import 'dart:async';

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

import '/core/utils/logger.dart';
import '/data/models/appconfig.dart';
import '/data/services/ble_manager.dart';
import '/routes/app_routes.dart';

/// 设备页控制器：扫描杰理设备、点击连接、断开。
/// 旧的绑定 / 解绑流程已下线。
class DevicesController extends GetxController {
  late final BleManager _bleManager;

  // 扫描结果（直接绑定到 BleManager 内部 Rx 列表）
  RxList<JieliDevice> get scannedDevices => _bleManager.scannedDevices;
  RxBool get isScanning => _bleManager.isScanning;

  // 当前连接地址（响应式）
  RxInt get connectionStateRx => _bleManager.connectionStateRx;

  String? get currentDeviceAddress => _bleManager.currentDeviceAddress;

  // 正在连接的目标地址（用于 tile UI 反馈）
  final RxnString connectingAddress = RxnString();

  @override
  void onInit() {
    super.onInit();
    _bleManager = Get.find<BleManager>();
    Future.microtask(startScan);
  }

  @override
  void onClose() {
    _bleManager.stopScan();
    super.onClose();
  }

  Future<void> startScan() async {
    print('[BLE] [SCAN] DevicesController.startScan 被调用');
    final granted = await _ensureBluetoothPermission();
    print('[BLE] [SCAN] 权限申请结果: granted=$granted');
    if (!granted) {
      Get.snackbar('tip'.tr, 'pleaseGrantBluetoothPermission'.tr);
      return;
    }
    // 设备页是通用绑定入口，扫描白名单 = AppConfig 下发的所有产品 scanuuid
    final uuids =
        AppConfig.isInitialized() ? AppConfig.allproductUuids() : <String>[];
    final ok = await _bleManager.startScan(uuids: uuids);
    if (!ok) {
      final err = _bleManager.lastScanError ?? 'unknown';
      print('[BLE] [SCAN] 扫描启动失败: $err');
      Get.snackbar('error'.tr, '${'startScanFailed'.tr}: $err');
    }
  }

  Future<void> stopScan() async {
    await _bleManager.stopScan();
  }

  Future<void> connect(JieliDevice device) async {
    if (connectingAddress.value != null) {
      Logger.info('连接进行中，忽略重复点击: ${device.address}');
      return;
    }
    // 已连上同一台设备 → 直接进首页，避免卡在「连接中」对话框
    if (_bleManager.isConnected &&
        _bleManager.currentDeviceAddress == device.address) {
      Logger.info('设备已处于连接状态，直接进入首页: ${device.address}');
      Get.offAllNamed(Routes.home);
      return;
    }

    Logger.info('连接设备: ${device.name} ${device.address}');
    connectingAddress.value = device.address;
    await _bleManager.stopScan();

    // 必须 BLE 连接 OK + RCSP init 成功 才算「真正连上」。
    // 任一环节失败立即判失败，避免 dialog 关掉之后又被断开。
    final completer = Completer<bool>();
    bool gotConnectionOk = false;

    final evtSub = Jielihome.instance.events.listen((evt) {
      if (evt is ConnectionStateEvent) {
        if (evt.address != device.address) return;
        if (evt.state == ConnectionStateEvent.connectionOk) {
          gotConnectionOk = true;
        } else if (evt.state == ConnectionStateEvent.connectionDisconnect) {
          if (!completer.isCompleted) completer.complete(false);
        }
      } else if (evt is RcspInitEvent) {
        if (evt.address != device.address) return;
        if (evt.success && gotConnectionOk) {
          if (!completer.isCompleted) completer.complete(true);
        } else if (!evt.success) {
          if (!completer.isCompleted) completer.complete(false);
        }
      }
    });

    _showConnectingDialog(device);

    try {
      await _bleManager.connectDevice(device);
      final ok = await completer.future
          .timeout(const Duration(seconds: 20), onTimeout: () => false);

      if (Get.isDialogOpen ?? false) Get.back();

      if (ok) {
        Get.offAllNamed(Routes.home);
      } else {
        Get.snackbar('error'.tr, 'connectionFailure'.tr);
      }
    } catch (e) {
      Logger.error('连接异常: $e');
      if (Get.isDialogOpen ?? false) Get.back();
      Get.snackbar('error'.tr, 'connectionFailure'.tr);
    } finally {
      await evtSub.cancel();
      connectingAddress.value = null;
    }
  }

  void _showConnectingDialog(JieliDevice device) {
    Get.dialog(
      PopScope(
        canPop: false,
        child: Dialog(
          backgroundColor: Colors.transparent,
          elevation: 0,
          insetPadding: EdgeInsets.symmetric(horizontal: 40.w),
          child: Container(
            padding: EdgeInsets.symmetric(horizontal: 24.w, vertical: 28.h),
            decoration: BoxDecoration(
              color: Get.isDarkMode
                  ? const Color(0xFF1C1C1E)
                  : Colors.white,
              borderRadius: BorderRadius.circular(16.r),
            ),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                SizedBox(
                  width: 44.w,
                  height: 44.w,
                  child: const CircularProgressIndicator(
                    strokeWidth: 3,
                    valueColor:
                        AlwaysStoppedAnimation<Color>(Color(0xFF0066CC)),
                  ),
                ),
                SizedBox(height: 18.h),
                Text(
                  'connectingDevice'.tr,
                  style: TextStyle(
                    fontSize: 15.sp,
                    fontWeight: FontWeight.w600,
                    color: Get.isDarkMode ? Colors.white : Colors.black87,
                  ),
                ),
                SizedBox(height: 6.h),
                Text(
                  device.name.isEmpty ? device.address : device.name,
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                  style: TextStyle(
                    fontSize: 12.sp,
                    color: Get.isDarkMode ? Colors.white54 : Colors.black54,
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
      barrierDismissible: false,
    );
  }

  Future<void> disconnect() async {
    await _bleManager.disconnect();
  }

  bool isConnected(JieliDevice device) {
    return _bleManager.isConnected &&
        _bleManager.currentDeviceAddress == device.address;
  }

  Future<bool> _ensureBluetoothPermission() async {
    try {
      // Android 12+：BLUETOOTH_SCAN 已声明 neverForLocation，所以不强制要求定位。
      // 但实际不少 ROM 仍要求定位才能扫到 BLE 设备 —— 同时申请，谁拒绝就报错。
      final results = await [
        Permission.bluetoothScan,
        Permission.bluetoothConnect,
        Permission.locationWhenInUse,
      ].request();
      print('[BLE] [SCAN] 权限申请详情: $results');
      // 至少 scan + connect 必须授权；location 缺失警告但不一定阻塞
      final scanOk = results[Permission.bluetoothScan]?.isGranted ?? false;
      final connectOk = results[Permission.bluetoothConnect]?.isGranted ?? false;
      return scanOk && connectOk;
    } catch (e) {
      Logger.error('请求蓝牙权限失败: $e');
      return false;
    }
  }
}