// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Text.Encodings.Web;
using System.Text.Json;
using Microsoft.AspNetCore.Html;
using Microsoft.Extensions.Options;
 
namespace Microsoft.AspNetCore.Mvc.Rendering;
 
internal sealed class SystemTextJsonHelper : IJsonHelper
{
    private readonly JsonSerializerOptions _htmlSafeJsonSerializerOptions;
 
    public SystemTextJsonHelper(IOptions<JsonOptions> options)
    {
        _htmlSafeJsonSerializerOptions = GetHtmlSafeSerializerOptions(options.Value.JsonSerializerOptions);
    }
 
    /// <inheritdoc />
    public IHtmlContent Serialize(object value)
    {
        // JsonSerializer always encodes non-ASCII chars, so we do not need
        // to do anything special with the SerializerOptions
        var json = JsonSerializer.Serialize(value, _htmlSafeJsonSerializerOptions);
        return new HtmlString(json);
    }
 
    private static JsonSerializerOptions GetHtmlSafeSerializerOptions(JsonSerializerOptions serializerOptions)
    {
        if (serializerOptions.Encoder is null || serializerOptions.Encoder == JavaScriptEncoder.Default)
        {
            return serializerOptions;
        }
 
        return new JsonSerializerOptions(serializerOptions)
        {
            Encoder = JavaScriptEncoder.Default,
        };
    }
}