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

import {
  buildDefaultMarqueeSettings,
  parseMarqueeSettingsValue,
  splitMarqueeRowItems,
  syncMarqueeSettingsToGermanSource,
} from "@/lib/marquee-settings";

describe("buildDefaultMarqueeSettings", () => {
  it("provides all four rows for every locale", () => {
    const settings = buildDefaultMarqueeSettings();
    for (const locale of ["ar", "en", "de"] as const) {
      expect(settings.locales[locale].row1).toContain("Next.js");
      expect(settings.locales[locale].row2).toContain("TypeScript");
      expect(settings.locales[locale].row3).toContain("JavaScript");
      expect(settings.locales[locale].row4).toContain("Frontend Strategy");
    }
  });
});

describe("syncMarqueeSettingsToGermanSource", () => {
  it("copies the german rows over english and arabic", () => {
    const base = buildDefaultMarqueeSettings();
    base.locales.de.row1 = "GERMAN";
    base.locales.en.row1 = "english";
    base.locales.ar.row1 = "arabic";
    const synced = syncMarqueeSettingsToGermanSource(base);
    expect(synced.locales.de.row1).toBe("GERMAN");
    expect(synced.locales.en.row1).toBe("GERMAN");
    expect(synced.locales.ar.row1).toBe("GERMAN");
  });

  it("returns independent copies (no shared references)", () => {
    const synced = syncMarqueeSettingsToGermanSource(buildDefaultMarqueeSettings());
    synced.locales.en.row1 = "changed";
    expect(synced.locales.de.row1).not.toBe("changed");
  });
});

describe("parseMarqueeSettingsValue", () => {
  it("returns german-synced defaults for empty input", () => {
    const settings = parseMarqueeSettingsValue(null);
    expect(settings.locales.en.row1).toBe(settings.locales.de.row1);
    expect(settings.locales.de.row1).toContain("Next.js");
  });

  it("returns defaults for invalid json", () => {
    const settings = parseMarqueeSettingsValue("{not json");
    expect(settings.locales.de.row1).toContain("Next.js");
  });

  it("normalizes stored values, trims, and syncs to german", () => {
    const settings = parseMarqueeSettingsValue(
      JSON.stringify({
        locales: {
          de: { row1: "  Custom Row 1  ", row2: "R2", row3: "R3", row4: "R4" },
          en: { row1: "IGNORED" },
        },
      }),
    );
    expect(settings.locales.de.row1).toBe("Custom Row 1");
    // english is overwritten by the german source
    expect(settings.locales.en.row1).toBe("Custom Row 1");
    expect(settings.locales.ar.row2).toBe("R2");
  });

  it("falls back to per-row defaults when a row is blank", () => {
    const settings = parseMarqueeSettingsValue(
      JSON.stringify({ locales: { de: { row1: "   ", row2: "", row3: "R3", row4: "R4" } } }),
    );
    expect(settings.locales.de.row1).toContain("Next.js");
    expect(settings.locales.de.row3).toBe("R3");
  });
});

describe("splitMarqueeRowItems", () => {
  it("splits on newlines and commas and trims blanks", () => {
    expect(splitMarqueeRowItems("A\nB, C\n\n , D")).toEqual(["A", "B", "C", "D"]);
  });

  it("returns an empty array for whitespace-only input", () => {
    expect(splitMarqueeRowItems("   \n  ")).toEqual([]);
  });
});