import 'dart:async';

import 'package:adjust_sdk/adjust.dart';
import 'package:adjust_sdk/adjust_event.dart';
import 'package:facebook_app_events/facebook_app_events.dart';
import 'package:logger/logger.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../config/facebook_config.dart';

/// 事件埋点：Adjust + Facebook App Events 双通道上报
/// Adjust 识别码见 docs/adjuest.md
abstract final class AdjustEvents {
  static final _fb = FacebookAppEvents();
  static final _fbLog = Logger(
    printer: PrettyPrinter(methodCount: 0, lineLength: 120),
    level: FacebookConfig.debugLogs ? Level.trace : Level.off,
  );
  // 购买档位（充值页选择档位时上报）
  static const String tier1999 = 'm0r9u9'; // 19.99
  static const String tier4999 = 'aht1ve'; // 49.99
  static const String tier599 = '47hhx9'; // 5.99
  static const String tier999 = 'w775gd'; // 9.99
  static const String tier9999 = 'y7994m'; // 99.99

  // 首日充值
  static const String firstPurchase = 'r6w4bi';

  // 支付失败
  static const String orderAbnormal = '4txlo1';

  // 支付成功
  static const String purchase = 'ek780r';

  // 注册（首次调用 fast_login 成功时）
  static const String register = '2z3dm4';

  // 其他
  static const String monthlyVip = '96o5ez'; // PetsHero AI Monthly VIP
  static const String weeklyVip = '95yg4o'; // PetsHero AI Weekly VIP

  /// 根据金额（如 19.99, 9.99）返回档位事件 token，无法匹配时返回 purchase
  static String? tierTokenFromPrice(num price) {
    final p = price.toStringAsFixed(2);
    switch (p) {
      case '5.99':
        return tier599;
      case '9.99':
        return tier999;
      case '19.99':
        return tier1999;
      case '49.99':
        return tier4999;
      case '99.99':
        return tier9999;
      default:
        return purchase;
    }
  }

  /// 从金额字符串解析数字（如 "¥19.99" / "\$19.99"）
  static num? parsePrice(String amount) {
    final match = RegExp(r'[\d.]+').firstMatch(amount);
    if (match == null) return null;
    return num.tryParse(match.group(0)!);
  }

  static void _track(String eventToken) {
    Adjust.trackEvent(AdjustEvent(eventToken));
  }

  /// 上报 Facebook（fire-and-forget，不阻塞主流程）
  static void _trackFb(String eventDesc, Future<void> Function() fn) {
    if (FacebookConfig.debugLogs) _fbLog.w('FB ↑ $eventDesc');
    unawaited(fn());
  }

  /// 购买档位（用户点击某档位购买时）
  static void trackTier(String eventToken) {
    _track(eventToken);
  }

  /// 首日充值
  static void trackFirstPurchase(double amount) {
    _track(firstPurchase);
    _trackFb(
        'FirstRecharge amount=$amount',
        () => _fb
            .logEvent(name: 'FirstRecharge', parameters: {'amount': amount}));
  }

  /// 支付失败
  static void trackOrderAbnormal() {
    _track(orderAbnormal);
    _trackFb('payment_failed', () => _fb.logEvent(name: 'payment_failed'));
  }

  /// 注册（fast_login 返回 equip=true / firstRegister 时）
  static void trackRegister() {
    _track(register);
    _trackFb('CompletedRegistration',
        () => _fb.logCompletedRegistration(registrationMethod: 'device'));
  }

  /// PetsHero AI Monthly VIP
  static void trackMonthlyVip() {
    _track(monthlyVip);
    _trackFb('Subscribe monthly_vip',
        () => _fb.logSubscribe(orderId: 'monthly_vip'));
  }

  /// PetsHero AI Weekly VIP
  static void trackWeeklyVip() {
    _track(weeklyVip);
    _trackFb(
        'Subscribe weekly_vip', () => _fb.logSubscribe(orderId: 'weekly_vip'));
  }

  static const String _keyRegisterDate = 'adjust_register_date';

  /// 支付成功时调用：上报 Purchase，若为首日充值则同时上报 first purchase
  static Future<void> trackPurchaseSuccess(double amount) async {
    _track(purchase);
    final prefs = await SharedPreferences.getInstance();
    final registerDate = prefs.getString(_keyRegisterDate);
    final isFirstPurchase = registerDate != null &&
        registerDate == DateTime.now().toIso8601String().substring(0, 10);
    if (isFirstPurchase) {
      trackFirstPurchase(amount);
    }
    _trackFb(
        'Purchase',
        () => _fb.logPurchase(
              amount: amount,
              currency: 'USD',
            ));
  }

  /// 支付失败时调用
  static void trackPaymentFailed() {
    trackOrderAbnormal();
  }
}