import { describe, expect, test } from "bun:test";
import {
  DEFAULT_ACCENT_HUE,
  deriveContrastingForeground,
  getTeamAccentCssVariables,
  getTeamAccentHue,
  normalizeAccentHue,
  parseAccentHue,
} from "./team-theme";

describe("accent hue parsing", () => {
  test("normalizes equivalent hues", () => {
    expect(normalizeAccentHue(360)).toBe(0);
    expect(normalizeAccentHue(-15)).toBe(345);
    expect(normalizeAccentHue(725)).toBe(5);
  });

  test("treats missing or invalid persisted hues as unset", () => {
    expect(parseAccentHue(null)).toBeNull();
    expect(parseAccentHue("")).toBeNull();
    expect(parseAccentHue("not-a-color")).toBeNull();
    expect(parseAccentHue("361")).toBeNull();
  });
});

describe("team accent CSS variables", () => {
  test("sets the existing accent hue and theme-specific foregrounds", () => {
    expect(getTeamAccentCssVariables(195)).toEqual({
      "--accent-hue": "195",
      "--team-primary-foreground-light": "oklch(0.1 0 0)",
      "--team-primary-foreground-dark": "oklch(0.1 0 0)",
    });
  });

  test("chooses the higher-contrast neutral foreground", () => {
    expect(
      deriveContrastingForeground({ lightness: 0.2, chroma: 0, hue: 0 }),
    ).toBe("oklch(0.98 0 0)");
    expect(
      deriveContrastingForeground({ lightness: 0.8, chroma: 0, hue: 0 }),
    ).toBe("oklch(0.1 0 0)");
  });
});

describe("team color -> accent hue", () => {
  test("extracts the hue from a numeric oklch color", () => {
    expect(getTeamAccentHue("oklch(0.6 0.15 210)")).toBe(210);
    expect(getTeamAccentHue("oklch(0.55 0.12 34)")).toBe(34);
    // Out-of-range hue is normalized onto the 0..360 circle.
    expect(getTeamAccentHue("oklch(0.6 0.15 380)")).toBe(20);
  });

  test("derives a hue from hex colors on the same OKLab circle", () => {
    const red = getTeamAccentHue("#ff0000");
    const green = getTeamAccentHue("#00ff00");
    const blue = getTeamAccentHue("#0000ff");
    expect(red).toBeGreaterThan(20);
    expect(red).toBeLessThan(40);
    expect(green).toBeGreaterThan(135);
    expect(green).toBeLessThan(150);
    expect(blue).toBeGreaterThan(255);
    expect(blue).toBeLessThan(272);
  });

  test("treats shorthand hex the same as full hex", () => {
    expect(getTeamAccentHue("#f00")).toBeCloseTo(
      getTeamAccentHue("#ff0000"),
      5,
    );
  });

  test("falls back to the default hue for achromatic or invalid input", () => {
    expect(getTeamAccentHue("#808080")).toBe(DEFAULT_ACCENT_HUE);
    expect(getTeamAccentHue("#000000")).toBe(DEFAULT_ACCENT_HUE);
    expect(getTeamAccentHue("#ffffff")).toBe(DEFAULT_ACCENT_HUE);
    expect(getTeamAccentHue("not-a-color")).toBe(DEFAULT_ACCENT_HUE);
    expect(getTeamAccentHue(null)).toBe(DEFAULT_ACCENT_HUE);
    expect(getTeamAccentHue(undefined)).toBe(DEFAULT_ACCENT_HUE);
  });
});