const fs = require('fs');
const path = require('path');

const sourcePath = path.join(__dirname, '..', 'public', 'js', 'webgl-book-lab.js');
const source = fs.readFileSync(sourcePath, 'utf8');

const checks = [
    ['scene-level SSAO import', /SSAOPass/.test(source)],
    ['postprocess anti-aliasing import', /SMAAPass/.test(source)],
    ['composer uses explicit render target', /new THREE\.WebGLRenderTarget\(1, 1/.test(source) && /new EffectComposer\(renderer, sceneComposerTarget\)/.test(source)],
    ['composer render path is active', /composer\.render\(\)/.test(source)],
    ['static table maps are loaded from disk', /table_normal_2k\.png/.test(source) && /table_dust_4k\.png/.test(source) && /table_grease_4k\.png/.test(source)],
    ['runtime table map generators removed from page', !/function createTableNormalTexture|function createTableDustTexture|function createTableGreaseTexture/.test(source)],
    ['table primitive shadow receiving disabled', /tableMesh\.receiveShadow = false/.test(source)],
    ['flames excluded from AO', /excludeFromAo = true/.test(source) && /aoExcludedObjects\.push\(child\)/.test(source)],
    ['AO pass hides excluded objects with cleanup', /sceneAoPass\.render = \(\.\.\.args\) =>/.test(source) && /finally/.test(source)],
    ['AO uses scene-scale sampling', /new SSAOPass\(scene, camera, 1, 1, 64\)/.test(source) && /sceneAoPass\.kernelRadius = 0\.48/.test(source) && /sceneAoPass\.minDistance = 0\.00025/.test(source) && /sceneAoPass\.maxDistance = 0\.065/.test(source)],
    ['AO debug shows blurred occlusion map', /tableDebugName === 'ao' && SSAOPass\.OUTPUT\?\.Blur/.test(source) && /sceneAoPass\.output = SSAOPass\.OUTPUT\.Blur/.test(source)],
    ['direct candle shadow lobe present', /candlePlanarShadowLobe/.test(source) && /candlePlanarShadowField/.test(source)],
    ['direct candle shadow contributes to final table shader', /max\(candleProjectedShadowField\(vTableWorldPosition\), candlePlanarShadowField\(vTableWorldPosition\)\)/.test(source) && /bookMeshShadowField\(vTableWorldPosition\)/.test(source)],
    ['book shadows use real light-space depth maps', /bookShadowTargets/.test(source) && /MeshDepthMaterial/.test(source) && /updateBookShadowMaps/.test(source) && /bookMeshShadowField/.test(source) && /bookShadowMaps\[0\]/.test(source)],
    ['book materials receive real shadow maps', /configureBookShadowReceiver\(materials\.leftPage/.test(source) && /bookReceiverShadowField/.test(source) && /bookShadowReceiverStrength/.test(source)],
    ['proxy book shadow shortcuts are forbidden', !/bookPlanarShadowLobe|bookProjectedShadowField|bookBoxShadow|segmentBoxHit/.test(source)],
    ['final candle shadow is visible in composite', /candleOcclusion = clamp\(candleProjectedShadow \* 1\.46, 0\.0, 0\.82\)/.test(source) && /vec3\(0\.19, 0\.15, 0\.115\), candleOcclusion/.test(source)],
    ['primitive candle shadow shortcuts stay disabled', /wax\.castShadow = false/.test(source) && /wick\.castShadow = false/.test(source) && /leftPage\.receiveShadow = false/.test(source) && /rightPage\.receiveShadow = false/.test(source)],
    ['analytic contact fallback removed', !/surfaceContactOcclusion|candleContactField|candleContactOcclusion|bookContactField|candleFootOcclusion|contactAo/.test(source)],
    ['debug AO remains scene-level', /scene debug: SSAO/.test(source)],
    ['contact debug mode removed', !/contact:\s*9|tableDebugMode == 9/.test(source)],
    ['render readiness flag is exposed', /BookLabDebug\.ready/.test(source) && /BookLabDebug\.renderedFrames/.test(source)]
];

const failures = checks.filter(([, passed]) => !passed).map(([name]) => name);

if (failures.length) {
    console.error('WebGL book lab regression checks failed:');
    failures.forEach((name) => console.error(`- ${name}`));
    process.exit(1);
}

console.log(`WebGL book lab regression checks passed (${checks.length}).`);