import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../../../data/models/goods.dart';
import '../../../data/models/user_Info.dart';
import '../controllers/goodsvip_controller.dart';
import '../utils/goods_i18n.dart';
import 'widgets/goods_footer_section.dart';

class GoodsvipView extends GetView<GoodsvipController> {
  const GoodsvipView({super.key});

  @override
  Widget build(BuildContext context) {
    final isDarkMode = Theme.of(context).brightness == Brightness.dark;

    return Scaffold(
      backgroundColor: isDarkMode ? Colors.black : Colors.grey[50],
      appBar: AppBar(
        backgroundColor: isDarkMode ? Colors.black : Colors.white,
        foregroundColor: Colors.white,
        elevation: 0.5,
        leading: IconButton(
          icon: Icon(
            Icons.arrow_back_ios,
            size: 20.sp,
            color: isDarkMode ? Colors.white : Colors.black87,
          ),
          onPressed: () => Get.back(),
        ),
        title: Text(
          _pageTitle,
          style: TextStyle(
            fontSize: 18.sp,
            fontWeight: FontWeight.w600,
            color: isDarkMode ? Colors.white : Colors.black,
          ),
        ),
        centerTitle: true,
      ),
      body: SafeArea(
        top: false,
        child: Obx(() {
          final userTick = User.refreshTick.value;
          Widget content;
          if (controller.loading.value) {
            content = const Center(child: CircularProgressIndicator());
          } else if (controller.error.isNotEmpty) {
            content = Center(child: Text(controller.error.value));
          } else {
            final focused = _tier != null;
            final source = focused
                ? controller.items.where(_matchesTier).toList()
                : controller.items
                    .where((g) => g.usagetype == UsageType.Vip)
                    .toList();
            final Map<UsageType, List<DBGoods>> grouped = {};
            for (final g in source) {
              grouped.putIfAbsent(g.usagetype, () => []).add(g);
            }
            // 会员页只放月 / 季 / 终生三档。点某一档进来时只留那一档。
            final order = [UsageType.Vip];
            final children = <Widget>[];
            if (!focused) {
              if (controller.vipExpiringSoon) {
                children.add(_buildWarnBanner(
                  isDarkMode,
                  'vipExpiringSoon'
                      .trParams({'days': '${controller.vipDaysLeft}'}),
                ));
                children.add(SizedBox(height: 12.h));
              }
              if (controller.computeLow) {
                children.add(_buildWarnBanner(isDarkMode, 'computeLow'.tr));
                children.add(SizedBox(height: 12.h));
              }
            }
            for (int i = 0; i < order.length; i++) {
              final t = order[i];
              final list = grouped[t];
              if (list == null || list.isEmpty) continue;
              children.add(_buildTypeSection(t, list, isDarkMode));
              if (i != order.length - 1) {
                children.add(SizedBox(height: 16.h));
                children.add(Divider(
                    color: isDarkMode ? Colors.white24 : Colors.black12));
                children.add(SizedBox(height: 16.h));
              }
            }

            if (!focused) {
              children.add(GoodsFooterSection(isDarkMode: isDarkMode));
            }
            content = ListView(
              key: ValueKey(userTick),
              padding: EdgeInsets.all(16.w),
              children: children,
            );
          }
          return Stack(
            children: [
              content,
              if (controller.isPaying.value)
                Positioned.fill(
                  child: AbsorbPointer(
                    absorbing: true,
                    child: Container(
                      color: Colors.black.withOpacity(0.35),
                      child: const Center(
                        child: CircularProgressIndicator(),
                      ),
                    ),
                  ),
                ),
            ],
          );
        }),
      ),
    );
  }

  /// 进页时记下的档位。不要改回读 Get.arguments。
  String? get _tier => controller.vipTier;

  String get _pageTitle {
    switch (_tier) {
      case 'month':
        return 'vipMonth'.tr;
      case 'quarter':
        return 'vipQuarter'.tr;
      case 'lifetime':
        return 'vipLifetime'.tr;
      default:
        return 'vipRecharge'.tr;
    }
  }

  /// 月度约 30 天、季度约 90 天、终生按一年以上。天数对不上时再看商品名。
  bool _matchesTier(DBGoods g) {
    if (g.usagetype != UsageType.Vip) return false;
    final tier = _tier;
    if (g.viptime > 0) {
      switch (tier) {
        case 'month':
          return g.viptime >= 28 && g.viptime <= 31;
        case 'quarter':
          return g.viptime >= 70 && g.viptime <= 120;
        case 'lifetime':
          return g.viptime >= 365;
      }
    }
    final blob = '${g.id} ${g.name} ${g.localname}'.toLowerCase();
    switch (tier) {
      case 'month':
        return blob.contains('month') || blob.contains('月度');
      case 'quarter':
        return blob.contains('quarter') || blob.contains('季');
      case 'lifetime':
        return blob.contains('life') || blob.contains('终');
      default:
        return false;
    }
  }

  /// 到期 / 算力不足的提示条。刻意做成温和的黄色而不是红色错误样式——
  /// 这是「该续费了」的提醒，不是故障；下面就是购买入口，不需要再额外引导。
  Widget _buildWarnBanner(bool isDarkMode, String text) {
    return Container(
      width: double.infinity,
      padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 12.h),
      decoration: BoxDecoration(
        color: isDarkMode ? const Color(0xFF3A2F16) : const Color(0xFFFFF7E6),
        borderRadius: BorderRadius.circular(12.r),
        border: Border.all(
          color: isDarkMode ? const Color(0xFF6B551F) : const Color(0xFFFFE0A3),
        ),
      ),
      child: Row(
        children: [
          Icon(Icons.info_outline,
              size: 18.sp,
              color: isDarkMode ? const Color(0xFFE0B860) : const Color(0xFFB7791F)),
          SizedBox(width: 10.w),
          Expanded(
            child: Text(
              text,
              style: TextStyle(
                fontSize: 13.sp,
                color: isDarkMode ? const Color(0xFFE8D5A8) : const Color(0xFF8A6116),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildTypeHeader(UsageType type, bool isDarkMode) {
    final titles = {
      UsageType.AI: 'aiFunction'.tr,
      UsageType.Meet: 'conferenceAssistant'.tr,
      UsageType.Translation: 'simultaneousTranslation'.tr,
      UsageType.Vip: 'memberService'.tr,
      UsageType.Compute: 'computePack'.tr,
    };
    final subColor = isDarkMode ? Colors.white70 : Colors.grey[700];
    String titleStr = titles[type] ?? type.name;
    String? vipSubtitle;
    if (type == UsageType.Compute) {
      // 算力包分区：副标题显示当前余额（服务端已把设备赠送与账户余额拆好）
      vipSubtitle = controller.computeSummary;
    }
    if (type == UsageType.Vip) {
      vipSubtitle = _vipExpiryLine(withDeviceSource: true);
    }
    return Container(
      padding: EdgeInsets.all(16.w),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.grey[900] : Colors.white,
        borderRadius: BorderRadius.circular(12.r),
        boxShadow: [
          BoxShadow(
            color: isDarkMode
                ? Colors.black.withOpacity(0.2)
                : Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Container(
          //   width: 44.w,
          //   height: 44.w,
          //   decoration: BoxDecoration(
          //     color: iconAndColor.background,
          //     borderRadius: BorderRadius.circular(22.r),
          //   ),
          //   child: Icon(iconAndColor.icon, color: iconAndColor.foreground),
          // ),
          // SizedBox(width: 12.w),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  titleStr,
                  style: TextStyle(
                    fontSize: 18.sp,
                    fontWeight: FontWeight.w700,
                    color: isDarkMode ? Colors.white : Colors.black,
                  ),
                ),
                SizedBox(height: 8.h),
                // 会员与算力（user_getcompute）：服务端已合并自购与设备赋予，这里只展示
                if (type == UsageType.Vip && controller.computeSummary != null) ...[
                  Text(
                    controller.computeSummary!,
                    style: TextStyle(fontSize: 12.sp, color: subColor),
                  ),
                  SizedBox(height: 4.h),
                ],
                if (type == UsageType.Vip && vipSubtitle != null)
                  Text(
                    vipSubtitle,
                    style: TextStyle(fontSize: 12.sp, color: subColor),
                  )
                else
                  _buildMetricsInline(type, isDarkMode),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildTypeSection(
      UsageType type, List<DBGoods> list, bool isDarkMode) {
    // 三档同页时，到期和算力写在各自的卡片里，不再在上面放一条共用的会员说明。
    if (type == UsageType.Vip && _tier == null) {
      return _buildGoodsGrid(list, type, isDarkMode);
    }
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _buildTypeHeader(type, isDarkMode),
        SizedBox(height: 8.h),
        _buildGoodsGrid(list, type, isDarkMode),
      ],
    );
  }

  Widget _buildMetricsInline(UsageType type, bool isDarkMode) {
    final textColor = isDarkMode ? Colors.white : Colors.black;
    final subColor = isDarkMode ? Colors.white70 : Colors.grey[700];
    if (type == UsageType.Vip) {
      int viplv = 0;
      if (User.isLoggedIn()) {
        viplv = User.instance.viplv;
      }
      return Row(
        children: [
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'Lv.$viplv',
                  style: TextStyle(
                    fontSize: 14.sp,
                    fontWeight: FontWeight.w600,
                    color: textColor,
                  ),
                ),
                SizedBox(height: 4.h),
                Text(
                  _vipExpiryLine(labelKey: 'validityPeriod'),
                  style: TextStyle(fontSize: 12.sp, color: subColor),
                ),
              ],
            ),
          ),
          // Container(
          //   padding: EdgeInsets.symmetric(horizontal: 10.w, vertical: 4.h),
          //   decoration: BoxDecoration(
          //     color: isDarkMode ? Colors.white10 : Colors.black12,
          //     borderRadius: BorderRadius.circular(16.r),
          //   ),
          //   child: Text(
          //     viplv > 0 ? 'enabled'.tr : 'disabled'.tr,
          //     style: TextStyle(fontSize: 11.sp, color: subColor),
          //   ),
          // ),
        ],
      );
    }

    int total = 0;
    int remain = 0;
    if (User.isLoggedIn()) {
      final u = User.instance;
      if (type == UsageType.AI) {
        total = u.aichattotalintegral;
        remain = u.aichatintegral;
      } else if (type == UsageType.Meet) {
        total = u.meettotalintegral;
        remain = u.meetintegral;
      } else if (type == UsageType.Translation) {
        total = u.tradetotalintegral;
        remain = u.tradeintegral;
      }
    }
    final progress = (total > 0) ? (remain / total).clamp(0.0, 1.0) : 0.0;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        LinearProgressIndicator(
          value: progress,
          minHeight: 8.h,
          backgroundColor: isDarkMode ? Colors.grey[800] : Colors.grey[300],
          valueColor: AlwaysStoppedAnimation<Color>(
              isDarkMode ? Colors.blue[300]! : Colors.blue[600]!),
        ),
        SizedBox(height: 8.h),
        Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Text(
              '${'totalQuota'.tr}：$total',
              style: TextStyle(fontSize: 12.sp, color: subColor),
            ),
            Text(
              '${'remaining'.tr}：$remain',
              style: TextStyle(fontSize: 12.sp, color: subColor),
            ),
          ],
        ),
      ],
    );
  }

  String? _tierKind(DBGoods g) {
    if (g.usagetype != UsageType.Vip) return null;
    if (g.viptime > 0) {
      if (g.viptime >= 28 && g.viptime <= 31) return 'month';
      if (g.viptime >= 70 && g.viptime <= 120) return 'quarter';
      if (g.viptime >= 365) return 'lifetime';
    }
    final blob = '${g.id} ${g.name} ${g.localname}'.toLowerCase();
    if (blob.contains('month') || blob.contains('月度')) return 'month';
    if (blob.contains('quarter') || blob.contains('季')) return 'quarter';
    if (blob.contains('life') || blob.contains('终')) return 'lifetime';
    return null;
  }

  Widget _buildGoodsGrid(List<DBGoods> list, UsageType type, bool isDarkMode) {
    if (type == UsageType.Vip && _tier == null) {
      final ordered = [...list]..sort((a, b) {
          int rank(DBGoods g) {
            switch (_tierKind(g)) {
              case 'month':
                return 0;
              case 'quarter':
                return 1;
              case 'lifetime':
                return 2;
              default:
                return 3;
            }
          }

          return rank(a).compareTo(rank(b));
        });
      return Column(
        children: [
          for (final item in ordered) ...[
            _buildVipOfferCard(item, isDarkMode),
            SizedBox(height: 12.h),
          ],
        ],
      );
    }
    return GridView.builder(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: _tier != null ? 1 : 2,
        mainAxisSpacing: 8.h,
        crossAxisSpacing: 12.w,
        childAspectRatio: _tier != null ? 2.8 : 1.3,
      ),
      itemCount: list.length,
      itemBuilder: (_, i) => _buildGridItemCard(list[i], type, isDarkMode),
    );
  }

  Widget _buildVipOfferCard(DBGoods item, bool isDarkMode) {
    final kind = _tierKind(item) ?? '';
    final price = goodsDisplayPrice(item);
    final title = vipOfferTitle(kind, price);
    final zh = (Get.locale?.languageCode ?? 'zh') == 'zh';
    final facts = vipOfferFacts(item);
    final subColor = isDarkMode ? Colors.white70 : Colors.grey[700];
    return Container(
      width: double.infinity,
      padding: EdgeInsets.all(16.w),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.grey[900] : Colors.white,
        borderRadius: BorderRadius.circular(12.r),
        boxShadow: [
          BoxShadow(
            color: isDarkMode
                ? Colors.black.withOpacity(0.2)
                : Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            title,
            style: TextStyle(
              fontSize: 17.sp,
              fontWeight: FontWeight.w700,
              color: isDarkMode ? Colors.white : Colors.black,
            ),
          ),
          SizedBox(height: 10.h),
          Text(
            zh ? '会员服务说明' : 'Membership details',
            style: TextStyle(
              fontSize: 13.sp,
              fontWeight: FontWeight.w600,
              color: isDarkMode ? Colors.white : Colors.black87,
            ),
          ),
          SizedBox(height: 6.h),
          for (final line in facts)
            Padding(
              padding: EdgeInsets.only(bottom: 4.h),
              child: Text(
                line,
                style: TextStyle(fontSize: 14.sp, height: 1.4, color: subColor),
              ),
            ),
          SizedBox(height: 12.h),
          Align(
            alignment: Alignment.centerRight,
            child: GestureDetector(
              onTap: () => controller.purchase(item),
              child: Container(
                padding: EdgeInsets.symmetric(horizontal: 14.w, vertical: 8.h),
                decoration: BoxDecoration(
                  color: Colors.blue[600],
                  borderRadius: BorderRadius.circular(8.r),
                ),
                child: Text(
                  'purchase'.tr,
                  style: TextStyle(fontSize: 13.sp, color: Colors.white),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildGridItemCard(DBGoods item, UsageType type, bool isDarkMode) {
    final iconColors = _iconColorForType(type, isDarkMode);
    return Container(
      padding: EdgeInsets.all(12.w),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.grey[900] : Colors.white,
        borderRadius: BorderRadius.circular(12.r),
        boxShadow: [
          BoxShadow(
            color: isDarkMode
                ? Colors.black.withOpacity(0.2)
                : Colors.black.withOpacity(0.05),
            blurRadius: 10,
            offset: const Offset(0, 2),
          ),
        ],
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Container(
                width: 34.w,
                height: 20.w,
                decoration: BoxDecoration(
                  color: iconColors.background,
                  borderRadius: BorderRadius.circular(17.r),
                ),
                child: Icon(iconColors.icon, color: iconColors.foreground),
              ),
              SizedBox(width: 8.w),
              Expanded(
                child: Text(
                  goodsDisplayPrice(item),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: TextStyle(
                    fontSize: 21.sp,
                    fontWeight: FontWeight.w600,
                    color: isDarkMode ? Colors.white : Colors.black,
                  ),
                ),
              ),
            ],
          ),
          SizedBox(height: 6.h),
          Expanded(
            child: Text(
              localizedGoodsName(item),
              maxLines: 3,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(
                fontSize: 15.sp,
                color: isDarkMode ? Colors.white70 : Colors.grey[700],
              ),
            ),
          ),
          // SizedBox(height: 6.h),
          Row(
            mainAxisAlignment: MainAxisAlignment.end,
            children: [
              GestureDetector(
                onTap: () => controller.purchase(item),
                child: Container(
                  padding:
                      EdgeInsets.symmetric(horizontal: 10.w, vertical: 6.h),
                  decoration: BoxDecoration(
                    color: Colors.blue[600],
                    borderRadius: BorderRadius.circular(8.r),
                  ),
                  child: Text(
                    'purchase'.tr,
                    style: TextStyle(fontSize: 12.sp, color: Colors.white),
                  ),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  DateTime? _parseVipExpiry() {
    if (!User.isLoggedIn()) return null;
    var ts = User.instance.vipexptime;
    final computeVip = controller.compute.value?['vip'];
    if (computeVip is Map) {
      final exp = (computeVip['exptime'] as num?)?.toInt() ?? 0;
      if (exp > 0) ts = exp;
    }
    if (ts <= 0) return null;
    final expiry = ts > 1000000000000
        ? DateTime.fromMillisecondsSinceEpoch(ts)
        : DateTime.fromMillisecondsSinceEpoch(ts * 1000);
    if (!expiry.isAfter(DateTime.now())) return null;
    return expiry;
  }

  /// 当前有效 VIP 按剩余天数分档：月度约 30 天，季度约 90 天，一年及以上当终生。
  String? _activeVipTier(DateTime expiry) {
    final days = expiry.difference(DateTime.now()).inDays;
    if (days >= 300) return 'lifetime';
    if (days >= 60) return 'quarter';
    if (days > 0) return 'month';
    return null;
  }

  /// 月度 / 季度页只显示对应档位的到期日，避免三条入口共用一条 vipexptime。
  /// 终生不展示具体日期，固定为无限。
  String _vipExpiryLine({
    String labelKey = 'expiryLabel',
    bool withDeviceSource = false,
  }) {
    final suffix = withDeviceSource && controller.vipFromDevice
        ? ' · ${'vipFromDevice'.tr}'
        : '';
    if (_tier == 'lifetime') {
      return '${labelKey.tr}${'unlimited'.tr}$suffix';
    }
    final expiry = _parseVipExpiry();
    if (expiry == null) return 'notActivated'.tr;
    final kind = _activeVipTier(expiry);
    if (kind == 'lifetime') {
      return '${labelKey.tr}${'unlimited'.tr}$suffix';
    }
    if (_tier != null && kind != _tier) {
      return 'notActivated'.tr;
    }
    return '${labelKey.tr}${_fmtDate(expiry)}$suffix';
  }

  String _fmtDate(DateTime d) {
    final y = d.year.toString().padLeft(4, '0');
    final m = d.month.toString().padLeft(2, '0');
    final day = d.day.toString().padLeft(2, '0');
    return '$y-$m-$day';
  }

  _IconColors _iconColorForType(UsageType type, bool isDarkMode) {
    switch (type) {
      case UsageType.AI:
        return _IconColors(
          icon: Icons.smart_toy,
          background: isDarkMode
              ? Colors.teal[900]!.withOpacity(0.3)
              : Colors.teal[100]!,
          foreground: isDarkMode ? Colors.teal[300]! : Colors.teal[600]!,
        );
      case UsageType.Meet:
        return _IconColors(
          icon: Icons.people_alt,
          background: isDarkMode
              ? Colors.pink[900]!.withOpacity(0.3)
              : Colors.pink[100]!,
          foreground: isDarkMode ? Colors.pink[300]! : Colors.pink[600]!,
        );
      case UsageType.Translation:
        return _IconColors(
          icon: Icons.translate,
          background: isDarkMode
              ? Colors.indigo[900]!.withOpacity(0.3)
              : Colors.indigo[100]!,
          foreground: isDarkMode ? Colors.indigo[300]! : Colors.indigo[600]!,
        );
      case UsageType.Compute:
        return _IconColors(
          icon: Icons.bolt,
          background: isDarkMode
              ? Colors.amber[900]!.withOpacity(0.3)
              : Colors.amber[100]!,
          foreground: isDarkMode ? Colors.amber[300]! : Colors.amber[700]!,
        );
      case UsageType.Vip:
      case UsageType.UsageNull:
        return _IconColors(
          icon: Icons.workspace_premium,
          background: isDarkMode
              ? Colors.amber[900]!.withOpacity(0.3)
              : Colors.amber[100]!,
          foreground: isDarkMode ? Colors.amber[300]! : Colors.amber[600]!,
        );
    }
  }

}

class _IconColors {
  final IconData icon;
  final Color background;
  final Color foreground;
  const _IconColors({
    required this.icon,
    required this.background,
    required this.foreground,
  });
}