import { expect, test } from "bun:test";
import { shouldInlineCss } from "../src/inline-css.ts";

test("production CSS inlining uses a configurable UTF-8 byte budget", () => {
  expect(shouldInlineCss("x".repeat(4096), undefined)).toBe(true);
  expect(shouldInlineCss("x".repeat(4097), undefined)).toBe(false);
  expect(shouldInlineCss("x".repeat(5000), 6000)).toBe(true);
  expect(shouldInlineCss("é".repeat(10), 10)).toBe(false);
  expect(shouldInlineCss("", 0)).toBe(false);
  for (const value of [-1, NaN, Infinity, 1.5]) expect(() => shouldInlineCss("", value)).toThrow();
});

test("relative asset URLs stay external so their base does not change", () => {
  for (const url of ["./font.woff2", "../font.woff2", "font.woff2", "#mask"]) {
    expect(shouldInlineCss(`a{background:url("${url}")}`, undefined)).toBe(false);
  }
  for (const url of [
    "/font.woff2",
    "https://cdn.example/font.woff2",
    "data:image/svg+xml;base64,AAAA",
  ]) {
    expect(shouldInlineCss(`a{background:url('${url}')}`, undefined)).toBe(true);
  }
});