Catalog/imagecatalog/Services/PickerPreferenceService.cs

using Avalonia.Platform.Storage;
using ImageCatalog;
using System;
using System.IO;
using System.Threading.Tasks;

namespace ImageCatalog_2.Services;

public static class PickerPreferenceKeys
{
    public const string SourceFolder = "Picker.SourceFolder.LastPath";
    public const string DestinationFolder = "Picker.DestinationFolder.LastPath";
    public const string LogoFile = "Picker.LogoFile.LastPath";
    public const string ModelsFolder = "Picker.ModelsFolder.LastPath";
    public const string CsvOutput = "Picker.CsvOutput.LastPath";
    public const string FaceExecutableFolder = "Picker.FaceExecutableFolder.LastPath";
    public const string FaceOutputFolder = "Picker.FaceOutputFolder.LastPath";
    public const string FaceMatcherExecutable = "Picker.FaceMatcherExecutable.LastPath";
    public const string FaceMatcherImage = "Picker.FaceMatcherImage.LastPath";
    public const string FaceMatcherEncodings = "Picker.FaceMatcherEncodings.LastPath";
    public const string FaceMatcherOutput = "Picker.FaceMatcherOutput.LastPath";
    public const string FaceMatcherLog = "Picker.FaceMatcherLog.LastPath";
}

public sealed class PickerPreferenceService
{
    private readonly ParametriSetup _userPreferences;

    public PickerPreferenceService(ParametriSetup userPreferences)
    {
        _userPreferences = userPreferences;
    }

    public async Task<IStorageFolder?> TryGetStartFolderAsync(IStorageProvider storageProvider, string preferenceKey, string? currentPath = null)
    {
        var startPath = GetPreferredStartDirectory(preferenceKey, currentPath);
        if (string.IsNullOrWhiteSpace(startPath))
        {
            return null;
        }

        try
        {
            return await storageProvider.TryGetFolderFromPathAsync(new Uri(startPath)).ConfigureAwait(true);
        }
        catch
        {
            return null;
        }
    }

    public void RememberPath(string preferenceKey, string? selectedPath)
    {
        var directory = TryGetExistingDirectory(selectedPath);
        if (string.IsNullOrWhiteSpace(directory))
        {
            return;
        }

        _userPreferences.AggiornaParametro(preferenceKey, directory);
        _userPreferences.SalvaParametriSetup();
    }

    private string? GetPreferredStartDirectory(string preferenceKey, string? currentPath)
    {
        var storedPath = _userPreferences.LeggiParametroString(preferenceKey);
        return TryGetExistingDirectory(storedPath) ?? TryGetExistingDirectory(currentPath);
    }

    private static string? TryGetExistingDirectory(string? path)
    {
        if (string.IsNullOrWhiteSpace(path))
        {
            return null;
        }

        var normalizedPath = path.Trim().Trim('"');
        if (Directory.Exists(normalizedPath))
        {
            return normalizedPath;
        }

        if (File.Exists(normalizedPath))
        {
            return Path.GetDirectoryName(normalizedPath);
        }

        var containingDirectory = Path.GetDirectoryName(normalizedPath);
        return !string.IsNullOrWhiteSpace(containingDirectory) && Directory.Exists(containingDirectory)
            ? containingDirectory
            : null;
    }
}