import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'dart:ui';
import 'dart:io' show Platform;

import '../controllers/permissions_controller.dart';
import '../models/permission_group.dart';

class PermissionsView extends GetView<PermissionsController> {
  const PermissionsView({Key? key}) : super(key: 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,
        leading: IconButton(
          icon: Icon(
            Icons.arrow_back_ios,
            size: 20.w,
            color: isDarkMode ? Colors.white : Colors.black87,
          ),
          onPressed: () => Get.back(),
        ),
        title: Text(
          'permissionManagement'.tr,
          style: TextStyle(
            fontSize: 17.sp,
            fontWeight: FontWeight.w600,
            color: isDarkMode ? Colors.white : Colors.black,
          ),
        ),
        centerTitle: true,
      ),
      body: SafeArea(
        top: false,
        child: Obx(() {
          if (controller.permissionStatuses.isEmpty) {
            return const Center(child: CircularProgressIndicator());
          }

          return RefreshIndicator(
            onRefresh: controller.checkAllPermissions,
            child: SingleChildScrollView(
              padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 16.h),
              child: _buildPermissionGroups(isDarkMode),
            ),
          );
        }),
      ),
    );
  }

  Widget _buildPermissionGroups(bool isDarkMode) {
    return FutureBuilder<List<PermissionGroupModel>>(
      future: PermissionGroup.getPlatformGroups(),
      builder: (context, snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return const Center(child: CircularProgressIndicator());
        }

        if (snapshot.hasError) {
          return Center(child: Text('加载权限组失败: ${snapshot.error}'));
        }

        final groups = snapshot.data ?? [];
        final List<Widget> widgets = [];

        // 添加后台权限条目到最前端（仅在满足条件时）
        final backgroundPermissionWidget = _buildBackgroundPermissionSection(isDarkMode);
        if (backgroundPermissionWidget is! SizedBox) {
          widgets.add(backgroundPermissionWidget);
          if (groups.isNotEmpty) {
            widgets.add(SizedBox(height: 20.h));
          }
        }

        for (int i = 0; i < groups.length; i++) {
          final group = groups[i];

          // 过滤平台特定权限
          if (_shouldShowGroup(group)) {
            widgets.add(_buildPermissionSection(
              group.titleKey,
              group.icon,
              group.permissions,
              controller.permissionStatuses,
              isDarkMode,
            ));

            if (i < groups.length - 1) {
              widgets.add(SizedBox(height: 20.h));
            }
          }
        }

        return Column(children: widgets);
      },
    );
  }

  bool _shouldShowGroup(PermissionGroupModel group) {
    // Android特定权限组
    if (group.titleKey == 'communicationPermissions' ||
        group.titleKey == 'alarmPermissions') {
      return Platform.isAndroid;
    }
    // 蓝牙权限组：Android 12+才显示，iOS不显示
    if (group.titleKey == 'bluetoothPermissions') {
      if (Platform.isAndroid) {
        return controller.shouldShowBluetoothPermissions();
      }
      return false;
    }
    // 存储权限组：Android 10及以下版本或iOS才显示
    if (group.titleKey == 'storagePermissions') {
      return controller.shouldShowStoragePermissions();
    }
    // 通知权限和麦克风权限在所有平台显示
    if (group.titleKey == 'notificationPermissions' ||
        group.titleKey == 'microphonePermissions') {
      return true;
    }
    return true;
  }

  Widget _buildPermissionSection(
    String titleKey,
    IconData icon,
    List<Permission> permissions,
    Map<Permission, PermissionStatus> statuses,
    bool isDarkMode,
  ) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        // 组标题
        Padding(
          padding: EdgeInsets.only(left: 4.w, bottom: 8.h),
          child: Text(
            titleKey.tr,
            style: TextStyle(
              fontSize: 12.sp,
              fontWeight: FontWeight.w500,
              color: isDarkMode ? Colors.blue[400] : Colors.blue[600],
              letterSpacing: 1,
            ),
          ),
        ),

        // 权限项容器
        Container(
          decoration: BoxDecoration(
            color: isDarkMode ? Colors.white.withOpacity(0.05) : Colors.white,
            borderRadius: BorderRadius.circular(16.r),
            boxShadow: [
              BoxShadow(
                color: isDarkMode
                    ? Colors.black.withOpacity(0.2)
                    : Colors.black.withOpacity(0.05),
                blurRadius: 10,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: ClipRRect(
            borderRadius: BorderRadius.circular(16.r),
            child: BackdropFilter(
              filter: isDarkMode
                  ? ImageFilter.blur(sigmaX: 5, sigmaY: 5)
                  : ImageFilter.blur(sigmaX: 0, sigmaY: 0),
              child: Column(
                children:
                    _buildPermissionItems(permissions, statuses, isDarkMode),
              ),
            ),
          ),
        ),
      ],
    );
  }

  List<Widget> _buildPermissionItems(
    List<Permission> permissions,
    Map<Permission, PermissionStatus> statuses,
    bool isDarkMode,
  ) {
    final List<Widget> items = [];

    for (int i = 0; i < permissions.length; i++) {
      final permission = permissions[i];
      final status = statuses[permission] ?? PermissionStatus.denied;

      items.add(
        _buildPermissionItem(
          permission: permission,
          status: status,
          isDarkMode: isDarkMode,
        ),
      );

      // 添加分隔线，最后一个不加
      if (i < permissions.length - 1) {
        items.add(Divider(
          height: 1,
          color: isDarkMode ? Colors.white.withOpacity(0.1) : Colors.grey[200],
        ));
      }
    }

    return items;
  }

  Widget _buildPermissionItem({
    required Permission permission,
    required PermissionStatus status,
    required bool isDarkMode,
  }) {
    return Padding(
      padding: EdgeInsets.all(16.w),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  controller.getPermissionName(permission),
                  style: TextStyle(
                    fontSize: 16.sp,
                    fontWeight: FontWeight.w500,
                    color: isDarkMode ? Colors.white : Colors.black87,
                  ),
                ),
                SizedBox(height: 4.h),
                Text(
                  controller.getPermissionDescription(permission),
                  style: TextStyle(
                    fontSize: 12.sp,
                    color: isDarkMode ? Colors.white70 : Colors.grey[600],
                  ),
                ),
                SizedBox(height: 4.h),
                _buildStatusText(status, isDarkMode),
              ],
            ),
          ),
          Obx(() => Switch(
                value: status.isGranted,
                onChanged: controller.isRequestingPermission.value
                    ? null
                    : (value) =>
                        _handlePermissionToggle(permission, status, value),
                activeColor: Colors.blue[600],
              )),
        ],
      ),
    );
  }

  Widget _buildStatusText(PermissionStatus status, bool isDarkMode) {
    String text;
    Color color;

    if (status.isGranted) {
      text = 'authorized'.tr;
      color = Colors.green;
    } else if (status.isDenied) {
      text = 'unauthorized'.tr;
      color = Colors.red;
    } else if (status.isPermanentlyDenied) {
      text = 'needOpenInSystemSettings'.tr;
      color = Colors.orange;
    } else if (status.isLimited) {
      text = 'partialAuthorization'.tr;
      color = Colors.orange;
    } else {
      text = 'unknownStatus'.tr;
      color = Colors.grey;
    }

    return Text(
      text,
      style: TextStyle(
        color: color,
        fontSize: 12.sp,
        fontWeight: FontWeight.w500,
      ),
    );
  }

  /// 构建后台权限条目
  Widget _buildBackgroundPermissionSection(bool isDarkMode) {
    // 检查是否为Android系统且语言为中文
    if (!_shouldShowBackgroundPermissionTutorial()) {
      return const SizedBox.shrink(); // 不满足条件时完全隐藏
    }

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        // 组标题
        Padding(
          padding: EdgeInsets.only(left: 4.w, bottom: 8.h),
          child: Text(
            '后台权限'.tr, // 后台权限
            style: TextStyle(
              fontSize: 12.sp,
              fontWeight: FontWeight.w500,
              color: isDarkMode ? Colors.blue[400] : Colors.blue[600],
              letterSpacing: 1,
            ),
          ),
        ),

        // 权限项容器
        Container(
          decoration: BoxDecoration(
            color: isDarkMode ? Colors.white.withOpacity(0.05) : Colors.white,
            borderRadius: BorderRadius.circular(16.r),
            boxShadow: [
              BoxShadow(
                color: isDarkMode
                    ? Colors.black.withOpacity(0.2)
                    : Colors.black.withOpacity(0.05),
                blurRadius: 10,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: ClipRRect(
            borderRadius: BorderRadius.circular(16.r),
            child: BackdropFilter(
              filter: isDarkMode
                  ? ImageFilter.blur(sigmaX: 5, sigmaY: 5)
                  : ImageFilter.blur(sigmaX: 0, sigmaY: 0),
              child: _buildBackgroundPermissionItem(isDarkMode),
            ),
          ),
        ),
      ],
    );
  }

  /// 检查是否应该显示后台权限教程入口
  /// 仅在Android系统且中文环境下显示
  bool _shouldShowBackgroundPermissionTutorial() {
    // 1. 检查是否为Android系统
    if (!Platform.isAndroid) {
      return false;
    }

    // 2. 检查设备语言区域是否为中文
    final locale = Get.locale ?? Get.deviceLocale;
    if (locale == null) {
      return false;
    }

    // 检查语言代码是否为中文（zh）
    return locale.languageCode == 'zh';
  }

  /// 构建后台权限条目内容
  Widget _buildBackgroundPermissionItem(bool isDarkMode) {
    return InkWell(
      onTap: () {
        _showBackgroundPermissionGuide();
      },
      child: Padding(
        padding: EdgeInsets.all(16.w),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    '后台运行'.tr, // 确保随时可以唤醒AI助手
                    style: TextStyle(
                      fontSize: 16.sp,
                      fontWeight: FontWeight.w500,
                      color: isDarkMode ? Colors.white : Colors.black87,
                    ),
                  ),
                  SizedBox(height: 4.h),
                  Text(
                    '设置后台运行权限，确保AI助手随时响应您的需求'.tr, // 设置后台运行权限，确保AI助手随时响应您的需求
                    style: TextStyle(
                      fontSize: 12.sp,
                      color: isDarkMode ? Colors.white70 : Colors.grey[600],
                    ),
                  ),
                ],
              ),
            ),
            Icon(
              Icons.arrow_forward_ios,
              size: 16.sp,
              color: isDarkMode ? Colors.white70 : Colors.grey[600],
            ),
          ],
        ),
      ),
    );
  }

  // 显示后台权限设置指南
  void _showBackgroundPermissionGuide() {
    final isDarkMode = Theme.of(Get.context!).brightness == Brightness.dark;

    Get.bottomSheet(
      Container(
        height: Get.height * 0.8,
        decoration: BoxDecoration(
          color: isDarkMode ? Colors.grey[900] : Colors.white,
          borderRadius: BorderRadius.vertical(top: Radius.circular(20.r)),
        ),
        child: Column(
          children: [
            // 顶部标题栏
            Container(
              padding: EdgeInsets.all(16.w),
              decoration: BoxDecoration(
                border: Border(
                    bottom: BorderSide(
                        color: isDarkMode
                            ? Colors.grey[700]!
                            : Colors.grey.shade300)),
              ),
              child: Row(
                children: [
                  Text(
                    '后台运行权限设置'.tr,
                    style: TextStyle(
                      fontSize: 18.sp,
                      fontWeight: FontWeight.bold,
                      color: isDarkMode ? Colors.white : Colors.black,
                    ),
                  ),
                  Spacer(),
                  IconButton(
                    onPressed: () => Get.back(),
                    icon: Icon(
                      Icons.close,
                      color: isDarkMode ? Colors.white : Colors.black,
                    ),
                  ),
                ],
              ),
            ),
            // 内容区域
            Expanded(
              child: SingleChildScrollView(
                padding: EdgeInsets.all(16.w),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      '为确保AI助手能够在后台正常运行，请根据您的手机品牌进行以下设置：'.tr,
                      style: TextStyle(
                        fontSize: 14.sp,
                        color: isDarkMode ? Colors.grey[300] : Colors.grey[600],
                      ),
                    ),
                    SizedBox(height: 20.h),
                    _buildBrandGuide(
                        '华为/荣耀',
                        [
                          '设置 → 应用 → 应用启动管理',
                          '找到Voitrans应用',
                          '关闭"自动管理"',
                          '开启"允许自启动"、"允许关联启动"、"允许后台活动"'
                        ],
                        isDarkMode),
                    _buildBrandGuide(
                        'OPPO',
                        ['设置 → 应用 → 自启动', '找到Voitrans应用', '打开"后台自启动"'],
                        isDarkMode),
                    _buildBrandGuide(
                        'vivo',
                        ['i管家 → 应用管理 → 自启动 → 关联启动', '找到Voitrans应用', '允许"关联启动"'],
                        isDarkMode),
                    _buildBrandGuide(
                        '小米',
                        ['设置 → 应用设置 → 应用管理', '找到Voitrans应用', '打开"自启动"'],
                        isDarkMode),
                    _buildBrandGuide(
                        '三星',
                        ['长按Voitrans图标', '应用程序信息 → 电池', '打开"允许后台活动"'],
                        isDarkMode),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
      isScrollControlled: true,
    );
  }

  // 构建品牌设置指南
  Widget _buildBrandGuide(String brand, List<String> steps, bool isDarkMode) {
    return Container(
      margin: EdgeInsets.only(bottom: 20.h),
      padding: EdgeInsets.all(16.w),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.white.withOpacity(0.05) : Colors.grey[50],
        borderRadius: BorderRadius.circular(12.r),
        border: Border.all(
            color: isDarkMode ? Colors.grey[700]! : Colors.grey.shade300),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            brand,
            style: TextStyle(
              fontSize: 16.sp,
              fontWeight: FontWeight.bold,
              color: isDarkMode ? Colors.blue[400] : Colors.blue[600],
            ),
          ),
          SizedBox(height: 8.h),
          ...steps.asMap().entries.map((entry) {
            int index = entry.key;
            String step = entry.value;
            return Padding(
              padding: EdgeInsets.only(bottom: 4.h),
              child: Row(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Container(
                    width: 20.w,
                    height: 20.w,
                    decoration: BoxDecoration(
                      color: isDarkMode ? Colors.blue[400] : Colors.blue[600],
                      shape: BoxShape.circle,
                    ),
                    child: Center(
                      child: Text(
                        '${index + 1}',
                        style: TextStyle(
                          color: Colors.white,
                          fontSize: 12.sp,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ),
                  ),
                  SizedBox(width: 8.w),
                  Expanded(
                    child: Text(
                      step,
                      style: TextStyle(
                        fontSize: 14.sp,
                        color: isDarkMode ? Colors.white : Colors.black87,
                      ),
                    ),
                  ),
                ],
              ),
            );
          }).toList(),
        ],
      ),
    );
  }

  void _handlePermissionToggle(
    Permission permission,
    PermissionStatus status,
    bool value,
  ) {
    if (value) {
      // 请求权限
      controller.requestPermission(permission);
    } else if (status.isGranted) {
      // 已授权但用户想关闭，引导到系统设置
      controller.openSettings();
    }
  }
}