// innboks-convert.test.mjs
// Step 11 (SC format): konverterings-adaptere txt/md/docx/eml/pdf -> markdown.
// Verifiserer:
//   - .txt/.md -> markdown alltid (zero-dep-sti, node:-builtins)
//   - eksterne lenker NOEYTRALISERES ved konvertering (inline/ref-def/autolink/
//     HTML-anker/bilde): lenketeksten bevares, scheme-maalet droppes -- slik at
//     strict-gaten (B3/F2) aldri felles av legitim konvertert output
//   - .docx/.eml -> heading-STRUKTUR bevart ('# '-linjer, atx -- IKKE byte-snapshot);
//     .pdf -> tekst ekstrahert (flat, dokumentert v1-caveat M5)
//   - convert-twice-identical: samme binaerfil konvertert 2x gir byte-identisk
//     markdown (konverterings-determinismen idempotensen hviler paa)
//   - ukjent extension (.xlsx) -> null + norsk notice, INGEN throw
// Binaer-adapterne kjoerer conditional { skip: !engines } (plugin kan vaere
// installert uten node_modules -- npm-deps er dokumentert prerequisite).
// Moenster: node:test conditional skip; fixtures under tests/fixtures/inbox-sample/.

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, writeFileSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

import { convert } from '../lib/convert/index.mjs';

const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..');
const SAMPLE = join(ROOT, 'tests', 'fixtures', 'inbox-sample');

// Er binaer-konverterings-motorene installert? (npm-deps = dokumentert prerequisite.)
async function enginesAvailable() {
  try {
    await import('mammoth');
    await import('turndown');
    await import('postal-mime');
    await import('unpdf');
    return true;
  } catch {
    return false;
  }
}
const engines = await enginesAvailable();

// Temp-katalog for haandlagde input-filer. Ryddes alltid.
function withTmp(fn) {
  const dir = mkdtempSync(join(tmpdir(), 'innboks-convert-'));
  try {
    return fn(dir);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
}

test('.txt konverteres alltid (zero-dep): innhold bevart som markdown', async () => {
  const md = await convert(join(SAMPLE, 'dok-a.txt'));
  assert.equal(typeof md, 'string');
  assert.ok(md.length > 0);
});

test('.md passthrough: markdown-struktur bevart', async () => {
  await withTmp(async (dir) => {
    const p = join(dir, 'notat.md');
    writeFileSync(p, '# Tittel\n\nAvsnitt.\n\n## Under\n\nMer.\n');
    const md = await convert(p);
    assert.match(md, /^# Tittel$/m);
    assert.match(md, /^## Under$/m);
  });
});

test('eksterne lenker noeytraliseres: inline/ref-def/autolink/HTML/bilde', async () => {
  await withTmp(async (dir) => {
    const p = join(dir, 'fiendtlig.txt');
    writeFileSync(
      p,
      '# Notat\n\n'
        + 'Se [rapporten](https://evil.example/exfil) og [vedlegget][r].\n\n'
        + '[r]: https://evil.example/ref\n\n'
        + '<https://evil.example/auto>\n\n'
        + '<a href="file:///etc/passwd">passord</a>\n\n'
        + '![skjermbilde](https://evil.example/pixel.png)\n\n'
        + 'Intern relasjon: [Notat](/dokumenter/notat.md) beholdes.\n',
    );
    const md = await convert(p);
    // Lenketekst bevart:
    assert.match(md, /rapporten/);
    assert.match(md, /vedlegget/);
    assert.match(md, /passord/);
    assert.match(md, /skjermbilde/);
    // Ingen lenke-FORM med eksterne maal igjen (inline, ref-def, autolink, HTML):
    assert.doesNotMatch(md, /\]\(https?:/);
    assert.doesNotMatch(md, /^\s{0,3}\[[^\]]+\]:/m);
    assert.doesNotMatch(md, /<https?:/);
    assert.doesNotMatch(md, /<a\s/i);
    assert.doesNotMatch(md, /!\[/);
    assert.doesNotMatch(md, /file:\/\//);
    // Trygg bundle-root-relativ .md-lenke beholdes (relasjons-formatet):
    assert.match(md, /\[Notat\]\(\/dokumenter\/notat\.md\)/);
  });
});

test('.docx -> markdown med atx-heading-struktur (ikke byte-snapshot)', { skip: !engines }, async () => {
  const md = await convert(join(SAMPLE, 'dok.docx'));
  assert.equal(typeof md, 'string');
  // M5/F4: {headingStyle:'atx'} er pinnet -> '#'-headings, aldri setext.
  assert.match(md, /^# /m);
  assert.match(md, /^## /m);
  assert.doesNotMatch(md, /^=+$/m);
});

test('.eml -> markdown: subject som heading + body-tekst (kun body, vedlegg = non-goal)', { skip: !engines }, async () => {
  const md = await convert(join(SAMPLE, 'dok.eml'));
  assert.match(md, /^# Statusoppdatering T2/m);
  assert.match(md, /Fremdrift paa maaltallene/);
});

test('.pdf -> tekst ekstrahert (flat markdown, isEvalSupported:false-sti)', { skip: !engines }, async () => {
  const md = await convert(join(SAMPLE, 'dok.pdf'));
  assert.equal(typeof md, 'string');
  assert.match(md, /Tildelingsbrev 2026/);
});

test('convert-twice-identical: docx og pdf gir byte-identisk markdown', { skip: !engines }, async () => {
  for (const f of ['dok.docx', 'dok.pdf']) {
    const first = await convert(join(SAMPLE, f));
    const second = await convert(join(SAMPLE, f));
    assert.equal(first, second, `ikke-deterministisk konvertering: ${f}`);
  }
});

test('ukjent extension (.xlsx) -> null + norsk notice, ingen throw', async () => {
  await withTmp(async (dir) => {
    const p = join(dir, 'regneark.xlsx');
    writeFileSync(p, 'ikke egentlig xlsx');
    const notices = [];
    const md = await convert(p, { onNotice: (msg) => notices.push(msg) });
    assert.equal(md, null);
    assert.equal(notices.length, 1);
    assert.match(notices[0], /hopper over/);
    assert.match(notices[0], /regneark\.xlsx/);
  });
});