﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#nullable disable

using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.CodeStyle;
using Microsoft.CodeAnalysis.Options;

namespace Microsoft.VisualStudio.LanguageServices.Implementation.Options
{
    /// <summary>
    /// This class represents the view model for a <see cref="CodeStyleOption2{T}"/>
    /// that binds to the codestyle options UI.
    /// </summary>
    internal class BooleanCodeStyleOptionViewModel : AbstractCodeStyleOptionViewModel
    {
        private readonly string _truePreview;
        private readonly string _falsePreview;

        private CodeStylePreference _selectedPreference;
        private NotificationOptionViewModel _selectedNotificationPreference;

        public BooleanCodeStyleOptionViewModel(
            IOption2 option,
            string description,
            string truePreview,
            string falsePreview,
            AbstractOptionPreviewViewModel info,
            OptionStore optionStore,
            string groupName,
            List<CodeStylePreference> preferences = null,
            List<NotificationOptionViewModel> notificationPreferences = null)
            : base(option, description, info, groupName, preferences, notificationPreferences)
        {
            _truePreview = truePreview;
            _falsePreview = falsePreview;

            var codeStyleOption = optionStore.GetOption<CodeStyleOption2<bool>>(option, option.IsPerLanguage ? info.Language : null);
            _selectedPreference = Preferences.Single(c => c.IsChecked == codeStyleOption.Value);

            var notificationViewModel = NotificationPreferences.Single(i => i.Notification.Severity == codeStyleOption.Notification.Severity);
            _selectedNotificationPreference = NotificationPreferences.Single(p => p.Notification.Severity == notificationViewModel.Notification.Severity);

            NotifyPropertyChanged(nameof(SelectedPreference));
            NotifyPropertyChanged(nameof(SelectedNotificationPreference));
        }

        public override CodeStylePreference SelectedPreference
        {
            get => _selectedPreference;

            set
            {
                if (SetProperty(ref _selectedPreference, value))
                {
                    Info.SetOptionAndUpdatePreview(new CodeStyleOption2<bool>(_selectedPreference.IsChecked, _selectedNotificationPreference.Notification), Option, GetPreview());
                }
            }
        }

        public override NotificationOptionViewModel SelectedNotificationPreference
        {
            get => _selectedNotificationPreference;

            set
            {
                if (SetProperty(ref _selectedNotificationPreference, value))
                {
                    Info.SetOptionAndUpdatePreview(new CodeStyleOption2<bool>(_selectedPreference.IsChecked, _selectedNotificationPreference.Notification), Option, GetPreview());
                }
            }
        }

        public override string GetPreview()
            => SelectedPreference.IsChecked ? _truePreview : _falsePreview;
    }
}
