#!/usr/bin/env node
/**
 * Routing-gate method-direction detector (brain governance, observer
 * factor-analysis spec §5.1). Pure — given a user-prompt text and a list of
 * known node names, decides whether the user *dictated* a specific method.
 * Conservative-broad: a directive verb within a 40-char window before a node
 * name, or a /slash-command form.
 *
 * Security Guidance #40: pure string ops — no exec/execSync.
 */
import { readFileSync, existsSync } from 'fs';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';

/** Repo root = parent of the tools/ directory where this module lives. */
const REPO_ROOT = dirname(dirname(fileURLToPath(import.meta.url)));

const KNOWN_NODES_PATH = 'tools/observer-known-nodes.txt';

const DIRECTIVE_VERBS = [
  'запусти', 'запускай', 'используй', 'вызови', 'вызывай', 'прогони',
  'применяй', 'применить', 'через', 'run', 'use', 'invoke', 'via',
];

/** Load the directable node names from the data file (# comments / blanks skipped). */
export function loadKnownNodes(path = KNOWN_NODES_PATH) {
  const absPath = resolve(REPO_ROOT, path);
  if (!existsSync(absPath)) return [];
  const out = [];
  for (const line of readFileSync(absPath, 'utf-8').split('\n')) {
    const t = line.trim();
    if (!t || t.startsWith('#')) continue;
    out.push(t);
  }
  return out;
}

/**
 * Снять ТОЛЬКО PASTED-контекст: fenced-блоки и markdown-blockquote-строки.
 * НАМЕРЕННО НЕ трогает inline-backticks/кавычки/guillemets — в отличие от
 * stripQuotedContext (tools/enforce-rationalization-audit.mjs), у которого
 * ПРОТИВОПОЛОЖНОЕ безопасное направление (FN-safe). Здесь гейт routingGate
 * FP-safe: inline-форма `/x` должна оставаться директивой (over-detection
 * дешевле тихой потери governance-сигнала; sharp-edges SE-1).
 */
export function stripPastedContext(text) {
  if (typeof text !== 'string') return '';
  let s = text;
  s = s.replace(/```[\s\S]*?```/g, ' ');            // fenced blocks
  s = s.replace(/^[ \t]*(?:>|&gt;).*$/gm, ' ');      // markdown blockquote lines
  return s;
}

/**
 * @returns {{directed: boolean, node: string|null}}
 */
export function detectMethodDirected(promptText, knownNodes) {
  const text = stripPastedContext(String(promptText || '')).toLowerCase();
  for (const node of knownNodes || []) {
    const n = String(node).toLowerCase();
    if (!n) continue;
    if (text.includes('/' + n)) return { directed: true, node };
    const idx = text.indexOf(n);
    if (idx === -1) continue;
    const before = text.slice(Math.max(0, idx - 40), idx);
    if (DIRECTIVE_VERBS.some((v) => before.includes(v))) return { directed: true, node };
  }
  return { directed: false, node: null };
}

if (process.argv[1] && process.argv[1].replace(/\\/g, '/').endsWith('/observer-routing-detector.mjs')) {
  const det = detectMethodDirected(process.argv.slice(2).join(' '), loadKnownNodes());
  console.log(JSON.stringify(det));
  process.exit(0);
}
