const { test } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs/promises');
const path = require('node:path');
const MarkdownIt = require('markdown-it');

let modulePromise;

async function loadCitationModule() {
  if (!modulePromise) {
    modulePromise = fs.readFile(path.join(__dirname, '..', 'public', 'js', 'assistant', 'citations.js'), 'utf8')
      .then((source) => import('data:text/javascript;charset=utf-8,' + encodeURIComponent(source)));
  }
  return modulePromise;
}

const sources = [
  { title: 'Nelson Textbook of Pediatrics' },
  { title: 'Pediatric Asthma Guideline' },
  { resource: 'Emergency Medicine Review' }
];

test('renders citation clusters as links to matching source cards', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Give magnesium for severe exacerbation [1, 2].', sources);
  assert.match(html, /href="#assistant-source-1"/);
  assert.match(html, /href="#assistant-source-2"/);
  assert.match(html, /title="Source 1: Nelson Textbook of Pediatrics"/);
  assert.match(html, /data-source-number="1"/);
  assert.match(html, /data-source-number="2"/);
  assert.match(html, /<a class="assistant-cite"[^>]*>src<\/a> <a class="assistant-cite"[^>]*>src<\/a>/);
});

test('can render citation labels as numbers for PDF export', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Give magnesium for severe exacerbation [1, 2].', sources, { citationLabel: 'number' });
  assert.match(html, /<a class="assistant-cite"[^>]*>1<\/a> <a class="assistant-cite"[^>]*>2<\/a>/);
});

test('leaves unknown citation clusters untouched rather than guessing', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Dose statement [4].', sources);
  assert.match(html, /\[4\]/);
  assert.doesNotMatch(html, /assistant-source-4/);
});

test('does not merge separate citations across separate claims', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Use oxygen [1]. Give bronchodilator [2].', sources);
  assert.match(html, /oxygen <a class="assistant-cite"[^>]*data-source-number="1"[^>]*>src<\/a>/);
  assert.match(html, /bronchodilator <a class="assistant-cite"[^>]*data-source-number="2"[^>]*>src<\/a>/);
  assert.doesNotMatch(html, /data-source-number="1"[^>]*>src<\/a><a class="assistant-cite"[^>]*data-source-number="2"/);
});

test('sorts adjacent citation tokens into one safe Vancouver cluster', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Deteriorating course [1][4][2][3].', [
    { title: 'A' }, { title: 'B' }, { title: 'C' }, { title: 'D' }
  ]);
  assert.match(html, /data-source-number="1"[^>]*>src<\/a> <a class="assistant-cite"[^>]*data-source-number="2"[^>]*>src<\/a> <a class="assistant-cite"[^>]*data-source-number="3"[^>]*>src<\/a> <a class="assistant-cite"[^>]*data-source-number="4"[^>]*>src<\/a>/);
  assert.doesNotMatch(html, /\]<span|\]\[/);
});

test('repairs a clearly adjacent trailing citation missing its closing bracket', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Deteriorating course [1][4][2][3', [
    { title: 'A' }, { title: 'B' }, { title: 'C' }, { title: 'D' }
  ]);
  assert.match(html, /data-source-number="1"[^>]*>src<\/a> <a class="assistant-cite"[^>]*data-source-number="2"[^>]*>src<\/a> <a class="assistant-cite"[^>]*data-source-number="3"[^>]*>src<\/a> <a class="assistant-cite"[^>]*data-source-number="4"[^>]*>src<\/a>/);
});

test('does not normalize adjacent citations if any source number is unknown', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Unsupported claim [1][9].', sources);
  assert.match(html, /\[9\]/);
  assert.doesNotMatch(html, /assistant-source-9/);
});

test('escapes source titles inside citation link titles', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Unsafe title [1].', [{ title: 'Bad "Title" <script>' }]);
  assert.match(html, /title="Source 1: Bad &quot;Title&quot; &lt;script&gt;"/);
  assert.doesNotMatch(html, /<script>/);
});

test('does not strip sentences that mention available sources', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Pneumonia can cause parapneumonic effusion [1]. However, the available sources do not specifically identify adenovirus as a typical cause [2]. In summary, evidence is insufficient [3].', sources);
  assert.match(html, /available sources do not specifically identify adenovirus/);
  assert.match(html, /In summary, evidence is insufficient/);
});

test('normalizes inline markdown headings before rendering', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Intro ### Management\n- oxygen', sources);
  assert.match(html, /<h3>Management<\/h3>/);
  assert.match(html, /<li>oxygen<\/li>/);
});

test('normalizes old saved assistant answer formatting', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Comparison of Bronchiolitis and Asthma Management in Infants ### Bronchiolitis Management - Mainstay: Supportive care [1, 2]. - Medications: bronchodilators are not routine [2]. ### Key Differences | Aspect | Bronchiolitis | Asthma | |---|---|---| | Therapy | Supportive | SABA | --- References: [1] duplicate', sources);
  assert.match(html, /<h3>Bronchiolitis Management<\/h3>/);
  assert.match(html, /<li>Mainstay: Supportive care/);
  assert.match(html, /Key Differences/);
});

test('repairs smashed admission bullet list after citations', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Admission is indicated for: Apnoea [1, 2]- **Persistent oxygen saturation <90%** [1, 2]- **Severe respiratory distress** [1]', sources);
  assert.match(html, /<li><strong>Persistent oxygen saturation &lt;90%<\/strong>/);
  assert.match(html, /<li><strong>Severe respiratory distress<\/strong>/);
  assert.doesNotMatch(html, /\]-/);
});

test('repairs smashed head injury red flag bullets after citation clusters', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('CT is indicated for: [1, 2, 3]- Focal neurologic deficits [1]- Signs of skull fracture [2]- Recurrent vomiting [3]', sources);
  assert.match(html, /<li>Focal neurologic deficits/);
  assert.match(html, /<li>Signs of skull fracture/);
  assert.match(html, /<li>Recurrent vomiting/);
  assert.doesNotMatch(html, /\]-/);
});

test('preserves code block contents without creating citation links inside code', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('```js\nconst ref = "[1]";\n```', sources);
  assert.match(html, /<pre><code>const ref = &quot;\[1\]&quot;/);
  assert.doesNotMatch(html, /assistant-source-1/);
});

test('does not repair model-split markdown tables', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Summary Table\n| Indication for Use | Dose (IV) | Max Dose\n\n| Infusion Time | Monitoring/Precautions |\n|-----------------------------------------|----------------------------|----------|--------------|---------------------------------------|\n| Severe exacerbation unresponsive to SABA/anticholinergic | 25-75 mg/kg | 2 g\n| 20 min | BP, reflexes, respiratory status[1, 2] |', sources);
  assert.doesNotMatch(html, /Max Dose Infusion Time/);
  assert.match(html, /Infusion Time/);
  assert.match(html, /assistant-cite/);
});

test('breaks inline numbered clinical sections onto new lines', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Monitor with serial abdominal exams [1]. 2. Imaging\nImmediate abdominal X-ray for obstruction [1, 2]. 3. Laboratory Studies\nAssess electrolytes if ill-appearing [3]. 4. Surgical Consultation\nUrgent pediatric surgical consultation [1].', sources);
  assert.match(html, /2\. Imaging/);
  assert.match(html, /3\. Laboratory Studies/);
  assert.match(html, /4\. Surgical Consultation/);
  assert.doesNotMatch(html, /exams[^<]*2\. Imaging/);
  assert.doesNotMatch(html, /obstruction[^<]*3\. Laboratory Studies/);
});

test('strips orphan trailing markdown emphasis markers', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const html = renderAssistantMarkdown('Summary Table\n\nAge Group\tEmpiric Antibiotics\n<1 month\tAmpicillin + cefotaxime\n**', sources);
  assert.match(html, /Summary Table/);
  assert.doesNotMatch(html, /\*\*/);
});

test('strips orphan trailing markdown marker after tab-separated text', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const markdownIt = new MarkdownIt({ html: false, linkify: true, typographer: true, breaks: true });
  const input = 'Summary Table\nStep\tRecommendation\nBlood culture\tObtain before antibiotics\nHospitalization\tYes, for all febrile neonates <=28 days old\n**';
  const html = renderAssistantMarkdown(input, sources, { markdownIt });
  assert.doesNotMatch(html, /<table>/);
  assert.match(html, /Hospitalization/);
  assert.doesNotMatch(html, /\*\*/);
});

test('keeps summary paragraph outside tab-separated text', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const markdownIt = new MarkdownIt({ html: false, linkify: true, typographer: true, breaks: true });
  const input = 'Summary Table\nStep/Indication\tRecommendation/Threshold\tCitation\nInitial assessment\tABCs and focused exam\t[1]\nActivated charcoal window\tWithin 1 hour\t[2]\nIn summary: rapidly assess ABCs and consider activated charcoal when appropriate [1, 2].';
  const html = renderAssistantMarkdown(input, sources, { markdownIt });
  assert.doesNotMatch(html, /<table>/);
  assert.match(html, /In summary:/);
  assert.doesNotMatch(html, /<td>In summary:/);
});

test('strips trailing marker after notes followed by tab-separated text', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const markdownIt = new MarkdownIt({ html: false, linkify: true, typographer: true, breaks: true });
  const input = 'Additional Notes\nListeria coverage: Ampicillin should be added for infants <3 months [1].\nVancomycin: Added for resistant pneumococcus [2].\nAge Group\tEmpiric Antibiotics\n<1 month\tAmpicillin + Cefotaxime\n1-23 months\tVancomycin + Cefotaxime or Ceftriaxone\n>=24 months\tVancomycin + Cefotaxime or Ceftriaxone\n**';
  const html = renderAssistantMarkdown(input, sources, { markdownIt });
  assert.match(html, /Additional Notes/);
  assert.doesNotMatch(html, /<table>/);
  assert.doesNotMatch(html, /\*\*/);
});

test('links citation-only cells in markdown pipe tables', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const markdownIt = new MarkdownIt({ html: false, linkify: true, typographer: true, breaks: true });
  const input = '| Step | Purpose | Source(s) |\n|---|---|---|\n| Surgical consult | Urgent assessment | [1, 2] |\n| X-ray | Assess obstruction | [3] |';
  const html = renderAssistantMarkdown(input, sources, { markdownIt });
  assert.match(html, /<table>/);
  assert.match(html, /data-source-number="1"/);
  assert.match(html, /data-source-number="2"/);
  assert.match(html, /data-source-number="3"/);
  assert.doesNotMatch(html, /<td>\[1, 2\]<\/td>/);
});

test('uses markdown-it stack for GFM-style tables when provided', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const markdownIt = new MarkdownIt({ html: false, linkify: true, typographer: true, breaks: true });
  const html = renderAssistantMarkdown('| Age | Antibiotics |\n|---|---|\n| <1 month | Ampicillin + cefotaxime [1] |', sources, { markdownIt });
  assert.match(html, /<table>/);
  assert.match(html, /<td>&lt;1 month<\/td>/);
  assert.match(html, /assistant-cite/);
});

test('renders pipe summary tables and removes trailing emphasis junk', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const markdownIt = new MarkdownIt({ html: false, linkify: true, typographer: true, breaks: true });
  const input = 'Summary Table\n\n| Situation | Imaging Recommended | Timing/Notes |\n|---|---|---|\n| First febrile UTI | Renal/bladder ultrasound | After recovery |\n| Routine use of DMSA scan | Not recommended | |\n**';
  const html = renderAssistantMarkdown(input, sources, { markdownIt });
  assert.match(html, /<table>/);
  assert.match(html, /<th>Situation<\/th>/);
  assert.match(html, /<td>Routine use of DMSA scan<\/td>/);
  assert.doesNotMatch(html, /\*\*/);
});

test('does not repair malformed tab-separated clinical summary rows into a table', async () => {
  const { renderAssistantMarkdown } = await loadCitationModule();
  const markdownIt = new MarkdownIt({ html: false, linkify: true, typographer: true, breaks: true });
  const input = 'Summary Table\nStep\tDetails\tSource\nRed Flags\tShock, peritonitis, distension\t3 4 7\nInitial Imaging\tAbdominal X-ray if perforation suspected, then ultrasound\n2 3 7\t\tDiagnostic Gold Std\nAbdominal ultrasound target sign\t2 3 7 Nonoperative Reduction\tAir or contrast enema if stable\nSurgical Indications\tShock, peritonitis, perforation, failed reduction\n1 3 7\t\tRecurrence Rate\n~10% after nonsurgical reduction\t5 6 7\tIf you need details on recurrence management, please specify.';
  const html = renderAssistantMarkdown(input, sources, { markdownIt, citationLabel: 'number' });
  assert.doesNotMatch(html, /<table>/);
  assert.match(html, /Initial Imaging/);
  assert.match(html, /If you need details/);
});