import 'dart:async';

import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:in_app_purchase/in_app_purchase.dart';
import 'package:video_player/video_player.dart';

import '../../../../config/theme/dark_theme_colors.dart';
import '../../../../config/translations/strings_enum.dart';
import '../../../../utils/in_app_purchase_util.dart';
import '../../../../utils/log/logger.dart';
import '../../../components/ix_snackbar.dart';
import '../../../constants/assets.dart';
import '../../../controllers/api_controller.dart';
import '../../../data/models/channelplan/channel_plan_list.dart';
import '../../../data/sp/ix_sp.dart';
import '../../../dialog/loading/loading_dialog.dart';

class SubscriptionController extends GetxController {
  static const String TAG = 'SubscriptionController';
  final ApiController _apiController = Get.find<ApiController>();
  // 内购工具实例
  final InAppPurchaseUtil _iapUtil = InAppPurchaseUtil.instance;

  // 视频播放器控制器
  late VideoPlayerController videoController;
  final isVideoInitialized = false.obs;

  // 套餐列表加载状态
  final isLoadingPlans = false.obs;

  // 产品加载状态
  final isLoadingProducts = false.obs;

  // 购买处理中状态
  final isPurchasing = false.obs;

  // 产品列表（内购产品）
  final productDetails = <ProductDetails>[].obs;

  // 套餐列表（API 返回）
  final channelPlans = <ChannelPlan>[].obs;

  // 当前选中的订阅计划索引
  final selectedPlanIndex = 0.obs;

  /// 是否显示套餐变更信息（仅 userLevel == 3 时显示）
  bool get showPlanChangeInfo {
    final user = IXSP.getUser();
    return user?.userLevel == 3;
  }

  // 获取产品价格（优先使用内购价格，否则使用 API 返回的价格）
  String _getDisplayPrice(ChannelPlan plan) {
    // 尝试从内购获取价格
    final productId = plan.payoutData;
    if (productId != null && productId.isNotEmpty) {
      final product = _iapUtil.getProductById(productId);
      if (product != null) {
        return product.price;
      }
    }
    // 使用 API 返回的价格
    return _formatPrice(plan.price, plan.currency);
  }

  // 格式化价格
  String _formatPrice(double? price, int? currency) {
    if (price == null) return '';
    // currency: 1=USD, 2=CNY, etc. 根据实际情况调整
    final symbol = currency == 2 ? '¥' : '\$';
    return '$symbol${price.toStringAsFixed(2)}';
  }

  // 获取订阅周期显示文本
  String _getPeriodText(ChannelPlan plan) {
    if (plan.isSubscribe != true) {
      return Strings.once.tr; // 一次性购买（终身）
    }
    // 根据 subscribeType 和 subscribePeriodValue 确定周期
    // subscribeType: 1=天, 2=周, 3=月, 4=年
    switch (plan.subscribeType) {
      case 1:
        final days = plan.subscribePeriodValue ?? 1;
        return '/$days day${days > 1 ? 's' : ''}';
      case 2:
        return Strings.perWeek.tr;
      case 3:
        return '/month';
      case 4:
        return Strings.perYear.tr;
      default:
        return '';
    }
  }

  // 获取标签背景色
  Color? _getBadgeBgColor(ChannelPlan plan) {
    if (plan.tagType == 1) {
      return DarkThemeColors.bg1;
    }
    if (plan.tag != null && plan.tag!.isNotEmpty) {
      return DarkThemeColors.primaryColor;
    }
    return null;
  }

  // 获取标签文字颜色
  Color? _getBadgeTextColor(ChannelPlan plan) {
    if (plan.tagType == 1) {
      return DarkThemeColors.subscriptionColor;
    }
    if (plan.tag != null && plan.tag!.isNotEmpty) {
      return Colors.white;
    }
    return null;
  }

  @override
  void onInit() {
    super.onInit();
    _initializeVideoPlayer();
    _initializeInAppPurchase();
    _getChannelPlanList();
  }

  @override
  void onClose() {
    videoController.dispose();
    // 注意: 不要在这里调用 _iapUtil.dispose()
    // 因为它是单例，可能在其他地方还在使用
    super.onClose();
  }

  /// 获取套餐列表
  Future<void> _getChannelPlanList() async {
    isLoadingPlans.value = true;
    try {
      final plans = await _apiController.getChannelPlanList();
      channelPlans.value = plans;

      // 设置默认选中项
      final defaultIndex = plans.indexWhere((p) => p.isDefault == true);
      if (defaultIndex >= 0) {
        selectedPlanIndex.value = defaultIndex;
      }

      // 加载对应的内购产品
      await _loadProductsFromPlans();
    } catch (e) {
      log(TAG, '获取套餐列表失败: $e');
      IXSnackBar.showIXSnackBar(title: Strings.error.tr, message: '获取套餐列表失败');
    } finally {
      isLoadingPlans.value = false;
    }
  }

  /// 购买套餐
  Future<void> subscribe() async {
    await LoadingDialog.show(
      context: Get.context!,
      loadingText: 'Purchasing...',
      successText: 'Purchase successful',
      onRequest: () async {
        // 执行你的异步请求
        await _apiController.subscribe({
          'channelItemId': selectedPlan?.channelItemId,
        });
      },
      onSuccess: () {
        // 成功后的操作
      },
    );
  }

  /// 初始化内购
  Future<void> _initializeInAppPurchase() async {
    try {
      // 初始化内购
      final success = await _iapUtil.initialize(
        onSuccess: _handlePurchaseSuccess,
        onError: _handlePurchaseError,
        onCancelled: _handlePurchaseCancelled,
        onPending: _handlePurchasePending,
        onRestore: _handleRestoreSuccess,
      );

      if (!success) {
        IXSnackBar.showIXSnackBar(title: Strings.error.tr, message: '内购功能不可用');
      }
    } catch (e) {
      debugPrint('初始化内购失败: $e');
    }
  }

  /// 根据套餐列表加载内购产品
  Future<void> _loadProductsFromPlans() async {
    if (channelPlans.isEmpty) return;

    isLoadingProducts.value = true;
    try {
      // 从套餐列表中提取产品ID
      final productIdSet = channelPlans
          .where((p) => p.payoutData != null && p.payoutData!.isNotEmpty)
          .map((p) => p.payoutData!)
          .toSet();

      if (productIdSet.isEmpty) {
        debugPrint('没有需要加载的内购产品');
        return;
      }

      final success = await _iapUtil.loadProducts(productIdSet);
      if (success) {
        productDetails.value = _iapUtil.products;
        debugPrint('加载了 ${productDetails.length} 个产品');
        // 刷新套餐列表以更新价格显示
        channelPlans.refresh();
      }
    } catch (e) {
      debugPrint('加载产品失败: $e');
    } finally {
      isLoadingProducts.value = false;
    }
  }

  /// 处理购买成功
  void _handlePurchaseSuccess(PurchaseDetails purchaseDetails) {
    isPurchasing.value = false;
    IXSnackBar.showIXSnackBar(
      title: Strings.success.tr,
      message: '购买成功: ${purchaseDetails.productID}',
    );

    // TODO: 这里添加你的业务逻辑
    // 1. 更新用户订阅状态到服务器
    // 2. 更新本地存储
    // 3. 刷新 UI 显示
  }

  /// 处理购买失败
  void _handlePurchaseError(PurchaseDetails purchaseDetails) {
    isPurchasing.value = false;
    IXSnackBar.showIXSnackBar(
      title: Strings.error.tr,
      message: '购买失败: ${purchaseDetails.error?.message ?? "未知错误"}',
    );
  }

  /// 处理购买取消
  void _handlePurchaseCancelled(PurchaseDetails purchaseDetails) {
    isPurchasing.value = false;
    IXSnackBar.showIXSnackBar(title: Strings.info.tr, message: '购买已取消');
  }

  /// 处理购买等待中
  void _handlePurchasePending(PurchaseDetails purchaseDetails) {
    isPurchasing.value = true;
    IXSnackBar.showIXSnackBar(title: Strings.info.tr, message: '购买处理中...');
  }

  /// 处理恢复购买成功
  void _handleRestoreSuccess(PurchaseDetails purchaseDetails) {
    IXSnackBar.showIXSnackBar(
      title: Strings.success.tr,
      message: '恢复购买成功: ${purchaseDetails.productID}',
    );

    // TODO: 更新用户订阅状态
  }

  /// 发起购买
  Future<void> _requestPurchase(String productId) async {
    if (isPurchasing.value) {
      debugPrint('已有购买正在进行中');
      return;
    }

    isPurchasing.value = true;

    try {
      final success = await _iapUtil.purchaseProductById(productId);

      if (!success) {
        isPurchasing.value = false;
        IXSnackBar.showIXSnackBar(
          title: Strings.error.tr,
          message: '发起购买失败，请重试',
        );
      }
    } catch (e) {
      isPurchasing.value = false;
      debugPrint('购买异常: $e');
      IXSnackBar.showIXSnackBar(title: Strings.error.tr, message: '购买异常: $e');
    }
  }

  /// 恢复购买
  Future<void> _restorePurchases() async {
    try {
      final success = await _iapUtil.restorePurchases();

      if (success) {
        IXSnackBar.showIXSnackBar(
          title: Strings.info.tr,
          message: Strings.restoringPurchases.tr,
        );
      } else {
        IXSnackBar.showIXSnackBar(title: Strings.error.tr, message: '恢复购买失败');
      }
    } catch (e) {
      debugPrint('恢复购买异常: $e');
      IXSnackBar.showIXSnackBar(title: Strings.error.tr, message: '恢复购买异常: $e');
    }
  }

  // 初始化视频播放器
  void _initializeVideoPlayer() {
    videoController = VideoPlayerController.asset(Assets.subscriptionBg)
      ..initialize()
          .then((_) {
            isVideoInitialized.value = true;
            videoController.setLooping(true);
            videoController.setVolume(0); // 静音播放
            videoController.play();
          })
          .catchError((error) {
            print('视频初始化失败: $error');
          });
  }

  // 选择订阅计划
  void selectPlan(int index) {
    if (index >= 0 && index < channelPlans.length) {
      selectedPlanIndex.value = index;
    }
  }

  // 获取当前选中的套餐
  ChannelPlan? get selectedPlan {
    if (selectedPlanIndex.value < channelPlans.length) {
      return channelPlans[selectedPlanIndex.value];
    }
    return null;
  }

  /// 获取当前选中套餐的设备限制数量
  String get selectedPlanDeviceLimit {
    return (selectedPlan?.deviceLimit ?? 0).toString();
  }

  // 确认变更/购买
  void confirmChange() {
    final plan = selectedPlan;
    if (plan == null) {
      IXSnackBar.showIXSnackBar(title: Strings.error.tr, message: '请选择套餐');
      return;
    }

    final productId = plan.payoutData;
    if (productId == null || productId.isEmpty) {
      IXSnackBar.showIXSnackBar(title: Strings.error.tr, message: '产品ID未配置');
      return;
    }

    _requestPurchase(productId);
  }

  // 恢复购买
  void restorePurchases() {
    _restorePurchases();
  }

  // 支付问题
  void handlePaymentIssue() {
    // TODO: 实现支付问题处理逻辑
    IXSnackBar.showIXSnackBar(
      title: Strings.info.tr,
      message: Strings.openingPaymentSupport.tr,
    );
  }

  // ==================== 用于 UI 展示的便捷方法 ====================

  /// 获取套餐数量
  int get planCount => channelPlans.length;

  /// 获取指定索引的套餐标题
  String getPlanTitle(int index) {
    if (index < channelPlans.length) {
      return channelPlans[index].title ?? '';
    }
    return '';
  }

  /// 获取指定索引的套餐副标题
  String getPlanSubTitle(int index) {
    if (index < channelPlans.length) {
      return channelPlans[index].subTitle ?? '';
    }
    return '';
  }

  /// 获取指定索引的套餐介绍
  String getPlanIntroduce(int index) {
    if (index < channelPlans.length) {
      return channelPlans[index].introduce ?? '';
    }
    return '';
  }

  /// 获取指定索引的套餐价格显示
  String getPlanPrice(int index) {
    if (index < channelPlans.length) {
      return _getDisplayPrice(channelPlans[index]);
    }
    return '';
  }

  /// 获取指定索引的套餐周期显示
  String getPlanPeriod(int index) {
    if (index < channelPlans.length) {
      return _getPeriodText(channelPlans[index]);
    }
    return '';
  }

  /// 获取指定索引的套餐标签
  String getPlanBadge(int index) {
    if (index < channelPlans.length) {
      return channelPlans[index].tag ?? '';
    }
    return '';
  }

  /// 获取指定索引的标签背景色
  Color? getPlanBadgeBgColor(int index) {
    if (index < channelPlans.length) {
      return _getBadgeBgColor(channelPlans[index]);
    }
    return null;
  }

  /// 获取指定索引的标签文字颜色
  Color? getPlanBadgeTextColor(int index) {
    if (index < channelPlans.length) {
      return _getBadgeTextColor(channelPlans[index]);
    }
    return null;
  }

  /// 获取指定索引的标签边框颜色
  Color? getPlanBadgeBorderColor(int index) {
    if (index < channelPlans.length) {
      final plan = channelPlans[index];
      if (plan.recommend == true) {
        return DarkThemeColors.dividerColor;
      }
    }
    return null;
  }

  /// 是否显示原价（有折扣时显示）
  bool showOriginalPrice(int index) {
    if (index < channelPlans.length) {
      final plan = channelPlans[index];
      return plan.orgPrice != null &&
          plan.price != null &&
          plan.orgPrice! > plan.price!;
    }
    return false;
  }

  /// 获取原价显示
  String getPlanOriginalPrice(int index) {
    if (index < channelPlans.length) {
      final plan = channelPlans[index];
      return _formatPrice(plan.orgPrice, plan.currency);
    }
    return '';
  }
}