WindowStateService.cs

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using Dreamine.MVVM.Interfaces.Windows;
using System;
using System.Collections.Concurrent;
 
namespace Dreamine.MVVM.Wpf
{
    public sealed class WindowStateService : IWindowStateService
    {
        private readonly ConcurrentDictionary<string, bool> _states = new();

        public event EventHandler<WindowStateChangedEventArgs>? StateChanged;

        public bool IsOpen(string windowKey)
        {
            ValidateWindowKey(windowKey);
 
            return _states.TryGetValue(windowKey, out bool isOpen) && isOpen;
        }

        public void MarkOpened(string windowKey)
        {
            SetState(windowKey, true);
        }

        public void MarkClosed(string windowKey)
        {
            SetState(windowKey, false);
        }

        private void SetState(string windowKey, bool isOpen)
        {
            ValidateWindowKey(windowKey);
 
            _states[windowKey] = isOpen;
            StateChanged?.Invoke(this, new WindowStateChangedEventArgs(windowKey, isOpen));
        }

        private static void ValidateWindowKey(string windowKey)
        {
            if (string.IsNullOrWhiteSpace(windowKey))
            {
                throw new ArgumentException("Window key must not be empty.", nameof(windowKey));
            }
        }
    }
}