import {
  createUser,
  db,
  del,
  get,
  hasFfmpeg,
  insertDump,
  makeImage,
  PNG,
  test,
  TEST_DIR,
  webpWidth,
} from "../helpers.ts";
import { assertEquals } from "@std/assert";

function createdAtOf(id: string): string {
  return (db.prepare(`SELECT created_at FROM dumps WHERE id = ?;`).get(id) as {
    created_at: string;
  }).created_at;
}

function readDir(path: string): string[] {
  try {
    return [...Deno.readDirSync(path)].map((e) => e.name);
  } catch {
    return [];
  }
}

test("GET /api/dumps/:id/thumbnail: serves a cached video still, with privacy", async () => {
  const owner = await createUser();
  const video = insertDump({
    userId: owner.id,
    fileName: "v.mp4",
    fileMime: "video/mp4",
  });
  const priv = insertDump({
    userId: owner.id,
    fileName: "p.mp4",
    fileMime: "video/mp4",
    isPrivate: true,
  });
  Deno.mkdirSync(`${TEST_DIR}/uploads/thumbnails`, { recursive: true });
  for (const { id } of [video, priv]) {
    Deno.writeFileSync(`${TEST_DIR}/uploads/thumbnails/${id}.jpg`, PNG);
  }
  const res = await get(`/api/dumps/${video.id}/thumbnail`);
  assertEquals(res.status, 200);
  assertEquals(res.headers.get("content-type"), "image/jpeg");
  assertEquals(res.headers.get("cache-control"), "public, no-cache");
  const v = (id: string) => `5-${Date.parse(createdAtOf(id))}`;
  assertEquals(
    (await get(`/api/dumps/${video.id}/thumbnail?v=${v(video.id)}`)).headers
      .get(
        "cache-control",
      ),
    "public, max-age=31536000, immutable",
  );
  assertEquals((await get(`/api/dumps/${priv.id}/thumbnail`)).status, 404);
  const own = await get(
    `/api/dumps/${priv.id}/thumbnail?v=${v(priv.id)}&token=${owner.mediaToken}`,
  );
  assertEquals(own.status, 200);
  assertEquals(
    own.headers.get("cache-control"),
    "private, max-age=31536000, immutable",
  );

  const text = insertDump({ userId: owner.id, fileName: "t.txt" });
  assertEquals((await get(`/api/dumps/${text.id}/thumbnail`)).status, 404);
  assertEquals((await get(`/api/dumps/nope/thumbnail`)).status, 400);
});

test("GET /api/dumps/:id/thumbnail: an image dump gets a scaled copy, or itself when none can be made", async () => {
  const owner = await createUser();
  const scaled = (id: string) =>
    readDir(`${TEST_DIR}/uploads/scaled/dumps`).filter((n) => n.startsWith(id))
      .sort();

  // Not an image ffmpeg can read (or no ffmpeg at all): the original goes out.
  const gif = new TextEncoder().encode("GIF89a-not-really");
  const broken = insertDump({
    userId: owner.id,
    fileName: "a.gif",
    fileMime: "image/gif",
    fileData: gif,
  });
  const fallback = await get(`/api/dumps/${broken.id}/thumbnail`);
  assertEquals(fallback.status, 200);
  assertEquals(fallback.headers.get("content-type"), "image/gif");
  assertEquals(fallback.bytes, gif);
  assertEquals(scaled(broken.id), []);

  if (!await hasFfmpeg()) {
    const photo = insertDump({
      userId: owner.id,
      fileName: "p.png",
      fileMime: "image/png",
      fileData: PNG,
    });
    const itself = await get(`/api/dumps/${photo.id}/thumbnail`);
    assertEquals(itself.headers.get("content-type"), "image/png");
    assertEquals(itself.bytes, PNG);
    return;
  }

  // A real image is scaled to the widest width without `w`, and to the width
  // asked for with it, each copy kept under the upload's own path.
  const photo = insertDump({
    userId: owner.id,
    fileName: "p.png",
    fileMime: "image/png",
    fileData: await makeImage(1400, 300),
  });
  const widest = await get(`/api/dumps/${photo.id}/thumbnail`);
  assertEquals(widest.status, 200);
  assertEquals(widest.headers.get("content-type"), "image/webp");
  assertEquals(webpWidth(widest.bytes), 960);
  const small = await get(`/api/dumps/${photo.id}/thumbnail?w=128`);
  assertEquals(small.headers.get("content-type"), "image/webp");
  assertEquals(webpWidth(small.bytes), 128);
  // A width between two of the list's takes the one above.
  const between = await get(`/api/dumps/${photo.id}/thumbnail?w=200`);
  assertEquals(webpWidth(between.bytes), 320);
  assertEquals(scaled(photo.id), [
    `${photo.id}.w128.webp`,
    `${photo.id}.w320.webp`,
    `${photo.id}.w960.webp`,
  ]);

  // A reader without WebP, as a mail client, asks for a PNG or a JPEG.
  const compat = await get(`/api/dumps/${photo.id}/thumbnail?w=640&f=compat`);
  assertEquals(compat.status, 200);
  assertEquals(compat.headers.get("content-type"), "image/png");
  // Its header states the width, on four bytes from the sixteenth.
  assertEquals(new DataView(compat.bytes.buffer).getUint32(16), 640);
  assertEquals(scaled(photo.id).includes(`${photo.id}.w640.png`), true);

  // An animation keeps its frames.
  const animated = insertDump({
    userId: owner.id,
    fileName: "anim.gif",
    fileMime: "image/gif",
    fileData: await makeImage(400, 300, "blue", "gif"),
  });
  const moving = await get(`/api/dumps/${animated.id}/thumbnail?w=128`);
  assertEquals(moving.headers.get("content-type"), "image/webp");
  assertEquals(webpWidth(moving.bytes), 128);
  assertEquals(new TextDecoder().decode(moving.bytes).includes("ANMF"), true);

  // The copies go with the dump.
  assertEquals(
    (await del(`/api/dumps/${photo.id}`, { auth: owner.auth })).status,
    200,
  );
  assertEquals(scaled(photo.id), []);
});