// background/steps/get-plus-link.js — Step 6: Get ChatGPT Plus Stripe checkout link
(function attachBackgroundStep11(root, factory) {
  root.MultiPageBackgroundStep11 = factory();
})(typeof self !== 'undefined' ? self : globalThis, function createBackgroundStep11Module() {
  const PAYURL_CHECKOUT_ENDPOINT = 'https://payurl.ark2.cn/api/checkout';
  const PAYURL_CHECKOUT_MAX_ATTEMPTS = 5;
  const PAYURL_CHECKOUT_RETRY_DELAY_MS = 1200;

  function createStep11Executor(deps = {}) {
    const {
      addLog,
      chrome,
      completeStepFromBackground,
      getTabId,
      reuseOrCreateTab,
      waitForTabStableComplete = null,
    } = deps;

    async function executeStep11() {
      await addLog('步骤 6：正在获取 ChatGPT Plus 订阅链接...');

      const tabId = await getTabId('signup-page');

      if (!tabId) {
        throw new Error('未找到 ChatGPT 标签页，请先打开 chatgpt.com');
      }

      await waitForChatGptLoginPageStable(tabId, {
        addLog,
        waitForTabStableComplete,
      });

      const accessToken = await getChatGptAccessToken(tabId, chrome, addLog);
      if (!accessToken) {
        throw new Error('未获取到 accessToken，请确认已登录 ChatGPT');
      }

      await addLog('已获取 ChatGPT Session Token，正在请求 Plus 长链...');
      const result = await requestPayurlCheckoutWithRetry(accessToken, addLog);

      if (!result.hostedUrl) {
        throw new Error('未从 payurl.ark2.cn 响应中解析到 Plus 长链');
      }

      await addLog(`已获取 Plus 链接，正在跳转到 Stripe 结账页面...`);
      await addLog(`Session ID: ${result.checkoutSessionId || '未知'}`);

      // Navigate to the Stripe checkout URL
      await reuseOrCreateTab('signup-page', result.hostedUrl, {
        reloadIfSameUrl: false,
      });

      await completeStepFromBackground(6, {
        checkoutUrl: result.hostedUrl,
        checkoutSessionId: result.checkoutSessionId,
        chatgptCheckoutUrl: result.chatgptCheckoutUrl,
        openaiPayUrl: result.openaiPayUrl,
      });
    }

    return { executeStep11 };
  }

  async function waitForChatGptLoginPageStable(tabId, deps = {}) {
    const {
      addLog,
      waitForTabStableComplete,
    } = deps;
    if (typeof waitForTabStableComplete !== 'function') {
      return null;
    }

    await addLog('步骤 6：正在等待步骤 5 登录后的 ChatGPT 页面稳定，再读取 Session...', 'info');
    const startedAt = Date.now();
    let lastTab = null;
    while (Date.now() - startedAt < 45000) {
      lastTab = await waitForTabStableComplete(tabId, {
        timeoutMs: 6000,
        retryDelayMs: 300,
        stableMs: 1500,
        initialDelayMs: 600,
      });
      if (!lastTab) {
        throw new Error('步骤 6：ChatGPT 标签页已关闭，无法获取 Session。');
      }
      const url = String(lastTab.url || '');
      if (isChatGptWebUrl(url)) {
        await addLog('步骤 6：ChatGPT 页面已稳定，开始读取 Session。', 'info');
        return lastTab;
      }
      await sleep(500);
    }

    const lastUrl = String(lastTab?.url || '');
    await addLog(
      `步骤 6：等待 ChatGPT 页面稳定超时，最后页面为 ${lastUrl || 'unknown'}，将继续尝试读取 Session。`,
      'warn'
    );
    return lastTab;
  }

  function isChatGptWebUrl(rawUrl = '') {
    try {
      const parsed = new URL(String(rawUrl || ''));
      return /(?:^|\.)chatgpt\.com$/i.test(parsed.hostname);
    } catch {
      return false;
    }
  }

  async function getChatGptAccessToken(tabId, chrome, addLog) {
    try {
      return await fetchAccessTokenFromSessionEndpoint();
    } catch (error) {
      await addLog(`后台获取 ChatGPT Session Token 失败，尝试在页面上下文重试：${error.message}`, 'warn');
    }

    const results = await chrome.scripting.executeScript({
      target: { tabId },
      func: fetchAccessTokenInPage,
    });
    const tokenResult = results?.[0]?.result;
    if (!tokenResult || tokenResult.error) {
      throw new Error(tokenResult?.error || '获取 ChatGPT Session Token 失败，请确认已登录 ChatGPT');
    }
    return String(tokenResult.accessToken || '').trim();
  }

  async function fetchAccessTokenFromSessionEndpoint() {
    const sessionResp = await fetch('https://chatgpt.com/api/auth/session', {
      credentials: 'include',
      headers: {
        'Accept': 'application/json',
      },
    });
    const text = await sessionResp.text();
    let session = null;
    try {
      session = text ? JSON.parse(text) : null;
    } catch (error) {
      throw new Error(`Session 响应不是有效 JSON：${text.slice(0, 300)}`);
    }
    if (!sessionResp.ok) {
      throw new Error(`Session 请求失败，HTTP ${sessionResp.status}: ${JSON.stringify(session)}`);
    }
    const accessToken = String(session?.accessToken || '').trim();
    if (!accessToken) {
      throw new Error('Session 响应中没有 accessToken');
    }
    return accessToken;
  }

  /**
   * This function is executed in the page context via chrome.scripting.executeScript.
   * It has access to the page's cookies and can make same-origin requests.
   */
  async function fetchAccessTokenInPage() {
    try {
      const sessionResp = await fetch('https://chatgpt.com/api/auth/session', {
        credentials: 'include',
      });
      const session = await sessionResp.json();
      const accessToken = session?.accessToken;
      if (!accessToken) {
        return { error: '未获取到 accessToken，请确认已登录 ChatGPT' };
      }
      return { accessToken };
    } catch (e) {
      return { error: e.message };
    }
  }

  async function requestPayurlCheckoutWithRetry(accessToken, addLog) {
    let lastError = null;
    for (let attempt = 1; attempt <= PAYURL_CHECKOUT_MAX_ATTEMPTS; attempt += 1) {
      try {
        if (attempt > 1) {
          await addLog(`Plus 长链获取失败，正在重试 ${attempt}/${PAYURL_CHECKOUT_MAX_ATTEMPTS}...`, 'warn');
          await sleep(PAYURL_CHECKOUT_RETRY_DELAY_MS);
        }
        return await requestPayurlCheckout(accessToken);
      } catch (error) {
        lastError = error;
        await addLog(`Plus 长链获取失败（${attempt}/${PAYURL_CHECKOUT_MAX_ATTEMPTS}）：${error.message}`, 'warn');
      }
    }
    throw new Error(`Plus 长链获取连续失败 ${PAYURL_CHECKOUT_MAX_ATTEMPTS} 次：${lastError?.message || '未知错误'}`);
  }

  async function requestPayurlCheckout(accessToken) {
    const payload = {
      token: accessToken,
      plan: 'plus',
      checkout_ui_mode: 'hosted',
      ui_language: 'en',
      country: 'US',
      currency: 'USD',
      proxy: '',
      use_promo: true,
      promo_code: 'STRIPEATLASGPT4BIZ050126',
      workspace_name: 'linux-do',
      seat_quantity: 2,
    };

    const response = await fetch(PAYURL_CHECKOUT_ENDPOINT, {
      method: 'POST',
      headers: {
        'Accept': '*/*',
        'Accept-Language': 'zh-CN,zh;q=0.9',
        'Content-Type': 'application/json',
        'DNT': '1',
        'Origin': 'https://payurl.ark2.cn',
        'Referer': 'https://payurl.ark2.cn/',
      },
      body: JSON.stringify(payload),
    });

    const responseText = await response.text();
    let data = null;
    try {
      data = responseText ? JSON.parse(responseText) : null;
    } catch (error) {
      throw new Error(`payurl 响应不是有效 JSON：${responseText.slice(0, 300)}`);
    }

    if (!response.ok) {
      throw new Error(`payurl 请求失败，HTTP ${response.status}: ${JSON.stringify(data)}`);
    }

    const hostedUrl = data?.url || data?.openai_payurl || data?.chatgpt_checkout_url || '';
    if (!hostedUrl) {
      throw new Error(`payurl 响应中未找到 url/openai_payurl/chatgpt_checkout_url：${JSON.stringify(data)}`);
    }

    return {
      hostedUrl,
      checkoutSessionId: data.checkout_session_id || '',
      chatgptCheckoutUrl: data.chatgpt_checkout_url || '',
      openaiPayUrl: data.openai_payurl || data.url || '',
    };
  }

  function sleep(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
  }

  return { createStep11Executor };
});