import { TEST_DIR } from "../setup.ts";
import { assertEquals } from "@std/assert";
import { sweepGeneratedMedia } from "../../lib/ffmpeg.ts";

const UPLOADS = `${TEST_DIR}/uploads`;

async function write(path: string, ageMs = 0): Promise<void> {
  const full = `${UPLOADS}/${path}`;
  await Deno.mkdir(full.slice(0, full.lastIndexOf("/")), { recursive: true });
  await Deno.writeTextFile(full, "x");
  if (ageMs > 0) {
    const at = new Date(Date.now() - ageMs);
    await Deno.utime(full, at, at);
  }
}

const exists = (path: string) =>
  Deno.stat(`${UPLOADS}/${path}`).then(() => true, () => false);

Deno.test("sweepGeneratedMedia: takes the copies of gone uploads, the old previews and abandoned temporary files", async () => {
  const HOURS = 60 * 60_000;
  const kept = [
    // An upload and its copies, in each format.
    "avatars/u1",
    "scaled/avatars/u1.w128.webp",
    "scaled/avatars/u1.w640.png",
    // A custom thumbnail is an upload; a still and a waveform go with their
    // dump, not here.
    "thumbnails/d1-custom",
    "scaled/thumbnails/d1-custom.w960.webp",
    "thumbnails/d1.jpg",
    "thumbnails/d1.waveform.json",
    // Being written right now.
    "scaled/avatars/u1.w320.webp.1234.tmp",
    "scaled/tmp/fresh",
    "thumbnails/d1.jpg.1234.tmp",
  ];
  const swept = [
    // Their upload is gone.
    "scaled/avatars/u2.w128.webp",
    "scaled/dumps/d2.w960.jpg",
    // The name the previews of image dumps had.
    "thumbnails/d1.preview.jpg",
    "thumbnails/d3.preview.png",
  ];
  const abandoned = [
    "scaled/avatars/u1.w960.webp.5678.tmp",
    "scaled/tmp/stale",
    "scaled/tmp/stale.webp",
    "thumbnails/d1.waveform.json.5678.tmp",
  ];
  for (const path of [...kept, ...swept]) await write(path);
  for (const path of abandoned) await write(path, 2 * HOURS);

  assertEquals(await sweepGeneratedMedia(), swept.length + abandoned.length);
  for (const path of kept) assertEquals(await exists(path), true, path);
  for (const path of [...swept, ...abandoned]) {
    assertEquals(await exists(path), false, path);
  }
  // Nothing left to take.
  assertEquals(await sweepGeneratedMedia(), 0);
});