// background/checkout-api-utils.js — API helpers for Stripe/PayPal checkout automation
(function attachCheckoutApiUtils(root) {
  root.MultiPageCheckoutApiUtils = (function createCheckoutApiUtilsModule() {

    const ADDRESS_API_URL = 'https://www.meiguodizhi.com/api/v1/dz';
    const CHATGPT_CHECKOUT_URL = 'https://chatgpt.com/backend-api/payments/checkout';
    const DEFAULT_PAYPAL_SMS_MAX_ATTEMPTS = 18;
    const DEFAULT_PAYPAL_SMS_INTERVAL_MS = 5000;

    /**
     * Fetch a random US address from meiguodizhi.com.
     * @returns {Promise<{street: string, city: string, state: string, zip: string}>}
     */
    async function fetchRandomAddress() {
      try {
        const response = await fetch(ADDRESS_API_URL, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ path: '/', method: 'address' }),
        });
        const d = await response.json();
        const a = d.address || d;
        return {
          street: a.Address || a.street || '123 Main St',
          city: a.City || a.city || 'New York',
          state: a.State_Full || a.State || a.state || 'New York',
          zip: String(a.Zip_Code || a.zip || '10001').substring(0, 5),
        };
      } catch (e) {
        console.error('[CheckoutAPI] 获取随机地址失败:', e.message);
        return { street: '123 Main St', city: 'New York', state: 'New York', zip: '10001' };
      }
    }

    /**
     * Generate a ChatGPT Plus Stripe hosted checkout URL.
     * @param {string} accessToken - ChatGPT session access token
     * @returns {Promise<{hostedUrl: string, checkoutSessionId: string}|null>}
     */
    async function generateCheckoutLink(accessToken) {
      try {
        const payload = {
          plan_name: 'chatgptplusplan',
          billing_details: { country: 'US', currency: 'USD' },
          cancel_url: 'https://chatgpt.com/#pricing',
          promo_campaign: { promo_campaign_id: 'plus-1-month-free', is_coupon_from_query_param: false },
          checkout_ui_mode: 'hosted',
        };

        const response = await fetch(CHATGPT_CHECKOUT_URL, {
          method: 'POST',
          headers: {
            'Authorization': `Bearer ${accessToken}`,
            'Content-Type': 'application/json',
          },
          body: JSON.stringify(payload),
        });

        const data = await response.json();

        if (!response.ok) {
          console.error('[CheckoutAPI] 请求失败 HTTP', response.status, data);
          return null;
        }

        const hostedUrl = data?.url || data?.stripe_hosted_url || data?.checkout_url;
        if (!hostedUrl) {
          console.error('[CheckoutAPI] 未找到长链接', data);
          return null;
        }

        return {
          hostedUrl,
          checkoutSessionId: data.checkout_session_id || '',
        };
      } catch (e) {
        console.error('[CheckoutAPI] 生成 Plus 链接异常:', e.message);
        return null;
      }
    }

    function collectSmsTextValues(value, results = []) {
      if (value === null || value === undefined) {
        return results;
      }
      if (typeof value === 'string' || typeof value === 'number') {
        results.push(String(value));
        return results;
      }
      if (Array.isArray(value)) {
        value.forEach((item) => collectSmsTextValues(item, results));
        return results;
      }
      if (typeof value === 'object') {
        const preferredKeys = [
          'code',
          'sms',
          'message',
          'msg',
          'content',
          'text',
          'data',
          'result',
        ];
        preferredKeys.forEach((key) => {
          if (Object.prototype.hasOwnProperty.call(value, key)) {
            collectSmsTextValues(value[key], results);
          }
        });
        Object.keys(value)
          .filter((key) => !preferredKeys.includes(key))
          .forEach((key) => collectSmsTextValues(value[key], results));
      }
      return results;
    }

    function extractPaypalSmsCode(rawPayload, options = {}) {
      const excluded = new Set((options.excludeCodes || []).map((code) => String(code || '').trim()).filter(Boolean));
      const rawText = String(rawPayload || '').trim();
      if (!rawText) return '';

      let values = [rawText];
      try {
        values = collectSmsTextValues(JSON.parse(rawText));
      } catch {
        // Plain text API responses are expected.
      }

      const candidates = [];
      values.forEach((value) => {
        String(value || '').replace(/\b(\d{4,8})\b/g, (_, code) => {
          if (!excluded.has(code)) {
            candidates.push(code);
          }
          return _;
        });
      });

      return candidates.find((code) => code.length === 6)
        || candidates.find((code) => code.length >= 4 && code.length <= 8)
        || '';
    }

    async function fetchPaypalSmsCode(options = {}, deps = {}) {
      const fetchImpl = deps.fetchImpl || fetch;
      const sleep = deps.sleep || ((ms) => new Promise((resolve) => setTimeout(resolve, ms)));
      const addLog = deps.addLog || (async () => {});
      const throwIfStopped = deps.throwIfStopped || (() => {});
      const smsApiUrl = String(options.smsApiUrl || '').trim();
      if (!smsApiUrl) {
        throw new Error('PayPal 短信收码 API 未配置。');
      }

      const maxAttempts = Math.max(1, Math.floor(Number(options.maxAttempts) || DEFAULT_PAYPAL_SMS_MAX_ATTEMPTS));
      const intervalMs = Math.max(500, Math.floor(Number(options.intervalMs) || DEFAULT_PAYPAL_SMS_INTERVAL_MS));
      let lastError = '';

      for (let attempt = 1; attempt <= maxAttempts; attempt += 1) {
        throwIfStopped();
        try {
          const response = await fetchImpl(smsApiUrl, {
            method: 'GET',
            cache: 'no-store',
          });
          const text = await response.text();
          if (!response.ok) {
            lastError = `HTTP ${response.status}: ${text.slice(0, 120)}`;
          } else {
            const code = extractPaypalSmsCode(text, {
              excludeCodes: options.excludeCodes || [],
            });
            if (code) {
              return {
                code,
                attempt,
                raw: text,
              };
            }
            lastError = text.slice(0, 160) || '接口未返回验证码';
          }
        } catch (error) {
          lastError = error?.message || String(error || '请求失败');
        }

        if (attempt < maxAttempts) {
          await addLog(`PayPal 短信验证码暂未获取到，${Math.round(intervalMs / 1000)} 秒后重试（${attempt}/${maxAttempts}）。`, 'info');
          await sleep(intervalMs);
        }
      }

      throw new Error(`PayPal 短信验证码获取超时。最后响应：${lastError || '无响应'}`);
    }

    return {
      extractPaypalSmsCode,
      fetchRandomAddress,
      fetchPaypalSmsCode,
      generateCheckoutLink,
    };
  })();
})(typeof self !== 'undefined' ? self : globalThis);