// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Diagnostics;
using System.Text.Json.Nodes;
using System.Text.Json.Schema;
 
namespace System.Text.Json.Serialization.Converters
{
    internal sealed class DoubleConverter : JsonPrimitiveConverter<double>
    {
        public DoubleConverter()
        {
            IsInternalConverterForNumberType = true;
        }
 
        public override double Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            return reader.GetDouble();
        }
 
        public override void Write(Utf8JsonWriter writer, double value, JsonSerializerOptions options)
        {
            writer.WriteNumberValue(value);
        }
 
        internal override double ReadAsPropertyNameCore(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            Debug.Assert(reader.TokenType == JsonTokenType.PropertyName);
            return reader.GetDoubleWithQuotes();
        }
 
        internal override void WriteAsPropertyNameCore(Utf8JsonWriter writer, double value, JsonSerializerOptions options, bool isWritingExtensionDataProperty)
        {
            writer.WritePropertyName(value);
        }
 
        internal override double ReadNumberWithCustomHandling(ref Utf8JsonReader reader, JsonNumberHandling handling, JsonSerializerOptions options)
        {
            if (reader.TokenType == JsonTokenType.String)
            {
                if ((JsonNumberHandling.AllowReadingFromString & handling) != 0)
                {
                    return reader.GetDoubleWithQuotes();
                }
                else if ((JsonNumberHandling.AllowNamedFloatingPointLiterals & handling) != 0)
                {
                    return reader.GetDoubleFloatingPointConstant();
                }
            }
 
            return reader.GetDouble();
        }
 
        internal override void WriteNumberWithCustomHandling(Utf8JsonWriter writer, double value, JsonNumberHandling handling)
        {
            if ((JsonNumberHandling.WriteAsString & handling) != 0)
            {
                writer.WriteNumberValueAsString(value);
            }
            else if ((JsonNumberHandling.AllowNamedFloatingPointLiterals & handling) != 0)
            {
                writer.WriteFloatingPointConstant(value);
            }
            else
            {
                writer.WriteNumberValue(value);
            }
        }
 
        internal override JsonSchema? GetSchema(JsonNumberHandling numberHandling) =>
                GetSchemaForNumericType(JsonSchemaType.Number, numberHandling, isIeeeFloatingPoint: true);
    }
}