// api#326: реальный handoff codec, включая сохранённые legacy records.
const assert = require('node:assert/strict');
const fs = require('node:fs');
const vm = require('node:vm');
const source = fs.readFileSync('/app/components/utm-handoff.php','utf8').replace(/\r\n/g,'\n').split("<<<'JS'\n")[1].split('\nJS;')[0];
const context = {window:{},URLSearchParams,Uint8Array,crypto:require('node:crypto').webcrypto};
vm.runInNewContext(source,context);
const handoff=context.window.ZoomzillaUtmHandoff;
const defaults={indpic:'1',theme:'1',degr:'1',reg:'2',banch:'2',tp:'1',cons:'2',focus:'1',part:'1'};
const selected={indpic:'2',theme:'2',degr:'2',reg:'1',banch:'1',tp:'2',cons:'3',focus:'2',part:'2'};
const foreign='utm_source=abcd9same&subid=%D1%82%D0%B5%D1%81%D1%82+%2B+%26&id=42&stage=keep';
for(const meta of [
 {redirectUtm:foreign,utmDigits:selected},
 {redirectUtm:foreign,utmDigits:{...selected,banch:undefined,chob:'1'}},
 {redirectUtm:foreign+'&indpic=abcd2&theme=абвг2&degr=abcd2&reg=abcd1&chob=abcd1&tp=abcd2&cons=abcd3&focus=abcd2&part=abcd2'},
 {redirectUtm:foreign+'&indpic=2&theme=light&degr=2&registration=before&bchoice=b&tp=2&cons=3&focus=center&part=2&chb=a'},
 {redirectUtm:foreign+'&indpic=abcd2&theme=абвг2&degr=abcd2&reg=abcd1&banch=abcd1&tp=abcd2&cons=abcd3&focus=abcd2&part=abcd2'}
]){
 const before=JSON.stringify(meta);
 const first=new URLSearchParams(handoff.query(meta,defaults));
 const second=new URLSearchParams(handoff.query(meta,defaults));
 for(const [key,digit] of Object.entries(selected)){
  assert.match(first.get(key),/^[A-Za-z0-9]{10}$/);
  assert.equal(first.get(key)[4],digit);
  assert.equal(second.get(key)[4],digit);
  assert.notEqual(first.get(key),second.get(key));
 }
 for(const query of [first,second]){
  assert.equal(query.get('utm_source'),'abcd9same');
  assert.equal(query.get('subid'),'тест + &');
  assert.equal(query.get('id'),'42'); assert.equal(query.get('stage'),'keep');
  for(const legacy of ['registration','bchoice','chb','chob'])assert.equal(query.has(legacy),false);
 }
 assert.equal(JSON.stringify(meta),before);
}
const typeIn=new URLSearchParams(handoff.query({redirectUtm:'',utmDigits:defaults},defaults));
for(const [key,digit]of Object.entries(defaults))assert.equal(typeIn.get(key)[4],digit);
console.log('OK: all9 fresh noise/repeated handoff, legacy recovery, type-in, foreign/technical values');
for (const part of ['abcd9','abcd0','bad']) {
 const query = new URLSearchParams(handoff.query({redirectUtm:'part='+part},defaults));
 assert.equal(query.get('part')[4],'1');
}
assert.equal(new URLSearchParams(handoff.query({utmDigits:{...defaults,part:'9'}},defaults)).get('part')[4],'1');