import 'package:flutter/material.dart';
import 'package:flutter_sdk/starcloud_flutter_sdk.dart';
import 'package:starcloud/entity/star_cloud_lock_list.dart' as scl;
import '../l10n.dart';
import '../global.dart';
import '../widgets/common_widgets.dart';

class DeviceScanTab extends StatefulWidget {
  const DeviceScanTab({super.key});

  @override
  State<DeviceScanTab> createState() => _DeviceScanTabState();
}

class _DeviceScanTabState extends State<DeviceScanTab> {
  bool _scanning = false;
  bool _pairing = false;
  List<dynamic> _devices = [];
  final List<String> _log = [];

  void _log_(String msg) {
    final ts = DateTime.now().toIso8601String().substring(11, 19);
    setState(() => _log.add('[$ts] $msg'));
  }

  Future<void> _scan() async {
    if (!sdkCloudAccountReady.value) {
      _log_(S.isEn
          ? 'Set an SDK cloud account before scanning and pairing a lock.'
          : '请先在“登录”页创建或设置 SDK 星云账户，再扫描绑定锁。');
      return;
    }
    setState(() {
      _scanning = true;
      _devices = [];
    });
    _log_(S.isEn ? 'Scan start (10s)...' : '开始扫描（10 秒超时）...');
    try {
      await StarCloudClient.instance.device.scanDeviceList(
          timeout: 10,
          onScan: (results) {
            setState(() => _devices = results);
          });
      _log_(S.isEn
          ? 'Done. Found ${_devices.length}'
          : '扫描完成，发现 ${_devices.length} 个设备');
    } catch (e) {
      _log_('${S.isEn ? "Failed" : "失败"}: $e');
    } finally {
      setState(() => _scanning = false);
    }
  }

  Future<void> _pair(int idx) async {
    if (!sdkCloudAccountReady.value) {
      _log_(
          S.isEn ? 'Please set an SDK cloud account first.' : '请先设置 SDK 星云账户。');
      return;
    }
    setState(() => _pairing = true);
    _log_(S.isEn ? 'Pairing...' : '正在配对...');
    try {
      final lock = await StarCloudClient.instance.device
          .pairDevice(scanResult: _devices[idx]);
      // 更新 ValueNotifier 的值
      wifiConfiguredLockId.value = null;
      pairedLockId.value = lock.lockId;
      pairedLock.value = lock;

      _log_('${S.isEn ? "Success" : "成功"}! ID: ${lock.lockId}');
    } catch (e) {
      _log_('${S.isEn ? "Failed" : "失败"}: $e');
    } finally {
      setState(() => _pairing = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<bool>(
      valueListenable: S.langNotifier,
      builder: (context, isEn, _) {
        return Column(
          children: [
            Padding(
              padding: const EdgeInsets.all(12),
              child: Row(
                children: [
                  Expanded(
                    child: ElevatedButton.icon(
                      onPressed: _scanning ? null : _scan,
                      icon: _scanning
                          ? const SizedBox(
                              width: 16,
                              height: 16,
                              child: CircularProgressIndicator(strokeWidth: 2))
                          : const Icon(Icons.bluetooth_searching),
                      label: Text(_scanning ? S.btnScanning : S.btnScan),
                    ),
                  ),
                  const SizedBox(width: 8),
                  ElevatedButton(
                      onPressed: _scanning
                          ? () => StarCloudClient.instance.device
                              .stopScan()
                              .then((_) => setState(() => _scanning = false))
                          : null,
                      child: Text(S.btnStop)),
                ],
              ),
            ),
            // 使用 ValueListenableBuilder 监听配对状态
            ValueListenableBuilder<int?>(
              valueListenable: pairedLockId,
              builder: (context, id, _) {
                if (id == null) return const SizedBox.shrink();
                return Container(
                  padding:
                      const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
                  alignment: Alignment.centerLeft,
                  child: Chip(
                    label: Text('${S.pairedStatus}: #$id'),
                    backgroundColor: Colors.green.shade50,
                    onDeleted: () {
                      wifiConfiguredLockId.value = null;
                      pairedLockId.value = null;
                      pairedLock.value = null;
                    },
                  ),
                );
              },
            ),
            Expanded(
              child: ValueListenableBuilder<scl.StarCloudLock?>(
                valueListenable: pairedLock,
                builder: (context, paired, _) {
                  if (_devices.isEmpty) {
                    return Center(
                      child: Text(
                        S.scanHint,
                        style: const TextStyle(color: Colors.grey),
                      ),
                    );
                  }
                  return ListView.separated(
                    padding: const EdgeInsets.symmetric(horizontal: 12),
                    itemCount: _devices.length,
                    separatorBuilder: (_, __) => const Divider(height: 1),
                    itemBuilder: (context, i) {
                      final device = _devices[i] as StarCloudScanResult;
                      final isPaired = _isPairedDevice(device, paired);
                      return ListTile(
                        title: Text(device.advName.isNotEmpty
                            ? device.advName
                            : (S.isEn ? 'Unknown' : '未知设备')),
                        subtitle: Text('MAC: ${device.id}'),
                        trailing: ElevatedButton(
                          onPressed:
                              _pairing || isPaired ? null : () => _pair(i),
                          child: Text(isPaired ? S.pairedStatus : S.btnPair),
                        ),
                      );
                    },
                  );
                },
              ),
            ),
            LogArea(log: _log),
          ],
        );
      },
    );
  }

  bool _isPairedDevice(
    StarCloudScanResult device,
    scl.StarCloudLock? paired,
  ) {
    if (paired == null) return false;
    return paired.mac == device.id ||
        paired.bluetooth.bluetoothDeviceName == device.advName;
  }
}