// Source articles for AI generation are held whole in memory to be parsed, so
// the ceiling matters, and the declared type is chosen by whoever uploads.
const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');

const route = fs.readFileSync(path.join(__dirname, '..', 'src/routes/learningAI.js'), 'utf8');

test('the per-file ceiling is 10 MB, in one place', () => {
  assert.match(route, /var MAX_SOURCE_BYTES = 10 \* 1024 \* 1024;/);
  assert.match(route, /fileSize: MAX_SOURCE_BYTES/);
  assert.doesNotMatch(route, /100 \* 1024 \* 1024/, 'the old 100 MB ceiling is gone');
});

test('the type and the extension must both be allowed, not either', () => {
  // It was `mime OR extension`, so naming a file .pdf was enough on its own.
  assert.match(route, /ALLOWED_SOURCE_TYPES\.includes\(file\.mimetype\) && ALLOWED_SOURCE_EXTENSIONS\.test\(file\.originalname\)/);
  assert.doesNotMatch(route, /allowed\.includes\(file\.mimetype\) \|\| file\.originalname\.match/);
});

test('the bytes are sniffed once the buffer exists, before anything parses them', () => {
  // multer filters on headers alone, before any byte has arrived.
  assert.match(route, /function verifySources\(files\)/);
  assert.match(route, /fileType\.matches\(file\.mimetype, file\.buffer\)/);
  assert.match(route, /is not the file type it claims to be/);
  // And it runs ahead of extraction, not after.
  const call = route.indexOf('verifySources(req.files)');
  const extract = route.indexOf('await extractText(');
  assert.ok(call > -1 && call < extract, 'verification must precede extraction');
});

test('the size is re-checked on the buffer, not trusted from the header', () => {
  assert.match(route, /file\.size > MAX_SOURCE_BYTES/);
  assert.match(route, /is larger than 10 MB/);
});

test('what the screen promises matches what the server accepts', () => {
  const cms = fs.readFileSync(path.join(__dirname, '..', 'public/components/cms.html'), 'utf8');
  assert.match(cms, /max 10 MB each, up to 10 files/);
  assert.doesNotMatch(cms, /100 MB/);
});