using System.Globalization;
using Microsoft.Win32;
using CommunityToolkit.Mvvm.Input;
using Microsoft.Extensions.Logging;
using SharepointToolbox.Core.Models;
using SharepointToolbox.Localization;
using SharepointToolbox.Services;

namespace SharepointToolbox.ViewModels.Tabs;

public partial class SettingsViewModel : FeatureViewModelBase
{
    private readonly SettingsService _settingsService;

    private string _selectedLanguage = "en";
    public string SelectedLanguage
    {
        get => _selectedLanguage;
        set
        {
            if (_selectedLanguage == value) return;
            _selectedLanguage = value;
            OnPropertyChanged();
            _ = ApplyLanguageAsync(value);
        }
    }

    private string _dataFolder = string.Empty;
    public string DataFolder
    {
        get => _dataFolder;
        set
        {
            if (_dataFolder == value) return;
            _dataFolder = value;
            OnPropertyChanged();
            _ = _settingsService.SetDataFolderAsync(value);
        }
    }

    public RelayCommand BrowseFolderCommand { get; }

    public SettingsViewModel(SettingsService settingsService, ILogger<FeatureViewModelBase> logger)
        : base(logger)
    {
        _settingsService = settingsService;
        BrowseFolderCommand = new RelayCommand(BrowseFolder);
    }

    public async Task LoadAsync()
    {
        var settings = await _settingsService.GetSettingsAsync();
        _selectedLanguage = settings.Lang;
        _dataFolder = settings.DataFolder;
        OnPropertyChanged(nameof(SelectedLanguage));
        OnPropertyChanged(nameof(DataFolder));
    }

    private async Task ApplyLanguageAsync(string code)
    {
        try
        {
            TranslationSource.Instance.CurrentCulture = new CultureInfo(code);
            await _settingsService.SetLanguageAsync(code);
        }
        catch (Exception ex)
        {
            StatusMessage = ex.Message;
        }
    }

    private void BrowseFolder()
    {
        // OpenFolderDialog is available in .NET 8+ via Microsoft.Win32
        var dialog = new OpenFolderDialog
        {
            Title = "Select data output folder",
            InitialDirectory = string.IsNullOrEmpty(_dataFolder)
                ? Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
                : _dataFolder
        };

        if (dialog.ShowDialog() == true)
        {
            DataFolder = dialog.FolderName;
        }
    }

    protected override Task RunOperationAsync(CancellationToken ct, IProgress<OperationProgress> progress)
    {
        // Settings tab has no long-running operation
        throw new NotSupportedException("Settings tab does not have a run operation.");
    }
}