import { existsSync, readdirSync, readFileSync } from 'node:fs';
import { join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { describe, expect, it } from 'vitest';

const CORE = fileURLToPath(new URL('../src/core/', import.meta.url));
const FORBIDDEN =
  /(?:from\s+|import\s*\(\s*|require\s*\(\s*)['"](?:obsidian|fs|path|child_process|node:[^'"]*)(?:\/[^'"]*)?['"]/;

function coreFiles(): string[] {
  if (!existsSync(CORE)) return [];
  return readdirSync(CORE, { recursive: true, encoding: 'utf8' })
    .filter((f) => f.endsWith('.ts'))
    .map((f) => join(CORE, f));
}

describe('src/core boundary', () => {
  it('detects forbidden imports', () => {
    expect(FORBIDDEN.test(`import { Plugin } from 'obsidian';`)).toBe(true);
    expect(FORBIDDEN.test(`import { readFile } from "fs/promises";`)).toBe(true);
    expect(FORBIDDEN.test(`import x from 'node:path';`)).toBe(true);
    expect(FORBIDDEN.test(`const cp = require('child_process');`)).toBe(true);
    expect(FORBIDDEN.test(`import { transition } from './record';`)).toBe(false);
  });

  it('has files to check', () => {
    expect(coreFiles().length).toBeGreaterThan(0);
  });

  it('imports neither obsidian nor Node modules', () => {
    const offenders = coreFiles().filter((f) => FORBIDDEN.test(readFileSync(f, 'utf8')));
    expect(offenders).toEqual([]);
  });
});