import 'package:echomeet_device_sdk/echomeet_device_sdk.dart';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart';

import '../../../core/theme/app_palette.dart';
import '../../../data/services/background_launch_consent.dart';
import '../../../data/services/holder_device_service.dart';
import '../../../routes/app_routes.dart';
import '../../main_tab/controllers/main_tab_controller.dart';

/// 蓝讯方案设备（AI手机支架）的扫描 / 连接页。
///
/// 走的是从 echomeet 拉过来的 [EchoMeetDeviceSdk]，与杰理耳机的扫描页
/// （DevicesView）是两条独立链路，互不干扰。
class HolderScanView extends StatefulWidget {
  const HolderScanView({super.key});

  @override
  State<HolderScanView> createState() => _HolderScanViewState();
}

class _HolderScanViewState extends State<HolderScanView> {
  late final HolderDeviceService _service;

  @override
  void initState() {
    super.initState();
    _service = Get.isRegistered<HolderDeviceService>()
        ? Get.find<HolderDeviceService>()
        : Get.put(HolderDeviceService());
    // 进页面自动开扫
    WidgetsBinding.instance.addPostFrameCallback((_) => _service.startScan());
  }

  @override
  void dispose() {
    _service.stopScan();
    super.dispose();
  }

  bool _connecting = false;

  Future<void> _connect(EchoMeetScannedDevice d) async {
    if (_connecting) return;
    // Android 上 SDK 的 connect() 本身就是向系统注册后台扫连（设备靠近就唤醒
    // 本应用），属于自启动行为，必须先向用户明示并取得同意。
    if (!await BackgroundLaunchConsent.ensure(userInitiated: true)) {
      Get.snackbar(
          'autoConnectRequired'.tr,
          BackgroundLaunchConsent.declined
              ? 'autoConnectReenableHint'.tr
              : 'autoConnectRequiredDesc'.tr,
          snackPosition: SnackPosition.TOP);
      return;
    }
    setState(() => _connecting = true);
    // 用户主动点了连接：允许再申请一次系统蓝牙权限
    _service.resetPermissionDenied();
    // connect() 只是注册后台扫连，真正连上要等 connectionState
    final registered = await _service.connect(d);
    final ok = registered && await _service.waitConnected();
    if (!mounted) return;
    setState(() => _connecting = false);
    if (ok) {
      Get.snackbar('连接成功', '${d.name} 已连接',
          snackPosition: SnackPosition.TOP,
          duration: const Duration(seconds: 2));
      Get.offAllNamed(Routes.home);
      // 回到主框架后切到「设备」页，展示刚连上的设备
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (Get.isRegistered<MainTabController>()) {
          MainTabController.to.changeTab(MainTabController.tabDevice);
        }
      });
    } else {
      Get.snackbar('连接失败', 'holderRetryHint'.tr,
          snackPosition: SnackPosition.TOP);
    }
  }

  @override
  Widget build(BuildContext context) {
    final bool isDark = Theme.of(context).brightness == Brightness.dark;
    return Scaffold(
      backgroundColor: AppPalette.background(isDark),
      appBar: AppBar(
        backgroundColor: AppPalette.background(isDark),
        elevation: 0,
        title: Text('holderAddTitle'.tr),
        actions: [
          Obx(() => _service.isScanning.value
              ? Padding(
                  padding: EdgeInsets.only(right: 16.w),
                  child: Center(
                    child: SizedBox(
                      width: 18.w,
                      height: 18.w,
                      child: const CircularProgressIndicator(strokeWidth: 2),
                    ),
                  ),
                )
              : IconButton(
                  icon: const Icon(Icons.refresh),
                  onPressed: _service.startScan,
                )),
        ],
      ),
      body: _connecting
          ? Center(
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  CircularProgressIndicator(),
                  SizedBox(height: 16),
                  Text('holderConnecting'.tr),
                ],
              ),
            )
          : Obx(() {
        final list = _service.scanned;
        if (list.isEmpty) {
          return Center(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                Icon(Icons.bluetooth_searching,
                    size: 56.sp, color: AppPalette.brand300),
                SizedBox(height: 12.h),
                Text(
                  _service.isScanning.value ? 'holderSearching'.tr : 'holderNotFound'.tr,
                  style: TextStyle(
                      fontSize: 15.sp, color: AppPalette.textSecondary(isDark)),
                ),
                SizedBox(height: 6.h),
                Text(
                  'holderPairHint'.tr,
                  style: TextStyle(
                      fontSize: 12.sp, color: AppPalette.textHint(isDark)),
                ),
              ],
            ),
          );
        }
        return ListView.separated(
          padding: EdgeInsets.symmetric(horizontal: 16.w, vertical: 16.h),
          itemCount: list.length,
          separatorBuilder: (_, __) => SizedBox(height: 12.h),
          itemBuilder: (context, i) {
            final d = list[i];
            return GestureDetector(
              behavior: HitTestBehavior.opaque,
              onTap: () => _connect(d),
              child: Container(
                padding: EdgeInsets.all(14.w),
                decoration: BoxDecoration(
                  color: AppPalette.surface(isDark),
                  borderRadius: BorderRadius.circular(14.r),
                  border: Border.all(color: AppPalette.border(isDark)),
                ),
                child: Row(
                  children: [
                    Icon(Icons.stay_current_portrait,
                        size: 26.sp, color: AppPalette.accent),
                    SizedBox(width: 12.w),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            d.displayName,
                            style: TextStyle(
                              fontSize: 15.sp,
                              fontWeight: FontWeight.w600,
                              color: AppPalette.textPrimary(isDark),
                            ),
                          ),
                          SizedBox(height: 2.h),
                          Text(
                            d.address,
                            style: TextStyle(
                              fontSize: 11.sp,
                              color: AppPalette.textHint(isDark),
                            ),
                          ),
                        ],
                      ),
                    ),
                    Text('连接',
                        style: TextStyle(
                            fontSize: 13.sp,
                            fontWeight: FontWeight.w600,
                            color: AppPalette.accent)),
                  ],
                ),
              ),
            );
          },
        );
      }),
    );
  }
}