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using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
namespace Tango.Telemetry
{
internal static class JsonFlattener
{
public static string FlattenObjectToFlatJson(object obj, Formatting format)
{
var flat = new JObject();
FlattenRecursive(obj, flat, prefix: null);
return flat.ToString(format);
}
private static void FlattenRecursive(object obj, JObject target, string prefix)
{
if (obj == null)
return;
var type = obj.GetType();
if (type == typeof(JObject))
{
foreach (var prop in ((JObject)obj).Properties())
{
FlattenRecursive(prop.Value, target, Combine(prefix, prop.Name));
}
return;
}
if (obj is JValue jVal)
{
target[Combine(prefix, "Value")] = JToken.FromObject(jVal.Value);
return;
}
if (obj is JToken jToken && jToken.Type == JTokenType.Object)
{
foreach (var prop in ((JObject)jToken).Properties())
{
FlattenRecursive(prop.Value, target, Combine(prefix, prop.Name));
}
return;
}
foreach (var prop in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
if (!prop.CanRead) continue;
var value = prop.GetValue(obj);
if (value == null) continue;
var valueType = value.GetType();
if (IsSimpleType(valueType))
{
target[Combine(prefix, prop.Name)] = JToken.FromObject(value);
}
else if (value is IEnumerable enumerable && !(value is string))
{
int index = 0;
foreach (var item in enumerable)
{
FlattenRecursive(item, target, Combine(prefix, $"{prop.Name}_{index}"));
index++;
}
}
else
{
FlattenRecursive(value, target, Combine(prefix, prop.Name));
}
}
}
private static string Combine(string prefix, string name)
{
return string.IsNullOrEmpty(prefix) ? name : $"{prefix}_{name}";
}
private static bool IsSimpleType(Type type)
{
return type.IsPrimitive || type.IsValueType || type == typeof(string);
}
}
}
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