'use strict';

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

const viewer = fs.readFileSync('viewer/spine.html', 'utf8');
const releaseViewer = fs.readFileSync('release/UNIVERSAL_SpineViewer/viewer/spine.html', 'utf8');
const server = fs.readFileSync('SpineThumbnailGenerateServer/js/renderer.js', 'utf8');

function functionSource(source, name) {
	const start = source.indexOf(`function ${name}(`);
	assert.ok(start >= 0, `missing ${name}`);
	const open = source.indexOf('{', start);
	let depth = 0;
	for (let index = open; index < source.length; index++) {
		if (source[index] === '{') depth++;
		else if (source[index] === '}' && --depth === 0) return source.slice(start, index + 1);
	}
	throw new Error(`unterminated ${name}`);
}

const calls = [];
const skeleton = {
	update(delta) { calls.push(['time', delta]); },
	updateWorldTransform(mode) { calls.push(['world', mode]); },
};
vm.runInNewContext(`const spine = { Physics: { update: 'update', reset: 'reset' } }; ${functionSource(viewer, 'updateWorld')}; updateWorld(skeleton, 0.05); updateWorld(skeleton, 0, true);`, { skeleton, calls });
assert.deepEqual(calls, [['time', 0.05], ['world', 'update'], ['world', 'reset']]);

assert.equal(viewer, releaseViewer, 'release viewer must mirror the source viewer');
assert.match(viewer, /MAX_FRAME_DELTA = 0\.064[\s\S]*updateWorld\(skeleton, frameDelta\)/);
assert.match(viewer, /time - previousTime[\s\S]*previousTime === undefined/);
assert.match(server, /skeleton\.update\(delta\)[\s\S]*spine\.Physics\.reset/);
assert.match(server, /time - previousTime[\s\S]*previousTime === undefined/);

console.log('PASS: Spine 4.2+ physics advances time and resets between sampling passes');