import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:flutter_blue_plus/flutter_blue_plus.dart' as fbp;
import '../controllers/ble_controller.dart';

class BleView extends GetView<BleController> {
  const BleView({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,
      appBar: AppBar(
        title: Text(
          'BLE设备扫描',
          style: TextStyle(
            color: isDarkMode ? Colors.white : Colors.black,
            fontSize: 18.sp,
            fontWeight: FontWeight.bold,
          ),
        ),
        backgroundColor: isDarkMode ? Colors.grey[900] : Colors.white,
        elevation: 0,
        iconTheme: IconThemeData(
          color: isDarkMode ? Colors.white : Colors.black,
        ),
        actions: [
          Obx(() => IconButton(
                onPressed: controller.isScanning.value
                    ? controller.stopScan
                    : controller.startScan,
                icon: Icon(
                  controller.isScanning.value ? Icons.stop : Icons.refresh,
                  color: controller.isScanning.value
                      ? Colors.red
                      : (isDarkMode ? Colors.white : Colors.black),
                ),
              )),
        ],
      ),
      body: SafeArea(
        child: Column(
          children: [
            // 状态栏
            _buildStatusBar(isDarkMode),

            // 连接的设备信息
            _buildConnectedDevice(isDarkMode),

            // 设备列表
            Expanded(
              child: _buildDeviceList(isDarkMode),
            ),
          ],
        ),
      ),
      floatingActionButton: Obx(() => FloatingActionButton(
            onPressed: controller.isScanning.value
                ? controller.stopScan
                : controller.startScan,
            backgroundColor:
                controller.isScanning.value ? Colors.red : Colors.blue,
            child: Icon(
              controller.isScanning.value
                  ? Icons.stop
                  : Icons.bluetooth_searching,
              color: Colors.white,
            ),
          )),
    );
  }

  // 状态栏
  Widget _buildStatusBar(bool isDarkMode) {
    return Obx(() => Container(
          width: double.infinity,
          padding: EdgeInsets.all(16.w),
          margin: EdgeInsets.all(16.w),
          decoration: BoxDecoration(
            color: isDarkMode ? Colors.grey[800] : Colors.grey[100],
            borderRadius: BorderRadius.circular(12.r),
          ),
          child: Column(
            children: [
              Row(
                children: [
                  Icon(
                    controller.isBluetoothOn.value
                        ? Icons.bluetooth
                        : Icons.bluetooth_disabled,
                    color: controller.isBluetoothOn.value
                        ? Colors.blue
                        : Colors.red,
                    size: 24.w,
                  ),
                  SizedBox(width: 8.w),
                  Text(
                    controller.isBluetoothOn.value ? '蓝牙已开启' : '蓝牙已关闭',
                    style: TextStyle(
                      color: isDarkMode ? Colors.white : Colors.black,
                      fontSize: 16.sp,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                  Spacer(),
                  if (controller.isScanning.value)
                    SizedBox(
                      width: 20.w,
                      height: 20.w,
                      child: CircularProgressIndicator(
                        strokeWidth: 2,
                        valueColor: AlwaysStoppedAnimation<Color>(Colors.blue),
                      ),
                    ),
                ],
              ),
              if (controller.errorMessage.value.isNotEmpty) ...[
                SizedBox(height: 8.h),
                Text(
                  controller.errorMessage.value,
                  style: TextStyle(
                    color: Colors.red,
                    fontSize: 14.sp,
                  ),
                ),
              ],
              if (controller.isScanning.value) ...[
                SizedBox(height: 8.h),
                Text(
                  '正在扫描设备...',
                  style: TextStyle(
                    color: Colors.blue,
                    fontSize: 14.sp,
                  ),
                ),
              ],
            ],
          ),
        ));
  }

  // 已连接设备信息
  Widget _buildConnectedDevice(bool isDarkMode) {
    return Obx(() {
      if (controller.connectedDevice.value == null) {
        return SizedBox.shrink();
      }

      final device = controller.connectedDevice.value!;
      return Container(
        width: double.infinity,
        padding: EdgeInsets.all(16.w),
        margin: EdgeInsets.symmetric(horizontal: 16.w, vertical: 8.h),
        decoration: BoxDecoration(
          color: Colors.green.withOpacity(0.1),
          border: Border.all(color: Colors.green, width: 1),
          borderRadius: BorderRadius.circular(12.r),
        ),
        child: Row(
          children: [
            Icon(
              Icons.bluetooth_connected,
              color: Colors.green,
              size: 24.w,
            ),
            SizedBox(width: 12.w),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    '已连接设备',
                    style: TextStyle(
                      color: Colors.green,
                      fontSize: 12.sp,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                  Text(
                    device.platformName.isNotEmpty
                        ? device.platformName
                        : '未知设备',
                    style: TextStyle(
                      color: isDarkMode ? Colors.white : Colors.black,
                      fontSize: 16.sp,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                  Text(
                    device.remoteId.toString(),
                    style: TextStyle(
                      color: isDarkMode ? Colors.white70 : Colors.black54,
                      fontSize: 12.sp,
                    ),
                  ),
                ],
              ),
            ),
            IconButton(
              onPressed: controller.disconnectDevice,
              icon: Icon(
                Icons.close,
                color: Colors.red,
                size: 20.w,
              ),
            ),
          ],
        ),
      );
    });
  }

  // 设备列表
  Widget _buildDeviceList(bool isDarkMode) {
    return Obx(() {
      if (controller.scanResults.isEmpty) {
        return Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Icon(
                Icons.bluetooth_searching,
                size: 64.w,
                color: isDarkMode ? Colors.white54 : Colors.black54,
              ),
              SizedBox(height: 16.h),
              Text(
                controller.isScanning.value ? '正在搜索设备...' : '点击扫描按钮开始搜索BLE设备',
                style: TextStyle(
                  color: isDarkMode ? Colors.white54 : Colors.black54,
                  fontSize: 16.sp,
                ),
                textAlign: TextAlign.center,
              ),
            ],
          ),
        );
      }

      return ListView.builder(
        padding: EdgeInsets.symmetric(horizontal: 16.w),
        itemCount: controller.scanResults.length,
        itemBuilder: (context, index) {
          final result = controller.scanResults[index];
          return _buildDeviceItem(result, isDarkMode);
        },
      );
    });
  }

  // 设备项
  Widget _buildDeviceItem(fbp.ScanResult result, bool isDarkMode) {
    final deviceName = controller.getDeviceName(result);
    final isConnected =
        controller.connectedDevice.value?.remoteId == result.device.remoteId;

    return Container(
      margin: EdgeInsets.only(bottom: 12.h),
      decoration: BoxDecoration(
        color: isDarkMode ? Colors.grey[800] : Colors.white,
        borderRadius: BorderRadius.circular(12.r),
        border: Border.all(
          color: isConnected
              ? Colors.green
              : (isDarkMode ? Colors.grey[700]! : Colors.grey[300]!),
          width: isConnected ? 2 : 1,
        ),
        boxShadow: [
          BoxShadow(
            color: Colors.black.withOpacity(0.05),
            blurRadius: 8,
            offset: Offset(0, 2),
          ),
        ],
      ),
      child: ListTile(
        contentPadding: EdgeInsets.all(16.w),
        leading: Container(
          width: 48.w,
          height: 48.w,
          decoration: BoxDecoration(
            color: isConnected
                ? Colors.green.withOpacity(0.1)
                : Colors.blue.withOpacity(0.1),
            borderRadius: BorderRadius.circular(24.r),
          ),
          child: Icon(
            isConnected ? Icons.bluetooth_connected : Icons.bluetooth,
            color: isConnected ? Colors.green : Colors.blue,
            size: 24.w,
          ),
        ),
        title: Text(
          deviceName,
          style: TextStyle(
            color: isDarkMode ? Colors.white : Colors.black,
            fontSize: 16.sp,
            fontWeight: FontWeight.bold,
          ),
        ),
        subtitle: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            SizedBox(height: 4.h),
            Text(
              result.device.remoteId.toString(),
              style: TextStyle(
                color: isDarkMode ? Colors.white70 : Colors.black54,
                fontSize: 12.sp,
              ),
            ),
            SizedBox(height: 4.h),
            Row(
              children: [
                Icon(
                  controller.getSignalStrengthIcon(result.rssi),
                  size: 16.w,
                  color: isDarkMode ? Colors.white70 : Colors.black54,
                ),
                SizedBox(width: 4.w),
                Text(
                  '${result.rssi} dBm (${controller.getSignalStrengthText(result.rssi)})',
                  style: TextStyle(
                    color: isDarkMode ? Colors.white70 : Colors.black54,
                    fontSize: 12.sp,
                  ),
                ),
              ],
            ),
          ],
        ),
        trailing: isConnected
            ? Icon(
                Icons.check_circle,
                color: Colors.green,
                size: 24.w,
              )
            : IconButton(
                onPressed: () => controller.connectToDevice(result.device),
                icon: Icon(
                  Icons.connect_without_contact,
                  color: Colors.blue,
                  size: 24.w,
                ),
              ),
        onTap: isConnected
            ? null
            : () => controller.connectToDevice(result.device),
      ),
    );
  }
}