#!/usr/bin/env node
/**
 * P2-1 Patch: Shadow Haiku Route Logging
 * Adds detailed route decision logging to route-interceptor-bundle.js
 * for offline comparison with haiku LLM routing.
 * Idempotent: sentinel [P2-1] SHADOW_HAIKU_v1
 */
'use strict';
const fs = require('fs');
const path = require('path');

const TARGET = path.resolve(__dirname, '..', '..', 'hooks', 'route-interceptor-bundle.js');
const SENTINEL = '[P2-1] SHADOW_HAIKU_v1';

if (!fs.existsSync(TARGET)) { process.stderr.write('[SKIP] route-interceptor-bundle.js not found\n'); process.exit(0); }

const src = fs.readFileSync(TARGET, 'utf8');
if (src.includes(SENTINEL)) { process.stderr.write('[SKIP] already patched (sentinel found)\n'); process.exit(0); }

fs.writeFileSync(TARGET + '.bak-p21.' + Date.now(), src);

const anchor = 'writeRouteState(traceId, prompt, intent, routing);';
const idx = src.indexOf(anchor);
if (idx === -1) { process.stderr.write('[FAIL] anchor not found\n'); process.exit(1); }

const code = [
  '',
  '      // ' + SENTINEL,
  '      try {',
  '        var _ffp = path.join(CLAUDE_ROOT, \'.bookworm-features.json\');',
  '        var _shOk = true;',
  '        try { if (fs.existsSync(_ffp)) { var _f = JSON.parse(fs.readFileSync(_ffp, \'utf8\')); if (_f.shadow_haiku_route === false) _shOk = false; } } catch {}',
  '        if (_shOk) {',
  '          var _shLog = path.join(CLAUDE_ROOT, \'debug\', \'shadow-route-log.jsonl\');',
  '          try { fs.mkdirSync(path.dirname(_shLog), { recursive: true }); } catch {}',
  '          var _shEntry = {',
  '            ts: new Date().toISOString(), tid: traceId,',
  '            ph: prompt.slice(0, 200), pl: prompt.length,',
  '            it: intent ? { i: intent.intents, c: intent.complexity } : null,',
  '            p: routing.primary, cf: routing.confidence,',
  '            t5: (routing.candidates || []).slice(0, 5).map(function(c) { return { n: c.name, c: c.confidence }; }),',
  '            d: routing.domain || null,',
  '            fr: (routing._firedRules || []).map(function(r) { return r.id || r.rule || \'\'; }).filter(Boolean).slice(0, 5),',
  '            ih: inherited, cs: routing._coldStartApplied || false,',
  '          };',
  '          fs.appendFileSync(_shLog, JSON.stringify(_shEntry) + \'\\n\');',
  '        }',
  '      } catch {}',
].join('\n');

const insertAt = idx + anchor.length;
const patched = src.slice(0, insertAt) + code + src.slice(insertAt);

const tmp = TARGET + '.tmp.' + process.pid;
fs.writeFileSync(tmp, patched, 'utf8');
fs.renameSync(tmp, TARGET);
process.stderr.write('[DONE] P2-1 shadow haiku logging added\n');