const test = require("node:test");
const assert = require("node:assert/strict");
const { Readable } = require("node:stream");
const {
  collectMarkdownLinksFromStream,
  extractLinksFromText,
  sanitizeUrlCandidate,
} = require("../lib/markdown_links");

test("extractLinksFromText returns sanitized external URLs only once", () => {
  const input =
    "See [example](https://example.com) and <https://foo.com>. " +
    "Autolink https://bar.com/path).\nDuplicate https://example.com!";
  const urls = extractLinksFromText(input);
  assert.deepStrictEqual(urls, ["https://example.com", "https://foo.com", "https://bar.com/path"]);
});

test("collectMarkdownLinksFromStream preserves line numbers", async () => {
  const content = [
    "Intro line with no link",
    "Markdown [link](https://docs.example.org/page).",
    "Plain link https://news.example.net/article.",
    "Trailing <https://portal.example.com/path> punctuation.",
    "Markdown [link](https://docs.example.org/page(with more valid content)).",
    "Le **[baume du Canada](https://fr.wikipedia.org/wiki/Baume_du_Canada)**",
    "(_Theropoda [incertae sedis](https://fr.wikipedia.org/wiki/Incertae_sedis)_)",
    "[CDN](https://fr.wikipedia.org/wiki/Réseau_de_diffusion_de_contenu)[^2]."
  ].join("\n");
  const stream = Readable.from([content]);
  const links = await collectMarkdownLinksFromStream(stream);
  assert.deepStrictEqual(links, [
    { url: "https://docs.example.org/page", line: 2 },
    { url: "https://news.example.net/article", line: 3 },
    { url: "https://portal.example.com/path", line: 4 },
    { url: "https://docs.example.org/page(with more valid content)", line: 5 },
    { url: "https://fr.wikipedia.org/wiki/Baume_du_Canada", line: 6 },
    { url: "https://fr.wikipedia.org/wiki/Incertae_sedis", line: 7 },
    { url: "https://fr.wikipedia.org/wiki/Réseau_de_diffusion_de_contenu", line: 8 },
  ]);
});

test("collectMarkdownLinksFromStream ignores URLs in front matter comments", async () => {
  const content = [
    "---",
    "links:",
    "  # url: https://ignored.example.com",
    "  - url: https://included.example.com",
    "---",
    "Body with https://body.example.com link.",
  ].join("\n");
  const stream = Readable.from([content]);
  const links = await collectMarkdownLinksFromStream(stream);
  assert.deepStrictEqual(links, [
    { url: "https://included.example.com", line: 4 },
    { url: "https://body.example.com", line: 6 },
  ]);
});

test("sanitizeUrlCandidate removes spurious trailing punctuation", () => {
  const cases = [
    ["https://example.com).", "https://example.com"],
    ["https://example.com!\"", "https://example.com"],
    ["<https://example.com>", "https://example.com"],
  ];
  for (const [input, expected] of cases) {
    assert.equal(sanitizeUrlCandidate(input), expected);
  }
});