import assert from "node:assert/strict"
import { readFile, readdir } from "node:fs/promises"
import path from "node:path"
import { fileURLToPath } from "node:url"

const projectDir = fileURLToPath(new URL("../", import.meta.url))
const appDir = path.join(projectDir, ".next/server/app")
const outDir = path.join(projectDir, "out")
const categories = JSON.parse(
  await readFile(path.join(projectDir, "src/data/categories.json"), "utf8"),
)
const routes = ["/", ...categories.map(({ id }) => `/categories/${id}`)]
let checkedSegments = 0

// 只读构建产物：验证浏览器需要的扁平 URL，绝不修补或复制 out/ 文件。
for (const route of routes) {
  const routeDir = path.join(outDir, route)
  assert((await readFile(path.join(routeDir, "index.html"))).length > 0)
  assert((await readFile(path.join(routeDir, "index.txt"))).length > 0)

  const segmentsDir = path.join(
    appDir,
    `${route === "/" ? "index" : route}.segments`,
  )
  const files = (await readdir(segmentsDir, { recursive: true })).filter(
    (file) => file.endsWith(".segment.rsc"),
  )
  assert(files.length > 0, `${route} 缺少 RSC segment 构建产物`)

  for (const file of files) {
    const segment = file
      .replaceAll("\\", "/")
      .slice(0, -".segment.rsc".length)
      .replaceAll("/", ".")
    const filename = `__next.${segment}.txt`
    const source = await readFile(path.join(segmentsDir, file))
    const exported = await readFile(path.join(routeDir, filename))
    assert.deepEqual(exported, source, `${route}/${filename} 内容不一致`)
    checkedSegments += 1
  }
}

assert((await readFile(path.join(outDir, "404.html"))).length > 0)
console.log(
  `静态导出检查通过：${routes.length} 个页面、${checkedSegments} 个 RSC 文件及 404.html。`,
)