#!/usr/bin/env node
/* Restauración v4: extrae funciones de HEAD en ambos formatos (function X / window.X = function). */
const fs = require('fs');
const { execSync } = require('child_process');

const old = execSync('git show HEAD:pos/static/js/inventory.js', { maxBuffer: 20 * 1024 * 1024 }).toString();
let cur = fs.readFileSync('pos/static/js/inventory.js', 'utf8');

// Nombres realmente faltantes (referenciados por templates o expuestos), según auditoría:
const CANDIDATES = ['searchMeliCategories', 'handleMeliCatKeydown', 'onMeliShippingChange',
  'validateMeliPublish', 'executeMeliPublish', 'openMeliPublishModal', 'closeMeliPublishModal',
  'refreshMeliPublishPreview', 'selectMeliCategory', 'selectMeliCategoryIdx', 'highlightMeliCat',
  'loadCategoryAttributes', 'updateMeliTitleCount', 'handleMeliImageUpload', 'showTierDiscountModal',
  'closeTierDiscountModal', 'saveTierDiscounts', 'openInventoryFilters'];

function hasDef(src, name) {
  return new RegExp('\\n    function ' + name + '\\s*\\(').test(src) ||
         new RegExp('\\n    window\\.' + name + '\\s*=').test(src) ||
         new RegExp('\\n    (?:var|let|const) ' + name + '\\s*=').test(src);
}

// extrae desde el inicio de la definición hasta el próximo inicio de nivel 4
function extract(src, name) {
  const patterns = [
    '\n    function ' + name + '(',
    '\n    function ' + name + ' (',
    '\n    window.' + name + ' = function',
    '\n    window.' + name + ' = async function',
    '\n    var ' + name + ' = function',
  ];
  let start = -1;
  for (const p of patterns) { start = src.indexOf(p); if (start !== -1) break; }
  if (start === -1) return null;
  let end = src.length;
  const stops = [
    src.indexOf('\n    function ', start + 30),
    src.indexOf('\n    window.', start + 30),
    src.indexOf('\n    var ', start + 30),
    src.indexOf('\n    // ====', start + 30),
  ].filter(i => i !== -1);
  if (stops.length) end = Math.min(...stops);
  return src.slice(start + 1, end);
}

const blocks = [];
const missingNoHead = [];
for (const name of CANDIDATES) {
  if (hasDef(cur, name)) continue;           // ya existe
  const b = extract(old, name);
  if (b) blocks.push(b.trimEnd());
  else missingNoHead.push(name);
}

console.log('restaurables desde HEAD:', blocks.length);
console.log('no halladas en HEAD:', missingNoHead);

if (blocks.length) {
  const anchor = '\n    // =====================================================================\n    //  EXPOSE GLOBALS (for onclick handlers in HTML)';
  const idx = cur.indexOf(anchor);
  if (idx === -1) { console.log('ERROR anchor'); process.exit(1); }
  cur = cur.slice(0, idx) + '\n    // ==== RESTAURADAS v4 (MELI + descuentos) ====\n\n' + blocks.join('\n\n') + '\n' + cur.slice(idx);
}
fs.writeFileSync('pos/static/js/inventory.js', cur);
console.log('escrito');