#!/usr/bin/env -S tea -E

/*---
args:
  - deno
  - run
  - --allow-net
  - --allow-read={{ tea.prefix }}/tea.xyz/var/www
  - --allow-env=AWS_ACCESS_KEY_ID,AWS_SECRET_ACCESS_KEY,S3_BUCKET
  - --import-map={{ srcroot }}/import-map.json
---*/

import { S3 } from "s3";
import { crypto } from "deno/crypto/mod.ts";
import useCache from "hooks/useCache.ts";
import { encodeToString } from "encodeToString";
import { readAll, readerFromStreamReader } from "deno/streams/mod.ts";

const s3 = new S3({
  accessKeyID: Deno.env.get("AWS_ACCESS_KEY_ID")!,
  secretKey: Deno.env.get("AWS_SECRET_ACCESS_KEY")!,
  region: "us-east-1",
});

const bucket = s3.getBucket(Deno.env.get("S3_BUCKET")!);

for (const pkg of await useCache().ls()) {
  const key = useCache().s3Key(pkg)
  const bottle = useCache().bottle(pkg)

  console.log({ checking: key });

  const inRepo = await bucket.headObject(key)
  const repoChecksum = inRepo ? await checksum(`https://dist.tea.xyz/${key}.sha256sum`) : undefined

  // path.read() returns a string; this is easier to get a UInt8Array
  const contents = await Deno.readFile(bottle.string);
  const sha256sum = encodeToString(new Uint8Array(await crypto.subtle.digest("SHA-256", contents)))

  if (!inRepo || repoChecksum !== sha256sum) {
    const basename = key.split("/").pop()
    const body = new TextEncoder().encode(`${sha256sum}  ${basename}`)

    console.log({ uploading: key });

    await bucket.putObject(key, contents);
    await bucket.putObject(`${key}.sha256sum`, body);

    console.log({ uploaded: key });
  }
}

async function checksum(url: string) {
  const rsp = await fetch(url)
  if (!rsp.ok) throw new Error(`404-not-found: ${url}`)
  const rdr = rsp.body?.getReader()
  if (!rdr) throw new Error(`Couldn’t read: ${url}`)
  const r = await readAll(readerFromStreamReader(rdr))
  return new TextDecoder().decode(r).split(' ')[0]
}