path: root/main.dart

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

void main() {
  runApp(const MyApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        brightness: Brightness.light,
      ),
      darkTheme: ThemeData(
        brightness: Brightness.dark,
      ),
      themeMode: ThemeMode.dark,
      home: const MyHomePage(title: 'Socket Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  late Socket _socket;
  final TextEditingController _inputController = TextEditingController();
  final List<String> _msgs = [];
  String address = "";

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Colors.purple,
        title: Text(widget.title),
      ),
      body: Column(children: [
        Expanded(
            child: ListView.builder(
          padding: EdgeInsets.all(10.0),
          itemCount: _msgs.length,
          itemBuilder: (context, index) {
            var msg = _msgs[index];
            String user = "";
            String data = "";
            int i;
            for (i = 0; i < msg.length; i++) {
              if (msg[i] == '=') {
                i++;
                break;
              }
              user += msg[i];
            }
            for (; i < msg.length; i++) {
              data += msg[i];
            }

            if (user == address) {
              return BubbleSend(message: data, user: user);
            } else {
              return BubbleReceive(message: data, user: user);
            }
          },
        )),
        Padding(
          padding: const EdgeInsets.all(8.0),
          child: Row(
            children: [
              Expanded(
                child: TextField(
                  controller: _inputController,
                  onSubmitted: (value) {
                    _send();
                  },
                  decoration: const InputDecoration(
                    border: OutlineInputBorder(),
                    labelText: 'Enter message',
                  ),
                ),
              ),
              IconButton(
                icon: Icon(Icons.send),
                onPressed: () {
                  _send();
                },
              ),
            ],
          ),
        ),
      ]),
    );
  }

  void _connect() async {
    try {
      _socket = await Socket.connect("127.0.0.1", 7654);
      address = "${_socket.address.address}:${_socket.port}";
      print("my address: $address");
      toast("Connected to 127.0.0.1:7654", 0);

      _socket.listen(
        (data) {
          final message = String.fromCharCodes(data).trim();
          print('received: $message');
          if (message[0] == '!') {
            String name = "";
            for (int i = 1; i < message.length; i++) {
              name += message[i];
            }
            address = name;
          } else {
            setState(() {
              _msgs.addAll(message.split('\n'));
            });
            // print("_msgs: $_msgs");
          }
        },
        onDone: () {
          print('Server disconnected.');
          toast('Server disconnected', 1);
          _socket.destroy();
        },
        onError: (error) {
          print('Error: $error');
          toast('Error: $error', 1);
          _socket.destroy();
        },
      );
    } catch (e) {
      print('Error: $e');
      toast('An unexpected error occurred: $e', 1);
    }
  }

  void _send() {
    final value = _inputController.text;
    if (value.isNotEmpty) {
      _socket.write('$value\n');
      _inputController.clear();
    }
  }

  void toast(String msg, int type) {
    Color bg = Color(0x7aa2f7ff);
    Color fg = Colors.black;
    switch (type) {
      case 0:
        bg = Colors.green;
        break;
      case 1:
        bg = Colors.red;
        break;
    }
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
      content: Text(msg, style: TextStyle(color: fg)),
      backgroundColor: bg,
    ));
  }
}

class BubbleReceive extends StatelessWidget {
  final String message;
  final String user;
  const BubbleReceive({super.key, required this.message, required this.user});

  @override
  Widget build(BuildContext context) {
    return Column(
        mainAxisAlignment: MainAxisAlignment.end,
        crossAxisAlignment: CrossAxisAlignment.end,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.end,
            crossAxisAlignment: CrossAxisAlignment.end,
            children: [
              Flexible(
                child: Container(
                  padding: EdgeInsets.all(15),
                  decoration: BoxDecoration(
                    color: Colors.blueGrey,
                    borderRadius: BorderRadius.circular(15),
                  ),
                  child: Text(
                    message,
                    style: const TextStyle(color: Colors.white, fontSize: 15),
                  ),
                ),
              ),
              SizedBox(
                width: 20,
                height: 20,
                child: CustomPaint(painter: Triangle(false, Colors.blueGrey)),
              ),
            ],
          ),
          Text(user),
          SizedBox(height: 10),
        ]);
  }
}

class BubbleSend extends StatelessWidget {
  final String message;
  final String user;
  const BubbleSend({super.key, required this.message, required this.user});

  @override
  Widget build(BuildContext context) {
    return Column(
        mainAxisAlignment: MainAxisAlignment.start,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.start,
            crossAxisAlignment: CrossAxisAlignment.end,
            children: [
              SizedBox(
                width: 20,
                height: 20,
                child: CustomPaint(painter: Triangle(true, Colors.indigo)),
              ),
              Container(
                padding: EdgeInsets.all(15),
                decoration: BoxDecoration(
                  color: Colors.indigo,
                  borderRadius: BorderRadius.circular(15),
                ),
                child: Text(
                  message,
                  style: const TextStyle(color: Colors.white, fontSize: 15),
                ),
              ),
            ],
          ),
          Text(user),
          SizedBox(height: 10),
        ]);
  }
}

class Triangle extends CustomPainter {
  final Color backgroundColor;
  final bool send;
  Triangle(this.send, this.backgroundColor);

  @override
  void paint(Canvas canvas, Size size) {
    var paint = Paint()..color = backgroundColor;

    var path = Path();
    if (send) {
      path.moveTo(20, 0);
      path.lineTo(5, 15);
      path.lineTo(35, 15);
    } else {
      path.lineTo(15, 15);
      path.lineTo(-15, 15);
    }
    path.close();
    canvas.drawPath(path, paint);
  }

  @override
  bool shouldRepaint(CustomPainter oldDelegate) {
    return false;
  }
}