const { test } = require('node:test');
const assert = require('node:assert');
global.PDFLib = require('pdf-lib');
const { buildStudyLoadPdf } = require('../pdf.js');

const sampleData = {
  header: {
    fullName: 'ADRIAN ALFRED CHIONG BONPIN',
    studentId: '22103625',
    program: 'BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY',
    yearLevel: '4',
    semester: '1ST Semester 2026',
    dateEnrolled: '8/5/2024',
    dateRange: 'AUGUST - JANUARY'
  },
  courses: [
    { group: '7', courseCode: 'CIS 2101', description: 'DATA STRUCTURES AND ALGORITHMS', units: '3.00', teacher: 'CHRISTIAN MADERAZO', schedule: 'M,W 03:00 PM - 05:30 PM LB443TC', status: 'REGULAR' },
    { group: '2', courseCode: 'IT 3103N', description: 'SYSTEMS INTEGRATION AND ARCHITECTURE', units: '3.00', teacher: 'KHENT DELA PAZ', schedule: 'T,Th 01:30 PM - 03:00 PM DCISMVR3TC', status: 'REGULAR' }
  ],
  totalUnits: '6.00'
};

test('buildStudyLoadPdf returns valid PDF bytes', async () => {
  const bytes = await buildStudyLoadPdf(sampleData);
  assert.ok(bytes instanceof Uint8Array);
  const head = Buffer.from(bytes.slice(0, 5)).toString('latin1');
  assert.strictEqual(head, '%PDF-');
  const doc = await PDFLib.PDFDocument.load(bytes);
  assert.strictEqual(doc.getPageCount(), 1);
});