/**
 * @file openInPreview.test.ts
 * @description The one link rule: which URLs the Preview takes (http(s),
 * never the dashboard's origin, `0.0.0.0` read as `localhost`), that a local
 * link goes to the session panel only when one answers, and that a
 * Ctrl/Cmd click keeps the browser's own tab.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { afterEach, describe, expect, it, vi } from "vitest";
import {
  OPEN_IN_PREVIEW_EVENT,
  isLoopbackUrl,
  normalizePreviewUrl,
  onLinkClick,
  openInPreview,
  type OpenInPreview,
} from "../openInPreview";

const SELF = "http://localhost:4820";

describe("normalizePreviewUrl", () => {
  it("adds http:// to a bare host:port and reads 0.0.0.0 as localhost", () => {
    expect(normalizePreviewUrl("localhost:3000", SELF)).toBe("http://localhost:3000/");
    expect(normalizePreviewUrl("http://0.0.0.0:5173/a", SELF)).toBe("http://localhost:5173/a");
  });
  it("refuses the dashboard's own origin, other schemes and credentials", () => {
    expect(normalizePreviewUrl("http://localhost:4820/settings", SELF)).toBeNull();
    expect(normalizePreviewUrl("javascript:alert(1)", SELF)).toBeNull();
    expect(normalizePreviewUrl("file:///etc/passwd", SELF)).toBeNull();
    expect(normalizePreviewUrl("http://u:p@localhost:3000", SELF)).toBeNull();
    expect(normalizePreviewUrl("  ", SELF)).toBeNull();
  });
  it("accepts an external https page", () => {
    expect(normalizePreviewUrl("https://example.com/x", SELF)).toBe("https://example.com/x");
  });
});

describe("isLoopbackUrl", () => {
  it("is true only for this machine's hosts", () => {
    expect(isLoopbackUrl("http://localhost:3000")).toBe(true);
    expect(isLoopbackUrl("http://127.0.0.1:8080/x")).toBe(true);
    expect(isLoopbackUrl("http://[::1]:3000")).toBe(true);
    expect(isLoopbackUrl("https://github.com")).toBe(false);
    expect(isLoopbackUrl("not a url")).toBe(false);
  });
});

describe("openInPreview", () => {
  let off: (() => void) | null = null;
  afterEach(() => off?.());
  const listen = (take: boolean) => {
    const seen: string[] = [];
    const fn = (e: Event) => {
      const d = (e as CustomEvent<OpenInPreview>).detail;
      seen.push(d.url);
      if (take) d.handled = true;
    };
    window.addEventListener(OPEN_IN_PREVIEW_EVENT, fn);
    off = () => window.removeEventListener(OPEN_IN_PREVIEW_EVENT, fn);
    return seen;
  };

  it("hands a local page to a listening panel", () => {
    const seen = listen(true);
    expect(openInPreview("http://localhost:3000/login")).toBe(true);
    expect(seen).toEqual(["http://localhost:3000/login"]);
  });
  it("falls back when no panel takes it, and never sends an external page", () => {
    const seen = listen(false);
    expect(openInPreview("http://localhost:3000")).toBe(false);
    expect(openInPreview("https://github.com/login")).toBe(false);
    expect(seen).toEqual(["http://localhost:3000/"]);
  });
  it("leaves a Ctrl/Cmd click to the browser", () => {
    listen(true);
    const preventDefault = vi.fn();
    const base = { ctrlKey: false, metaKey: false, shiftKey: false, button: 0, preventDefault };
    onLinkClick({ ...base, ctrlKey: true }, "http://localhost:3000");
    expect(preventDefault).not.toHaveBeenCalled();
    onLinkClick(base, "http://localhost:3000");
    expect(preventDefault).toHaveBeenCalledTimes(1);
  });
});