#!/usr/bin/env node
/* Restauración v3: TODAS las funciones/globales que el parche borró de inventory.js
   (comparando HEAD vs actual por referencias de templates + exposiciones window). */
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');

// 1. Identificadores referenciados por templates (onclick/onchange/oninput/onkeydown)
const tpl = fs.readFileSync('pos/templates/inventory.html', 'utf8');
const handlers = new Set();
const reH = /on(?:click|change|input|keydown|keyup|blur|focus)="([^"]+)"/g;
let m;
while ((m = reH.exec(tpl))) {
  const body = m[1];
  const reId = /([A-Za-z_$][\w$]*)\s*\(/g;
  let mm;
  while ((mm = reId.exec(body))) {
    const fn = mm[1];
    if (!['if', 'event', 'this', 'return', 'parseInt', 'parseFloat', 'String', 'Number', 'confirm', 'alert'].includes(fn)) {
      handlers.add(fn);
    }
  }
}

// 2. window.X = X sin definición en el archivo actual
const exposeRe = /window\.([A-Za-z_$][\w$]*)\s*=\s*\1\b/g;
const exposed = new Set();
while ((m = exposeRe.exec(cur))) exposed.add(m[1]);

// 3. Referencias directas dentro del JS (llamadas sin definición)
const calledMissing = [];
for (const name of handlers) {
  const defined = new RegExp('function\\s+' + name + '\\b').test(cur) ||
                  new RegExp('\\b' + name + '\\s*=\\s*function').test(cur) ||
                  cur.includes('window.' + name + ' ');
  if (!defined) calledMissing.push(name);
}

console.log('handlers de template SIN definición:', calledMissing);
console.log('exposiciones window sin función:', [...exposed].filter(n => !new RegExp('function\\s+' + n + '\\b').test(cur) && !new RegExp('\\b' + n + '\\s*=\\s*function').test(cur)));

// 4. extraer de HEAD cada función faltante (por marcadores de 4 espacios)
function extractFrom(src, name) {
  const start = src.indexOf('\n    function ' + name + '(');
  if (start === -1) return null;
  let end = src.length;
  const nf = src.indexOf('\n    function ', start + 30);
  const nm = src.indexOf('\n    // =====================================================================', start + 30);
  if (nf !== -1) end = Math.min(end, nf);
  if (nm !== -1) end = Math.min(end, nm);
  return src.slice(start + 1, end);
}

const need = new Set([...calledMissing]);
for (const n of exposed) {
  if (!new RegExp('function\\s+' + n + '\\b').test(cur)) need.add(n);
}

const blocks = [];
for (const name of need) {
  const b = extractFrom(old, name);
  if (b) blocks.push(b.trimEnd());
  else console.log('  (no está en HEAD: ' + name + ')');
}

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 no encontrado'); process.exit(1); }
  cur = cur.slice(0, idx) + '\n    // ==== RESTAURADAS v3 ====\n\n' + blocks.join('\n\n') + '\n' + cur.slice(idx);
  fs.writeFileSync('pos/static/js/inventory.js', cur);
  console.log('restauradas ' + blocks.length + ' funciones');
}