import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import '../controllers/pairing_controller.dart';
import '../../../core/widgets/common_bottom_nav.dart';
import '../../../core/themes/app_theme.dart';
import 'package:permission_handler/permission_handler.dart';

class PairingView extends GetView<PairingController> {
  const PairingView({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final bool isDarkMode = Theme.of(context).brightness == Brightness.dark;
    
    return Scaffold(
      backgroundColor: isDarkMode ? Colors.black : Colors.white,
      body: SafeArea(
        child: Stack(
          children: [
            // 主要内容
            _buildMainContent(isDarkMode),
          ],
        ),
      ),
      bottomNavigationBar: Opacity(
        opacity: 0.5, // 保持半透明效果
        child: const CommonBottomNav(currentIndex: 0),
      ),
    );
  }

  // 主要内容
  Widget _buildMainContent(bool isDarkMode) {
    return Padding(
      padding: EdgeInsets.fromLTRB(24.w, 40.h, 24.w, 24.h),
      child: SingleChildScrollView(
        child: Column(
          children: [
            // 标题部分
            _buildHeader(isDarkMode),
            
            // 设备动画
            SizedBox(height: 40.h),
            _buildDeviceAnimation(),
            
            // 搜索状态
            SizedBox(height: 40.h),
            _buildSearchStatus(isDarkMode),
            
            // 底部按钮
            SizedBox(height: 60.h),
            _buildBottomButtons(isDarkMode),
            SizedBox(height: 80.h), // 留出底部导航的空间
          ],
        ),
      ),
    );
  }

  // 标题部分
  Widget _buildHeader(bool isDarkMode) {
    return Column(
      children: [
        Text(
          'DeepVoice',
          style: TextStyle(
            fontSize: 24.sp,
            fontWeight: FontWeight.bold,
            color: isDarkMode ? Colors.white : Colors.black,
          ),
        ),
        SizedBox(height: 8.h),
        Text(
          '连接世界，超越声音',
          style: TextStyle(
            fontSize: 14.sp,
            color: isDarkMode ? Colors.white70 : Colors.black54,
          ),
        ),
      ],
    );
  }

  // 设备动画
  Widget _buildDeviceAnimation() {
    return SizedBox(
      width: 240.w,
      height: 240.w,
      child: Stack(
        alignment: Alignment.center,
        children: [
          // 脉动动画背景
          _buildPulseBackground(),
          
          // 耳机图片
          _buildHeadphoneImage(),
          
          // 旋转加载指示器
          _buildLoadingIndicator(),
        ],
      ),
    );
  }

  // 脉动背景
  Widget _buildPulseBackground() {
    return TweenAnimationBuilder<double>(
      tween: Tween<double>(begin: 0.8, end: 1.1),
      duration: const Duration(seconds: 2),
      curve: Curves.easeInOut,
      builder: (context, value, child) {
        return Transform.scale(
          scale: value,
          child: Container(
            width: 200.w,
            height: 200.w,
            decoration: BoxDecoration(
              gradient: LinearGradient(
                begin: Alignment.topLeft,
                end: Alignment.bottomRight,
                colors: [
                  const Color(0xFF0066CC).withOpacity(0.2),
                  const Color(0xFF5E5CE6).withOpacity(0.2),
                ],
              ),
              shape: BoxShape.circle,
            ),
          ),
        );
      },
    );
  }

  // 耳机图片
  Widget _buildHeadphoneImage() {
    return Container(
      width: 140.w,
      height: 140.w,
      decoration: BoxDecoration(
        gradient: const LinearGradient(
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
          colors: [
            Color(0xFF0066CC),
            Color(0xFF5E5CE6),
          ],
        ),
        shape: BoxShape.circle,
      ),
      child: Icon(
        Icons.headset,
        size: 80.sp,
        color: Colors.white,
      ),
    );
  }

  // 加载指示器
  Widget _buildLoadingIndicator() {
    return SizedBox(
      width: 180.w,
      height: 180.w,
      child: CircularProgressIndicator(
        strokeWidth: 4.w,
        valueColor: const AlwaysStoppedAnimation<Color>(Color(0xFF0066CC)),
        backgroundColor: const Color(0xFF0066CC).withOpacity(0.1),
      ),
    );
  }

  // 搜索状态
  Widget _buildSearchStatus(bool isDarkMode) {
    return Obx(() {
      final String status = controller.statusDescription;
      final bool hasDevice = controller.deviceInfo.isNotEmpty && controller.deviceInfo['device'] != null;
      final bool hasError = controller.errorMessage.isNotEmpty;
      
      // 已找到设备
      if (hasDevice) {
        return Column(
          children: [
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(Icons.check_circle, color: Colors.green, size: 20.sp),
                SizedBox(width: 8.w),
                Text(
                  '设备信息获取成功',
                  style: TextStyle(
                    fontSize: 18.sp,
                    fontWeight: FontWeight.w600,
                    color: Colors.green,
                  ),
                ),
              ],
            ),
            SizedBox(height: 8.h),
            Text(
              '正在跳转到主页...',
              style: TextStyle(
                fontSize: 14.sp,
                color: isDarkMode ? Colors.white70 : Colors.black54,
              ),
            ),
          ],
        );
      }
      
      // 有错误信息
      if (hasError) {
        // 蓝牙关闭错误
        if (status.contains('蓝牙已关闭')) {
          return Column(
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Icon(Icons.bluetooth_disabled, color: Colors.orange, size: 20.sp),
                  SizedBox(width: 8.w),
                  Text(
                    '蓝牙已关闭',
                    style: TextStyle(
                      fontSize: 18.sp,
                      fontWeight: FontWeight.w600,
                      color: Colors.orange,
                    ),
                  ),
                ],
              ),
              SizedBox(height: 8.h),
              Text(
                controller.errorMessage,
                style: TextStyle(
                  fontSize: 14.sp,
                  color: isDarkMode ? Colors.white70 : Colors.black54,
                ),
                textAlign: TextAlign.center,
              ),
            ],
          );
        }
        
        // 权限错误
        if (status.contains('权限')) {
          return Column(
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  Icon(Icons.no_encryption, color: Colors.orange, size: 20.sp),
                  SizedBox(width: 8.w),
                  Text(
                    '缺少必要权限',
                    style: TextStyle(
                      fontSize: 18.sp,
                      fontWeight: FontWeight.w600,
                      color: Colors.orange,
                    ),
                  ),
                ],
              ),
              SizedBox(height: 8.h),
              Text(
                controller.errorMessage,
                style: TextStyle(
                  fontSize: 14.sp,
                  color: isDarkMode ? Colors.white70 : Colors.black54,
                ),
                textAlign: TextAlign.center,
              ),
              SizedBox(height: 16.h),
              ElevatedButton(
                onPressed: () => openAppSettings(),
                style: ElevatedButton.styleFrom(
                  backgroundColor: Colors.orange,
                  foregroundColor: Colors.white,
                  padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(8.r),
                  ),
                ),
                child: const Text('打开设置'),
              ),
            ],
          );
        }
        
        // 其他错误
        return Column(
          children: [
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Icon(Icons.error, color: Colors.red, size: 20.sp),
                SizedBox(width: 8.w),
                Text(
                  status.isEmpty ? '未找到设备' : status,
                  style: TextStyle(
                    fontSize: 18.sp,
                    fontWeight: FontWeight.w600,
                    color: Colors.red,
                  ),
                ),
              ],
            ),
            SizedBox(height: 8.h),
            Text(
              controller.errorMessage.isEmpty ? 
                '请确保耳机已开机并在附近' : controller.errorMessage,
              style: TextStyle(
                fontSize: 14.sp,
                color: isDarkMode ? Colors.white70 : Colors.black54,
              ),
              textAlign: TextAlign.center,
            ),
          ],
        );
      }
      
      // 默认状态（正在搜索/初始化）
      return Column(
        children: [
          Text(
            status,
            style: TextStyle(
              fontSize: 18.sp,
              fontWeight: FontWeight.w600,
              color: isDarkMode ? Colors.white : Colors.black,
            ),
          ),
          SizedBox(height: 8.h),
          Text(
            '请打开耳机充电盒，将耳机放入您的耳朵',
            style: TextStyle(
              fontSize: 14.sp,
              color: isDarkMode ? Colors.white70 : Colors.black54,
            ),
          ),
        ],
      );
    });
  }

  // 底部按钮
  Widget _buildBottomButtons(bool isDarkMode) {
    return Column(
      children: [
        SizedBox(
          width: double.infinity,
          child: ElevatedButton(
            onPressed: controller.refreshSearch,
            style: ElevatedButton.styleFrom(
              backgroundColor: isDarkMode ? Color(0xFF1A1A1A) : Colors.grey.withOpacity(0.1),
              foregroundColor: isDarkMode ? Colors.white : Colors.black,
              padding: EdgeInsets.symmetric(vertical: 16.h),
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(16.r),
              ),
              elevation: 0,
            ),
            child: Text(
              '刷新搜索',
              style: TextStyle(
                fontSize: 16.sp,
                fontWeight: FontWeight.w500,
              ),
            ),
          ),
        ),
        SizedBox(height: 12.h),
        SizedBox(
          width: double.infinity,
          child: TextButton(
            onPressed: controller.skipConnecting,
            style: TextButton.styleFrom(
              foregroundColor: const Color(0xFF0066CC),
              padding: EdgeInsets.symmetric(vertical: 12.h),
            ),
            child: Text(
              '稍后再说',
              style: TextStyle(
                fontSize: 16.sp,
                fontWeight: FontWeight.w500,
              ),
            ),
          ),
        ),
      ],
    );
  }
}