import { describe, it, expect } from "vitest";
import { suggestUsername, safeRedirectTo } from "../onboarding";
import { USERNAME_RE } from "~/models/user";

describe("suggestUsername", () => {
  it("returns empty string for null", () => {
    expect(suggestUsername(null)).toBe("");
  });

  it("returns empty string for empty string", () => {
    expect(suggestUsername("")).toBe("");
  });

  it("lowercases and strips spaces", () => {
    expect(suggestUsername("John Smith")).toBe("johnsmith");
  });

  it("strips special characters", () => {
    expect(suggestUsername("Jane O'Brien!")).toBe("janeobrien");
  });

  it("preserves underscores and hyphens", () => {
    expect(suggestUsername("cool_user-name")).toBe("cool_user-name");
  });

  it("slices to 20 characters", () => {
    expect(suggestUsername("averylongdisplaynamethatexceedstwenty")).toBe("averylongdisplayname");
    expect(suggestUsername("averylongdisplaynamethatexceedstwenty").length).toBeLessThanOrEqual(20);
  });

  it("returns empty string when cleaned result is shorter than 3 characters", () => {
    expect(suggestUsername("Jo")).toBe("");
    expect(suggestUsername("AB")).toBe("");
  });

  it("returns the suggestion when cleaned result is exactly 3 characters", () => {
    expect(suggestUsername("abc")).toBe("abc");
  });

  it("returns empty string for non-ASCII display names that strip to nothing", () => {
    expect(suggestUsername("小林")).toBe("");
  });
});

describe("safeRedirectTo", () => {
  it("returns / for null", () => {
    expect(safeRedirectTo(null)).toBe("/");
  });

  it("returns / for empty string", () => {
    expect(safeRedirectTo("")).toBe("/");
  });

  it("returns / for bare slash", () => {
    expect(safeRedirectTo("/")).toBe("/");
  });

  it("allows a root-relative path", () => {
    expect(safeRedirectTo("/leagues/123/draft/456")).toBe("/leagues/123/draft/456");
  });

  it("rejects an absolute URL", () => {
    expect(safeRedirectTo("https://evil.com")).toBe("/");
  });

  it("rejects a protocol-relative URL", () => {
    expect(safeRedirectTo("//evil.com")).toBe("/");
  });
});

describe("USERNAME_RE", () => {
  it("allows 3-character usernames", () => {
    expect(USERNAME_RE.test("abc")).toBe(true);
  });

  it("allows 30-character usernames", () => {
    expect(USERNAME_RE.test("a".repeat(30))).toBe(true);
  });

  it("allows letters, numbers, underscores, and hyphens", () => {
    expect(USERNAME_RE.test("Cool_User-123")).toBe(true);
  });

  it("rejects usernames shorter than 3 characters", () => {
    expect(USERNAME_RE.test("ab")).toBe(false);
    expect(USERNAME_RE.test("")).toBe(false);
  });

  it("rejects usernames longer than 30 characters", () => {
    expect(USERNAME_RE.test("a".repeat(31))).toBe(false);
  });

  it("rejects special characters", () => {
    expect(USERNAME_RE.test("user!")).toBe(false);
    expect(USERNAME_RE.test("user name")).toBe(false);
    expect(USERNAME_RE.test("user@host")).toBe(false);
  });
});