"use strict";

const assert = require("node:assert/strict");
const fs = require("node:fs");
const path = require("node:path");
const vm = require("node:vm");

/** 用最小 DOM 替身检查快速切换英雄时旧请求不会覆盖新预览。 */
async function checkLatestChampionWins() {
  const elements = new Map();
  const pending = new Map();
  const element = (id) => {
    if (!elements.has(id)) elements.set(id, {
      id, dataset: {}, style: { setProperty() {} }, scrollTop: 0,
      classList: { toggle() {}, contains() { return false; } },
      setAttribute() {}, contains() { return false; }, appendChild() {},
      querySelector() { return null; }, querySelectorAll() { return []; },
    });
    return elements.get(id);
  };
  const document = {
    getElementById: element,
    documentElement: element("root"),
    activeElement: null,
    createElement() { return { ...element("button"), dataset: {} }; },
    querySelectorAll() { return []; },
  };
  const reply = (data) => ({ ok: true, json: async () => data });
  const context = vm.createContext({
    document,
    localStorage: { getItem() { return null; }, setItem() {} },
    setTimeout, clearTimeout, setInterval() {},
    fetch(url) {
      if (url.startsWith("/api/skins")) {
        const id = Number(new URL(url, "http://localhost").searchParams.get("id"));
        return new Promise((resolve) => pending.set(id, resolve));
      }
      if (url === "/api/champions") return Promise.resolve(reply([]));
      if (url === "/api/current") return Promise.resolve(reply({ championId: 0 }));
      return Promise.resolve(reply({ lcu: "disconnected", profile: { server: "global", injectionMode: "cslol" }, skins: 0 }));
    },
  });
  vm.runInContext(fs.readFileSync(path.join(__dirname, "renderer.js"), "utf8"), context);
  const first = vm.runInContext("openChampion(1)", context);
  const second = vm.runInContext("openChampion(2)", context);
  pending.get(2)(reply({ id: 2, name: "新英雄", skins: [] }));
  await second;
  pending.get(1)(reply({ id: 1, name: "旧英雄", skins: [] }));
  await first;
  assert.equal(vm.runInContext("detail.id", context), 2);
}

checkLatestChampionWins().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});