded',
  PLAN_UNREADABLE: 'plan_unreadable',
  SUMMARY_UNREADABLE: 'summary_unreadable',
  TASK_SHAPE_CHECKPOINT: 'task_shape_checkpoint',
  TASK_CHANGED_FILES_PLAN_SCOPED: 'task_changed_files_plan_scoped',
  TASK_CHANGED_FILES_CONFLICTING: 'task_changed_files_conflicting',
  UAT_ABSENT: 'uat_absent',
  UAT_UNREADABLE: 'uat_unreadable',
  PERCENT_WITHHELD: 'percent_withheld',
});

type InspectDiagnosticCode = (typeof INSPECT_DIAGNOSTIC)[keyof typeof INSPECT_DIAGNOSTIC];

/** Whether a task has a completion record. `unknown` is a first-class answer. */
const TASK_STATUS = Object.freeze({
  DONE: 'done',
  PENDING: 'pending',
  UNKNOWN: 'unknown',
});

type TaskStatus = (typeof TASK_STATUS)[keyof typeof TASK_STATUS];

/**
 * How precisely a changed-file list is attributed. `plan_scoped` is the common
 * case and is NOT an error — SUMMARY.md's `## Files Created/Modified` is a
 * plan-level section, so spreading it across a plan's tasks would be inference.
 */
const PROVENANCE = Object.freeze({
  TASK_SCOPED: 'task_scoped',
  PLAN_SCOPED: 'plan_scoped',
  ABSENT: 'absent',
});

type Provenance = (typeof PROVENANCE)[keyof typeof PROVENANCE];

/** Whether planned and changed file sets agree. Never reconciled. */
const AGREEMENT = Object.freeze({
  AGREED: 'agreed',
  CONFLICTING: 'conflicting',
  UNKNOWN: 'unknown',
});

type Agreement = (typeof AGREEMENT)[keyof typeof AGREEMENT];

interface Diagnostic {
  code: InspectDiagnosticCode;
  subject: string;
  detail: string;
}

interface Fraction {
  completed: number;
  total: number;
  /** `null` whenever `scope !== complete` — ADR-3180 §7.6 rule 4. */
  percent: number | null;
  scope: Scope;
}

// ─── Small shared helpers ─────────────────────────────────────────────────────

/**
 * Path separators are normalised UNCONDITIONALLY, never via `path.sep` — a
 * backslash-bearing path can arrive on Linux too, so a platform-gated
 * normaliser leaves the non-Windows case untested and broken.
 */
function toPosix(value: string): string {
  return value.replace(/\\/g, '/');
}

/**
 * Read a UTF-8 file, distinguishing absent from unreadable.
 *
 * `root` is a containment boundary, not a convenience default: every
 * document this module reads arrives as UNTRUSTED input — a clone, a PR
 * branch, a teammate's working tree — and the assembled payload is handed
 * to downstream tooling verbatim (see module doc). A `*-PLAN.md` (or any
 * other document under `.planning/`) that is a SYMLINK resolving outside
 * `root` is therefore an exfiltration path, not a convenience: reading it
 * would let a planted symlink smuggle arbitrary readable file content into
 * the emitted payload. Both `filePath` and `root` are resolved with
 * `fs.realpathSync` — never a raw string prefix check on the unresolved
 * path — so a project that legitimately symlinks its whole `.planning/`
 * directory, or a single phase directory, elsewhere on disk keeps working;
 * only a resolved target that ends up OUTSIDE the resolved root is
 * rejected. An escape is reported as unreadable (same shape as any other
 * unreadable document) so existing per-document degradation and
 * diagnostics apply unchanged.
 */
/**
 * Path-boundary-safe comparison of two ALREADY-RESOLVED absolute paths — the
 * ONE containment comparison every containment check in this module shares
 * (`readDocument`'s file-level guard, `isPathContained` below for
 * directories and the verification-status `fs` seam), so none of them can
 * drift apart. `target` must equal `root`, or begin with `root` plus a path
 * separator; a bare `startsWith(root)` would wrongly accept a sibling
 * directory like `.planning-evil/` that merely shares a string prefix. Pure
 * string comparison, no I/O — callers own their own `fs.realpathSync` call
 * (and its own not-found/broken-symlink handling).
 *
 * NOT an independent containment implementation — it is the comparison step
 * of one, and that comparison now comes from `security.cts`'s exported
 * `isContainedIn` rather than being redeclared here. `readDocument` below
 * realpaths target and root itself (to keep its own exists-vs-escaped
 * tri-state) and calls `isContainedIn` directly; `isPathContained` gets its
 * containment DECISION from the canonical `tryWithinRoot` predicate instead
 * (ADR-4650 decision 6) and never called this comparison directly. Every
 * caller owns its own resolution.
 */

/**
 * Containment check for a path (file OR directory), used where the caller
 * does not need to distinguish "target vanished / broken symlink" from
 * "target resolved but escapes root" — both degrade the same way at every
 * call site that uses this (an escaped or unresolvable phase directory is
 * treated identically to an unreadable one). `readDocument` below needs
 * that distinction for its own exists/readable tri-state, so it keeps its
 * own inline `realpathSync` calls and calls `isContainedIn` directly instead
 * of this wrapper.
 *
 * The containment DECISION comes from the canonical `tryWithinRoot`
 * predicate (ADR-4650 decision 6: a wrapper may decide HOW to degrade,
 * never WHETHER a path is contained). Must-exist stays this module's OWN
 * degradation condition, applied after: `tryWithinRoot` deliberately accepts
 * a not-yet-created path under the root (ancestor-walk realpath), but every
 * caller of `isPathContained` guards an `fs` read that is about to happen
 * against an already-existing directory, so a vanished/unresolvable path
 * must still degrade the same as an escaped one.
 */
function isPathContained(target: string, root: string): boolean {
  if (tryWithinRoot(target, root, PathAcceptance.AbsoluteInsideRoot) === null) return false;
  try {
    fs.realpathSync(target);
  } catch {
    return false;
  }
  return true;
}

function readDocument(filePath: string, root: string): { text: string | null; exists: boolean; readable: boolean } {
  let stat: fs.Stats;
  try {
    stat = fs.statSync(filePath);
  } catch {
    return { text: null, exists: false, readable: false };
  }
  // A directory, socket, or symlink resolving to a device in a document
  // position is not a document. Reject before any open (cf. #2378/#2383).
  if (!stat.isFile()) return { text: null, exists: true, readable: false };

  let realTarget: string;
  let realRoot: string;
  try {
    realTarget = fs.realpathSync(filePath);
    realRoot = fs.realpathSync(root);
  } catch {
    // A broken symlink, or the path vanished between the stat above and
    // here — the same non-answer `readDocument` already gives "not exists".
    return { text: null, exists: false, readable: false };
  }
  if (!isContainedIn(realTarget, realRoot)) {
    return { text: null, exists: true, readable: false };
  }

  try {
    // #3707-CR follow-up MAJOR: normalize line endings HERE, at this module's
    // one shared document-read seam, so a lone-CR document (CommonMark line
    // ending; a document using it renders as separate lines to a human
    // reader) is normalized by construction for every current and future
    // caller of `readDocument` (`buildRequirements`, `buildUatRows`, the
    // ROADMAP.md read above) — not only the ones a parser author remembered
    // to fix individually. Mirrors `src/uat.cts`'s `readNormalizedDocument`,
    // the equivalent boundary for `cmdAuditUat`; both now delegate to the
    // same `normalizeLineEndings` in `core-utils.cts`.
    return { text: normalizeLineEndings(fs.readFileSync(filePath, 'utf-8')), exists: true, readable: true };
  } catch {
    return { text: null, exists: true, readable: false };
  }
}

/**
 * Containment-enforcing `fs` seam for `readVerificationStatus`
 * (`src/verification.cts`), passed through that function's existing
 * `opts.fs` injection point — GAP 2 of the #2790 follow-up security review.
 *
 * `readVerificationStatus` is a SHARED owner consumed by many commands
 * (init, roadmap, phase, ship, …), so it must not gain a containment
 * parameter of its own; the boundary is enforced HERE, at this consumer's
 * call site, instead. Each method below delegates to the real `node:fs`
 * ONLY after the given path passes `isPathContained` against
 * `planningRoot` — otherwise it throws. `readVerificationStatus` already
 * treats every one of these calls' failures as its no-throw "missing"
 * degradation (see its own try/catch around `readdirSync`/`readFileSync`,
 * and `findStaleVerificationSummary`'s around `readdirSync`/`statSync`), so
 * a `*-VERIFICATION.md` symlinked outside the planning root — or a phase
 * directory that is itself such a symlink — now degrades to the ordinary
 * 'missing' status instead of leaking frontmatter content (or the escaped
 * directory's filenames) into the payload.
 */
function containmentEnforcingVerificationFs(planningRoot: string): {
  readdirSync(dir: string): string[];
  readFileSync(filePath: string, encoding: 'utf-8'): string;
  statSync(filePath: string): { mtimeMs: number; isFile(): boolean };
} {
  function assertContained(target: string): void {
    if (!isPathContained(target, planningRoot)) {
      throw new Error(`planning-inspect: path escapes planning root: ${toPosix(target)}`);
    }
  }
  return {
    readdirSync(dir: string): string[] {
      assertContained(dir);
      return fs.readdirSync(dir);
    },
    readFileSync(filePath: string, encoding: 'utf-8'): string {
      assertContained(filePath);
      return fs.readFileSync(filePath, encoding);
    },
    statSync(filePath: string): { mtimeMs: number; isFile(): boolean } {
      assertContained(filePath);
      return fs.statSync(filePath);
    },
  };
}

function sortedUnique(values: string[]): string[] {
  return [...new Set(values)].sort();
}

// ─── Requirements ─────────────────────────────────────────────────────────────

interface RequirementRow {
  id: string;
  text: string | null;
  /** `true` / `false` from the checkbox, or `unknown` when no checkbox exists. */
  complete: boolean | 'unknown';
  /** Phase tokens the Traceability table maps this requirement to. */
  mappedPhases: string[];
  /**
   * Correlation convenience: the CODES (never prose) of the diagnostics this
   * module raised for THIS requirement. The global `diagnostics[]` array
   * remains the sole authoritative record — this is a lookup shortcut so a
   * consumer does not have to string-parse `diagnostics[].subject` (e.g.
   * `"AUTH-02->9"`) to correlate a diagnostic back to a row.
   */
  diagnostics: InspectDiagnosticCode[];
  scope: Scope;
}

/**
 * Prefix-agnostic requirement-ID format shared with `parseRequirements`
 * (`src/gap-checker.cts`) — REQ-01, TST-01, BACK-07, INSP-04, etc. Bold
 * markers (`**ID**`) are optional decoration, matching how `gap-checker.cts`
 * pulls the ID out of a checkbox bullet's text.
 */
const ID_PATTERN = '[A-Z][A-Z0-9]*-[A-Za-z0-9_-]+';

/**
 * A Traceability table's `Requirement` cell holds ONLY the ID (mod optional
 * bold + surrounding whitespace) — full-match, mirroring the pipe-bounded
 * anchoring the prior hand-rolled `ID_CELL` regex enforced.
 */
const CELL_ID_RE = new RegExp(`^\\*{0,2}(${ID_PATTERN})\\*{0,2}$`);

/**
 * A checkbox bullet's leading `**ID**` — prefix match only (no end anchor):
 * trailing prose (`: description`, ` some text`) is not required to match,
 * mirroring the prior hand-rolled `BULLET` regex.
 */
const BULLET_ID_RE = new RegExp(`^\\*{0,2}(${ID_PATTERN})\\*{0,2}`);

/**
 * Parse the `## Traceability` table's `Requirement | Phase | Status` rows via
 * the canonical `markdown-table` seam (ADR-2143) — never a hand-rolled
 * table/row regex. A missing/malformed section or table, or a header that
 * doesn't match the `RequirementsTraceability` schema, yields an EMPTY map: a
 * malformed table is a non-answer, and every requirement then falls through
 * to the caller's own `REQUIREMENT_UNMAPPED` diagnostic.
 */
function parseTraceability(reqMd: string): Map<string, string[]> {
  const byId = new Map<string, string[]>();
  const section = collectSection(reqMd, (h) => /^traceability$/i.test(h.text.trim()));
  if (!section) return byId;

  const parsed = parseMarkdownTable(section.body);
  if (!parsed.ok) return byId;

  const schema = matchTableSchema(parsed.value.columns);
  if (!schema || schema.id !== 'RequirementsTraceability') return byId;

  for (const row of parsed.value.rows) {
    const idMatch = CELL_ID_RE.exec((row.Requirement ?? '').trim());
    if (!idMatch) continue;
    const id = idMatch[1];
    // `Phase 1`, `1`, `Phase 1, Phase 2` — the token is what a consumer can
    // match against a phase id; the surrounding word is decoration. This is
    // value-level parsing of ONE already-addressed cell, not markdown parsing.
    const tokens = [...(row.Phase ?? '').matchAll(/\d+(?:\.\d+)*/g)].map((t) => t[0]);
    const existing = byId.get(id);
    if (existing) existing.push(...tokens);
    else byId.set(id, tokens);
  }
  return byId;
}

/**
 * Checkbox completion state per requirement ID, from the `- [x] **ID**`
 * bullets — driven by the canonical `iterateBullets` seam, same bold-ID
 * extraction style as `parseRequirements` (`src/gap-checker.cts`). A
 * requirement with no bullet has no checkbox answer — reported as `unknown`,
 * never defaulted to `false`.
 */
function parseCheckboxStates(reqMd: string): Map<string, boolean> {
  const states = new Map<string, boolean>();
  for (const bullet of iterateBullets(reqMd)) {
    if (bullet.marker !== 'checkbox-checked' && bullet.marker !== 'checkbox-unchecked') continue;
    const m = BULLET_ID_RE.exec(bullet.text);
    if (!m) continue;
    // First occurrence wins, matching parseRequirements' own `seen` set.
    if (!states.has(m[1])) states.set(m[1], bullet.marker === 'checkbox-checked');
  }
  return states;
}

/** IDs appearing more than once in the checkbox bullets, in document order. */
function findDuplicateIds(reqMd: string): string[] {
  const seen = new Set<string>();
  const dupes: string[] = [];
  for (const bullet of iterateBullets(reqMd)) {
    if (bullet.marker !== 'checkbox-checked' && bullet.marker !== 'checkbox-unchecked') continue;
    const m = BULLET_ID_RE.exec(bullet.text);
    if (!m) continue;
    if (seen.has(m[1])) dupes.push(m[1]);
    else seen.add(m[1]);
  }
  return dupes;
}

function buildRequirements(
  requirementsPath: string,
  knownPhaseKeys: Set<string>,
  diagnostics: Diagnostic[],
  planningRoot: string,
): { rows: RequirementRow[]; scope: Scope } {
  const doc = readDocument(requirementsPath, planningRoot);
  if (!doc.exists) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.REQUIREMENTS_ABSENT,
      subject: toPosix(requirementsPath),
      detail: 'REQUIREMENTS.md does not exist; no requirement rows are available.',
    });
    return { rows: [], scope: SCOPE.UNSCOPED };
  }
  if (!doc.readable || doc.text === null) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.REQUIREMENTS_UNREADABLE,
      subject: toPosix(requirementsPath),
      detail: 'REQUIREMENTS.md exists but could not be read; zero rows is not a reliable answer.',
    });
    return { rows: [], scope: SCOPE.UNREADABLE };
  }

  const reqMd = doc.text;
  const items = parseRequirements(reqMd);
  const traceability = parseTraceability(reqMd);
  const checkboxes = parseCheckboxStates(reqMd);

  const dupeIds = findDuplicateIds(reqMd);
  for (const dupe of dupeIds) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.REQUIREMENT_DUPLICATE,
      subject: dupe,
      detail: 'Requirement ID appears more than once; the first occurrence is authoritative.',
    });
  }
  const duplicateIdSet = new Set(dupeIds);

  const rows: RequirementRow[] = items.map((item: { id: string; text: string }) => {
    const mappedPhases = sortedUnique(traceability.get(item.id) ?? []);
    const hasCheckbox = checkboxes.has(item.id);
    const complete: boolean | 'unknown' = hasCheckbox ? (checkboxes.get(item.id) as boolean) : 'unknown';
    const rowDiagnostics: InspectDiagnosticCode[] = [];

    if (duplicateIdSet.has(item.id)) {
      rowDiagnostics.push(INSPECT_DIAGNOSTIC.REQUIREMENT_DUPLICATE);
    }
    if (mappedPhases.length === 0) {
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.REQUIREMENT_UNMAPPED,
        subject: item.id,
        detail: 'No Traceability row maps this requirement to a phase.',
      });
      rowDiagnostics.push(INSPECT_DIAGNOSTIC.REQUIREMENT_UNMAPPED);
    }
    for (const token of mappedPhases) {
      // `phaseKeyFromDir` and `phaseKeyFromToken` are the canonical pair for
      // phase-IDENTITY equality: both map a directory name and a document
      // token onto the same canonical zero-padded key, so `01-auth` /
      // `1-auth` / `Phase 1` / `Phase 01` are recognized as one phase, and
      // decimal phases (`1.1`) compare correctly. A raw string compare gets
      // the padding case wrong; `phaseTokenMatches` is the wrong primitive
      // here too — it is a FILE-MEMBERSHIP predicate (#3511) for aggregate
      // `*-UAT.md` / `*-VERIFICATION.md` scans, not a phase-identity equality
      // test, and is unreliable for decimal phases.
      if (!knownPhaseKeys.has(phaseKeyFromToken(token))) {
        diagnostics.push({
          code: INSPECT_DIAGNOSTIC.REQUIREMENT_PHASE_UNKNOWN,
          subject: `${item.id}->${token}`,
          detail: 'Traceability maps this requirement to a phase that is not present on disk.',
        });
        rowDiagnostics.push(INSPECT_DIAGNOSTIC.REQUIREMENT_PHASE_UNKNOWN);
      }
    }
    if (complete === 'unknown') {
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.REQUIREMENT_COMPLETION_UNKNOWN,
        subject: item.id,
        detail: 'Requirement has no checkbox bullet; completion is unknown, not incomplete.',
      });
      rowDiagnostics.push(INSPECT_DIAGNOSTIC.REQUIREMENT_COMPLETION_UNKNOWN);
    }

    return {
      id: item.id,
      text: item.text && item.text.length > 0 ? item.text : null,
      complete,
      mappedPhases,
      diagnostics: rowDiagnostics,
      scope: SCOPE.COMPLETE,
    };
  });

  return { rows, scope: SCOPE.COMPLETE };
}

// ─── Summary provenance ───────────────────────────────────────────────────────

interface SummaryProvenance {
  /** `## Files Created/Modified` — a PLAN-level list. Never attributed to a task. */
  planFiles: string[];
  /** Task index -> files, from a deviation block naming `Found during: Task N`. */
  byTask: Map<number, string[]>;
}

/**
 * Parse a SUMMARY.md body for file provenance.
 *
 * Two DIFFERENT scopes live in this document and conflating them is the whole
 * hazard: `## Files Created/Modified` describes the PLAN, while a deviation
 * block's `**Files modified:**` is attributed to the task its `**Found during:**
 * Task N` line names. Only the latter is task-scoped.
 */
function parseSummaryProvenance(content: string): SummaryProvenance {
  const planFiles: string[] = [];
  const byTask = new Map<number, string[]>();

  // `## Files Created/Modified` — a PLAN-level bullet list. Bounded to the
  // section body via collectSection + iterateBullets; absent is not an error.
  const filesSection = collectSection(content, (h) => /^files\s+created\/modified\s*$/i.test(h.text.trim()));
  if (filesSection) {
    for (const bullet of iterateBullets(filesSection.body)) {
      // `- \`path/to/file.ts\` - What it does`
      const m = /^`([^`]+)`/.exec(bullet.text);
      if (m) planFiles.push(m[1].trim());
    }
  }

  // `## Deviations from Plan` (also matches the `(Auto-fixed)` variant) — the
  // `**Found during:** Task N` / `**Files modified:**` scan is a regex
  // CONFINED to this already-collected section body (ADR-2143 §4 sanctioned
  // pattern), never a document-wide heading walk.
  const deviationsSection = collectSection(content, (h) => /^deviations\s+from\s+plan/i.test(h.text.trim()));
  if (deviationsSection) {
    let currentTask: number | null = null;
    for (const line of deviationsSection.body.split(/\r?\n/)) {
      const foundDuring = /\*\*Found during:\*\*\s*Task\s*(\d+)/i.exec(line);
      if (foundDuring) {
        currentTask = parseInt(foundDuring[1], 10);
        continue;
      }

      const filesModified = /\*\*Files modified:\*\*\s*(.+)$/i.exec(line);
      if (filesModified && currentTask !== null) {
        const files = filesModified[1]
          .split(',')
          .map((f) => f.trim().replace(/^`|`$/g, ''))
          .filter((f) => f.length > 0);
        const existing = byTask.get(currentTask);
        if (existing) existing.push(...files);
        else byTask.set(currentTask, files);
      }
    }
  }

  return { planFiles: sortedUnique(planFiles), byTask };
}

// ─── Plans and tasks ──────────────────────────────────────────────────────────

interface TaskRow {
  index: number;
  kind: string;
  type: string | null;
  name: string | null;
  plannedFiles: string[];
  acceptanceCriteria: string[];
  done: string | null;
  /** `null` unless the SUMMARY attributes files to THIS task. */
  changedFiles: string[] | null;
  provenance: Provenance;
  agreement: Agreement;
  status: TaskStatus;
}

interface PlanRow {
  id: string;
  file: string;
  superseded: boolean;
  objective: string | null;
  wave: number | null;
  dependsOn: string[];
  autonomous: boolean;
  agentHint: string | null;
  /** From the plan's own frontmatter `files_modified`. */
  plannedFiles: string[];
  /** Plan-scoped `## Files Created/Modified`. `null` when no SUMMARY exists. */
  changedFiles: string[] | null;
  hasSummary: boolean;
  tasks: TaskRow[];
  scope: Scope;
}

/** Pair a plan file with its SUMMARY by the canonical id embedded in the name. */
function summaryForPlan(planFile: string, summaryFiles: string[]): string | null {
  const base = path.basename(planFile);
  const key = base.replace(/-?PLAN/i, '').replace(/\.md$/i, '');
  const dir = planFile.includes('/') ? planFile.slice(0, planFile.lastIndexOf('/') + 1) : '';
  for (const candidate of summaryFiles) {
    if (!candidate.startsWith(dir)) continue;
    const candidateKey = path.basename(candidate).replace(/-?SUMMARY/i, '').replace(/\.md$/i, '');
    if (candidateKey === key) return candidate;
  }
  return null;
}

function buildTaskRows(
  planFile: string,
  parsed: ReturnType<typeof parsePlanDocument>,
  provenance: SummaryProvenance | null,
  diagnostics: Diagnostic[],
): TaskRow[] {
  return parsed.tasks.map((task) => {
    if (task.kind === TASK_KIND.CHECKPOINT) {
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.TASK_SHAPE_CHECKPOINT,
        subject: `${toPosix(planFile)}#${task.index}`,
        detail: 'Checkpoint task: the grammar carries no name/files/acceptance elements.',
      });
    }

    if (provenance === null) {
      return {
        index: task.index,
        kind: task.kind,
        type: task.type,
        name: task.name,
        plannedFiles: task.plannedFiles,
        acceptanceCriteria: task.acceptanceCriteria,
        done: task.done,
        changedFiles: null,
        provenance: PROVENANCE.ABSENT,
        agreement: AGREEMENT.UNKNOWN,
        status: TASK_STATUS.PENDING,
      };
    }

    const attributed = provenance.byTask.get(task.index);
    if (attributed === undefined) {
      // A SUMMARY exists but says nothing about THIS task. The plan-level file
      // list is not evidence about a task — attributing it would be inference.
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.TASK_CHANGED_FILES_PLAN_SCOPED,
        subject: `${toPosix(planFile)}#${task.index}`,
        detail: 'SUMMARY carries only a plan-level file list; task-scoped changed files are unknown.',
      });
      return {
        index: task.index,
        kind: task.kind,
        type: task.type,
        name: task.name,
        plannedFiles: task.plannedFiles,
        acceptanceCriteria: task.acceptanceCriteria,
        done: task.done,
        changedFiles: null,
        provenance: PROVENANCE.PLAN_SCOPED,
        agreement: AGREEMENT.UNKNOWN,
        status: TASK_STATUS.UNKNOWN,
      };
    }

    const changed = sortedUnique(attributed);
    const planned = sortedUnique(task.plannedFiles);
    let agreement: Agreement = AGREEMENT.UNKNOWN;
    if (planned.length > 0) {
      const same = planned.length === changed.length && planned.every((f, i) => f === changed[i]);
      agreement = same ? AGREEMENT.AGREED : AGREEMENT.CONFLICTING;
      if (!same) {
        diagnostics.push({
          code: INSPECT_DIAGNOSTIC.TASK_CHANGED_FILES_CONFLICTING,
          subject: `${toPosix(planFile)}#${task.index}`,
          detail: 'Planned and changed file sets disagree; both are reported verbatim, unreconciled.',
        });
      }
    }

    return {
      index: task.index,
      kind: task.kind,
      type: task.type,
      name: task.name,
      plannedFiles: task.plannedFiles,
      acceptanceCriteria: task.acceptanceCriteria,
      done: task.done,
      changedFiles: changed,
      provenance: PROVENANCE.TASK_SCOPED,
      agreement,
      status: TASK_STATUS.DONE,
    };
  });
}

function buildPlanRows(phaseDir: string, diagnostics: Diagnostic[], planningRoot: string): { rows: PlanRow[]; scope: Scope } {
  // GAP 1 (#2790 follow-up security review): `scanPhasePlans` (`plan-scan.cjs`)
  // does its own `readdirSync(phaseDir)`, which FOLLOWS a directory symlink —
  // so a phase directory that is itself a symlink escaping `planningRoot`
  // would have its EXTERNAL filenames enumerated and surfaced via `file:
  // toPosix(planFile)` below, even though the per-file `readDocument` guard
  // already rejects the CONTENT. Contained before any enumeration happens, so
  // an escaped phase directory contributes zero rows and zero filenames — the
  // same degraded shape (`scope: unreadable`, empty `rows`) `scanPhasePlans`
  // already returns when the directory cannot be listed at all, via the same
  // `isPathContained` comparison `readDocument` uses for files (never a
  // second, hand-rolled boundary check).
  if (!isPathContained(phaseDir, planningRoot)) {
    return { rows: [], scope: SCOPE.UNREADABLE };
  }
  const scan = planScan(phaseDir);
  const supersededSet = new Set(
    scan.allPlanFiles.filter((f: string) => !scan.planFiles.includes(f)),
  );

  const rows: PlanRow[] = scan.allPlanFiles.map((planFile: string) => {
    const doc = readDocument(path.join(phaseDir, planFile), planningRoot);
    if (doc.text === null) {
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.PLAN_UNREADABLE,
        subject: toPosix(planFile),
        detail: 'Plan file could not be read; its body is unknown. Sibling plans are unaffected.',
      });
      return {
        id: planIdFromFile(planFile),
        file: toPosix(planFile),
        superseded: supersededSet.has(planFile),
        objective: null,
        wave: null,
        dependsOn: [],
        autonomous: true,
        agentHint: null,
        plannedFiles: [],
        changedFiles: null,
        hasSummary: false,
        tasks: [],
        scope: SCOPE.UNREADABLE,
      };
    }

    const parsed = parsePlanDocument(doc.text);
    const summaryFile = summaryForPlan(planFile, scan.summaryFiles);
    let provenance: SummaryProvenance | null = null;
    if (summaryFile !== null) {
      const summaryDoc = readDocument(path.join(phaseDir, summaryFile), planningRoot);
      if (summaryDoc.text === null) {
        diagnostics.push({
          code: INSPECT_DIAGNOSTIC.SUMMARY_UNREADABLE,
          subject: toPosix(summaryFile),
          detail: 'Summary file could not be read; file provenance for this plan is unknown.',
        });
      } else {
        provenance = parseSummaryProvenance(summaryDoc.text);
      }
    }

    return {
      id: planIdFromFile(planFile),
      file: toPosix(planFile),
      superseded: supersededSet.has(planFile),
      objective: parsed.objective,
      wave: parsed.declaredWave,
      dependsOn: parsed.dependsOn,
      autonomous: parsed.autonomous,
      agentHint: parsed.agentHint,
      plannedFiles: parsed.filesModified,
      changedFiles: provenance === null ? null : provenance.planFiles,
      hasSummary: summaryFile !== null,
      tasks: buildTaskRows(planFile, parsed, provenance, diagnostics),
      scope: SCOPE.COMPLETE,
    };
  });

  return { rows, scope: scan.scope };
}

// ─── UAT ──────────────────────────────────────────────────────────────────────

// `scope` and `foldScope` are, by decision, identical at every return site in
// this function as of #3078 round-8 — they are not accidentally in sync. The
// two-field shape is kept anyway because it lets `scope` (the row's own
// honest answer) and `foldScope` (what the caller folds into the milestone)
// diverge again later without a signature change, should some future gap
// class need to be reported on the row but exempted from the fold, or vice
// versa. If you find yourself "simplifying" this to one field, don't.
function buildUatRows(
  phasesDir: string,
  phaseDirName: string,
  diagnostics: Diagnostic[],
  planningRoot: string,
): { items: unknown[]; scope: Scope; foldScope: Scope } {
  const phaseDir = path.join(phasesDir, phaseDirName);
  // GAP 1 (#2790 follow-up security review): same rationale as
  // `buildPlanRows` above — `readdirSync` below FOLLOWS a directory symlink,
  // so an escaped phase directory must be rejected before enumeration, not
  // after. Reuses the existing `UAT_UNREADABLE` diagnostic and degraded
  // shape (the pre-existing "directory could not be listed" path below),
  // rather than inventing a new diagnostic code for what is, from a
  // consumer's perspective, the same non-answer.
  if (!isPathContained(phaseDir, planningRoot)) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.UAT_UNREADABLE,
      subject: phaseDirName,
      detail: 'Phase directory could not be listed; UAT presence is unknown.',
    });
    return { items: [], scope: SCOPE.UNREADABLE, foldScope: SCOPE.UNREADABLE };
  }
  let entries: string[];
  try {
    entries = fs.readdirSync(phaseDir);
  } catch {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.UAT_UNREADABLE,
      subject: phaseDirName,
      detail: 'Phase directory could not be listed; UAT presence is unknown.',
    });
    return { items: [], scope: SCOPE.UNREADABLE, foldScope: SCOPE.UNREADABLE };
  }

  const uatFiles = selectPhaseUatFiles(entries, phaseDirName);
  if (uatFiles.length === 0) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.UAT_ABSENT,
      subject: phaseDirName,
      detail: 'No UAT document for this phase. This does not affect phase acceptance.',
    });
    return { items: [], scope: SCOPE.COMPLETE, foldScope: SCOPE.COMPLETE };
  }

  const items: unknown[] = [];
  let scope: Scope = SCOPE.COMPLETE;
  let foldScope: Scope = SCOPE.COMPLETE;
  for (const file of uatFiles) {
    const doc = readDocument(path.join(phaseDir, file), planningRoot);
    if (doc.text === null) {
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.UAT_UNREADABLE,
        subject: `${phaseDirName}/${file}`,
        detail: 'UAT document exists but could not be read.',
      });
      scope = SCOPE.TRUNCATED;
      foldScope = SCOPE.TRUNCATED;
      continue;
    }
    // #3707-class false-clean, second surface (security review finding 1):
    // `parseUatItemsWithStats`'s `headingsSeen` counts `### N.` test blocks
    // that yielded ZERO items (a row missing its `result:` line, or otherwise
    // unrecognised) — the audit-uat side (`cmdAuditUat`, above) already flags
    // this as `parse_gap`. Reading the file successfully is not the same as
    // deriving every row from it, so the gap is ALWAYS REPORTED.
    //
    // #3078 round-8 HIGH — NO FRONTMATTER KILL SWITCH. There is deliberately
    // no `status !== 'complete'` term here. `cmdAuditUat` dropped its own such
    // guard (see the long rationale at src/uat.cts, above `headingsSeen > 0`):
    // a terminal status is an ASSERTION BY THE AUTHOR, and an assertion must
    // not be able to switch off the detector that would contradict it. A guard
    // here let one word of frontmatter turn a fence-straddled `result: blocked`
    // into an affirmative `scope: "complete"` with ZERO diagnostics. The
    // condition is `headingsSeen > 0` alone, matching src/uat.cts's own check
    // line for line. Do not re-add a status term to "align the surfaces" — the
    // surfaces are aligned precisely BY its absence.
    //
    // #3078 round-8 — REPORTING THE GAP AND WITHHOLDING THE PERCENTAGE ARE TWO
    // DIFFERENT DECISIONS, so they get two different fields. `scope` is what
    // this phase's own `uat.scope` reports: it stays honest and goes TRUNCATED
    // for every gap, because a document that did not yield all its rows must
    // never carry an affirmative `"complete"`. `foldScope` is what is handed to
    // `worstScope` in the caller, and it is the one with teeth — a non-COMPLETE
    // fold raises `phase_scope_degraded` AND, via `phaseScope`/`makeFraction`,
    // withholds BOTH progress percentages for the WHOLE milestone.
    //
    // The two now agree: EVERY gap class degrades both, including the
    // fence-suppression shortfall. `shortfallBlocks` is not exempted here
    // because it is a single tally incremented at ONE site in the scan and
    // spans BOTH a harmless closed-fence documentation sample AND a genuinely
    // fence-straddled `result: blocked` row — exempting the tally cannot
    // exempt only the harmless case, it also publishes a milestone percentage
    // over a real unread outstanding row. `SCOPE.TRUNCATED` means the scan
    // could not SEE part of the evidence (src/planning-scope.cts), which is
    // exactly the fence-straddled case. The accepted over-report itself is
    // unchanged and still documented at src/uat.cts; what changed is only
    // that it no longer buys an exemption from the fold.
    const { items: fileItems, headingsSeen } = parseUatItemsWithStats(doc.text);
    items.push(...fileItems);
    if (headingsSeen > 0) {
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.UAT_UNREADABLE,
        subject: `${phaseDirName}/${file}`,
        detail: `UAT document has ${headingsSeen} test block(s) with no parseable result; unresolved is not a complete answer.`,
      });
      scope = SCOPE.TRUNCATED;
      foldScope = SCOPE.TRUNCATED;
    }
  }
  return { items, scope, foldScope };
}

// ─── Progress ─────────────────────────────────────────────────────────────────

/**
 * ADR-3180 §7.6: the arithmetic is `clampPercent`'s alone (rule 1), a
 * non-positive denominator is 0 not 100 (rule 2), numerator and denominator
 * come from one scoped set (rule 3), and a scope other than COMPLETE renders NO
 * percentage at all (rule 4).
 */
function makeFraction(completed: number, total: number, scope: Scope, subject: string, diagnostics: Diagnostic[]): Fraction {
  if (scope !== SCOPE.COMPLETE) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.PERCENT_WITHHELD,
      subject,
      detail: `Scope is "${scope}"; a percentage derived from an incomplete read would be a confident wrong answer.`,
    });
    return { completed, total, percent: null, scope };
  }
  return { completed, total, percent: clampPercent(completed, total), scope };
}

/**
 * The active plan position, from STATE.md's `## Current Position` block.
 *
 * ADR-3180 §7.7: `stateFieldValue` owns the #1760 frontmatter-then-body
 * fallback ladder — this composes it, it does not re-derive it. The section
 * slice is load-bearing: `Plan:` canonically lives under `## Current Position`,
 * and a whole-document search would match a historical `Plan:` line in an
 * archive section instead (#2956). A missing section is therefore reported as
 * UNSCOPED rather than silently widened to the whole body.
 */
function buildActivePlan(statePath: string, planningRoot: string): { value: string | null; scope: Scope } {
  const doc = readDocument(statePath, planningRoot);
  if (!doc.exists) return { value: null, scope: SCOPE.UNSCOPED };
  if (!doc.readable || doc.text === null) return { value: null, scope: SCOPE.UNREADABLE };
  const fm = extractFrontmatter(doc.text, statePath) as Record<string, unknown>;
  const body = stripFrontmatter(doc.text);
  const slice = stateCurrentPositionSlice(body);
  return stateFieldValue(fm, slice ?? body, 'plan', 'Plan', {
    scope: slice === null ? SCOPE.UNSCOPED : SCOPE.COMPLETE,
  });
}

// ─── Phase ROADMAP section (goal / dependencies) ──────────────────────────────

interface ScopedText {
  value: string | null;
  scope: Scope;
}

interface ScopedTextList {
  value: string[];
  scope: Scope;
}

/**
 * The same `**Depends on:**` line `src/phase.cts`'s phase-insert path writes
 * (`\n**Depends on:** Phase ${afterPhase}`) and `init.cts`'s own
 * phase-listing scan reads (`init.cts:2359`) — mirrored verbatim here rather
 * than re-derived.
 */
const DEPENDS_ON_LINE_RE = /\*\*Depends on(?::\*\*|\*\*:)\s*([^\n]+)/i;

/**
 * A bold-annotation line — `**Label:** …` (colon inside the bold run) or
 * `**Label**: …` (colon immediately after it). Matches `**Depends on:**`,
 * `**Plans**:`, `**Goal:**`, and `**Cross-cutting constraints:**` alike.
 */
const BOLD_ANNOTATION_LINE_RE = /^\*\*(?:[^*\n]*:[^*\n]*\*\*|[^*\n]*\*\*:)/;

/** The bare `Plans:` checklist header `cmdRoadmapAnnotateDependencies` emits. */
const PLANS_CHECKLIST_HEADER_RE = /^plans:$/i;

/**
 * The prose immediately under a `### Phase N: Name` heading, stopping at the
 * first line that is METADATA rather than prose — issue #2790's own
 * definition of per-phase "goal". The boundary matters because this payload
 * already surfaces every one of those metadata lines in its own typed field
 * (`**Depends on:**` -> `dependencies`, `**Plans**:` / `Plans:` + `- [ ]`
 * rows -> `plans`, wave headers and `**Cross-cutting constraints:**` -> the
 * per-plan rows) — folding them into `goal` too would both duplicate the
 * data and hand a consumer raw Markdown to render. A sub-heading boundary is
 * belt-and-braces: `collectSection` already bounds the body at the next
 * heading.
 *
 * `null` when the section carries no such prose before hitting metadata (a
 * real "no goal", not a failure).
 */
function extractGoalProse(sectionBody: string): string | null {
  const proseLines: string[] = [];
  for (const line of sectionBody.split(/\r?\n/)) {
    const trimmed = line.trim();
    if (/^\s{0,3}#{1,6}\s/.test(line)) break;
    if (/^\s*(?:[-*+]|\d+[.)])\s/.test(line)) break;
    if (BOLD_ANNOTATION_LINE_RE.test(trimmed)) break;
    if (PLANS_CHECKLIST_HEADER_RE.test(trimmed)) break;
    proseLines.push(line);
  }
  const text = proseLines.join('\n').trim();
  return text.length > 0 ? text : null;
}

/**
 * Phase tokens off a `**Depends on:**` line — value-level token extraction
 * of ONE already-addressed line (mirrors `parseTraceability`'s Phase-cell
 * token scan above), never a document-wide scan. `[]` when the line is
 * absent.
 */
function extractDependencyTokens(sectionBody: string): string[] {
  const m = DEPENDS_ON_LINE_RE.exec(sectionBody);
  if (!m) return [];
  return sortedUnique([...m[1].matchAll(/\d+(?:\.\d+)*/g)].map((t) => t[0]));
}

/**
 * This phase's own ROADMAP.md section body — milestone-scoped via the SAME
 * `extractCurrentMilestone` seam `planning-snapshot.cts`'s own ROADMAP
 * consumers use (`planning-snapshot.cts:918`), never a document-wide walk.
 * `collectSection` (ADR-2143) owns the heading walk; the predicate is built
 * from the canonical `phaseMarkdownRegexSource` (`phase-id.cts`) anchor —
 * the same start-of-heading anchor `roadmap-parser.cts`'s own phase-section
 * lookups (`withPhaseSection`, `findRoadmapPhaseInContent`) use, so a
 * sibling phase whose TITLE merely mentions this phase's number is never
 * hijacked.
 */
function findPhaseRoadmapSection(cwd: string, roadmapText: string, phaseId: string): string | null {
  const scoped = extractCurrentMilestone(roadmapText, cwd);
  const headingRe = new RegExp(
    `^(?:\\[[^\\]]{1,200}\\]\\s*)?Phase\\s+${phaseMarkdownRegexSource(phaseId)}(?=[\\s:(]|$)`,
    'i',
  );
  const section = collectSection(scoped, (h) => headingRe.test(h.text));
  return section ? section.body : null;
}

/**
 * Issue #2790's Summary names "per-phase goal/dependency" as spec elements
 * distinct from the STATUS evidence (`verification` / `roadmap_acceptance` /
 * `uat`) phase rows already carry. Both fields fold the SAME three-way scope
 * every other value in this module carries: `complete` when the section was
 * found and parsed, `unscoped` when ROADMAP.md has no section for this
 * phase, `unreadable` when ROADMAP.md itself could not be read. Never
 * inferred — an absent `**Depends on:**` line is `[]`, not a degraded scope.
 *
 * `getRoadmapPhaseWithFallback` (`roadmap.cts`) and `findRoadmapPhaseInContent`
 * (`roadmap-parser.cts`) were considered first (per this module's own
 * "COMPOSED, NOT RE-DERIVED" rule) but both perform their OWN internal file
 * read, bypassing this module's `readDocument` tri-state (exists/readable/
 * text) — the exact distinction `unreadable` vs `unscoped` needs here, and
 * the one every other section of this module gets via the same seam. Their
 * `goal` extraction also targets an explicit `**Goal:**` bold line, not the
 * free prose immediately under the heading the issue's own fixture expects.
 * `collectSection` + `extractCurrentMilestone`, fed by this module's own
 * `readDocument(paths.roadmap)` read, keeps both the read path and the
 * "found vs missing vs unreadable" distinction singular.
 */
function buildPhaseGoalAndDependencies(
  cwd: string,
  roadmapDoc: { text: string | null; readable: boolean },
  phaseId: string | null,
  phaseDirLabel: string,
  diagnostics: Diagnostic[],
): { goal: ScopedText; dependencies: ScopedTextList } {
  if (!roadmapDoc.readable || roadmapDoc.text === null) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.ROADMAP_UNSCOPED,
      subject: phaseDirLabel,
      detail: 'ROADMAP.md could not be read; phase goal and dependencies are unknown, not empty.',
    });
    return {
      goal: { value: null, scope: SCOPE.UNREADABLE },
      dependencies: { value: [], scope: SCOPE.UNREADABLE },
    };
  }
  if (phaseId === null) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.ROADMAP_UNSCOPED,
      subject: phaseDirLabel,
      detail: 'Phase directory name carries no recognizable phase number; ROADMAP section cannot be located.',
    });
    return {
      goal: { value: null, scope: SCOPE.UNSCOPED },
      dependencies: { value: [], scope: SCOPE.UNSCOPED },
    };
  }
  const sectionBody = findPhaseRoadmapSection(cwd, roadmapDoc.text, phaseId);
  if (sectionBody === null) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.ROADMAP_UNSCOPED,
      subject: phaseDirLabel,
      detail: 'ROADMAP.md has no section for this phase; goal and dependencies are non-answers, not empty.',
    });
    return {
      goal: { value: null, scope: SCOPE.UNSCOPED },
      dependencies: { value: [], scope: SCOPE.UNSCOPED },
    };
  }
  return {
    goal: { value: extractGoalProse(sectionBody), scope: SCOPE.COMPLETE },
    dependencies: { value: extractDependencyTokens(sectionBody), scope: SCOPE.COMPLETE },
  };
}

// ─── Entry points ─────────────────────────────────────────────────────────────

function buildPlanningInspect(cwd: string): Record<string, unknown> {
  const diagnostics: Diagnostic[] = [];
  const paths = planningPaths(cwd);
  const planningExists = fs.existsSync(paths.planning);
  if (!planningExists) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.PLANNING_ROOT_ABSENT,
      subject: toPosix(paths.planning),
      detail: 'No .planning/ directory; every section below is an empty non-answer, not an empty project.',
    });
  }

  const snapshot = buildPlanningSnapshot(cwd);

  if (snapshot.milestone.scope !== SCOPE.COMPLETE) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.ROADMAP_UNSCOPED,
      subject: toPosix(paths.roadmap),
      detail: `Milestone identity scope is "${snapshot.milestone.scope}"; no version is invented to stand in for it.`,
    });
  }

  const milestoneValue = snapshot.milestone.value as { version?: string; name?: string | null } | null;

  // Phase rows come from the WINDOWED set (this milestone's phases). A dir on
  // disk that the roadmap never declares is an orphan, reported separately —
  // it is not silently promoted into `phases`, and it is not silently dropped.
  const windowed: string[] = snapshot.phaseDirs.value;
  const windowedSet = new Set(windowed);
  const orphans = snapshot.allPhaseDirNames.value
    .filter((dir) => !windowedSet.has(dir))
    .sort();
  for (const orphan of orphans) {
    diagnostics.push({
      code: INSPECT_DIAGNOSTIC.ORPHAN_PHASE_DIR,
      subject: orphan,
      detail: 'Phase directory exists on disk but is not declared in the current milestone window.',
    });
  }

  const checkboxes = snapshot.roadmapPhaseCheckboxes.value;
  // ROADMAP checkboxes arrive keyed by the BARE phase token the ROADMAP prose
  // carries ("1"), while phase rows are keyed by on-disk directory name
  // ("01-auth"). Comparing them raw makes this field null for every
  // real-world directory — an evidence channel that silently never fires.
  // Both sides go through the phase-id owners so "1", "01" and "01-auth" are
  // one phase.
  const checkboxByPhaseKey = new Map<string, boolean>();
  for (const [token, ticked] of Object.entries(checkboxes)) {
    checkboxByPhaseKey.set(phaseKeyFromToken(token), ticked);
  }
  const phaseSnapshots = snapshot.phases.value as {
    dir: string;
    complete: boolean;
    verificationStatus: string;
    planCount: number;
    summaryCount: number;
    scope: Scope;
  }[];

  // Canonical per-directory identity keys (`phase-id.cts`'s
  // `phaseKeyFromDir`), not a raw regex scrape — this is the set
  // `buildRequirements` below matches Traceability tokens against via
  // `phaseKeyFromToken`.
  const knownPhaseKeys: Set<string> = new Set(windowed.map((dir) => phaseKeyFromDir(dir)));

  // Read once, shared across every phase row's goal/dependencies lookup —
  // the same `readDocument` seam every other document read in this module
  // uses, never a second file-reading path.
  const roadmapDoc = readDocument(paths.roadmap, paths.planning);

  const phaseRows = phaseSnapshots.map((phase) => {
    const phaseDir = path.join(paths.phases, phase.dir);
    const plans = buildPlanRows(phaseDir, diagnostics, paths.planning);
    const uat = buildUatRows(paths.phases, phase.dir, diagnostics, paths.planning);
    // GAP 2 (#2790 follow-up security review): `readVerificationStatus`
    // (`src/verification.cts`) is a shared owner with its own unguarded
    // `readFileSync` — a `*-VERIFICATION.md` symlinked outside the planning
    // root would leak an unrecognized `status:` value verbatim via its
    // "Unexpected verification status '<value>'" `next_action` string. Fixed
    // from THIS consumer's side via the injectable `opts.fs` seam that
    // function already exposes, never by touching its signature — see
    // `containmentEnforcingVerificationFs`'s doc comment. This same seam's
    // `readdirSync(phaseDir)` guard also independently covers the
    // escaped-phase-DIRECTORY case for this call site (GAP 1 above only
    // gates `buildPlanRows`/`buildUatRows`, not this one).
    //
    // `src/plan-scan.cts`'s `isPlanSuperseded` similarly reads
    // symlink-followed content with no containment of its own, but it is
    // reached only via `scanPhasePlans(phaseDir)` inside `buildPlanRows`
    // above (never touched here), leaks only a derived boolean
    // (`superseded`) rather than document text, and GAP 1's directory
    // containment check already covers the escaped-DIRECTORY case for it —
    // so it needs no fix of its own.
    const verification = readVerificationStatus(phaseDir, {
      fs: containmentEnforcingVerificationFs(paths.planning),
    });

    const token = /^(\d+(?:\.\d+)*)/.exec(phase.dir);
    const phaseId = token ? token[1] : null;
    const { goal, dependencies } = buildPhaseGoalAndDependencies(cwd, roadmapDoc, phaseId, phase.dir, diagnostics);

    // `uat.foldScope`, NOT `uat.scope` (#3078 round-8). The two currently
    // agree at every call site — see `buildUatRows` for why the field is
    // still kept separate — so folding either one here produces the same
    // result today. `foldScope` is used because it is the field with teeth:
    // it is what `worstScope` folds into the phase's overall scope, and a
    // non-COMPLETE result here raises `phase_scope_degraded` and, via
    // `makeFraction`, withholds the milestone's percentages. A phase whose
    // UAT document could not be fully read must not contribute an
    // affirmative completion to the milestone.
    const folded = worstScope(phase.scope, plans.scope, uat.foldScope, goal.scope, dependencies.scope);
    if (folded !== SCOPE.COMPLETE) {
      diagnostics.push({
        code: INSPECT_DIAGNOSTIC.PHASE_SCOPE_DEGRADED,
        subject: phase.dir,
        detail: `Phase evidence is incomplete (scope "${folded}").`,
      });
    }

    return {
      dir: phase.dir,
      phase_id: phaseId,
      complete: phase.complete,
      goal,
      dependencies,
      // The three evidence sources are reported SIDE BY SIDE and never folded
      // into one verdict — folding them is precisely the confidently-wrong
      // composite ADR-3180 exists to remove.
      verification: {
        status: verification.status,
        next_action: verification.next_action ?? null,
      },
      roadmap_acceptance: {
        checkbox: checkboxByPhaseKey.has(phaseKeyFromDir(phase.dir))
          ? (checkboxByPhaseKey.get(phaseKeyFromDir(phase.dir)) as boolean)
          : null,
        // ADR-3180 §7.4: a ticked checkbox is a human annotation with no
        // machine authority. Stated in the payload so a consumer cannot
        // mistake it for a completion signal.
        authoritative: false,
      },
      uat: { unresolved: uat.items, scope: uat.scope },
      plan_count: phase.planCount,
      summary_count: phase.summaryCount,
      plans: plans.rows,
      scope: folded,
    };
  });

  const requirements = buildRequirements(paths.requirements, knownPhaseKeys, diagnostics, paths.planning);

  const phaseScope = worstScope(
    snapshot.phaseDirs.scope,
    snapshot.phases.scope,
    ...phaseRows.map((p) => p.scope),
  );
  const acceptedPhases = makeFraction(
    phaseRows.filter((p) => p.complete).length,
    phaseRows.length,
    phaseScope,
    'progress.accepted_phases',
    diagnostics,
  );
  const completedPlans = makeFraction(
    phaseRows.reduce((sum, p) => sum + p.summary_count, 0),
    phaseRows.reduce((sum, p) => sum + p.plan_count, 0),
    phaseScope,
    'progress.completed_plans',
    diagnostics,
  );

  return {
    schema_version: PLANNING_INSPECT_SCHEMA_VERSION,
    generated_from: {
      cwd: toPosix(cwd),
      planning_root: planningExists ? toPosix(paths.planning) : null,
    },
    milestone: {
      version: milestoneValue && milestoneValue.version ? milestoneValue.version : null,
      name: milestoneValue && milestoneValue.name ? milestoneValue.name : null,
      scope: snapshot.milestone.scope,
    },
    // Three DISTINCT STATE.md facts, each from its own source. Collapsing any
    // two of them is the confidently-wrong composite this schema exists to
    // avoid: `Status:` is a lifecycle label, `Plan:` is a position.
    active: {
      phase: { value: snapshot.currentPhaseLabel.value, scope: snapshot.currentPhaseLabel.scope },
      plan: buildActivePlan(paths.state, paths.planning),
      status: { value: snapshot.stateStatus.value, scope: snapshot.stateStatus.scope },
    },
    phases: phaseRows,
    orphan_phase_dirs: orphans,
    requirements: requirements.rows,
    progress: {
      accepted_phases: acceptedPhases,
      completed_plans: completedPlans,
    },
    diagnostics,
  };
}

/**
 * `planning inspect` — emit the schema-v1 snapshot.
 *
 * `output()` is the spill seam: a payload over 50 KB is written to a tmpfile and
 * returned as `@file:<path>`, which `gsd-tools`' `resolveAtFileOutput` resolves
 * transparently on stdout. Bypassing `output()` would lose that for free.
 */
function cmdPlanningInspect(cwd: string, raw: boolean): void {
  output(buildPlanningInspect(cwd), raw);
}

const planningInspect = {
  PLANNING_INSPECT_SCHEMA_VERSION,
  INSPECT_DIAGNOSTIC,
  TASK_STATUS,
  PROVENANCE,
  AGREEMENT,
  buildPlanningInspect,
  cmdPlanningInspect,
};

export = planningInspect;