import { describe, expect, test } from "bun:test";
import {
  buildMarkdownExportFileName,
  normalizeMarkdownImageUrls,
} from "./markdown-export";

describe("normalizeMarkdownImageUrls", () => {
  test("converts /public/assets image links to absolute URLs", () => {
    const markdown = "![cover](/public/assets/posts/cover.png)";
    const result = normalizeMarkdownImageUrls(markdown, "https://example.com");

    expect(result).toBe("![cover](https://example.com/public/assets/posts/cover.png)");
  });

  test("keeps absolute http/https image links unchanged", () => {
    const markdown = [
      "![a](http://cdn.example.com/a.png)",
      "![b](https://cdn.example.com/b.png)",
    ].join("\n");

    const result = normalizeMarkdownImageUrls(markdown, "https://example.com");

    expect(result).toBe(markdown);
  });

  test("keeps protocol-relative and data URI image links unchanged", () => {
    const markdown = [
      "![protocol](//cdn.example.com/p.png)",
      "![inline](data:image/png;base64,AAAB)",
    ].join("\n");

    const result = normalizeMarkdownImageUrls(markdown, "https://example.com");

    expect(result).toBe(markdown);
  });

  test("does not change normal markdown links", () => {
    const markdown = "[read more](/public/assets/posts/cover.png)";
    const result = normalizeMarkdownImageUrls(markdown, "https://example.com");

    expect(result).toBe(markdown);
  });
});

describe("buildMarkdownExportFileName", () => {
  test("prefers slug when slug is not empty", () => {
    const result = buildMarkdownExportFileName({ slug: "hello-world", id: 42 });

    expect(result).toBe("hello-world.md");
  });

  test("falls back to post-<id>.md when slug is empty", () => {
    const result = buildMarkdownExportFileName({ slug: "", id: 42 });

    expect(result).toBe("post-42.md");
  });
});