/** Column-mapping checks for spreadsheet import. */
import { readCsv, mapRows } from '../src/codec/sheet.mjs';

let fails = 0;
function check(label, got, want) {
  const ok = JSON.stringify(got) === JSON.stringify(want);
  if (!ok) { fails++; console.log(`  ❌ ${label}\n     got  ${JSON.stringify(got)}\n     want ${JSON.stringify(want)}`); }
  else console.log(`  ✅ ${label}`);
}

// The template shipped with these buses: a "Line" row number AND a "Line Name".
// The name must win over the number — this was a real bug.
check('shipped template layout',
  mapRows(readCsv(
    'Company Name:,Yutong Coaches\n' +
    '\n' +
    'Line,Line Name,Description,Content (Display)\n' +
    '1,SCHOOL BUS,morning,SCHOOL BUS\n' +
    '2,CARMEL,college run,CARMEL COLLEGE\n'
  )),
  { company: 'Yutong Coaches', destinations: [
    { name: 'SCHOOL BUS', text: 'SCHOOL BUS' },
    { name: 'CARMEL', text: 'CARMEL COLLEGE' },
  ] });

check('only a number column plus content — do not show the driver a bare number',
  mapRows(readCsv('Line,Content (Display)\n1,DEPOT\n2,RAIL BUS\n')).destinations,
  [{ name: 'DEPOT', text: 'DEPOT' }, { name: 'RAIL BUS', text: 'RAIL BUS' }]);

check('no header at all',
  mapRows(readCsv('SCHOOL BUS\nCHARTER\n')).destinations,
  [{ name: 'SCHOOL BUS', text: 'SCHOOL BUS' }, { name: 'CHARTER', text: 'CHARTER' }]);

check('destination column naming',
  mapRows(readCsv('Name,Destination\nAIRPORT,AIRPORT SHUTTLE VIA CITY\n')).destinations,
  [{ name: 'AIRPORT', text: 'AIRPORT SHUTTLE VIA CITY' }]);

check('blank rows and stray whitespace ignored',
  mapRows(readCsv('Line Name,Content\n\n  DEPOT , DEPOT VIA YARD \n\n')).destinations,
  [{ name: 'DEPOT', text: 'DEPOT VIA YARD' }]);

check('controller name is capped at the 16 characters the record holds',
  mapRows(readCsv('Line Name,Content\nA VERY LONG DESTINATION NAME,SOMETHING\n')).destinations[0].name,
  'A VERY LONG DEST');

check('quoted fields with commas',
  mapRows(readCsv('Line Name,Content\n"CITY, VIA MALL","CITY, VIA MALL"\n')).destinations,
  [{ name: 'CITY, VIA MALL', text: 'CITY, VIA MALL' }]);

check('unrecognised headers are still headers, and Route beats the row number',
  mapRows(readCsv('No.,Route,Notes\n1,SCHOOL BUS,am\n2,CARMEL COLLEGE,pm\n')).destinations,
  [{ name: 'SCHOOL BUS', text: 'SCHOOL BUS' }, { name: 'CARMEL COLLEGE', text: 'CARMEL COLLEGE' }]);

check('no recognisable columns at all — longest words win, name mirrors the sign',
  mapRows(readCsv('A,B,C\n1,x,AIRPORT SHUTTLE VIA CITY\n2,y,DEPOT RUN\n')).destinations,
  [{ name: 'AIRPORT SHUTTLE', text: 'AIRPORT SHUTTLE VIA CITY' }, { name: 'DEPOT RUN', text: 'DEPOT RUN' }]);

console.log(fails === 0 ? '\n✅ spreadsheet mapping correct' : `\n❌ ${fails} failed`);
process.exit(fails ? 1 : 0);