tm_app/lib/view_models/board_view_model.dart

import 'package:flutter/material.dart';

import '../core/enums/task_status.dart';
import '../core/utils/result.dart';
import '../data/repositories/board_repositories.dart';
import '../data/services/model/board_response/board_response.dart';

class BoardViewModel with ChangeNotifier {
  final BoardRepository _boardRepository;
  BoardViewModel({required BoardRepository boardRepository})
    : _boardRepository = boardRepository;

  bool _isLoading = false;
  String? _errorMessage;
  List<BoardData> _boardData = [];

  bool get isLoading => _isLoading;
  String? get errorMessage => _errorMessage;
  List<BoardData> get boardData => _boardData;
  bool get hasData => _boardData.isNotEmpty;

  Future<void> getBoard() async {
    _isLoading = true;
    notifyListeners();

    final result = await _boardRepository.getBoard();

    switch (result) {
      case Ok<BoardResponse>():
        // تبدیل به لیست قابل تغییر
        _boardData = List.from(result.value.data ?? []);
        break;
      case Error<BoardResponse>():
        _errorMessage = result.error.toString();
        break;
    }
    _isLoading = false;
    notifyListeners();
  }

  // update task status
  void updateTaskStatus(String taskId, String newStatus) {
    final taskIndex = _boardData.indexWhere((task) => task.id == taskId);
    if (taskIndex != -1) {
      _boardData[taskIndex] = _boardData[taskIndex].copyWith(status: newStatus);
      notifyListeners();
    }
  }

  bool isValidMove(TaskStatus currentStatus, TaskStatus targetStatus) {
    if (currentStatus == TaskStatus.toDo) {
      return targetStatus == TaskStatus.inProgress;
    } else if (currentStatus == TaskStatus.inProgress) {
      return targetStatus == TaskStatus.toDo || targetStatus == TaskStatus.done;
    } else if (currentStatus == TaskStatus.done) {
      return targetStatus == TaskStatus.inProgress;
    }
    return false;
  }

  List<BoardData> getTasksByStatus(TaskStatus status) {
    return boardData.where((task) => task.status == status.value).toList();
  }

  void _updateTaskStatus(BoardData task, TaskStatus newStatus) {
    if (task.status == newStatus.value) {
      return;
    }

    final oldStatus = task.status;

    // update task status in ViewModel
    updateTaskStatus(task.id!, newStatus.value);

    // _showStatusChangeMessage(context, task, oldStatus, newStatus);
  }
}