// @vitest-environment jsdom

import { describe, expect, it } from "vitest";

import {
  normalizeColorSchemePreference,
  resolveColorScheme,
} from "../../src/application/policies/color-scheme.js";
import { initializeColorScheme } from "../../src/bootstrap/initialize-color-scheme.js";

describe("color scheme policy", () => {
  it("normalizes unknown persisted values to the safe system default", () => {
    expect(normalizeColorSchemePreference("sepia")).toBe("system");
    expect(normalizeColorSchemePreference("dark")).toBe("dark");
  });

  it("resolves system and explicit preferences deterministically", () => {
    expect(resolveColorScheme("system", true)).toBe("dark");
    expect(resolveColorScheme("system", false)).toBe("light");
    expect(resolveColorScheme("light", true)).toBe("light");
  });

  it("applies a persisted preference before application paint", () => {
    const result = initializeColorScheme({
      getColorScheme: () => "system",
    }, {
      documentElement: document.documentElement,
      matchMedia: () =>
        /** @type {MediaQueryList} */ ({ matches: true }),
    });

    expect(result).toEqual({ preference: "system", resolved: "dark" });
    expect(document.documentElement).toHaveAttribute("data-theme", "dark");
    expect(document.documentElement).toHaveAttribute(
      "data-theme-preference",
      "system",
    );
    expect(document.documentElement.style.colorScheme).toBe("dark");
  });
});