// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.

using System.Collections.Generic;
using System.Linq;
using Microsoft.CodeAnalysis.CodeStyle;
using Microsoft.CodeAnalysis.Options;
using Microsoft.VisualStudio.Imaging;
using Microsoft.VisualStudio.LanguageServices.Implementation.Utilities;

namespace Microsoft.VisualStudio.LanguageServices.Implementation.Options
{
    /// <summary>
    /// This class acts as a base for any view model that 
    /// binds to the codestyle options UI.
    /// </summary>
    /// <remarks>
    /// This supports databinding of: 
    /// Description
    /// list of CodeStyle preferences
    /// list of Notification preferences 
    /// selected code style preference
    /// selected notification preference
    /// plus, styling for visual elements.
    /// </remarks>
    internal abstract class AbstractCodeStyleOptionViewModel : AbstractNotifyPropertyChanged
    {
        private readonly string _truePreview;
        private readonly string _falsePreview;
        protected AbstractOptionPreviewViewModel Info { get; }
        public IOption Option { get; }

        public string Description { get; set; }
        public double DescriptionMargin { get; set; }
        public string GroupName { get; set; }
        public abstract CodeStylePreference SelectedPreference { get; set; }
        public List<CodeStylePreference> Preferences { get; set; }
        public List<NotificationOptionViewModel> NotificationPreferences { get; set; }
        public abstract bool NotificationsAvailable { get; }

        public virtual string GetPreview() => SelectedPreference.IsChecked ? _truePreview : _falsePreview;
        public virtual NotificationOptionViewModel SelectedNotificationPreference
        {
            get { return NotificationPreferences.First(); }
            set { }
        }

        public AbstractCodeStyleOptionViewModel(
            IOption option,
            string description,
            string truePreview,
            string falsePreview,
            AbstractOptionPreviewViewModel info,
            OptionSet options,
            string groupName,
            List<CodeStylePreference> preferences = null,
            List<NotificationOptionViewModel> notificationPreferences = null)
        {
            _truePreview = truePreview;
            _falsePreview = falsePreview;

            Info = info;
            Option = option;
            Description = description;
            Preferences = preferences ?? GetDefaultPreferences();
            NotificationPreferences = notificationPreferences ?? GetDefaultNotifications();
            DescriptionMargin = 12d;
            GroupName = groupName;
        }

        private static List<NotificationOptionViewModel> GetDefaultNotifications()
        {
            return new List<NotificationOptionViewModel>
            {
                new NotificationOptionViewModel(NotificationOption.None, KnownMonikers.None),
                new NotificationOptionViewModel(NotificationOption.Suggestion, KnownMonikers.StatusInformation),
                new NotificationOptionViewModel(NotificationOption.Warning, KnownMonikers.StatusWarning),
                new NotificationOptionViewModel(NotificationOption.Error, KnownMonikers.StatusError)
            };
        }

        private static List<CodeStylePreference> GetDefaultPreferences()
        {
            return new List<CodeStylePreference>
            {
                new CodeStylePreference(ServicesVSResources.Yes, isChecked: true),
                new CodeStylePreference(ServicesVSResources.No, isChecked: false),
            };
        }

    }
}