import { describe, expect, it } from "vitest";
import { pageCountFor, parsePage } from "@/lib/pagination";
import { isValidLinkUrl } from "@/lib/validation";

describe("parsePage", () => {
  it("parses plain positive integers", () => {
    expect(parsePage("1")).toBe(1);
    expect(parsePage("42")).toBe(42);
  });

  it("collapses missing values to page 1", () => {
    expect(parsePage(undefined)).toBe(1);
    expect(parsePage("")).toBe(1);
  });

  it("collapses malformed values to page 1", () => {
    expect(parsePage("abc")).toBe(1);
    expect(parsePage("-3")).toBe(1);
    expect(parsePage("0")).toBe(1);
    expect(parsePage("1.5")).toBe(1);
    expect(parsePage("1e3")).toBe(1);
    expect(parsePage("2abc")).toBe(1);
  });

  it("uses the first entry of repeated params", () => {
    expect(parsePage(["3", "9"])).toBe(3);
  });

  it("caps absurdly large values", () => {
    expect(parsePage("99999999999999")).toBe(100_000);
  });
});

describe("pageCountFor", () => {
  it("computes ceilings and never returns less than one page", () => {
    expect(pageCountFor(0, 5)).toBe(1);
    expect(pageCountFor(5, 5)).toBe(1);
    expect(pageCountFor(6, 5)).toBe(2);
  });
});

describe("isValidLinkUrl", () => {
  it("accepts http(s) URLs and site-relative paths", () => {
    expect(isValidLinkUrl("https://example.com/x")).toBe(true);
    expect(isValidLinkUrl("http://example.com")).toBe(true);
    expect(isValidLinkUrl("/posts")).toBe(true);
  });

  it("rejects other schemes and protocol-relative URLs", () => {
    expect(isValidLinkUrl("javascript:alert(1)")).toBe(false);
    expect(isValidLinkUrl("ftp://example.com")).toBe(false);
    expect(isValidLinkUrl("//evil.example")).toBe(false);
    expect(isValidLinkUrl("not a url")).toBe(false);
  });
});