import test from "node:test";
import assert from "node:assert/strict";
import {
  extractTerminalPreview,
  removeTerminalPreview
} from "../src/_filters/index.js";

test("Terminal previews: extracts rendered Markdown between the leading preview and article headings", () => {
  const renderedPost = `
    <h1 id="terminal-preview">Terminal preview</h1>
    <p>Use the following command:</p>
    <pre class="language-bash"><code class="language-bash">cat /dispatches/example | head -n 5</code></pre>
    <h1 id="investigation">Investigation</h1>
    <p>The public article starts here.</p>
  `;

  assert.equal(
    extractTerminalPreview(renderedPost),
    `\n    <p>Use the following command:</p>\n    <pre class="language-bash"><code class="language-bash">cat /dispatches/example | head -n 5</code></pre>\n    `
  );
  assert.equal(
    removeTerminalPreview(renderedPost),
    `\n    <h1 id="investigation">Investigation</h1>\n    <p>The public article starts here.</p>\n  `
  );
});

test("Terminal previews: ignores missing, misplaced, and malformed preview headings", () => {
  const regularPost = "<h1 id=\"article\">Article</h1><p>Visible text.</p>";
  const misplacedPreview = "<h1 id=\"article\">Article</h1><h1 id=\"terminal-preview\">Terminal preview</h1><p>Do not extract.</p>";

  assert.equal(extractTerminalPreview(regularPost), "");
  assert.equal(removeTerminalPreview(regularPost), regularPost);
  assert.equal(extractTerminalPreview(misplacedPreview), "");
  assert.equal(removeTerminalPreview(misplacedPreview), misplacedPreview);
  assert.equal(extractTerminalPreview(null), "");
  assert.equal(removeTerminalPreview(null), "");
});