import { readdirSync, readFileSync } from 'node:fs'
import { relative, resolve } from 'node:path'
import { describe, expect, it } from 'vitest'

const sourceRoot = resolve(process.cwd(), 'src')

function sourceFiles(directory: string): string[] {
  return readdirSync(directory, { withFileTypes: true }).flatMap((entry) => {
    const path = resolve(directory, entry.name)
    if (entry.isDirectory()) return sourceFiles(path)
    return /\.(ts|vue)$/.test(entry.name) ? [path] : []
  })
}

function aliasImports(path: string): string[] {
  const source = readFileSync(path, 'utf8')
  return [...source.matchAll(/['"](@\/[^'"]+)['"]/g)].map((match) => match[1])
}

describe('source dependency boundaries', () => {
  it('keeps app, core, modules and shared dependencies pointing inward', () => {
    const violations: string[] = []

    for (const path of sourceFiles(sourceRoot)) {
      const sourcePath = relative(sourceRoot, path).replaceAll('\\', '/')
      const sourceModule = sourcePath.match(/^modules\/([^/]+)\//)?.[1]

      for (const dependency of aliasImports(path)) {
        if (sourcePath.startsWith('shared/') && /^@\/(app|core|modules|prototype)\//.test(dependency)) {
          violations.push(`${sourcePath} -> ${dependency}`)
        }
        if (sourcePath.startsWith('core/') && /^@\/(app|modules|prototype)\//.test(dependency)) {
          violations.push(`${sourcePath} -> ${dependency}`)
        }
        if (sourceModule && /^@\/(app|prototype)\//.test(dependency)) {
          violations.push(`${sourcePath} -> ${dependency}`)
        }

        const targetModule = dependency.match(/^@\/modules\/([^/]+)(\/.*)?$/)
        if (sourceModule && targetModule && targetModule[1] !== sourceModule && targetModule[2]) {
          violations.push(`${sourcePath} -> ${dependency}`)
        }
      }
    }

    expect(violations).toEqual([])
  })
})