utils.ts

export function getDeps(text: string) {
  const deps: Array<{
    type: "npm" | "github" | "std" | "unknown"
    url: string
    name: string
    version: string
    emptyVersion: boolean
  }> = []

  const SCOPED_PKG_RE = /^\/(@[^\/]+)\/([^\/]+)/
  const PKG_RE = /^\/([^\/]+)/

  text.replace(/\s+from\s+['"`](.+)['"`]/g, (_, p1) => {
    if (/^https:\/\//.test(p1)) {
      const { hostname, pathname } = new URL("", p1)
      let m: RegExpExecArray | null = null

      if (hostname === "unpkg.com" || hostname === "cdn.pika.dev") {
        if ((m = SCOPED_PKG_RE.exec(pathname))) {
          const version = m[2].split("@")[1]
          deps.push({
            url: p1,
            type: "npm",
            name: m[1] + "/" + m[2].split("@")[0],
            version: version || "latest",
            emptyVersion: !version,
          })
        } else if ((m = PKG_RE.exec(pathname))) {
          const version = m[1].split("@")[1]
          deps.push({
            type: "npm",
            url: p1,
            name: m[1].split("@")[0],
            version: version || "latest",
            emptyVersion: !version,
          })
        } else {
          handlerUnkown(p1)
        }
      } else if (hostname === "deno.land") {
        if ((m = /^\/std(?:@([^\/]+))?/.exec(pathname))) {
          deps.push({
            type: "std",
            url: p1,
            name: "denoland/deno",
            version: m[1] || "master",
            emptyVersion: !m[1],
          })
        } else {
          handlerUnkown(p1)
        }
      } else if (hostname === "denopkg.com") {
        if ((m = /\/([^\/]+)\/([^\/]+)/.exec(pathname))) {
          const version = m[2].split("@")[1]
          deps.push({
            type: "github",
            url: p1,
            name: `${m[1]}/${m[2].split("@")[0]}`,
            version: version || "master",
            emptyVersion: !version,
          })
        }
      } else {
        handlerUnkown(p1)
      }
    }
    return ""
  })

  function handlerUnkown(url: string) {
    deps.push({
      type: "unknown",
      url,
      name: "",
      version: "",
      emptyVersion: true,
    })
  }

  return deps
}

export async function getPkgLatestVersion(name: string) {
  const json = await fetch(`https://registry.npmjs.org/${name}`).then((res) =>
    res.json()
  )

  return json["dist-tags"]["latest"]
}

// https://github.com/substack/semver-compare/blob/master/index.js
export function semverCompare(a: string, b: string) {
  const pa = a.split(".")
  const pb = b.split(".")
  for (let i = 0; i < 3; i++) {
    const na = Number(pa[i])
    const nb = Number(pb[i])
    if (na > nb) return 1
    if (nb > na) return -1
    if (!isNaN(na) && isNaN(nb)) return 1
    if (isNaN(na) && !isNaN(nb)) return -1
  }
  return 0
}

// https://github.com/sindresorhus/semver-regex/blob/master/index.js
const isSemver = (v: string) =>
  /(?<=^v?|\sv?)(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)\.(?:0|[1-9]\d*)(?:-(?:0|[1-9]\d*|[\da-z-]*[a-z-][\da-z-]*)(?:\.(?:0|[1-9]\d*|[\da-z-]*[a-z-][\da-z-]*))*)?(?:\+[\da-z-]+(?:\.[\da-z-]+)*)?(?=$|\s)/gi

export async function getLatestGitTag(repo: string) {
  const json = await fetch(
    `https://api.github.com/repos/${repo}/git/refs/tags`
  ).then((res) => res.json())
  const tags = json
    .map((v: any) => v.ref.replace(/^refs\/tags\/v?/, ""))
    .filter((v: string) => isSemver(v))
  return tags.sort((a: string, b: string) => -semverCompare(a, b))[0]
}

export async function getLatestStdVersion() {
  const text = await fetch(
    `https://denopkg.com/denoland/deno_std@main/version.ts`
  ).then((res) => res.text())

  return text.match(/const VERSION = "(.+)"/)![1]
}