import { test, expect, beforeEach } from "bun:test";
import { Window } from "happy-dom";
import { NAV_RUNTIME } from "../src/nav-runtime.ts";

let win: any;
let fetchCalls: { url: string; opts: any }[];
let nextHtml: string;

function install(bodyHtml: string): void {
  win = new Window({ url: "https://example.test/" });
  win.document.body.innerHTML = bodyHtml;
  fetchCalls = [];
  nextHtml = "";
  const g = globalThis as any;
  g.window = win;
  g.document = win.document;
  g.history = win.history;
  g.location = win.location;
  g.DOMParser = win.DOMParser;
  g.CustomEvent = win.CustomEvent;
  g.fetch = win.fetch = (url: string, opts: any) => {
    fetchCalls.push({ url, opts });
    return Promise.resolve({
      redirected: false,
      url,
      headers: {
        get: (k: string) =>
          k.toLowerCase() === "content-type" ? "text/html; charset=utf-8" : null,
      },
      text: () => Promise.resolve(nextHtml),
    });
  };
  (0, eval)(NAV_RUNTIME);
}

const flush = () => new Promise((r) => setTimeout(r, 0));

beforeEach(() => {
  const g = globalThis as any;
  for (const k of [
    "window",
    "document",
    "history",
    "location",
    "DOMParser",
    "CustomEvent",
    "fetch",
  ]) {
    delete g[k];
  }
});

test("intercepts an internal link click and swaps #app in place", async () => {
  install(`<div id="app"><h1>Home</h1><a href="/about" id="lnk">About</a></div>`);
  nextHtml =
    `<!doctype html><html><head><title>About</title></head>` +
    `<body><div id="app"><h1>About page</h1></div></body></html>`;
  win.document.getElementById("lnk").click();
  await flush();
  expect(fetchCalls.length).toBe(1);
  expect(fetchCalls[0]!.url).toContain("/about");
  expect(fetchCalls[0]!.opts.headers["x-wrnexus-nav"]).toBe("1");
  expect(win.document.getElementById("app").innerHTML).toContain("About page");
  expect(win.document.title).toBe("About");
});

test("ignores cross-origin links (full navigation)", async () => {
  install(`<div id="app"><a href="https://other.test/x" id="lnk">x</a></div>`);
  win.document.getElementById("lnk").click();
  await flush();
  expect(fetchCalls.length).toBe(0);
});

test("ignores modified clicks so new-tab still works", async () => {
  install(`<div id="app"><a href="/about" id="lnk">x</a></div>`);
  win.document
    .getElementById("lnk")
    .dispatchEvent(
      new win.MouseEvent("click", { bubbles: true, cancelable: true, button: 0, metaKey: true }),
    );
  await flush();
  expect(fetchCalls.length).toBe(0);
});

test("exposes programmatic navigation", async () => {
  install(`<div id="app"><h1>Home</h1></div>`);
  nextHtml = `<html><head><title>Dash</title></head><body><div id="app"><h1>Dashboard</h1></div></body></html>`;
  expect(typeof win.__wrnexusNavigate).toBe("function");
  win.__wrnexusNavigate("/dashboard");
  await flush();
  expect(fetchCalls.length).toBe(1);
  expect(win.document.getElementById("app").innerHTML).toContain("Dashboard");
});

test("rebinds theme controls after swapping the page", async () => {
  install(`<div id="app"><a href="/about" id="lnk">About</a></div>`);
  let boundRoot: unknown;
  win.wireTheme = { bind: (root: unknown) => (boundRoot = root) };
  nextHtml = `<html><body><div id="app"><button data-wire-theme-toggle>Theme</button></div></body></html>`;

  win.document.getElementById("lnk").click();
  await flush();

  expect(boundRoot).toBe(win.document);
  expect(win.document.querySelector("[data-wire-theme-toggle]")).not.toBeNull();
});
