import { expect, it, vi } from 'vitest';
import { build } from 'vite';

it('keeps Monaco lazy, production chunks below 500 kB, and static imports acyclic', async () => {
  vi.stubEnv('NODE_ENV', 'production');
  const result = await build({ build: { write: false }, logLevel: 'silent' }).finally(() => vi.unstubAllEnvs());
  if (!('output' in result)) throw new Error('Expected a single application build');
  const chunks = result.output.filter(asset => asset.type === 'chunk');
  const byName = new Map(chunks.map(chunk => [chunk.fileName, chunk]));
  const visited = new Set<string>();
  function visit(name: string, ancestors: string[] = []) {
    expect(ancestors, `Static chunk cycle: ${[...ancestors, name].join(' -> ')}`).not.toContain(name);
    if (visited.has(name)) return;
    const chunk = byName.get(name);
    if (!chunk) return;
    chunk.imports.forEach(dependency => visit(dependency, [...ancestors, name]));
    visited.add(name);
  }
  for (const chunk of chunks) {
    expect(Buffer.byteLength(chunk.code), chunk.fileName).toBeLessThanOrEqual(500_000);
    visit(chunk.fileName);
  }
  const entry = chunks.find(chunk => chunk.isEntry)!;
  visited.clear();
  visit(entry.fileName);
  for (const name of visited) {
    expect(Object.keys(byName.get(name)!.modules).some(id => id.includes('/monaco-editor/'))).toBe(false);
  }
  expect(chunks.some(chunk => chunk.isDynamicEntry && chunk.name === 'MonacoProfileEditor')).toBe(true);
}, 60_000);