/**
 * Finding-code registry — the authority for the {NNN} in `CA-{SCANNER}-{NNN}`.
 *
 * A finding ID names the CHECK, not the finding's position in a run (M-BUG-28).
 * Before this registry, `{NNN}` came from an emission counter, so the same check
 * carried different IDs on different configurations: fixing an unrelated earlier
 * gap silently renumbered every later one, and a `.config-audit-ignore` entry
 * retargeted to a neighbouring finding without the user changing anything.
 *
 * Rules for editing this file:
 *
 *   1. A number, once published, belongs to its check forever. Adding a check
 *      takes the next free number for that scanner — never the next source-order
 *      position, and never a number listed in RETIRED.
 *   2. Removing a check moves its key to RETIRED. The number is never reissued;
 *      a user's suppression must go dead rather than quietly point at a
 *      different finding. (D1 retired GAP `t3_8` under the old scheme, which is
 *      the incident that motivated the registry.)
 *   3. Several call sites may share one code when they are arms of one check —
 *      e.g. the forward/reverse arms of a permission conflict. Duplicate
 *      emission is legal; a finding is identified by (id, file, line).
 *   4. Numbers below are NOT all source order: the ones marked "documented"
 *      are pinned by README / command copy that shipped before the registry.
 *
 * GAP keys are the `GAP_CHECKS[].id` values from `feature-gap-scanner.mjs`,
 * which were already stable. They are declared here rather than derived, so
 * numbers live in exactly one place; `tests/lib/finding-codes.test.mjs` binds
 * the two together instead of a second copy of the table drifting.
 */

/**
 * @type {Record<string, Record<string, number>>}
 * scanner prefix → check key → number
 */
export const FINDING_CODES = {
  // ── CML: claude-md-linter (source order) ────────────────────────────────
  // `over-char-budget` has two call sites: the conservative 200k anchor and the
  // `--context-window` calibrated variant. One check, one code.
  CML: {
    'no-claude-md': 1,
    'nested-not-reinjected': 2,
    'over-500-lines': 3,
    'over-200-lines': 4,
    'over-char-budget': 5,
    'nearly-empty': 6,
    'missing-sections': 7,
    'no-headings': 8,
    'deep-relative-import': 9,
    'html-comments': 10,
    'repeated-content': 11,
    'todo-markers': 12,
  },

  // ── SET: settings-validator (source order) ──────────────────────────────
  SET: {
    'invalid-json': 1,
    'key-typo': 2,
    'deprecated-key': 3,
    'type-mismatch': 4,
    'invalid-effort-level': 5,
    'missing-schema': 6,
    'no-deny-rules': 7,
    'no-allow-rules': 8,
    'many-additional-dirs': 9,
    'automode-not-object': 10,
    'automode-unknown-subkey': 11,
    'automode-subkey-not-string-array': 12,
    'automode-in-shared-settings': 13,
    'hooks-as-array': 14,
  },

  // ── HKV: hook-validator (source order) ──────────────────────────────────
  HKV: {
    'invalid-json': 1,
    'hooks-not-object': 2,
    'unknown-event': 3,
    'handlers-not-array': 4,
    'matcher-not-string': 5,
    'missing-hooks-array': 6,
    'invalid-handler-type': 7,
    'script-not-found': 8,
    'verbose-output': 9,
    'unfiltered-additional-context': 10,
    'timeout-not-number': 11,
    'timeout-out-of-range': 12,
  },

  // ── RUL: rules-validator (source order) ─────────────────────────────────
  RUL: {
    'no-frontmatter': 1,
    'globs-instead-of-paths': 2,
    'pattern-matches-nothing': 3,
    'nearly-empty': 4,
    'large-unscoped': 5,
    'large-scoped-lost-after-compaction': 6,
    'not-markdown': 7,
  },

  // ── MCP: mcp-config-validator (source order) ────────────────────────────
  MCP: {
    'invalid-json': 1,
    'unknown-server-type': 2,
    'sse-transport': 3,
    'unreferenced-env-var': 4,
    'unknown-server-field': 5,
  },

  // ── IMP: import-resolver (source order) ─────────────────────────────────
  IMP: {
    'tilde-path': 1,
    'broken-link': 2,
    'circular-reference': 3,
    'deep-chain': 4,
  },

  // ── CNF: conflict-detector ──────────────────────────────────────────────
  // `permission-allow-deny` covers both arms (allow-in-A/deny-in-B and reverse).
  CNF: {
    'settings-key-conflict': 1,
    'permission-allow-deny': 2,
    'duplicate-hook': 3,
  },

  // ── DIS: disabled-in-schema-scanner (source order) ──────────────────────
  DIS: {
    'deny-and-allow': 1,
    'ineffective-allow-wildcard': 2,
    'forbidden-param-deny': 3,
    'forbidden-param-allow': 4,
  },

  // ── CPS: cache-prefix-scanner (CPS-001 documented) ──────────────────────
  CPS: {
    'volatile-in-prefix': 1,
    'volatile-in-import': 2,
  },

  // ── COL: collision-scanner (source order) ───────────────────────────────
  COL: {
    'skill-user-vs-plugin': 1,
    'skill-multi-plugin': 2,
  },

  // ── AGT: agent-listing-scanner (both documented; source order matches) ──
  AGT: {
    'description-bloat': 1,
    'aggregate-listing-budget': 2,
  },

  // ── OST: output-style-scanner (all three documented) ────────────────────
  OST: {
    'strips-coding-instructions': 1,
    'plugin-forces-style': 2,
    'style-not-found': 3,
  },

  // ── OPT: optimization-lens-scanner (documented) ─────────────────────────
  OPT: {
    'procedure-should-be-skill': 1,
  },

  // ── SKL: skill-listing-scanner (all three documented) ───────────────────
  // `aggregate-listing-budget` has two call sites: the conservative 200k anchor
  // and the calibrated `--context-window` variant. One check, one code.
  SKL: {
    'description-over-cap': 1,
    'aggregate-listing-budget': 2,
    'oversized-body': 3,
  },

  // ── TOK: token-hotspots ─────────────────────────────────────────────────
  // 1/2/3/5/6 are documented (README + commands/tokens.md). `mcp-schema-deferral`
  // is documented as 006 although it is the 8th call site in source order, so
  // `cascade-over-budget` and `stale-plugin-cache` take the free 7 and 8.
  TOK: {
    'volatile-top': 1,
    'redundant-permissions': 2,
    'deep-import-chain': 3,
    'bloated-skill-description': 4,
    'mcp-schema-budget': 5,
    'mcp-schema-deferral': 6,
    'cascade-over-budget': 7,
    'stale-plugin-cache': 8,
  },

  // ── PLH: plugin-health-scanner ──────────────────────────────────────────
  // 15 and 16 are documented (README v5.4.0 entry) but sit at source positions
  // 3 and 4; the remaining checks take {1…14, 17, 18, 19} in source order.
  PLH: {
    'invalid-plugin-json': 1,
    'missing-required-field': 2,
    'missing-plugin-json': 3,
    'claude-md-missing-section': 4,
    'missing-claude-md': 5,
    'command-missing-frontmatter': 6,
    'command-missing-field': 7,
    'agent-missing-frontmatter': 8,
    'agent-missing-field': 9,
    'agent-ignored-key': 10,
    'hooks-json-invalid-structure': 11,
    'hooks-json-array': 12,
    'hooks-json-invalid': 13,
    'unknown-plugin-file': 14,
    'plugin-json-shadows-default': 15,
    'skills-array-entry': 16,
    'no-plugins-found': 17,
    'command-name-collision': 18,
    'namespace-collision': 19,
  },

  // ── GAP: feature-gap-scanner ────────────────────────────────────────────
  // Keys are GAP_CHECKS[].id (already stable). Dimensions 1–24 in table order,
  // then the three conditional levers, which the scanner emits after the loop.
  GAP: {
    t1_1: 1,
    t1_2: 2,
    t1_3: 3,
    t1_4: 4,
    t1_5: 5,
    t2_1: 6,
    t2_2: 7,
    t2_3: 8,
    t2_4: 9,
    t2_5: 10,
    t2_6: 11,
    t2_7: 12,
    t3_1: 13,
    t3_2: 14,
    t3_3: 15,
    t3_4: 16,
    t3_5: 17,
    t3_6: 18,
    t3_7: 19,
    t4_1: 20,
    t4_2: 21,
    t4_3: 22,
    t4_4: 23,
    t4_5: 24,
    'bundled-skills-lever': 25,
    'cli-over-mcp-lever': 26,
    'filter-hook-output-lever': 27,
  },
};

/**
 * Keys withdrawn from a scanner. Their numbers are never reissued, so a stale
 * suppression goes dead instead of silently naming a different check.
 * @type {Record<string, string[]>}
 */
export const RETIRED_CODES = {
  // D1 (4027cdc, 2026-08-09): "No autoMode classifier" — /doctor Check 8 covers
  // auto mode with usage-weighted judgement, so the nudge went. The number it
  // occupied under the old counter scheme is not reused.
  GAP: ['t3_8'],
};

/**
 * Resolve a check key to its published number.
 * Throws rather than falling back: a fallback would let a half-converted scanner
 * ship IDs that look valid, which is the silent-degradation class this registry
 * exists to remove.
 * @param {string} scanner - scanner prefix, e.g. 'GAP'
 * @param {string} code - check key, e.g. 't3_7'
 * @returns {number}
 */
export function codeNumber(scanner, code) {
  const table = FINDING_CODES[scanner];
  if (!table) {
    throw new Error(`finding(): unknown scanner "${scanner}" — add it to FINDING_CODES`);
  }
  if (code === undefined || code === null || code === '') {
    throw new Error(`finding(): missing "code" for scanner ${scanner} — every finding must name its check`);
  }
  if (!Object.prototype.hasOwnProperty.call(table, code)) {
    const retired = (RETIRED_CODES[scanner] || []).includes(code);
    throw new Error(
      retired
        ? `finding(): check "${code}" is RETIRED for ${scanner} — retired numbers are never reissued`
        : `finding(): undeclared check "${code}" for ${scanner} — add it to FINDING_CODES with the next free number`
    );
  }
  return table[code];
}

/**
 * Render a finding ID from a check key.
 * @param {string} scanner
 * @param {string} code
 * @returns {string} e.g. 'CA-GAP-019'
 */
export function findingId(scanner, code) {
  return `CA-${scanner}-${String(codeNumber(scanner, code)).padStart(3, '0')}`;
}

/**
 * Every declared ID, as a flat set — used to validate suppression patterns so a
 * stale pin is reported instead of silently matching nothing.
 * @returns {Set<string>}
 */
export function allFindingIds() {
  const ids = new Set();
  for (const [scanner, table] of Object.entries(FINDING_CODES)) {
    for (const n of Object.values(table)) {
      ids.add(`CA-${scanner}-${String(n).padStart(3, '0')}`);
    }
  }
  return ids;
}

/**
 * Scanner prefixes the registry knows about.
 * @returns {string[]}
 */
export function knownScanners() {
  return Object.keys(FINDING_CODES);
}