import assert from 'node:assert/strict';
import fs from 'node:fs/promises';
import path from 'node:path';
import test from 'node:test';
import vm from 'node:vm';

const root = path.resolve(import.meta.dirname, '..');

async function catalogue(namespace) {
  const filename = path.join(root, 'public/js/group-symbols.js');
  const context = { Wegwichtel: namespace };
  context.globalThis = context;
  vm.runInNewContext(await fs.readFile(filename, 'utf8'), context, { filename });
  return context.Wegwichtel.GroupSymbols;
}

test('group motifs resolve all eight approved Unicode symbols to existing PNG assets', async () => {
  const existing = { Config: { apiBase: '/api' } };
  const symbols = await catalogue(existing);
  assert.equal(existing.Config.apiBase, '/api');
  const expected = ['🍎', '🔑', '🔔', '📘', '🌻', '☂️', '⚽', '☕'];
  assert.deepEqual(Array.from(symbols.list(), entry => entry.unicode), expected);
  assert.equal(new Set(symbols.list().map(entry => entry.unicode)).size, 8);
  for (const entry of symbols.list()) {
    assert.equal(symbols.get(entry.unicode), entry);
    assert.equal(symbols.has(entry.unicode), true);
    assert.equal(symbols.imageUrl(entry.unicode), entry.imageUrl);
    assert.equal(entry.imageUrl, `/images/group-symbols/${entry.unicode}.png`);
    assert.ok(entry.label.length > 0);
    const png = await fs.readFile(path.join(root, 'public', entry.imageUrl));
    assert.deepEqual(png.subarray(0, 8), Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]));
    assert.equal(png[25], 6, 'each motif must be an RGBA PNG');
    assert.equal(Object.isFrozen(entry), true);
  }
  assert.equal(Object.isFrozen(symbols.list()), true);
  assert.throws(() => { symbols.list()[0].label = 'changed'; }, TypeError);
  assert.throws(() => symbols.list().push({}), { name: 'TypeError' });
});

test('Unicode presentation selectors resolve to one motif and invalid inputs stay unknown', async () => {
  const symbols = await catalogue();
  for (const base of ['☂', '⚽', '☕']) {
    assert.equal(symbols.get(base), symbols.get(`${base}\uFE0F`));
    assert.equal(symbols.get(base), symbols.get(`${base}\uFE0E`));
  }
  for (const value of ['', '🍎🔑', 'unknown', ' 🍎 ', null, undefined, 42, {}]) {
    assert.equal(symbols.get(value), null);
    assert.equal(symbols.imageUrl(value), null);
    assert.equal(symbols.has(value), false);
  }
});