import { describe, expect, test } from "bun:test";
import { buildPrintCss, PRINT_BASE_CSS } from "./print-css";

describe("PRINT_BASE_CSS", () => {
  test("preserves background colors via print-color-adjust", () => {
    expect(PRINT_BASE_CSS).toContain("-webkit-print-color-adjust: exact");
    expect(PRINT_BASE_CSS).toContain("print-color-adjust: exact");
  });

  test("sets orphans/widows defaults for editorial pagination", () => {
    expect(PRINT_BASE_CSS).toContain("orphans: 3");
    expect(PRINT_BASE_CSS).toContain("widows: 3");
  });

  test("exposes page-break utility classes", () => {
    expect(PRINT_BASE_CSS).toContain(".break-before");
    expect(PRINT_BASE_CSS).toContain("break-before: page");
    expect(PRINT_BASE_CSS).toContain(".break-after");
    expect(PRINT_BASE_CSS).toContain("break-after: page");
    expect(PRINT_BASE_CSS).toContain(".break-inside-avoid");
    expect(PRINT_BASE_CSS).toContain("break-inside: avoid");
  });

  test("keeps headings attached to following content", () => {
    expect(PRINT_BASE_CSS).toContain("break-after: avoid");
  });

  test("is size-agnostic (no @page rule)", () => {
    expect(PRINT_BASE_CSS).not.toContain("@page");
  });
});

describe("buildPrintCss", () => {
  test("defaults to Letter with 0.5in margins", () => {
    const css = buildPrintCss();
    expect(css).toContain("@page");
    expect(css).toContain("size: letter");
    expect(css).toContain("margin: 0.5in");
    // base rules are appended
    expect(css).toContain("print-color-adjust: exact");
  });

  test("maps A4 paper size", () => {
    const css = buildPrintCss({ paperSize: "A4" });
    expect(css).toContain("size: A4");
  });

  test("accepts a single string margin for all sides", () => {
    const css = buildPrintCss({ margin: "1cm" });
    expect(css).toContain("margin: 1cm");
  });

  test("expands per-side margins, defaulting missing sides to 0", () => {
    const css = buildPrintCss({ margin: { top: "1in", bottom: "0.75in" } });
    expect(css).toContain("margin: 1in 0 0.75in 0");
  });
});