Catalog/imagecatalog/Controls/PathPickerField.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Data;
using Avalonia.Platform.Storage;
using ImageCatalog_2.Services;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace ImageCatalog_2.Controls;

public partial class PathPickerField : UserControl
{
    private readonly PickerPreferenceService _pickerPreferenceService;

    public static readonly StyledProperty<string> LabelProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(Label), string.Empty);

    public static readonly StyledProperty<string> TextProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(Text), string.Empty, defaultBindingMode: BindingMode.TwoWay);

    public static readonly StyledProperty<string> WatermarkProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(Watermark), string.Empty);

    public static readonly StyledProperty<string> PreferenceKeyProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(PreferenceKey), string.Empty);

    public static readonly StyledProperty<string> PickerTitleProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(PickerTitle), string.Empty);

    public static readonly StyledProperty<string> FileTypeNameProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(FileTypeName), string.Empty);

    public static readonly StyledProperty<string> FilePatternsProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(FilePatterns), string.Empty);

    public static readonly StyledProperty<string> DefaultExtensionProperty =
        AvaloniaProperty.Register<PathPickerField, string>(nameof(DefaultExtension), string.Empty);

    public static readonly StyledProperty<PathPickerSelectionMode> PickerModeProperty =
        AvaloniaProperty.Register<PathPickerField, PathPickerSelectionMode>(nameof(PickerMode), PathPickerSelectionMode.Folder);

    public static readonly StyledProperty<bool> IsTextReadOnlyProperty =
        AvaloniaProperty.Register<PathPickerField, bool>(nameof(IsTextReadOnly), false);

    public static readonly StyledProperty<bool> ShowPickerButtonProperty =
        AvaloniaProperty.Register<PathPickerField, bool>(nameof(ShowPickerButton), true);

    public static readonly StyledProperty<bool> AppendDirectorySeparatorProperty =
        AvaloniaProperty.Register<PathPickerField, bool>(nameof(AppendDirectorySeparator), false);

    public PathPickerField()
    {
        _pickerPreferenceService = Program.ServiceProvider.GetRequiredService<PickerPreferenceService>();
        InitializeComponent();
    }

    public string Label
    {
        get => GetValue(LabelProperty);
        set => SetValue(LabelProperty, value);
    }

    public string Text
    {
        get => GetValue(TextProperty);
        set => SetValue(TextProperty, value);
    }

    public string Watermark
    {
        get => GetValue(WatermarkProperty);
        set => SetValue(WatermarkProperty, value);
    }

    public string PreferenceKey
    {
        get => GetValue(PreferenceKeyProperty);
        set => SetValue(PreferenceKeyProperty, value);
    }

    public string PickerTitle
    {
        get => GetValue(PickerTitleProperty);
        set => SetValue(PickerTitleProperty, value);
    }

    public string FileTypeName
    {
        get => GetValue(FileTypeNameProperty);
        set => SetValue(FileTypeNameProperty, value);
    }

    public string FilePatterns
    {
        get => GetValue(FilePatternsProperty);
        set => SetValue(FilePatternsProperty, value);
    }

    public string DefaultExtension
    {
        get => GetValue(DefaultExtensionProperty);
        set => SetValue(DefaultExtensionProperty, value);
    }

    public PathPickerSelectionMode PickerMode
    {
        get => GetValue(PickerModeProperty);
        set => SetValue(PickerModeProperty, value);
    }

    public bool IsTextReadOnly
    {
        get => GetValue(IsTextReadOnlyProperty);
        set => SetValue(IsTextReadOnlyProperty, value);
    }

    public bool ShowPickerButton
    {
        get => GetValue(ShowPickerButtonProperty);
        set => SetValue(ShowPickerButtonProperty, value);
    }

    public bool AppendDirectorySeparator
    {
        get => GetValue(AppendDirectorySeparatorProperty);
        set => SetValue(AppendDirectorySeparatorProperty, value);
    }

    private async void PickPath_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        var topLevel = TopLevel.GetTopLevel(this);
        var storageProvider = topLevel?.StorageProvider;
        if (storageProvider is null)
        {
            return;
        }

        var selectedPath = await PickPathAsync(storageProvider);
        if (string.IsNullOrWhiteSpace(selectedPath))
        {
            return;
        }

        Text = selectedPath;

        if (!string.IsNullOrWhiteSpace(PreferenceKey))
        {
            _pickerPreferenceService.RememberPath(PreferenceKey, selectedPath);
        }
    }

    private void OpenPath_Click(object? sender, Avalonia.Interactivity.RoutedEventArgs e)
    {
        PathShellService.OpenInExplorer(Text);
    }

    private async Task<string?> PickPathAsync(IStorageProvider storageProvider)
    {
        var suggestedStartLocation = await TryGetSuggestedStartLocationAsync(storageProvider);
        var pickerTitle = ResolvePickerTitle();

        switch (PickerMode)
        {
            case PathPickerSelectionMode.Folder:
                {
                    var folders = await storageProvider.OpenFolderPickerAsync(new FolderPickerOpenOptions
                    {
                        Title = pickerTitle,
                        SuggestedStartLocation = suggestedStartLocation
                    });

                    return folders.Count == 0
                        ? null
                        : NormalizeSelectedPath(folders[0].Path.LocalPath);
                }
            case PathPickerSelectionMode.OpenFile:
                {
                    var files = await storageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
                    {
                        Title = pickerTitle,
                        SuggestedStartLocation = suggestedStartLocation,
                        FileTypeFilter = BuildFileTypes()
                    });

                    return files.Count == 0
                        ? null
                        : files[0].Path.LocalPath;
                }
            case PathPickerSelectionMode.SaveFile:
                {
                    var file = await storageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
                    {
                        Title = pickerTitle,
                        SuggestedStartLocation = suggestedStartLocation,
                        DefaultExtension = NormalizeDefaultExtension(DefaultExtension),
                        FileTypeChoices = BuildFileTypes()
                    });

                    return file?.Path.LocalPath;
                }
            default:
                return null;
        }
    }

    private async Task<IStorageFolder?> TryGetSuggestedStartLocationAsync(IStorageProvider storageProvider)
    {
        if (string.IsNullOrWhiteSpace(PreferenceKey))
        {
            return null;
        }

        return await _pickerPreferenceService.TryGetStartFolderAsync(storageProvider, PreferenceKey, Text);
    }

    private IReadOnlyList<FilePickerFileType> BuildFileTypes()
    {
        var patterns = (FilePatterns ?? string.Empty)
            .Split(';', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);

        if (patterns.Length == 0)
        {
            return Array.Empty<FilePickerFileType>();
        }

        var fileTypeName = string.IsNullOrWhiteSpace(FileTypeName)
            ? "File"
            : FileTypeName.Trim();

        return
        [
            new FilePickerFileType(fileTypeName)
            {
                Patterns = patterns.ToList()
            }
        ];
    }

    private string ResolvePickerTitle()
    {
        if (!string.IsNullOrWhiteSpace(PickerTitle))
        {
            return PickerTitle;
        }

        var cleanedLabel = string.IsNullOrWhiteSpace(Label)
            ? "percorso"
            : Label.Trim().TrimEnd(':');

        return PickerMode == PathPickerSelectionMode.SaveFile
            ? $"Salva {cleanedLabel.ToLowerInvariant()}"
            : $"Seleziona {cleanedLabel.ToLowerInvariant()}";
    }

    private string NormalizeSelectedPath(string selectedPath)
    {
        if (PickerMode != PathPickerSelectionMode.Folder || !AppendDirectorySeparator)
        {
            return selectedPath;
        }

        if (string.IsNullOrWhiteSpace(selectedPath))
        {
            return string.Empty;
        }

        return selectedPath.EndsWith(Path.DirectorySeparatorChar)
            || selectedPath.EndsWith(Path.AltDirectorySeparatorChar)
            ? selectedPath
            : selectedPath + Path.DirectorySeparatorChar;
    }

    private static string NormalizeDefaultExtension(string extension)
    {
        if (string.IsNullOrWhiteSpace(extension))
        {
            return string.Empty;
        }

        return extension.Trim().TrimStart('.');
    }
}