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

import { buildSiteThemeStyleText, buildSiteThemeTokens } from "@/lib/site-theme";

const CHANNEL = /^\d+ \d+% \d+%$/;

describe("buildSiteThemeTokens", () => {
  it("converts pure red to the expected HSL channels", () => {
    const tokens = buildSiteThemeTokens("#ff0000");
    expect(tokens.light.primary).toBe("0 100% 50%");
    // dark primary lightens by 6 and clamps saturation into [40,95]
    expect(tokens.dark.primary).toBe("0 95% 56%");
  });

  it("produces zero saturation for a neutral gray", () => {
    const tokens = buildSiteThemeTokens("#808080");
    expect(tokens.light.primary.startsWith("0 0%")).toBe(true);
  });

  it("emits well-formed channel strings for every token", () => {
    const tokens = buildSiteThemeTokens("#dc5a35");
    for (const value of [
      tokens.light.primary,
      tokens.light.secondary,
      tokens.dark.primary,
      tokens.dark.secondary,
    ]) {
      expect(value).toMatch(CHANNEL);
    }
  });

  it("derives distinct dark and secondary variants", () => {
    const tokens = buildSiteThemeTokens("#dc5a35");
    expect(tokens.dark.primary).not.toBe(tokens.light.primary);
    expect(tokens.light.secondary).not.toBe(tokens.light.primary);
  });

  it("falls back to the default brand color for invalid input", () => {
    expect(buildSiteThemeTokens("not-a-color")).toEqual(buildSiteThemeTokens("#dc5a35"));
    expect(buildSiteThemeTokens("")).toEqual(buildSiteThemeTokens("#dc5a35"));
  });
});

describe("buildSiteThemeStyleText", () => {
  it("emits :root and .dark blocks with the derived channels", () => {
    const css = buildSiteThemeStyleText("#ff0000");
    expect(css).toContain(":root {");
    expect(css).toContain(".dark {");
    expect(css).toContain("--primary: 0 100% 50%;");
    expect(css).toContain("--brand-secondary:");
    expect(css).toContain("--sidebar-ring:");
  });
});