/**
 * Neoclassical museum floor must not blow out as near-white marble.
 *   node --test server/__tests__/neoclassical-interior.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');

function neoclassicalBlock() {
  const start = STYLES.indexOf("'neoclassical-museum'");
  assert.ok(start >= 0, 'neoclassical-museum style must exist');
  const next = STYLES.indexOf('mk(', start + 1);
  return STYLES.slice(start, next > start ? next : undefined);
}

function floorTintHex(block) {
  const m = block.match(/floor:\s*'#[0-9a-fA-F]{6}'/);
  assert.ok(m, 'floor tint hex must be present in tints object');
  // Prefer the tints line: `{ wall: '...', ceiling: '...', floor: '#......', trim: '...' }`
  const tints = block.match(/\{\s*wall:\s*'#[^']+',\s*ceiling:\s*'#[^']+',\s*floor:\s*'(#[0-9a-fA-F]{6})'/);
  assert.ok(tints, 'tints.floor must be a hex color');
  return tints[1];
}

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;
}

describe('Neoclassical interior — subdued stone floor', () => {
  it('floor tint is mid stone grey, not near-white', () => {
    const block = neoclassicalBlock();
    const hex = floorTintHex(block);
    assert.ok(luminance(hex) < 0.62, `floor luminance ${luminance(hex).toFixed(2)} for ${hex} is still too bright`);
    assert.doesNotMatch(block, /floor: '#eceae6'/);
  });

  it('skylight is not overdriven for the marble floor', () => {
    const block = neoclassicalBlock();
    const sky = block.match(/style: 'skylight',\s*lightColor: '[^']+',\s*lightIntensity:\s*([0-9.]+)/);
    assert.ok(sky, 'skylight must exist');
    assert.ok(Number(sky[1]) <= 3.6, `skylight intensity ${sky[1]} is still too strong`);
  });
});