const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const { pathToFileURL } = require('node:url');
const { JSDOM } = require('jsdom');
const root = path.join(__dirname, '..');
const read = file => fs.readFileSync(path.join(root, file), 'utf8');
const tick = () => new Promise(resolve => setImmediate(resolve));

function browserGlobals(t, dom, fetch, toasts) {
  const values = { window: dom.window, document: dom.window.document, fetch, getAuthHeaders: () => ({ 'X-Test': 'synthetic' }), showToast: (...args) => toasts.push(args) };
  const originals = Object.keys(values).map(key => [key, Object.getOwnPropertyDescriptor(global, key)]);
  Object.assign(global, values);
  Object.assign(dom.window, { fetch, getAuthHeaders: values.getAuthHeaders });
  t.after(() => {
    for (const [key, descriptor] of originals) { if (descriptor) Object.defineProperty(global, key, descriptor); else delete global[key]; }
    dom.window.close();
  });
}

test('native admin initializer preserves lazy navigation, assistant actions and read-only ENV budget metadata', async t => {
  const dom = new JSDOM('<button class="tab-btn active" data-tab="home">Home</button><button class="tab-btn" data-tab="admin">Admin</button><div id="home-tab" class="tab-content" data-component="home" data-loaded="1"></div><div id="admin-tab" class="tab-content" data-component="admin"></div>', { runScripts: 'outside-only', url: 'https://app.example' });
  const calls = []; const toasts = [];
  const fetch = async (url, options = {}) => {
    calls.push({ url, options });
    let data = {};
    if (url.startsWith('/components/admin.html?')) return { ok: true, text: async () => read('public/components/admin.html') };
    if (url === '/api/models') data = { models: [{ id: 'chat', name: 'Chat' }], defaultModel: 'chat' };
    if (url === '/api/admin/config') {
      assert.ok(document.getElementById('assistant-chat-model'), 'tabChanged fires after lazy markup exists');
      data = { success: true, conversationBudget: { limit: 240000, unit: 'characters', measure: 'UTF-16 code units', env: 'CLINICAL_ASSISTANT_CONVERSATION_CHARS', source: 'environment' }, config: [{ key: 'clinical_assistant.conversation_chars', value: '999999' }, { key: 'clinical_assistant.image_model', value: 'saved-image' }] };
    }
    if (url === '/api/admin/config/image-models/discover') data = { models: [{ id: 'image', name: 'Image' }] };
    if (url === '/api/admin/clinical-assistant/prompt-pool') data = { success: true, meta: { count: 3 }, snapshots: [{ id: 7, count: 3 }] };
    if (options.method) data = { success: true, duration: 1, response: 'Synthetic', meta: { count: 4 }, snapshots: [{ id: 7, count: 4 }] };
    return { ok: true, json: async () => data };
  };
  browserGlobals(t, dom, fetch, toasts);
  await import(pathToFileURL(path.join(root, 'public/js/admin.js')).href);
  assert.equal(calls.length, 0, 'registration must not eagerly load assistant settings');
  // JSDOM does not execute native script tags. Import the unmodified ESM above,
  // then execute the real classic app entrypoint and its component loader.
  await tick();
  dom.window.eval(read('public/js/app.js'));
  document.dispatchEvent(new dom.window.Event('DOMContentLoaded'));
  await tick();
  assert.equal(document.getElementById('assistant-chat-model'), null);
  document.querySelector('[data-tab="admin"]').click();
  await tick(); await tick();
  assert.equal(document.getElementById('admin-tab').dataset.loaded, '1');
  assert.equal(document.getElementById('assistant-chat-model').options[0].textContent, 'Use global default (chat)');
  assert.equal(document.getElementById('assistant-image-model'), null, 'single image-model dropdown lives in workflow-image-settings');
  assert.match(document.getElementById('assistant-prompt-pool-status').textContent, /3 prompts/);
  const budget = document.getElementById('assistant-conversation-budget');
  assert.equal(document.querySelectorAll('#assistant-conversation-chars').length, 0);
  assert.match(budget.textContent, /240,000 characters \(UTF-16 code units\).*CLINICAL_ASSISTANT_CONVERSATION_CHARS \(environment\)/);
  assert.doesNotMatch(budget.textContent, /999/);
  const initialConfigLoads = calls.filter(c => c.url === '/api/admin/config').length;
  document.querySelector('[data-tab="home"]').click(); await tick();
  document.querySelector('[data-tab="admin"]').click(); await tick();
  assert.equal(calls.filter(c => c.url.startsWith('/components/admin.html?')).length, 1);
  assert.equal(calls.filter(c => c.url === '/api/admin/config').length, initialConfigLoads, 'initializer loads once across revisits');

  const writes = () => calls.filter(c => c.options.method === 'PUT');
  const save = document.getElementById('btn-save-assistant-config');
  save.click(); await tick();
  assert.equal(writes().length, 4);
  assert.deepEqual(writes().map(c => c.url.split('/').pop()).sort(), [
    'clinical_assistant.chat_model', 'clinical_assistant.context_chars', 'clinical_assistant.search_limit', 'clinical_assistant.translate_provider'
  ]);
  assert.ok(toasts.some(([message, kind]) => message === 'Assistant settings saved' && kind === 'success'));

  document.getElementById('btn-test-assistant-chat-model').click(); await tick();
  assert.deepEqual(JSON.parse(calls.find(c => c.url === '/api/admin/config/models/test').options.body), { modelId: 'chat' });
  document.getElementById('btn-regenerate-assistant-prompt-pool').click(); await tick();
  assert.equal(document.getElementById('btn-regenerate-assistant-prompt-pool').disabled, false);
  document.getElementById('assistant-prompt-pool-snapshots').value = '7';
  document.getElementById('btn-restore-assistant-prompt-pool').click(); await tick();
  assert.deepEqual(JSON.parse(calls.find(c => c.url.endsWith('/prompt-pool/restore')).options.body), { id: 7 });
  assert.equal(document.getElementById('assistant-custom-image-model'), null);
  assert.equal(document.getElementById('btn-test-assistant-image-model'), null);
  assert.equal(document.getElementById('btn-use-custom-assistant-image-model'), null);
  await tick();
});

test('real extracted initializer never invents a cap when metadata is missing, invalid or returns 503', async t => {
  const { initClinicalAssistantAdmin } = await import(pathToFileURL(path.join(root, 'public/js/admin/clinicalAssistant.js')).href);
  for (const data of [{}, { success: false, error: 'Invalid environment' }, { success: true, conversationBudget: { limit: 1000001 } }]) {
    await t.test(JSON.stringify(data), async t => {
      const dom = new JSDOM(read('public/components/admin.html'));
      browserGlobals(t, dom, async () => ({ status: 503, json: async () => data }), []);
      initClinicalAssistantAdmin(value => value);
      document.dispatchEvent(new dom.window.CustomEvent('tabChanged', { detail: { tab: 'admin' } }));
      await tick();
      assert.match(document.getElementById('assistant-conversation-budget').textContent, /unavailable/);
      assert.doesNotMatch(document.getElementById('assistant-conversation-budget').textContent, /120,?000|1,?000,?001/);
    });
  }
});

test('real extracted initializer displays the server default only when returned as metadata', async t => {
  const dom = new JSDOM(read('public/components/admin.html'));
  browserGlobals(t, dom, async () => ({ ok: true, json: async () => ({ success: true, config: [], models: [], conversationBudget: {
    limit: 120000, unit: 'characters', measure: 'UTF-16 code units', env: 'CLINICAL_ASSISTANT_CONVERSATION_CHARS', source: 'default'
  } }) }), []);
  const { initClinicalAssistantAdmin } = await import(pathToFileURL(path.join(root, 'public/js/admin/clinicalAssistant.js')).href);
  initClinicalAssistantAdmin(value => value);
  document.dispatchEvent(new dom.window.CustomEvent('tabChanged', { detail: { tab: 'admin' } }));
  await tick();
  assert.match(document.getElementById('assistant-conversation-budget').textContent, /120,000 characters \(UTF-16 code units\).*server default; environment unset/);
});