/**
 * 大文件下载流门禁：路由必须使用统一的背压转换器，不能通过 data 事件
 * 无限制地把源文件推入 Web Stream 队列。
 */

describe('大文件下载流清理与背压', () => {
  const fs = require('fs')
  const path = require('path')
  const downloadRoutes = [
    ['app/api/materials/download/route.ts', 'nodeReadableToWebStream'],
    ['app/api/materials/[id]/skus/[skuId]/download/route.ts', 'createArchiveDownloadStream'],
    ['app/api/materials/[id]/skus/batch-download/route.ts', 'createArchiveDownloadStream'],
    ['app/api/external/download/route.ts', 'createArchiveDownloadStream'],
  ]

  test.each(downloadRoutes)('%s 应使用统一的背压/取消流转换器', (routePath, helperName) => {
    const filePath = path.join(__dirname, '../..', routePath)
    const content = fs.readFileSync(filePath, 'utf-8')

    expect(content).toContain(helperName)
    expect(content).not.toMatch(/(?:fileStream|nodeStream|archive)\.on\(['"]data['"]/)
  })

  test('转换器取消时必须销毁 Node 源流', () => {
    const helperPath = path.join(__dirname, '..', 'node-readable-stream.ts')
    const content = fs.readFileSync(helperPath, 'utf-8')

    expect(content).toMatch(/cancel\([^)]*\)[\s\S]*?source\.destroy\(\)/)
  })
})