import { describe, expect, test } from "bun:test";
import { existsSync } from "node:fs";
import { chromium } from "playwright-core";
import { buildPrintCss } from "./print-css";
import { PDFRenderer } from "./renderer";

// Real end-to-end render. Runs ONLY when a Chromium binary is already present
// (e.g. a prior `playwright install chromium`). It never downloads a browser or
// hits the network, so CI without a browser simply skips it.
function chromiumAvailable(): boolean {
  try {
    const path = chromium.executablePath();
    return typeof path === "string" && path.length > 0 && existsSync(path);
  } catch {
    return false;
  }
}

const available = chromiumAvailable();

describe("PDFRenderer smoke render", () => {
  test.skipIf(!available)(
    "renders a valid PDF from HTML using the local runtime",
    async () => {
      const html = `<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <style>${buildPrintCss({ paperSize: "Letter" })}</style>
  </head>
  <body>
    <h1>OPL-2601 smoke</h1>
    <p>Shared HTML to PDF pipeline.</p>
    <div class="break-before">Second page content.</div>
  </body>
</html>`;

      // Pin the local runtime so an autodetect can't pick serverless in a
      // CI/Lambda-like environment.
      const renderer = new PDFRenderer({ runtime: "local" });
      const bytes = await renderer.render(html, {
        paperSize: "Letter",
        printBackground: true,
      });

      expect(bytes).toBeInstanceOf(Uint8Array);
      expect(bytes.byteLength).toBeGreaterThan(1000);
      // PDF magic header: "%PDF-"
      const header = new TextDecoder().decode(bytes.slice(0, 5));
      expect(header).toBe("%PDF-");
    },
    60_000,
  );

  test.skipIf(!available)(
    "blocks remote subresources and disables JS without hanging",
    async () => {
      // Untrusted HTML with a remote image, remote stylesheet, and an inline
      // script. With JS disabled and only data:/blob: allowed, every external
      // request must be aborted — the render completes promptly instead of
      // hanging on network that will never resolve.
      const html = `<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <link rel="stylesheet" href="https://example.com/evil.css" />
    <style>${buildPrintCss()}</style>
  </head>
  <body>
    <h1>isolation</h1>
    <img src="https://example.com/exfil.png?secret=1" alt="" />
    <script>document.title = "js-ran";</script>
  </body>
</html>`;

      const renderer = new PDFRenderer({ runtime: "local" });
      const bytes = await renderer.render(html);

      expect(new TextDecoder().decode(bytes.slice(0, 5))).toBe("%PDF-");
      expect(bytes.byteLength).toBeGreaterThan(1000);
    },
    30_000,
  );
});