import { describe, expect, test } from "bun:test";
import { resolveMargin, toPdfOptions } from "./options";

describe("resolveMargin", () => {
  test("defaults to 0.5in on all sides when undefined", () => {
    expect(resolveMargin(undefined)).toEqual({
      top: "0.5in",
      right: "0.5in",
      bottom: "0.5in",
      left: "0.5in",
    });
  });

  test("applies a single string to all sides", () => {
    expect(resolveMargin("2cm")).toEqual({
      top: "2cm",
      right: "2cm",
      bottom: "2cm",
      left: "2cm",
    });
  });

  test("uses per-side values, defaulting missing sides to 0", () => {
    expect(resolveMargin({ top: "1in", left: "0.25in" })).toEqual({
      top: "1in",
      right: "0",
      bottom: "0",
      left: "0.25in",
    });
  });
});

describe("toPdfOptions", () => {
  test("defaults: Letter, 0.5in margins, backgrounds on, preferCSSPageSize", () => {
    expect(toPdfOptions()).toEqual({
      format: "Letter",
      margin: {
        top: "0.5in",
        right: "0.5in",
        bottom: "0.5in",
        left: "0.5in",
      },
      printBackground: true,
      preferCSSPageSize: true,
    });
  });

  test("maps A4 paper size to format", () => {
    expect(toPdfOptions({ paperSize: "A4" }).format).toBe("A4");
  });

  test("respects printBackground: false", () => {
    expect(toPdfOptions({ printBackground: false }).printBackground).toBe(
      false,
    );
  });

  test("passes through a custom margin", () => {
    expect(toPdfOptions({ margin: "0" }).margin).toEqual({
      top: "0",
      right: "0",
      bottom: "0",
      left: "0",
    });
  });

  test("always enables preferCSSPageSize so @page rules win", () => {
    expect(
      toPdfOptions({ paperSize: "A4", margin: "1in" }).preferCSSPageSize,
    ).toBe(true);
  });
});