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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text.Json;
using System.Text.Json.Serialization;
using MonoGame.Extended.Collections;
using MonoGame.Extended.Gui.Controls;
namespace MonoGame.Extended.Gui.Serialization
{
public class ControlStyleJsonConverter : JsonConverter<ControlStyle>
{
private readonly Dictionary<string, Type> _controlTypes;
private const string _typeProperty = "Type";
private const string _nameProperty = "Name";
public ControlStyleJsonConverter(params Type[] customControlTypes)
{
_controlTypes = typeof(Control)
.GetTypeInfo()
.Assembly
.ExportedTypes
.Concat(customControlTypes)
.Where(t => t.GetTypeInfo().IsSubclassOf(typeof(Control)))
.ToDictionary(t => t.Name);
}
/// <inheritdoc />
public override bool CanConvert(Type typeToConvert) => typeToConvert == typeof(ControlStyle);
/// <inheritdoc />
public override ControlStyle Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
var dictionary = JsonSerializer.Deserialize<Dictionary<string, object>>(ref reader, options);
var name = dictionary.GetValueOrDefault(_nameProperty) as string;
var typeName = dictionary.GetValueOrDefault(_typeProperty) as string;
if (!_controlTypes.TryGetValue(typeName, out Type controlType))
throw new FormatException("invalid control type: " + typeName);
var targetType = typeName != null ? controlType : typeof(Control);
var properties = targetType
.GetRuntimeProperties()
.ToDictionary(p => p.Name);
var style = new ControlStyle(name, targetType);
foreach (var keyValuePair in dictionary.Where(i => i.Key != _typeProperty))
{
var propertyName = keyValuePair.Key;
var rawValue = keyValuePair.Value;
PropertyInfo propertyInfo;
var value = properties.TryGetValue(propertyName, out propertyInfo)
? DeserializeValueAs(rawValue, propertyInfo.PropertyType)
: DeserializeValueAs(rawValue, typeof(object));
style.Add(propertyName, value);
}
return style;
}
private static object DeserializeValueAs(object value, Type type)
{
var json = JsonSerializer.Serialize(value, type);
return JsonSerializer.Deserialize(json, type);
}
/// <inheritdoc />
public override void Write(Utf8JsonWriter writer, ControlStyle value, JsonSerializerOptions options)
{
var style = (ControlStyle)value;
var dictionary = new Dictionary<string, object> { [_typeProperty] = style.TargetType.Name };
foreach (var keyValuePair in style)
dictionary.Add(keyValuePair.Key, keyValuePair.Value);
JsonSerializer.Serialize(writer, dictionary);
}
}
}
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