// ignore_for_file: library_private_types_in_public_api

import 'dart:async';

import 'package:demo_ai_even/ble_manager.dart';
import 'package:demo_ai_even/services/evenai.dart';
import 'package:demo_ai_even/views/even_list_page.dart';
import 'package:demo_ai_even/views/features_page.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

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

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  Timer? scanTimer;
  bool isScanning = false;

  @override
  void initState() {
    super.initState();
    BleManager.get().setMethodCallHandler();
    BleManager.get().startListening();
    BleManager.get().onStatusChanged = _refreshPage;
  }

  void _refreshPage() => setState(() {});

  Future<void> _startScan() async {
    setState(() => isScanning = true);
    await BleManager.get().startScan();
    scanTimer?.cancel();
    scanTimer = Timer(15.seconds, () {
      _stopScan();
    });
  }

  Future<void> _stopScan() async {
    if (isScanning) {
      await BleManager.get().stopScan();
      setState(() => isScanning = false);
    }
  }

  Widget blePairedList() => Expanded(
        child: ListView.separated(
          separatorBuilder: (context, index) => const SizedBox(height: 5),
          itemCount: BleManager.get().getPairedGlasses().length,
          itemBuilder: (context, index) {
            final glasses = BleManager.get().getPairedGlasses()[index];
            return GestureDetector(
              onTap: () async {
                String channelNumber = glasses['channelNumber']!;
                await BleManager.get().connectToGlasses("Pair_$channelNumber");
                _refreshPage();
              },
              child: Container(
                height: 72,
                padding: const EdgeInsets.only(left: 16, right: 16),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(5),
                ),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Column(
                      mainAxisAlignment: MainAxisAlignment.center,
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text('Pair: ${glasses['channelNumber']}'),
                        Text(
                            'Left: ${glasses['leftDeviceName']} \nRight: ${glasses['rightDeviceName']}'),
                      ],
                    ),
                  ],
                ),
              ),
            );
          },
        ),
      );

  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(
          title: const Text('Even AI Demo'),
          actions: [
            InkWell(
              onTap: () {
                print("To Features Page...");
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const FeaturesPage()),
                );
              },
              splashColor: Colors.transparent,
              highlightColor: Colors.transparent,
              child: const Padding(
                padding:
                    EdgeInsets.only(left: 16, top: 12, bottom: 14, right: 16),
                child: Icon(Icons.menu),
              ),
            ),
          ],
        ),
        body: Padding(
          padding:
              const EdgeInsets.only(left: 16, right: 16, top: 12, bottom: 44),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.start,
            children: [
              GestureDetector(
                onTap: () async {
                  if (BleManager.get().getConnectionStatus() ==
                      'Not connected') {
                    _startScan();
                  }
                },
                child: Container(
                  height: 100,
                  decoration: BoxDecoration(
                    color: Colors.white,
                    borderRadius: BorderRadius.circular(5),
                  ),
                  alignment: Alignment.center,
                  child: Text(BleManager.get().getConnectionStatus(),
                      style: const TextStyle(fontSize: 16)),
                ),
              ),
              const SizedBox(height: 16),
              if (BleManager.get().getConnectionStatus() == 'Not connected')
                blePairedList(),
              if (BleManager.get().isConnected)
                Expanded(
                  child: Column(
                    children: [
                      // Test button for displaying text on glasses
                      Container(
                        width: double.infinity,
                        height: 60,
                        margin: const EdgeInsets.only(bottom: 16),
                        child: ElevatedButton(
                          onPressed: () async {
                            try {
                              await BleManager.get().displayTextOnGlasses("Hello G1!");
                              ScaffoldMessenger.of(context).showSnackBar(
                                const SnackBar(content: Text("Text sent to glasses!")),
                              );
                            } catch (e) {
                              ScaffoldMessenger.of(context).showSnackBar(
                                SnackBar(content: Text("Error: $e")),
                              );
                            }
                          },
                          style: ElevatedButton.styleFrom(
                            backgroundColor: Colors.blue,
                            foregroundColor: Colors.white,
                            shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(8),
                            ),
                          ),
                          child: const Text(
                            "Display Text on G1 Glasses",
                            style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
                          ),
                        ),
                      ),
                      // AI History Section
                      Expanded(
                        child: GestureDetector(
                          onTap: () async {
                            print("To AI History List...");
                            Navigator.push(
                              context,
                              MaterialPageRoute(
                                builder: (context) => const EvenAIListPage(),
                              ),
                            );
                          },
                          child: Container(
                            color: Colors.white,
                            padding: const EdgeInsets.all(16),
                            alignment: Alignment.topCenter,
                            child: SingleChildScrollView(
                              child: StreamBuilder<String>(
                                stream: EvenAI.textStream,
                                initialData:
                                    "Press and hold left TouchBar to engage Even AI.",
                                builder: (context, snapshot) => Obx(
                                  () => EvenAI.isEvenAISyncing.value
                                      ? const SizedBox(
                                          width: 50,
                                          height: 50,
                                          child: CircularProgressIndicator(),
                                        )
                                      : Text(
                                          snapshot.data ?? "Loading...",
                                          style: TextStyle(
                                              fontSize: 14,
                                              color: BleManager.get().isConnected
                                                  ? Colors.black
                                                  : Colors.grey.withOpacity(0.5)),
                                          textAlign: TextAlign.center,
                                        ),
                                ),
                              ),
                            ),
                          ),
                        ),
                      ),
                    ],
                  ),
                ),
            ],
          ),
        ),
      );

  @override
  void dispose() {
    scanTimer?.cancel();
    isScanning = false;
    BleManager.get().onStatusChanged = null;
    super.dispose();
  }
}