'use strict';

const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const test = require('node:test');

const root = path.resolve(__dirname, '..', '..');
const read = (file) => fs.readFileSync(path.join(root, file), 'utf8');

// .but.cir icon buttons center via inline-flex; the 0.25em icon margin rule
// (.but > i[class*="fa-"]:not(.fa-angle-right), specificity 0,3,1) must be
// outranked by the reset, or glyphs like fa-ellipsis-h sit left of center.
const resetSelectors = [
  '.but.cir svg.icon',
  '.but.cir > .fa,',
  '.but.cir > .fa:not(.fa-angle-right),',
  '.but.cir > i[class*="fa-"]:not(.fa-angle-right)',
];

test('buttons.css resets direct-child icon margins on circular buttons', () => {
  const buttons = read('assets/css/core/buttons.css');
  const resetStart = buttons.indexOf('.but.cir svg.icon,');
  assert.notEqual(resetStart, -1, 'missing .but.cir icon margin reset');
  const resetBlock = buttons.slice(resetStart, buttons.indexOf('}', resetStart));
  for (const selector of resetSelectors) {
    assert.ok(resetBlock.includes(selector), `reset is missing selector: ${selector}`);
  }
  assert.match(resetBlock, /margin:\s*0\s*;/);

  const marginStart = buttons.indexOf('.but .icon,');
  assert.notEqual(marginStart, -1);
  assert.ok(marginStart < resetStart, 'margin rule must precede the reset');
});

test('the built public bundle carries the reset after the margin rule', () => {
  const bundle = read('assets/css/build/public.min.css');
  const minifiedReset = bundle.indexOf('.but.cir>i[class*=fa-]:not(.fa-angle-right){margin:0}');
  assert.notEqual(minifiedReset, -1, 'missing minified .but.cir icon margin reset');

  const marginRule = /\.but>i\[class\*=fa-\]:not\(\.fa-angle-right\)\{margin-right:\.25em\}/g;
  let lastMargin = -1;
  for (const match of bundle.matchAll(marginRule)) {
    lastMargin = match.index;
  }
  assert.notEqual(lastMargin, -1, 'expected the icon margin rule to still exist');
  assert.ok(minifiedReset > lastMargin, 'reset must appear after the last margin rule copy');
});