#!/usr/bin/env node
// Fast, isolated unit test for student-csv.js — no Postgres, no HTTP. No framework, matching
// project convention (see platform/lab-router/test/run.js).

const assert = require('assert');
const { parseStudentCsv } = require('../src/student-csv');

function main() {
  {
    const r = parseStudentCsv('display_name,email,login_identifier,cohort_id\nAlice,alice@example.com,,root-fall\nBob,,bob01,root-fall');
    assert.equal(r.errors.length, 0);
    assert.equal(r.rows.length, 2);
    assert.equal(r.rows[0].email, 'alice@example.com');
    assert.equal(r.rows[1].login_identifier, 'bob01');
    console.log('ok — valid file parses');
  }
  {
    const r = parseStudentCsv('email\na@b.com');
    assert.ok(r.errors.length > 0);
    console.log('ok — missing display_name column rejected');
  }
  {
    const r = parseStudentCsv('display_name,password\nAlice,hunter2');
    assert.ok(r.errors.some((e) => e.message.includes('password')));
    console.log('ok — password column never accepted from a file');
  }
  {
    const r = parseStudentCsv('display_name,email\nAlice,a@b.com,extra');
    assert.ok(r.errors.length > 0);
    assert.equal(r.rows.length, 0);
    console.log('ok — a malformed row rejects the whole file (transactional, no partial import)');
  }
  {
    const r = parseStudentCsv('display_name,email\nAlice,a@b.com\nBob,a@b.com');
    assert.ok(r.errors.some((e) => e.message.includes('duplicate email')));
    console.log('ok — duplicate email within one file rejected');
  }
  {
    const r = parseStudentCsv('display_name,email\nAlice,not-an-email');
    assert.ok(r.errors.some((e) => e.message.includes('invalid email')));
    console.log('ok — invalid email format rejected');
  }
  console.log('\nAll student-csv unit tests passed.');
}

main();