CounterEvent.cs

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using System;
using System.Collections.ObjectModel;
using SampleCrossUi.Shared.Models;
using SampleCrossUi.Shared.Services;
 
namespace SampleCrossUi.Shared.ViewModels;

public sealed class CounterEvent
{
    private readonly ICounterService _service;

    public CounterEvent(ICounterService service)
    {
        _service = service ?? throw new ArgumentNullException(nameof(service));
        AddLog("Counter sample started.");
    }

    public int Count { get; private set; }

    public ObservableCollection<CounterLogItem> Logs { get; } = new();

    public event EventHandler? CountChanged;

    public void Increment()
    {
        Count = _service.Increment(Count);
        AddLog($"Incremented → {Count}");
        CountChanged?.Invoke(this, EventArgs.Empty);
    }

    public void Reset()
    {
        Count = _service.Reset();
        AddLog("Counter reset.");
        CountChanged?.Invoke(this, EventArgs.Empty);
    }

    private void AddLog(string message)
    {
        Logs.Insert(0, new CounterLogItem(DateTime.Now, message));
    }
}