import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:voitrans/data/models/goods.dart';
import '../../../data/models/user_Info.dart';
import '../controllers/goodstrade_controller.dart';

class GoodstradeView extends GetView<GoodstradeController> {
  const GoodstradeView({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,
        elevation: 0.5,
        title: Text(
          'simultaneousTranslation'.tr,
          style: TextStyle(
            fontSize: 18.sp,
            fontWeight: FontWeight.w600,
            color: isDarkMode ? Colors.white : Colors.black,
          ),
        ),
        centerTitle: true,
      ),
      body: Obx(() {
        // 访问刷新信号以建立依赖关系：用户信息变化时触发重建
        final _ = User.refreshTick.value;
        if (controller.loading.value) {
          return const Center(child: CircularProgressIndicator());
        }
        if (controller.error.isNotEmpty) {
          return Center(child: Text(controller.error.value));
        }
        return ListView.separated(
          padding: EdgeInsets.all(16.w),
          itemCount: controller.items.length + 4,
          separatorBuilder: (_, __) => SizedBox(height: 12.h),
          itemBuilder: (_, index) {
            if (index == 0) {
              return _buildHeader(isDarkMode);
            }
            if (index == 1) {
              return _buildUsageCard(isDarkMode);
            }
            final itemIndex = index - 2;
            if (itemIndex < controller.items.length) {
              final item = controller.items[itemIndex];
              return _buildCard(item, isDarkMode);
            }
            if (index == controller.items.length + 2) {
              return _buildFeaturesSection(isDarkMode);
            }
            return _buildFooterSection(isDarkMode);
          },
        );
      }),
    );
  }

  Widget _buildHeader(bool isDarkMode) {
    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: isDarkMode
                  ? Colors.indigo[900]!.withOpacity(0.3)
                  : Colors.indigo[100]!,
              borderRadius: BorderRadius.circular(22.r),
            ),
            child: Icon(Icons.translate,
                color: isDarkMode ? Colors.indigo[300]! : Colors.indigo[600]!),
          ),
          SizedBox(width: 12.w),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  '翻译功能',
                  style: TextStyle(
                    fontSize: 18.sp,
                    fontWeight: FontWeight.w700,
                    color: isDarkMode ? Colors.white : Colors.black,
                  ),
                ),
                SizedBox(height: 6.h),
                Text(
                  '多语种实时同传与文本翻译，低延时语音播报。',
                  style: TextStyle(
                    fontSize: 12.sp,
                    color: isDarkMode ? Colors.white70 : Colors.grey[700],
                  ),
                ),
                SizedBox(height: 4.h),
                Text(
                  '适用于出行、商务、演讲与教学等场景。',
                  style: TextStyle(
                    fontSize: 12.sp,
                    color: isDarkMode ? Colors.white70 : Colors.grey[700],
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildUsageCard(bool isDarkMode) {
    int totalAi = 0;
    int remainAi = 0;
    if (User.isLoggedIn()) {
      final u = User.instance;
      totalAi = u.tradetotaltime;
      remainAi = u.tradetime;
    }
    final progress = (totalAi > 0) ? (remainAi / totalAi).clamp(0.0, 1.0) : 0.0;

    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: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Icon(Icons.timeline,
                  color: isDarkMode ? Colors.blue[300]! : Colors.blue[600]!),
              SizedBox(width: 8.w),
              Text(
                '剩余额度',
                style: TextStyle(
                  fontSize: 16.sp,
                  fontWeight: FontWeight.w600,
                  color: isDarkMode ? Colors.white : Colors.black,
                ),
              ),
            ],
          ),
          SizedBox(height: 12.h),
          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(
                '总次数：$totalAi',
                style: TextStyle(
                  fontSize: 12.sp,
                  color: isDarkMode ? Colors.white70 : Colors.grey[700],
                ),
              ),
              Text(
                '剩余：$remainAi',
                style: TextStyle(
                  fontSize: 12.sp,
                  color: isDarkMode ? Colors.white70 : Colors.grey[700],
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildCard(DBGoods item, bool isDarkMode) {
    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(
        children: [
          Container(
            width: 42.w,
            height: 42.w,
            decoration: BoxDecoration(
              color: isDarkMode
                  ? Colors.indigo[900]!.withOpacity(0.3)
                  : Colors.indigo[100]!,
              borderRadius: BorderRadius.circular(21.r),
            ),
            child: Icon(Icons.translate,
                color: isDarkMode ? Colors.indigo[300]! : Colors.indigo[600]!),
          ),
          SizedBox(width: 12.w),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(item.name,
                    style: TextStyle(
                      fontSize: 16.sp,
                      fontWeight: FontWeight.w600,
                      color: isDarkMode ? Colors.white : Colors.black,
                    )),
                SizedBox(height: 4.h),
                Text(item.desc,
                    style: TextStyle(
                      fontSize: 12.sp,
                      color: isDarkMode ? Colors.white70 : Colors.grey[600],
                    )),
              ],
            ),
          ),
          Column(
            crossAxisAlignment: CrossAxisAlignment.end,
            children: [
              Text('¥${item.price.toStringAsFixed(2)}',
                  style: TextStyle(
                    fontSize: 16.sp,
                    fontWeight: FontWeight.w600,
                    color: isDarkMode ? Colors.white : Colors.black,
                  )),
              SizedBox(height: 8.h),
              GestureDetector(
                onTap: () => controller.purchase(item),
                child: Container(
                  padding:
                      EdgeInsets.symmetric(horizontal: 12.w, vertical: 6.h),
                  decoration: BoxDecoration(
                    color: Colors.blue[600],
                    borderRadius: BorderRadius.circular(20.r),
                  ),
                  child: Text(
                    '购买',
                    style: TextStyle(fontSize: 12.sp, color: Colors.white),
                  ),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildFeaturesSection(bool isDarkMode) {
    final textColor = isDarkMode ? Colors.white : Colors.black;
    final subColor = isDarkMode ? Colors.white70 : Colors.grey[700];
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          '功能说明',
          style: TextStyle(
            fontSize: 16.sp,
            fontWeight: FontWeight.w600,
            color: textColor,
          ),
        ),
        SizedBox(height: 10.h),
        Wrap(
          spacing: 12.w,
          runSpacing: 12.h,
          alignment: WrapAlignment.start,
          crossAxisAlignment: WrapCrossAlignment.start,
          children: [
            _buildFeatureCard(
              isDarkMode,
              icon: Icons.translate,
              title: '实时同传',
              lines: ['中英互译', '低延时语音播报'],
              colorSeed: Colors.indigo,
            ),
            _buildFeatureCard(
              isDarkMode,
              icon: Icons.text_snippet,
              title: '文本翻译',
              lines: ['多语种文本翻译', '术语优化与语境保持'],
              colorSeed: Colors.blue,
            ),
            _buildFeatureCard(
              isDarkMode,
              icon: Icons.library_books,
              title: '场景词库',
              lines: ['旅游/商务/生活词库', '专属词汇记忆'],
              colorSeed: Colors.teal,
            ),
            _buildFeatureCard(
              isDarkMode,
              icon: Icons.subtitles,
              title: '字幕显示',
              lines: ['对话字幕/大字模式', '颜色高对比度'],
              colorSeed: Colors.purple,
            ),
          ],
        ),
        SizedBox(height: 12.h),
        Text(
          '翻译效果受麦克风、网络时延与环境噪声影响，具体以实际表现为准。',
          style: TextStyle(fontSize: 12.sp, color: subColor),
        ),
      ],
    );
  }

  Widget _buildFeatureCard(
    bool isDarkMode, {
    required IconData icon,
    required String title,
    required List<String> lines,
    required MaterialColor colorSeed,
  }) {
    final bgColor = isDarkMode ? Colors.grey[900] : Colors.white;
    final mainColor = isDarkMode ? colorSeed[300]! : colorSeed[600]!;
    final subColor = isDarkMode ? Colors.white70 : Colors.grey[700];
    final width = (Get.width - 16.w * 2 - 12.w) / 2;
    return Container(
      width: width,
      padding: EdgeInsets.all(12.w),
      decoration: BoxDecoration(
        color: bgColor,
        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: 36.w,
                height: 36.w,
                decoration: BoxDecoration(
                  color: isDarkMode
                      ? mainColor.withOpacity(0.25)
                      : mainColor.withOpacity(0.15),
                  borderRadius: BorderRadius.circular(18.r),
                ),
                child: Icon(icon, color: mainColor),
              ),
              SizedBox(width: 8.w),
              Expanded(
                child: Text(
                  title,
                  style: TextStyle(
                    fontSize: 14.sp,
                    fontWeight: FontWeight.w600,
                    color: isDarkMode ? Colors.white : Colors.black,
                  ),
                ),
              ),
            ],
          ),
          SizedBox(height: 8.h),
          ...lines.map((l) => Padding(
                padding: EdgeInsets.only(bottom: 4.h),
                child:
                    Text(l, style: TextStyle(fontSize: 12.sp, color: subColor)),
              )),
        ],
      ),
    );
  }

  Widget _buildFooterSection(bool isDarkMode) {
    final subColor = isDarkMode ? Colors.white60 : Colors.grey[600];
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 12.h),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.center,
        children: [
          SizedBox(
            width: double.infinity,
            child: Divider(color: isDarkMode ? Colors.white24 : Colors.black12),
          ),
          SizedBox(height: 8.h),
          Text(
            '应用名称：VoiTrans · 服务提供：VoiTrans',
            textAlign: TextAlign.center,
            style: TextStyle(fontSize: 11.sp, color: subColor),
          ),
          SizedBox(height: 4.h),
          Text(
            '更多信息请前往 设置 > 关于 查看',
            textAlign: TextAlign.center,
            style: TextStyle(fontSize: 11.sp, color: subColor),
          ),
          SizedBox(height: 4.h),
          Text(
            '© 2025 VoiTrans',
            textAlign: TextAlign.center,
            style: TextStyle(fontSize: 11.sp, color: subColor),
          ),
        ],
      ),
    );
  }
}