import 'package:flutter/material.dart';
import 'package:print_bluetooth_thermal/print_bluetooth_thermal.dart';

import '../services/printer_service.dart';
import '../utils/colors.dart';

class PrinterScreen extends StatefulWidget {
  final bool embedded;
  const PrinterScreen({super.key, this.embedded = false});

  @override
  State<PrinterScreen> createState() => _PrinterScreenState();
}

class _PrinterScreenState extends State<PrinterScreen> {
  List<BluetoothInfo> _devices = [];
  bool _loading = false;
  bool _scanning = false;
  bool _connecting = false;

  @override
  void initState() {
    super.initState();
    _loadDevices();
  }

  Future<void> _loadDevices() async {
    setState(() => _loading = true);
    try {
      final enabled = await printerService.isBluetoothEnabled();
      if (!enabled) {
        if (mounted) {
          ScaffoldMessenger.of(context).showSnackBar(
            const SnackBar(
              content: Text('Bluetooth belum aktif. Nyalakan Bluetooth di HP.'),
              backgroundColor: kDanger,
            ),
          );
        }
      }
      _devices = await printerService.getPairedDevices();
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal memuat printer: $e')),
        );
      }
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  Future<void> _scan() async {
    setState(() => _scanning = true);
    try {
      _devices = await printerService.getPairedDevices();
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Gagal scan: $e')),
        );
      }
    } finally {
      if (mounted) setState(() => _scanning = false);
    }
  }

  Future<void> _connect(BluetoothInfo device) async {
    setState(() => _connecting = true);
    final ok = await printerService.connect(device.macAdress);
    if (mounted) {
      setState(() => _connecting = false);
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(ok
              ? 'Terhubung ke ${device.name}'
              : 'Gagal hubungkan ${device.name}'),
          backgroundColor: ok ? kSuccess : kDanger,
        ),
      );
      if (ok) setState(() {});
    }
  }

  Future<void> _disconnect() async {
    await printerService.disconnect();
    if (mounted) setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    final body = _buildBody(context);
    if (widget.embedded) return body;
    return Scaffold(
      appBar: AppBar(
        title: const Text('Printer Bluetooth'),
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(12),
        child: body,
      ),
    );
  }

  Widget _buildBody(BuildContext context) {
    final connected = printerService.isConnected;
    final connectedMac = printerService.connectedMac;

    return Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Card(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Row(
                    children: [
                      const Icon(Icons.print_outlined, color: kAccent),
                      const SizedBox(width: 8),
                      Text(
                        'Printer Bluetooth',
                        style: TextStyle(
                            fontSize: 16, fontWeight: FontWeight.w700, color: kText),
                      ),
                    ],
                  ),
                  const SizedBox(height: 12),
                  Container(
                    width: double.infinity,
                    padding: const EdgeInsets.all(12),
                    decoration: BoxDecoration(
                      color: connected
                          ? kSuccess.withValues(alpha: 0.12)
                          : kSurface,
                      borderRadius: BorderRadius.circular(8),
                      border: Border.all(
                        color: connected ? kSuccess : kBorder,
                      ),
                    ),
                    child: Row(
                      children: [
                        Icon(
                          connected ? Icons.bluetooth_connected : Icons.bluetooth,
                          color: connected ? kSuccess : kMuted,
                        ),
                        const SizedBox(width: 10),
                        Expanded(
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Text(
                                connected ? 'Terhubung' : 'Tidak terhubung',
                                style: TextStyle(
                                  fontWeight: FontWeight.w600,
                                  color: connected ? kSuccess : kMuted,
                                ),
                              ),
                              if (connected && connectedMac != null)
                                Text(
                                  connectedMac,
                                  style: const TextStyle(
                                      fontSize: 12, color: kMuted),
                                ),
                            ],
                          ),
                        ),
                        if (connected)
                          TextButton(
                            onPressed: _connecting ? null : _disconnect,
                            child: const Text('Putus'),
                          ),
                      ],
                    ),
                  ),
                  const SizedBox(height: 14),
                  Row(
                    children: [
                      Expanded(
                        child: OutlinedButton.icon(
                          onPressed: _scanning ? null : _scan,
                          icon: _scanning
                              ? const SizedBox(
                                  height: 16,
                                  width: 16,
                                  child: CircularProgressIndicator(
                                      strokeWidth: 2, color: kAccent),
                                )
                              : const Icon(Icons.refresh),
                          label: Text(_scanning ? 'Scanning...' : 'Scan Ulang'),
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ),
          const SizedBox(height: 12),
          Text(
            'Perangkat Tersedia',
            style: TextStyle(fontSize: 16, fontWeight: FontWeight.w700, color: kText),
          ),
          const SizedBox(height: 10),
          if (_loading)
            const Center(
                child: Padding(
              padding: EdgeInsets.symmetric(vertical: 40),
              child: CircularProgressIndicator(color: kAccent),
            ))
          else if (_devices.isEmpty)
            const Center(
              child: Padding(
                padding: EdgeInsets.symmetric(vertical: 40),
                child: Column(
                  children: [
                    Icon(Icons.print_disabled_outlined, size: 48, color: kMuted),
                    SizedBox(height: 8),
                    Text('Tidak ada printer terpasang',
                        style: TextStyle(color: kMuted)),
                    SizedBox(height: 4),
                    Text('Pasangkan printer di pengaturan Bluetooth HP',
                        style: TextStyle(color: kMuted, fontSize: 12)),
                  ],
                ),
              ),
            )
          else
            ListView.separated(
              shrinkWrap: true,
              physics: const NeverScrollableScrollPhysics(),
              itemCount: _devices.length,
              separatorBuilder: (_, __) => const SizedBox(height: 8),
              itemBuilder: (context, i) {
                final d = _devices[i];
                final isThis = connected && connectedMac == d.macAdress;
                return Card(
                  child: ListTile(
                    leading: CircleAvatar(
                      backgroundColor: isThis
                          ? kSuccess.withValues(alpha: 0.15)
                          : kAccent.withValues(alpha: 0.15),
                      child: Icon(
                        isThis ? Icons.bluetooth_connected : Icons.print_outlined,
                        color: isThis ? kSuccess : kAccent,
                      ),
                    ),
                    title: Text(d.name.isNotEmpty ? d.name : 'Printer',
                        style: const TextStyle(fontWeight: FontWeight.w600)),
                    subtitle: Text(d.macAdress,
                        style: const TextStyle(fontSize: 12, color: kMuted)),
                    trailing: _connecting
                        ? const SizedBox(
                            height: 18,
                            width: 18,
                            child: CircularProgressIndicator(
                                strokeWidth: 2, color: kAccent),
                          )
                        : isThis
                            ? const Chip(
                                label: Text('Aktif',
                                    style: TextStyle(fontSize: 11)),
                                backgroundColor: kSuccess,
                                labelPadding: EdgeInsets.zero,
                              )
                            : TextButton(
                                onPressed: () => _connect(d),
                                child: const Text('Hubungkan'),
                              ),
                  ),
                );
              },
            ),
        ],
      );
  }
}