import 'package:abawo_bt_app/controller/bluetooth.dart';
import 'package:abawo_bt_app/database/database.dart';
import 'package:abawo_bt_app/model/bluetooth_device_model.dart';
import 'package:abawo_bt_app/widgets/device_listitem.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';

class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Abawo BT App'),
        actions: [
          IconButton(
            icon: const Icon(Icons.settings),
            onPressed: () => context.go('/settings'),
          ),
        ],
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              'Welcome to Abawo BT App',
              style: TextStyle(fontSize: 20),
            ),
            const SizedBox(height: 20),
            // Devices Section
            Container(
              padding: const EdgeInsets.only(left: 16, right: 16),
              child: Column(
                children: [
                  Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      const Text(
                        'Devices',
                        style: TextStyle(
                            fontSize: 20, fontWeight: FontWeight.w500),
                      ),
                      IconButton(
                        icon: const Icon(Icons.add_circle),
                        onPressed: () => context.go('/connect_device'),
                        tooltip: 'Connect a device',
                      ),
                    ],
                  ),
                  const SizedBox(height: 10),
                  Container(
                    padding: const EdgeInsets.all(16),
                    decoration: BoxDecoration(
                      border: Border.all(color: Colors.grey.shade300),
                      borderRadius: BorderRadius.circular(8),
                    ),
                    child: const Center(
                      child: DevicesList(),
                    ),
                  ),
                ],
              ),
            ),
            const SizedBox(height: 30),
            ElevatedButton(
              onPressed: () => context.go('/settings'),
              child: const Text('Go to Settings'),
            ),
          ],
        ),
      ),
    );
  }
}

class DevicesList extends ConsumerStatefulWidget {
  const DevicesList({super.key});

  @override
  ConsumerState<DevicesList> createState() => _DevicesListState();
}

class _DevicesListState extends ConsumerState<DevicesList> {
  String? _connectingDeviceId; // ID of device currently being connected

  Future<void> _removeDevice(ConnectedDevice device) async {
    final shouldRemove = await showDialog<bool>(
      context: context,
      builder: (dialogContext) => AlertDialog(
        title: const Text('Remove device?'),
        content:
            Text('Do you want to remove ${device.deviceName} from the app?'),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(dialogContext).pop(false),
            child: const Text('Cancel'),
          ),
          FilledButton(
            onPressed: () => Navigator.of(dialogContext).pop(true),
            child: const Text('Remove'),
          ),
        ],
      ),
    );

    if (shouldRemove != true || !mounted) {
      return;
    }

    final result = await ref
        .read(nConnectedDevicesProvider.notifier)
        .deleteConnectedDevice(device.id);

    if (!mounted) {
      return;
    }

    if (result.isErr()) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
            content: Text('Failed to remove device: ${result.unwrapErr()}')),
      );
      return;
    }

    if (_connectingDeviceId == device.deviceAddress) {
      setState(() {
        _connectingDeviceId = null;
      });
    }

    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('${device.deviceName} removed from the app.')),
    );
  }

  @override
  Widget build(BuildContext context) {
    final asyncDevices = ref.watch(nConnectedDevicesProvider);

    return asyncDevices.when(
      loading: () => const Center(
        child: CircularProgressIndicator(),
      ),
      error: (error, stackTrace) => Center(
        child: Text(
          'Error loading devices: ${error.toString()}',
          style: TextStyle(color: Colors.red),
          textAlign: TextAlign.center,
        ),
      ),
      data: (devices) {
        if (devices.isEmpty) {
          return const Center(
            child: Text(
              'No devices connected yet',
              style: TextStyle(color: Colors.grey),
            ),
          );
        }

        return ListView.builder(
          itemCount: devices.length,
          shrinkWrap: true,
          itemBuilder: (context, index) {
            final device = devices[index];
            return InkWell(
              onTap: () async {
                if (_connectingDeviceId != null) return;
                setState(() {
                  _connectingDeviceId = device.deviceAddress;
                });

                try {
                  final controller = await ref.read(bluetoothProvider.future);
                  final result = await controller.connectById(
                    device.deviceAddress,
                    timeout: const Duration(seconds: 10),
                  );

                  if (result.isOk()) {
                    context.go('/device/${device.deviceAddress}');
                  } else {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(
                        content: Text(
                            'Connection failed. Is the device turned on and in range?'),
                        duration: const Duration(seconds: 3),
                      ),
                    );
                  }
                } catch (e) {
                  ScaffoldMessenger.of(context).showSnackBar(
                    SnackBar(content: Text('Error: ${e.toString()}')),
                  );
                } finally {
                  setState(() {
                    _connectingDeviceId = null;
                  });
                }
              },
              child: DeviceListItem(
                deviceName: device.deviceName,
                deviceId: device.deviceAddress,
                type: deviceTypeFromString(device.deviceType),
                isConnecting: device.deviceAddress == _connectingDeviceId,
                trailing: IconButton(
                  tooltip: 'Remove device',
                  icon: const Icon(Icons.delete_outline),
                  onPressed: () => _removeDevice(device),
                ),
              ),
            );
          },
        );
      },
    );
  }
}