// 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.
 
using System;
using System.Collections.Immutable;
using System.Diagnostics;
using Microsoft.VisualStudio.Shell.Interop;
 
namespace Microsoft.CodeAnalysis.ColorSchemes;
 
internal partial class ColorSchemeApplier
{
    /// <summary>
    /// A ColorSchemeName represents a style to be applied to VS themes in 
    /// order to emphasize some aspect of the source code. For instance
    /// C++ has an 'Enhanced (Globals vs. Members)' scheme to emphasize
    /// a distinction between where identifiers are declared.
    /// </summary>
    private class ColorScheme
    {
        public ImmutableArray<ColorTheme> Themes { get; }
 
        public ColorScheme(ImmutableArray<ColorTheme> themes)
            => Themes = themes;
    }
 
    /// <summary>
    /// A ColorTheme contains a scheme's colors for a particular VS theme.
    /// </summary>
    private class ColorTheme
    {
        public string Name { get; }
        public Guid Guid { get; }
        public ColorCategory Category { get; }
 
        public ColorTheme(string name, Guid guid, ColorCategory category)
        {
            Name = name;
            Guid = guid;
            Category = category;
        }
    }
 
    private class ColorCategory
    {
        public string Name { get; }
        public Guid Guid { get; }
        public ImmutableArray<ColorItem> Colors { get; }
 
        public ColorCategory(string name, Guid guid, ImmutableArray<ColorItem> colors)
        {
            Name = name;
            Guid = guid;
            Colors = colors;
        }
    }
 
    private class ColorItem
    {
        public string Name { get; }
        public __VSCOLORTYPE BackgroundType { get; }
        public uint? Background { get; }
        public __VSCOLORTYPE ForegroundType { get; }
        public uint? Foreground { get; }
 
        public ColorItem(string name, __VSCOLORTYPE backgroundType, uint? background, __VSCOLORTYPE foregroundType, uint? foreground)
        {
            Name = name;
 
            Debug.Assert(backgroundType == __VSCOLORTYPE.CT_INVALID || background.HasValue);
            BackgroundType = backgroundType;
            Background = background;
 
            Debug.Assert(foregroundType == __VSCOLORTYPE.CT_INVALID || foreground.HasValue);
            ForegroundType = foregroundType;
            Foreground = foreground;
        }
    }
}