import { existsSync, mkdirSync, mkdtempSync, rmSync, symlinkSync, writeFileSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { dirname, join } from 'node:path'
import { afterEach, describe, expect, it } from 'vitest'

import { RepositoryCleaner } from './clean.ts'

const roots: string[] = []

function fixture(): string {
  const root = mkdtempSync(join(tmpdir(), 'dsh-clean-'))
  roots.push(root)
  return root
}

function write(path: string, content = ''): void {
  mkdirSync(dirname(path), { recursive: true })
  writeFileSync(path, content)
}

function addProject(root: string, path: string): void {
  write(join(root, 'tsconfig.json'), JSON.stringify({ files: [], references: [{ path }] }))
  write(join(root, path, 'tsconfig.json'), JSON.stringify({
    compilerOptions: { composite: true, outDir: 'lib/types' },
    include: ['src'],
  }))
  write(join(root, path, 'src/index.ts'), 'export {}\n')
}

afterEach(() => {
  for (const root of roots.splice(0)) rmSync(root, { recursive: true, force: true })
})

describe('RepositoryCleaner', () => {
  it('derives live build outputs from project references and removes safe stale package residue', async () => {
    const root = fixture()
    addProject(root, 'products/shell')
    write(join(root, 'products/shell/lib/types/index.js'))
    write(join(root, 'products/shell/lib/index.js'))
    write(join(root, '.typecheck/legacy.tsbuildinfo'))
    write(join(root, 'root.tsbuildinfo'))
    write(join(root, 'packages/removed/ghost/node_modules/.bin/tool'))

    await new RepositoryCleaner(root).clean()

    expect(existsSync(join(root, 'products/shell/lib'))).toBe(false)
    expect(existsSync(join(root, 'products/shell/src/index.ts'))).toBe(true)
    expect(existsSync(join(root, '.typecheck'))).toBe(false)
    expect(existsSync(join(root, 'root.tsbuildinfo'))).toBe(false)
    expect(existsSync(join(root, 'packages/removed/ghost'))).toBe(false)
  })

  it('does not delete any target when a manifest-less package contains an unknown file', async () => {
    const root = fixture()
    addProject(root, 'products/shell')
    write(join(root, 'products/shell/lib/types/index.js'))
    write(join(root, 'packages/removed/ghost/notes.txt'))

    await expect(new RepositoryCleaner(root).clean()).rejects.toThrow('packages/removed/ghost/notes.txt')
    expect(existsSync(join(root, 'products/shell/lib'))).toBe(true)
  })

  it('refuses project outputs reached through a symlink outside the repository', async () => {
    const root = fixture()
    const externalProject = fixture()
    write(join(root, 'tsconfig.json'), JSON.stringify({ files: [], references: [{ path: './linked' }] }))
    write(join(externalProject, 'tsconfig.json'), JSON.stringify({
      compilerOptions: { composite: true, outDir: 'lib/types' },
      include: ['src'],
    }))
    write(join(externalProject, 'src/index.ts'), 'export {}\n')
    write(join(externalProject, 'lib/types/index.js'))
    symlinkSync(externalProject, join(root, 'linked'), process.platform === 'win32' ? 'junction' : 'dir')

    await expect(new RepositoryCleaner(root).clean()).rejects.toThrow('outside repository')

    expect(existsSync(join(externalProject, 'lib/types/index.js'))).toBe(true)
  })
})
