/**
 * @module tests/unit/boundary-no-native
 * @description Enforces the open-source / proprietary boundary in CI: the public
 * MIT Brainy repo must never DEPEND ON the proprietary native-acceleration
 * package to build or test. That package is **`@soulcraft/cor`** (formerly
 * `@soulcraft/cortex` — both names are guarded here through the rename
 * transition). Brainy may NAME it (docs say `npm install @soulcraft/cor`, error
 * messages point at its `idSpace:'u64'` mode) and registering it through the
 * public plugin API is the supported runtime path — but nothing in `src/` or
 * `tests/` may statically `import`/`require` it, and it must not appear in any
 * dependency field.
 *
 * This is load-bearing for the lockstep release model: because brainy cannot
 * depend on `@soulcraft/cor`, the combined brainy-8.0 × cor-3.0 integration
 * matrix (the "every code path proven with both engines" proof) lives in the
 * **cor** repo, which devDeps brainy — NOT here. See handoff LOCKSTEP-VERIFY.
 * If this test ever needs `@soulcraft/cor` to go green, the boundary has been
 * violated and an optional integration became a hard coupling on a private build.
 */
import { describe, it, expect } from 'vitest'
import * as fs from 'node:fs'
import * as path from 'node:path'
import { fileURLToPath } from 'node:url'

const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../..')
const SELF = fileURLToPath(import.meta.url)

/** The proprietary native package, across the cortex→cor rename. */
const NATIVE_PACKAGES = ['@soulcraft/cor', '@soulcraft/cortex'] as const

/** Recursively collect .ts/.js/.mjs/.cjs files under a directory. */
function sourceFiles(dir: string): string[] {
  const out: string[] = []
  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
    if (entry.name === 'node_modules' || entry.name === 'dist' || entry.name.startsWith('.')) continue
    const full = path.join(dir, entry.name)
    if (entry.isDirectory()) out.push(...sourceFiles(full))
    else if (/\.(ts|js|mjs|cjs)$/.test(entry.name) && full !== SELF) out.push(full)
  }
  return out
}

// Matches a real module specifier for the native package in an
// import/require/dynamic-import — NOT a bare string mention (docs / JSDoc /
// error-message / mock-name are allowed). `@soulcraft/cor` and
// `@soulcraft/cortex` both match; `@soulcraft/core` (a different name) does not,
// because the package must be followed by a subpath separator or the closing quote.
const NATIVE_MODULE =
  /(?:import\s[^'"]*from\s*|export\s[^'"]*from\s*|import\s*\(\s*|require\s*\(\s*|import\s*)['"]@soulcraft\/cor(?:tex)?(?:\/[^'"]*)?['"]/

describe('open/proprietary boundary — public repo must not depend on @soulcraft/cor', () => {
  it('the detector catches every static-dependency form (incl. side-effect imports + re-exports)', () => {
    // Each of these creates a hard dependency on the proprietary package and MUST
    // be caught (the prior regex missed the bare side-effect import and re-export forms).
    for (const form of [
      `import cor from '@soulcraft/cor'`,
      `import { x } from '@soulcraft/cor'`,
      `import '@soulcraft/cor'`,
      `import '@soulcraft/cor/native'`,
      `export { x } from '@soulcraft/cor'`,
      `export * from '@soulcraft/cor'`,
      `const x = require('@soulcraft/cor')`,
      `const x = await import('@soulcraft/cor')`,
      `import x from '@soulcraft/cortex'`
    ]) {
      expect(NATIVE_MODULE.test(form), `should detect: ${form}`).toBe(true)
    }
    // A different package whose name merely starts with the same prefix is NOT a match.
    for (const ok of [`import x from '@soulcraft/core'`, `// see @soulcraft/cor docs`]) {
      expect(NATIVE_MODULE.test(ok), `should NOT match: ${ok}`).toBe(false)
    }
  })

  it('no src/ or tests/ file imports or requires the native package', () => {
    const offenders: string[] = []
    for (const dir of ['src', 'tests']) {
      for (const file of sourceFiles(path.join(repoRoot, dir))) {
        if (NATIVE_MODULE.test(fs.readFileSync(file, 'utf8'))) {
          offenders.push(path.relative(repoRoot, file))
        }
      }
    }
    expect(offenders, `These files statically depend on the proprietary package — use the public plugin API at runtime instead:\n${offenders.join('\n')}`).toEqual([])
  })

  it('the native package is in no dependency field of package.json', () => {
    const pkg = JSON.parse(fs.readFileSync(path.join(repoRoot, 'package.json'), 'utf8'))
    const fields = ['dependencies', 'devDependencies', 'peerDependencies', 'optionalDependencies'] as const
    const present: string[] = []
    for (const field of fields) {
      for (const native of NATIVE_PACKAGES) {
        if (pkg[field] && Object.prototype.hasOwnProperty.call(pkg[field], native)) {
          present.push(`${field}:${native}`)
        }
      }
    }
    expect(present, `The proprietary native package must not be a dependency (public CI must pass with it absent); found in: ${present.join(', ')}`).toEqual([])
  })
})