/**
 * No movement hall floor tint may blow out as near-white.
 *   node --test server/__tests__/floor-brightness.test.js
 */
const { describe, it } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');

const ROOT = path.join(__dirname, '..', '..');
const STYLES = fs.readFileSync(path.join(ROOT, 'client/src/data/movement-interior-styles.ts'), 'utf8');

/** Soft ceiling — mid stone / warm wood, not gallery flood. */
const MAX_FLOOR_LUMINANCE = 0.58;

function luminance(hex) {
  const n = parseInt(hex.slice(1), 16);
  const r = (n >> 16) & 255;
  const g = (n >> 8) & 255;
  const b = n & 255;
  return (0.2126 * r + 0.7152 * g + 0.0722 * b) / 255;
}

function floorTints() {
  // tints objects inside mk(): wall/ceiling/floor hex triples (optional wallSide)
  const re =
    /\{\s*wall:\s*'#[^']+',(?:\s*wallSide:\s*'#[^']+',)?\s*ceiling:\s*'#[^']+',\s*floor:\s*'(#[0-9a-fA-F]{6})'/g;
  const out = [];
  let m;
  while ((m = re.exec(STYLES))) out.push(m[1]);
  return out;
}

describe('Movement floors — no blown-out brightness', () => {
  it('every authored floor tint stays at or below mid-stone luminance', () => {
    const floors = floorTints();
    assert.ok(floors.length >= 20, `expected many floor tints, got ${floors.length}`);
    const offenders = floors
      .map((hex) => ({ hex, L: luminance(hex) }))
      .filter((f) => f.L > MAX_FLOOR_LUMINANCE);
    assert.deepEqual(
      offenders,
      [],
      offenders.map((f) => `${f.hex} L=${f.L.toFixed(3)}`).join(', ')
    );
  });

  it('Baroque floor is subdued warm marble, not near-white', () => {
    const start = STYLES.indexOf("'baroque-palace'");
    assert.ok(start >= 0);
    const block = STYLES.slice(start, STYLES.indexOf('mk(', start + 1));
    const m = block.match(/ceiling:\s*'#[^']+',\s*floor:\s*'(#[0-9a-fA-F]{6})'/);
    assert.ok(m);
    assert.ok(luminance(m[1]) <= MAX_FLOOR_LUMINANCE);
    assert.doesNotMatch(block, /floor: '#ece8e0'/);
  });
});