// ==UserScript==
// @name         Nite's Game | 免费获取 Steam 游戏资源
// @namespace    https://game.nite07.com
// @version      1.0.0
// @description  在 Steam 商店页面添加免费获取游戏资源的跳转链接
// @author       Nite
// @match        https://store.steampowered.com/app/*
// @grant        GM_xmlhttpRequest
// @connect      game.nite07.com
// @homepage     https://game.nite07.com
// @license      MIT
// ==/UserScript==

(function () {
  "use strict";

  // 从 URL 中提取游戏 ID
  const getGameId = () => {
    const match = window.location.pathname.match(/\/app\/(\d+)/);
    return match ? match[1] : null;
  };

  // 使用 Get 请求检查游戏页面是否存在
  const checkGamePage = (gameId) => {
    return new Promise((resolve) => {
      GM_xmlhttpRequest({
        method: "GET",
        url: `https://game.nite07.com/game/steam/${gameId}`,
        onload: (response) => {
          resolve(response.status === 200);
        },
        onerror: () => {
          resolve(false);
        },
        ontimeout: () => {
          resolve(false);
        },
        timeout: 5000,
      });
    });
  };

  // 添加按钮到页面
  const addButton = (gameId) => {
    const purchaseArea = document.querySelector("#game_area_purchase");
    if (!purchaseArea) {
      console.log("未找到购买区域");
      return;
    }

    // 获取游戏名称
    const gameName =
      document.querySelector(".apphub_AppName")?.textContent || "game";

    // 创建按钮容器，完全模仿 Steam 官方样式
    const buttonContainer = document.createElement("div");
    buttonContainer.className = "game_area_purchase_game";
    buttonContainer.setAttribute("role", "region");
    buttonContainer.setAttribute(
      "aria-labelledby",
      `game_area_purchase_section_external_${gameId}`,
    );

    buttonContainer.innerHTML = `
            <div class="game_area_purchase_platform"><span class="platform_img win"></span></div>
            <h2 id="game_area_purchase_section_external_${gameId}" class="title">
                Play ${gameName}
            </h2>
            <div class="game_purchase_action">
                <div class="game_purchase_action_bg">
                    <div class="game_purchase_price price">
                        Free to play
                    </div>
                    <div class="btn_addtocart">
                        <a class="btn_green_steamui btn_medium"
                           href="https://game.nite07.com/game/steam/${gameId}"
                           target="_blank">
                            <span>Go</span>
                        </a>
                    </div>
                </div>
            </div>
        `;

    // 插入到购买区域的第一个子元素之前
    purchaseArea.insertBefore(buttonContainer, purchaseArea.firstChild);
  };

  // 主函数
  const init = async () => {
    const gameId = getGameId();
    if (!gameId) {
      return;
    }

    console.log(`[Steam 外部链接] 检测到游戏 ID: ${gameId}`);

    const exists = await checkGamePage(gameId);
    if (exists) {
      console.log(`[Steam 外部链接] 页面存在，添加按钮`);
      addButton(gameId);
    } else {
      console.log(`[Steam 外部链接] 页面不存在，跳过`);
    }
  };

  // 等待页面加载完成后执行
  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", init);
  } else {
    init();
  }
})();