JWLMerge/JWLMerge/Services/WindowService.cs

namespace JWLMerge.Services
{
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;
    using BackupFileServices;
    using ViewModel;

    // ReSharper disable once ClassNeverInstantiated.Global
    internal sealed class WindowService : IWindowService
    {
        private readonly List<DetailWindow> _detailWindows;

        public WindowService()
        {
            _detailWindows = new List<DetailWindow>();
        }

        public void ShowDetailWindow(
            IBackupFileService backupFileService, 
            string filePath,
            bool notesRedacted)
        {
            var existingWindow = GetDetailWindow(filePath);
            if (existingWindow != null)
            {
                existingWindow.Activate();
            }
            else
            {
                var window = CreateDetailWindow(backupFileService, filePath, notesRedacted);
                
                var viewModel = (DetailViewModel)window.DataContext;
                viewModel.SelectedDataType = viewModel.ListItems.FirstOrDefault();
                window.Show();
            }
        }

        public void Close(string filePath)
        {
            var window = GetDetailWindow(filePath);
            window?.Close();
        }

        public void CloseAll()
        {
            foreach (var window in Enumerable.Reverse(_detailWindows))
            {
                window.Close();
            }
        }

        private DetailWindow CreateDetailWindow(
            IBackupFileService backupFileService, 
            string filePath,
            bool notesRedacted)
        {
            var window = new DetailWindow();
            var viewModel = (DetailViewModel)window.DataContext;
            viewModel.FilePath = filePath;
            viewModel.BackupFile = backupFileService.Load(filePath);
            viewModel.NotesRedacted = notesRedacted;

            window.Closed += DetailWindowClosed;
            _detailWindows.Add(window);
            return window;
        }

        private void DetailWindowClosed(object? sender, EventArgs e)
        {
            var window = (DetailWindow?)sender;
            if (window != null)
            {
                _detailWindows.Remove(window);
                window.Closed -= DetailWindowClosed;
            }
        }

        private DetailWindow? GetDetailWindow(string filePath)
        {
            if (string.IsNullOrEmpty(filePath))
            {
                return null;
            }

            foreach (var window in _detailWindows)
            {
                var path = ((DetailViewModel)window.DataContext).FilePath;
                if (!string.IsNullOrEmpty(path) && IsSameFile(path, filePath))
                {
                    return window;
                }
            }

            return null;
        }

        private static bool IsSameFile(string path1, string path2)
        {
            return Path.GetFullPath(path1).Equals(Path.GetFullPath(path2), StringComparison.OrdinalIgnoreCase);
        }
    }
}