/**
 * Side-wall paintings must not hang in front of bay columns/pilasters.
 * Columns stay fixed; the hang skips column keep-outs (and windows must too).
 *   node --test server/__tests__/painting-column-clearance.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 KEEP = fs.readFileSync(path.join(ROOT, 'client/src/utils/sideColumnKeepOuts.ts'), 'utf8');
const LAYOUT = fs.readFileSync(path.join(ROOT, 'client/src/utils/movementHallLayout.ts'), 'utf8');
const GEOMETRY = fs.readFileSync(path.join(ROOT, 'client/src/components/hall-details/geometry.ts'), 'utf8');
const GALLERY = fs.readFileSync(path.join(ROOT, 'client/src/components/VirtualGallery.tsx'), 'utf8');

/** Mirror of bayPositions — must stay in lockstep with sideColumnKeepOuts.ts / geometry.ts */
function bayPositions(depth, halfD, spacing = 4.2, max = 9) {
  const count = Math.max(2, Math.min(max, Math.floor(depth / spacing)));
  const step = depth / (count + 1);
  return Array.from({ length: count }, (_, i) => -halfD + step * (i + 1));
}

function parseRhythmTable(src) {
  const start = src.indexOf('SIDE_WALL_COLUMN_RHYTHMS');
  assert.ok(start >= 0, 'SIDE_WALL_COLUMN_RHYTHMS export missing');
  const bodyStart = src.indexOf('{', start);
  const bodyEnd = src.indexOf('} as const', bodyStart);
  assert.ok(bodyEnd > bodyStart);
  const body = src.slice(bodyStart, bodyEnd + 1);
  const rhythms = {};
  for (const m of body.matchAll(
    /['"]?([a-z0-9-]+)['"]?:\s*\{\s*spacing:\s*([\d.]+),\s*max:\s*(\d+),\s*halfClear:\s*([\d.]+)\s*\}/g
  )) {
    rhythms[m[1]] = { spacing: Number(m[2]), max: Number(m[3]), halfClear: Number(m[4]) };
  }
  return rhythms;
}

describe('Painting ↔ column clearance', () => {
  it('exports bayPositions shared by geometry and keep-outs', () => {
    assert.match(KEEP, /export function bayPositions/);
    assert.match(GEOMETRY, /bayPositions/);
    assert.match(GEOMETRY, /useBayZ[\s\S]*bayPositions/);
  });

  it('registers keep-outs for every mid-wall bay column style', () => {
    const rhythms = parseRhythmTable(KEEP);
    for (const kind of [
      'gothic',
      'roman',
      'quattrocento',
      'cinquecento',
      'mannerist',
      'neoclassical',
      'gothic-revival',
      'art-nouveau',
    ]) {
      assert.ok(rhythms[kind], `missing rhythm for ${kind}`);
      assert.ok(rhythms[kind].halfClear >= 0.18, `${kind} halfClear too small`);
    }
  });

  it('layout packs side walls around column keep-outs and grows depth if needed', () => {
    assert.match(LAYOUT, /sideColumnKeepOutIntervals/);
    assert.match(LAYOUT, /depthForSideHang|sideWallGaps/);
    assert.match(LAYOUT, /details\?:\s*MovementDetailKind/);
    assert.match(LAYOUT, /buildAllMovementHallLayouts\(\s*paintings:\s*Painting\[\],\s*details\?/);
  });

  it('windows treat column keep-outs as occupied so they do not land on columns', () => {
    const fn = LAYOUT.slice(LAYOUT.indexOf('export function computeSideWallWindows'));
    assert.match(fn, /sideColumnKeepOutIntervals/);
    assert.match(fn, /columnKeepOuts/);
  });

  it('VirtualGallery passes the movement detail kind into hall layout', () => {
    assert.match(GALLERY, /buildAllMovementHallLayouts\(\s*paintings\s*,\s*interiorStyle\?\.details\s*\)/);
  });

  it('bay keep-out intervals cover each column centre for a typical hall depth', () => {
    const rhythms = parseRhythmTable(KEEP);
    const depth = 14;
    const halfD = depth / 2;
    for (const [kind, r] of Object.entries(rhythms)) {
      const zs = bayPositions(depth, halfD, r.spacing, r.max);
      assert.ok(zs.length >= 2, kind);
      for (const z of zs) {
        const lo = z - r.halfClear;
        const hi = z + r.halfClear;
        assert.ok(lo < z && z < hi, `${kind} keep-out must contain bay centre`);
        // A typical frame half-width centred on the column would collide
        const halfOuter = 0.35;
        assert.ok(z - halfOuter < hi && z + halfOuter > lo, `${kind} frame would overlap column`);
      }
    }
  });
});