import 'dart:convert';

import 'package:dash_chat/dash_chat.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hbb/pages/chat_page.dart';

import 'model.dart';

class ChatModel with ChangeNotifier {
  // -1作为客户端模式的id，客户端模式下此id唯一
  // 其它正整数的id，来自被控服务器模式下的其他客户端的id，每个客户端有不同的id
  // 注意 此id和peer_id不同，服务端模式下的id等同于conn的顺序累加id
  static final clientModeID = -1;

  final Map<int, List<ChatMessage>> _messages = Map()..[clientModeID] = [];

  final ChatUser me = ChatUser(
    uid:"",
    name: "me",
  );

  final _scroller = ScrollController();

  var _currentID = clientModeID;

  ScrollController get scroller => _scroller;

  Map<int, List<ChatMessage>> get messages => _messages;

  int get currentID => _currentID;

  changeCurrentID(int id){
    if(_messages.containsKey(id)){
      _currentID = id;
      notifyListeners();
    }
  }

  receive(int id, String text) {
    if (text.isEmpty) return;
    // first message show overlay icon
    if (iconOverlayEntry == null) {
      showChatIconOverlay();
    }
    late final chatUser;
    if(id == clientModeID){
      chatUser = ChatUser(
        name: FFI.ffiModel.pi.username,
        uid: FFI.getId(),
      );
    }else{
      chatUser = FFI.serverModel.clients[id]?.chatUser;
    }
    if(chatUser == null){
      return debugPrint("Failed to receive msg,user doesn't exist");
    }
    if(!_messages.containsKey(id)){
      _messages[id] = [];
    }
    _messages[id]!.add(ChatMessage(
        text: text,
        user: chatUser));
    _currentID = id;
    notifyListeners();
    scrollToBottom();
  }

  scrollToBottom(){
    Future.delayed(Duration(milliseconds: 500), () {
      _scroller.animateTo(
          _scroller.position.maxScrollExtent,
          duration: Duration(milliseconds: 200),
          curve: Curves.fastLinearToSlowEaseIn);
    });
  }

  send(ChatMessage message) {
    if (message.text != null && message.text!.isNotEmpty) {
      _messages[_currentID]?.add(message);
      if (_currentID == clientModeID) {
        FFI.setByName("chat_client_mode", message.text!);
      } else {
        final msg = Map()
          ..["id"] = _currentID
          ..["text"] = message.text!;
        FFI.setByName("chat_server_mode", jsonEncode(msg));
      }
    }
    notifyListeners();
    scrollToBottom();
  }

  close() {
    hideChatIconOverlay();
    hideChatWindowOverlay();
    notifyListeners();
  }
}