import { html, stubNetwork } from "../helpers.ts";
import { assert, assertEquals, assertFalse } from "@std/assert";
import { tryFetchRichContent } from "../../services/rich-content-service.ts";

Deno.test("tryFetchRichContent: a preview and the post that follows share one fetch", async () => {
  using net = stubNetwork(() => html(`<title>Once</title>`));
  const first = await tryFetchRichContent("https://example.com/once");
  const second = await tryFetchRichContent("https://example.com/once");
  assertEquals(second, first);
  assertEquals(net.calls.length, 1);
  // A refresh always goes to the page.
  await tryFetchRichContent("https://example.com/once", { fresh: true });
  assertEquals(net.calls.length, 2);
});

Deno.test("tryFetchRichContent: failures aren't kept", async () => {
  let up = false;
  using net = stubNetwork(() => {
    if (!up) throw new TypeError("connection refused");
    return html(`<title>Up</title>`);
  });
  const url = "https://example.com/flaky";
  assertFalse((await tryFetchRichContent(url)).ok);
  up = true;
  const { ok, content } = await tryFetchRichContent(url);
  assert(ok);
  assertEquals(content?.title, "Up");
  assertEquals(net.calls.length, 2);
});

Deno.test("tryFetchRichContent: an unreachable page is ok:false with a stub", async () => {
  using _ = stubNetwork(() => {
    throw new TypeError("connection refused");
  });
  assertEquals(await tryFetchRichContent("https://www.example.com/x"), {
    ok: false,
    content: {
      type: "generic",
      url: "https://www.example.com/x",
      siteName: "example.com",
    },
  });
});

Deno.test("tryFetchRichContent: an error page is unreachable, not a preview", async () => {
  using net = stubNetwork(() => html(`<title>404 Not Found</title>`, 404));
  const url = "https://example.com/gone";
  assertEquals(await tryFetchRichContent(url), {
    ok: false,
    content: { type: "generic", url, siteName: "example.com" },
  });
  // Not kept: the page may be back next time.
  await tryFetchRichContent(url);
  assertEquals(net.calls.length, 2);
});