import { ensureDir, exists, expandGlob, move } from "jsr:@std/fs@1";

await ensureDir("./data/plc/compacted");

export async function createCompactedIndex() {
  if (await exists("./data/plc/compacting"))
    throw new Error("compaction already running!");

  const date = new Date(await Deno.readTextFile("./data/latest-date"));

  await move("./data/plc/live", "./data/plc/compacting");
  await ensureDir("./data/plc/live");

  const inputFiles = await Array.fromAsync(
    expandGlob("./data/plc/compacting/*")
  );
  const process = new Deno.Command("zstd", {
    args: inputFiles.map((it) => `./data/plc/compacting/${it.name}`),
    cwd: Deno.cwd(),
    stdout: "piped",
    stdin: "null",
    stderr: "piped",
  }).spawn();
  await process.status;
  // TODO: run zstd *

  const compactedDir =
    "./data/plc/compacted/" +
    date.toISOString().split("T")[0].replaceAll("-", "");
  await move("./data/plc/compacting", compactedDir);

  await Promise.all(
    inputFiles.map((it) => Deno.remove(`${compactedDir}/${it.name}`))
  );
}

if (import.meta.main) {
  await createCompactedIndex();
}