// 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.Text.Json;
using System.Text.Json.Serialization;
using Roslyn.Core.Imaging;
using Roslyn.Text.Adornments;
 
namespace Roslyn.LanguageServer.Protocol;
internal class ImageElementConverter : JsonConverter<ImageElement>
{
    public static readonly ImageElementConverter Instance = new();
 
    public override ImageElement Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        if (reader.TokenType == JsonTokenType.StartObject)
        {
            ImageId? imageId = null;
            string? automationName = null;
 
            while (reader.Read())
            {
                if (reader.TokenType == JsonTokenType.EndObject)
                {
                    imageId ??= imageId ?? throw new JsonException();
                    return automationName is null ? new ImageElement(imageId.Value) : new ImageElement(imageId.Value, automationName);
                }
 
                if (reader.TokenType == JsonTokenType.PropertyName)
                {
                    var propertyName = reader.GetString();
                    reader.Read();
                    switch (propertyName)
                    {
                        case nameof(ImageElement.ImageId):
                            imageId = ImageIdConverter.Instance.Read(ref reader, typeof(ImageId), options);
                            break;
                        case nameof(ImageElement.AutomationName):
                            automationName = reader.GetString();
                            break;
                        case ObjectContentConverter.TypeProperty:
                            if (reader.GetString() != nameof(ImageElement))
                                throw new JsonException($"Expected {ObjectContentConverter.TypeProperty} property value {nameof(ImageElement)}");
                            break;
                        default:
                            reader.Skip();
                            break;
                    }
                }
            }
        }
 
        throw new JsonException("Expected start object or null tokens");
    }
 
    public override void Write(Utf8JsonWriter writer, ImageElement value, JsonSerializerOptions options)
    {
        writer.WriteStartObject();
        writer.WritePropertyName(nameof(ImageElement.ImageId));
        ImageIdConverter.Instance.Write(writer, value.ImageId, options);
        writer.WriteString(nameof(ImageElement.AutomationName), value.AutomationName);
        writer.WriteString(ObjectContentConverter.TypeProperty, nameof(ImageElement));
        writer.WriteEndObject();
    }
}