#!/usr/bin/env node

/**
 * optimize-lens CLI — feeds the v5.7 optimization lens (CA-OPT) `/config-audit
 * optimize` command. It produces the two halves of the hybrid motor as one JSON
 * payload:
 *
 *   1. `deterministic` — the OPT scanner's high-precision findings (CA-OPT-001:
 *      a long numbered procedure in CLAUDE.md → skill). Already part of the
 *      orchestrated audit; surfaced here so /optimize is a complete view.
 *   2. `candidates` — recall-oriented prose-judgment candidates from the
 *      lens-prefilter (lifecycle → hook, unscoped path-specific → rule, "never"
 *      → permission), each stamped with the CONFIRMED register entry it might fit
 *      (claim / recommendation / source / severity). The opus
 *      optimization-lens-agent is the precision gate over these.
 *
 * Only CONFIRMED register entries are attached (Verifiseringsplikt); a candidate
 * whose register rule is missing or unconfirmed is dropped, so the agent never
 * sees an unverifiable recommendation.
 *
 * Usage:
 *   node optimize-lens-cli.mjs [path] [--output-file <path>] [--global]
 *
 * Exit codes: 0=ok, 3=unrecoverable error. Zero external dependencies.
 */

import { resolve } from 'node:path';
import { writeFile, readFile, stat } from 'node:fs/promises';
import { discoverConfigFiles } from './lib/file-discovery.mjs';
import { resetCounter } from './lib/output.mjs';
import { parseFrontmatter } from './lib/yaml-parser.mjs';
import { loadRegister, getEntry } from './lib/best-practices-register.mjs';
import { prefilterClaudeMd, LENS_DETECTORS } from './lib/lens-prefilter.mjs';
import { scan as optScan } from './optimization-lens-scanner.mjs';

/** Confirmed register entry for `id`, or null. */
function confirmedEntry(register, id) {
  const e = getEntry(register, id);
  return e && e.confidence === 'confirmed' ? e : null;
}

async function main() {
  const args = process.argv.slice(2);
  let targetPath = '.';
  let outputFile = null;
  let includeGlobal = false;

  for (let i = 0; i < args.length; i++) {
    if (args[i] === '--global') includeGlobal = true;
    else if (args[i] === '--output-file' && args[i + 1]) outputFile = args[++i];
    else if (!args[i].startsWith('-')) targetPath = args[i];
  }

  const absPath = resolve(targetPath);
  try {
    const s = await stat(absPath);
    if (!s.isDirectory()) {
      process.stderr.write(`Error: ${absPath} is not a directory\n`);
      process.exit(3);
    }
  } catch {
    process.stderr.write(`Error: path does not exist: ${absPath}\n`);
    process.exit(3);
  }

  // Load the register once; tolerate its absence (deterministic half still runs).
  let register = null;
  try {
    register = loadRegister();
  } catch {
    register = null;
  }

  resetCounter();
  const discovery = await discoverConfigFiles(absPath, { includeGlobal });

  // ── Deterministic half: the OPT scanner (CA-OPT-001) ──
  const opt = await optScan(absPath, discovery);

  // ── Recall half: prose-judgment candidates from the pre-filter ──
  const claudeMdFiles = (discovery.files || []).filter((f) => f.type === 'claude-md');
  const candidates = [];
  for (const file of claudeMdFiles) {
    let content;
    try {
      content = await readFile(file.absPath, 'utf-8');
    } catch {
      continue;
    }
    const parsed = parseFrontmatter(content);
    const body = parsed.body || content;
    const bodyStartLine = parsed.bodyStartLine || 1;
    for (const cand of prefilterClaudeMd(body)) {
      const entry = register ? confirmedEntry(register, cand.registerId) : null;
      if (!entry) continue; // never surface an unverifiable recommendation
      candidates.push({
        file: file.relPath || file.absPath,
        line: bodyStartLine - 1 + cand.line,
        lensCheck: cand.lensCheck,
        mechanism: cand.mechanism,
        signalText: cand.text,
        register: {
          id: entry.id,
          claim: entry.claim,
          recommendation: entry.recommendation || null,
          severity: entry.severity || 'low',
          source: entry.source,
        },
      });
    }
  }

  // The CONFIRMED prose-judgment entries, so the agent has full provenance even
  // for a detector class that produced no candidates this run.
  const registerEntries = register
    ? LENS_DETECTORS.map((d) => confirmedEntry(register, d.registerId))
        .filter(Boolean)
        .map((e) => ({
          id: e.id,
          lensCheck: e.lensCheck,
          claim: e.claim,
          recommendation: e.recommendation || null,
          mechanism: e.mechanism || null,
          severity: e.severity || 'low',
          source: e.source,
        }))
    : [];

  const payload = {
    status: 'ok',
    target: absPath,
    deterministic: opt.findings || [],
    candidates,
    register: registerEntries,
    counts: {
      deterministic: (opt.findings || []).length,
      candidates: candidates.length,
      byLensCheck: candidates.reduce((acc, c) => {
        acc[c.lensCheck] = (acc[c.lensCheck] || 0) + 1;
        return acc;
      }, {}),
    },
  };

  const json = JSON.stringify(payload, null, 2);
  if (outputFile) {
    await writeFile(outputFile, json, 'utf-8');
  }
  if (!outputFile) {
    process.stdout.write(json + '\n');
  }
}

const isDirectRun = process.argv[1] && resolve(process.argv[1]) === resolve(new URL(import.meta.url).pathname);
if (isDirectRun) {
  main().catch((err) => {
    process.stderr.write(`Fatal: ${err.message}\n`);
    process.exit(3);
  });
}