TermRemoteCtl/apps/mobile_app/lib/features/terminal/terminal_interaction_controller.dart

import 'package:flutter/foundation.dart';

import 'history_window.dart';

enum TerminalConnectionState {
  connecting,
  connected,
  reconnecting,
  disconnected,
}

class TerminalInteractionController extends ChangeNotifier {
  TerminalInteractionController({
    HistoryWindow historyWindow = const HistoryWindow(
      lines: <String>[],
      hasMoreAbove: false,
    ),
  }) : _historyWindow = historyWindow;

  TerminalConnectionState _connectionState = TerminalConnectionState.connecting;
  bool _isFollowingLiveOutput = true;
  bool _hasPendingLiveOutput = false;
  HistoryWindow _historyWindow;
  final List<String> _liveLines = <String>[];

  TerminalConnectionState get connectionState => _connectionState;

  bool get isFollowingLiveOutput => _isFollowingLiveOutput;

  bool get hasPendingLiveOutput => _hasPendingLiveOutput;

  bool get canSendInput => _connectionState == TerminalConnectionState.connected;

  HistoryWindow get historyWindow => _historyWindow;

  List<String> get liveLines => List.unmodifiable(_liveLines);

  void markConnecting() {
    _connectionState = TerminalConnectionState.connecting;
    notifyListeners();
  }

  void markConnected() {
    _connectionState = TerminalConnectionState.connected;
    notifyListeners();
  }

  void markReconnecting() {
    _connectionState = TerminalConnectionState.reconnecting;
    notifyListeners();
  }

  void markDisconnected() {
    _connectionState = TerminalConnectionState.disconnected;
    notifyListeners();
  }

  void enterScrollback() {
    _isFollowingLiveOutput = false;
    notifyListeners();
  }

  void jumpToLive() {
    _isFollowingLiveOutput = true;
    _hasPendingLiveOutput = false;
    notifyListeners();
  }

  void registerIncomingFrame() {
    if (!_isFollowingLiveOutput) {
      _hasPendingLiveOutput = true;
      notifyListeners();
    }
  }

  void applyFrame(String chunk) {
    _liveLines.add(chunk);
    notifyListeners();
  }

  void loadHistory(HistoryWindow historyWindow) {
    _historyWindow = historyWindow;
    _liveLines
      ..clear()
      ..addAll(historyWindow.lines);
    _hasPendingLiveOutput = false;
    notifyListeners();
  }
}