using System.IO;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace WpfApp1
{
    using System;
    using System.Collections.ObjectModel;
    using System.Linq;
    using System.Windows.Controls;

    using CommunityToolkit.Mvvm.ComponentModel;
    using CommunityToolkit.Mvvm.Input;

    public class MainWindowViewModel : ObservableObject
    {
        private RelayCommand _openDialogCommand;
        private IRelayCommand _testMultiStreamingCommand;

        public IRelayCommand OpenDialogCommand =>
            _openDialogCommand ??= new RelayCommand(OpenDialog);

        public ReadOnlyObservableCollection<UserControl> Dialogs => DialogService.Instance.Dialogs;

        public IRelayCommand TestMultiStreamingCommand =>
            _testMultiStreamingCommand ??= new AsyncRelayCommand(TestMultiStreaming);

        private async Task TestMultiStreaming()
        {
            try
            {
                const string path = @"C:\Users\Holger\Desktop\WpfApp1.txt";
                using var openFile1 = new FileStream(
                    path,
                    FileMode.Create,
                    FileAccess.Write,
                    FileShare.ReadWrite
                );
                using var writer1 = new StreamWriter(openFile1, Encoding.Unicode);
                await writer1.WriteLineAsync($"{DateTime.Now:O} Hello from Writer 1");
                await writer1.FlushAsync();
                using var openFile2 = new FileStream(
                    path,
                    FileMode.Open,
                    FileAccess.Read,
                    FileShare.ReadWrite
                );
                using var reader = new StreamReader(openFile2, Encoding.Unicode);
                var content = await reader.ReadToEndAsync();
                MessageBox.Show(content);
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message);
            }
        }

        private static void OpenDialog()
        {
            DialogService.Instance.Add(
                new DialogFrame(
                    "Main dialog",
                    "Main dialog"
                        + string.Join(
                            Environment.NewLine,
                            Enumerable.Repeat(Environment.OSVersion, 10)
                        )
                )
            );
        }
    }
}