import { describe, expect, it } from "vitest";
import { chromeHeight } from "./metrics";

describe("chromeHeight", () => {
  it("is ceil((ascent - descent + lineGap) / upm * size) + 1 from the manifest", () => {
    // Plex: 1025 + 275 = 1300 / 1000 = 1.3 em
    expect(chromeHeight({ face: "IBM Plex Sans", weight: 400, size: 8 })).toBe(Math.ceil(10.4) + 1);
    expect(chromeHeight("footer")).toBe(Math.ceil(9.75) + 1);
    expect(chromeHeight({ face: "IBM Plex Sans", weight: 400, size: 10 })).toBe(14);
  });

  it("covers the line react-pdf draws for render-prop text", () => {
    // A 8 pt Plex line is 10.4 pt tall (verified in the layout tree); the reserve must be at least that.
    expect(chromeHeight({ face: "IBM Plex Sans", weight: 400, size: 8 })).toBeGreaterThanOrEqual(10.4);
  });

  it("falls back across weights and styles instead of failing", () => {
    expect(chromeHeight({ face: "IBM Plex Sans", weight: 600, italic: true, size: 8 })).toBe(12);
  });
});