import { get, PNG, stubNetwork } from "../helpers.ts";
import { assertEquals } from "@std/assert";

Deno.test("GET /api/proxy-image: rasters only, fetched once for everyone", async () => {
  using net = stubNetwork((url) =>
    url.pathname.endsWith(".svg")
      ? new Response("<svg/>", { headers: { "content-type": "image/svg+xml" } })
      : new Response(PNG, { headers: { "content-type": "image/png" } })
  );
  const path = `/api/proxy-image?url=${
    encodeURIComponent("https://cdn.example.com/a.png")
  }`;
  const first = await get(path);
  assertEquals(first.status, 200);
  assertEquals(first.headers.get("content-type"), "image/png");
  assertEquals(first.bytes, PNG);
  const second = await get(path);
  assertEquals(second.bytes, PNG);
  assertEquals(net.calls.length, 1);

  const svg = await get(
    `/api/proxy-image?url=${
      encodeURIComponent("https://cdn.example.com/a.svg")
    }`,
  );
  assertEquals(svg.status, 400);
});

Deno.test("GET /api/proxy-image: an error answer is never served nor cached", async () => {
  let failing = true;
  using net = stubNetwork(() =>
    failing
      ? new Response(PNG, {
        status: 503,
        headers: { "content-type": "image/png" },
      })
      : new Response(PNG, { headers: { "content-type": "image/png" } })
  );
  const path = `/api/proxy-image?url=${
    encodeURIComponent("https://cdn.example.com/flaky.png")
  }`;
  assertEquals((await get(path)).status, 400);
  failing = false;
  assertEquals((await get(path)).status, 200);
  assertEquals(net.calls.length, 2);
});