// tools/registry-render.mjs
// Pure script — рендерит секции реестра в Markdown auto-region.
// Запуск: node tools/registry-render.mjs [--check]
// --check режим: возвращает exit 1 если rendered ≠ файлу (lefthook job).

import { readFileSync, writeFileSync } from 'fs';
import { join, dirname, resolve } from 'path';
import { fileURLToPath } from 'url';
import { loadRegistry } from './registry-load.mjs';

const __dirname = dirname(fileURLToPath(import.meta.url));
const REPO_ROOT = join(__dirname, '..');

const REGIONS = [
  {
    file: join(REPO_ROOT, 'docs', 'Tooling_v8_3.md'),
    marker: 'tooling-registry-summary',
    renderer: renderToolingSummary,
  },
  {
    file: join(REPO_ROOT, 'docs', 'routing-off-phase.md'),
    marker: 'routing-table',
    renderer: renderRoutingTable,
  },
];

function renderToolingSummary(registry) {
  const lines = ['<!-- This block is auto-generated from docs/registry/nodes.yaml. Do not edit by hand. -->', ''];
  lines.push(`| ID | Узел | Категория | Статус |`);
  lines.push(`|---|---|---|---|`);
  for (const node of registry.nodes) {
    lines.push(`| ${node.id} | ${node.name} | ${node.category} | ${node.status} |`);
  }
  lines.push('');
  return lines.join('\n');
}

function renderRoutingTable(registry) {
  const lines = ['<!-- This block is auto-generated from docs/registry/nodes.yaml. Do not edit by hand. -->', ''];
  const byClass = new Map();
  for (const node of registry.nodes) {
    if (node.status !== 'active') continue;
    for (const t of node.triggers) {
      if (!t.classification) continue;
      if (!byClass.has(t.classification)) byClass.set(t.classification, []);
      byClass.get(t.classification).push({ node, weight: t.weight ?? 1.0 });
    }
  }
  lines.push(`| Классификация | Рекомендуемый узел | Вес |`);
  lines.push(`|---|---|---|`);
  for (const [cls, entries] of [...byClass.entries()].sort()) {
    entries.sort((a, b) => b.weight - a.weight);
    for (const e of entries) {
      lines.push(`| \`${cls}\` | ${e.node.id} ${e.node.name} | ${e.weight} |`);
    }
  }
  lines.push('');
  return lines.join('\n');
}

export function replaceRegion(content, marker, rendered) {
  const start = `<!-- auto:${marker}:begin -->`;
  const end = `<!-- auto:${marker}:end -->`;
  const startIdx = content.indexOf(start);
  const endIdx = content.indexOf(end);
  if (startIdx === -1 || endIdx === -1) {
    throw new Error(`Markers <!-- auto:${marker}:begin/end --> not found`);
  }
  const before = content.slice(0, startIdx + start.length);
  const after = content.slice(endIdx);
  return `${before}\n${rendered}\n${after}`;
}

export function renderAll({ check = false } = {}) {
  const registry = loadRegistry();
  const results = [];
  for (const region of REGIONS) {
    const current = readFileSync(region.file, 'utf-8');
    const rendered = region.renderer(registry);
    const next = replaceRegion(current, region.marker, rendered);
    const drift = current !== next;
    if (check && drift) {
      results.push({ file: region.file, drift: true });
      continue;
    }
    if (!check && drift) {
      writeFileSync(region.file, next, 'utf-8');
    }
    results.push({ file: region.file, drift });
  }
  return results;
}

// Точка входа CLI
// Используем fileURLToPath + resolve для совместимости с кириллическими путями (Windows quirk)
const __filename = fileURLToPath(import.meta.url);
if (process.argv[1] && resolve(process.argv[1]) === __filename) {
  const check = process.argv.includes('--check');
  const results = renderAll({ check });
  for (const r of results) {
    console.log(`${r.drift ? '⚠️ drift' : '✅ ok  '} ${r.file}`);
  }
  if (check && results.some(r => r.drift)) {
    console.error('\nDrift detected. Run `node tools/registry-render.mjs` to regenerate.');
    process.exit(1);
  }
}