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 'package:device_info_plus/device_info_plus.dart';

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: Obx(() {
        if (controller.permissionStatuses.isEmpty) {
          return const Center(child: CircularProgressIndicator());
        }

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

  List<Widget> _buildPermissionGroups(bool isDarkMode) {
    final groups = PermissionGroup.getPlatformGroups();
    final List<Widget> widgets = [];

    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 widgets;
  }

  bool _shouldShowGroup(PermissionGroup group) {
    // Android特定权限组
    if (group.titleKey == 'communicationPermissions' || 
        group.titleKey == 'alarmPermissions') {
      return Platform.isAndroid;
    }
    // 蓝牙权限组：Android 12+或iOS才显示
    if (group.titleKey == 'bluetoothPermissions') {
      return controller.shouldShowBluetoothPermissions();
    }
    // 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,
      ),
    );
  }

  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();
    }
  }
}