source: TFP-WebServer/WebServer/src/WebAPI/JsonCommons.cs@ 440

using System;
using System.Collections.Generic;
using System.Globalization;
using UnityEngine;
using Utf8Json;

namespace Webserver.WebAPI {
        public static class JsonCommons {
                private static readonly byte[] jsonKeyPositionX = JsonWriter.GetEncodedPropertyNameWithBeginObject ("x");
                private static readonly byte[] jsonKeyPositionY = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("y");
                private static readonly byte[] jsonKeyPositionZ = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("z");

                public static void WritePositionObject (ref JsonWriter _writer, Vector3i _position) {
                        _writer.WriteRaw (jsonKeyPositionX);
                        _writer.WriteInt32 (_position.x);
                        
                        _writer.WriteRaw (jsonKeyPositionY);
                        _writer.WriteInt32 (_position.y);
                        
                        _writer.WriteRaw (jsonKeyPositionZ);
                        _writer.WriteInt32 (_position.z);
                        
                        _writer.WriteEndObject ();
                }

                public static void WritePositionObject (ref JsonWriter _writer, Vector3 _position) {
                        _writer.WriteRaw (jsonKeyPositionX);
                        _writer.WriteSingle (_position.x);
                        
                        _writer.WriteRaw (jsonKeyPositionY);
                        _writer.WriteSingle (_position.y);
                        
                        _writer.WriteRaw (jsonKeyPositionZ);
                        _writer.WriteSingle (_position.z);
                        
                        _writer.WriteEndObject ();
                }

                private static readonly byte[] jsonKeyDays = JsonWriter.GetEncodedPropertyNameWithBeginObject ("days");
                private static readonly byte[] jsonKeyHours = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("hours");
                private static readonly byte[] jsonKeyMinutes = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("minutes");

                public static void WriteGameTimeObject (ref JsonWriter _writer, int _days, int _hours, int _minutes) {
                        _writer.WriteRaw (jsonKeyDays);
                        _writer.WriteInt32 (_days);
                        
                        _writer.WriteRaw (jsonKeyHours);
                        _writer.WriteInt32 (_hours);
                        
                        _writer.WriteRaw (jsonKeyMinutes);
                        _writer.WriteInt32 (_minutes);
                        
                        _writer.WriteEndObject ();
                }

                private static readonly byte[] jsonKeyCombinedString = JsonWriter.GetEncodedPropertyNameWithBeginObject ("combinedString");
                private static readonly byte[] jsonKeyPlatformId = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("platformId");
                private static readonly byte[] jsonKeyUserId = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("userId");

                public static void WritePlatformUserIdentifier (ref JsonWriter _writer, PlatformUserIdentifierAbs _userIdentifier) {
                        if (_userIdentifier == null) {
                                _writer.WriteNull ();
                                return;
                        }
                        
                        _writer.WriteRaw (jsonKeyCombinedString);
                        _writer.WriteString (_userIdentifier.CombinedString);
                        
                        _writer.WriteRaw (jsonKeyPlatformId);
                        _writer.WriteString (_userIdentifier.PlatformIdentifierString);
                        
                        _writer.WriteRaw (jsonKeyUserId);
                        _writer.WriteString (_userIdentifier.ReadablePlatformUserIdentifier);
                        
                        _writer.WriteEndObject ();
                }

                public static bool TryReadPlatformUserIdentifier (IDictionary<string, object> _jsonInput, out PlatformUserIdentifierAbs _userIdentifier) {
                        if (TryGetJsonField (_jsonInput, "combinedString", out string combinedString)) {
                                _userIdentifier = PlatformUserIdentifierAbs.FromCombinedString (combinedString, false);
                                if (_userIdentifier != null) {
                                        return true;
                                }
                        }
                        
                        if (!TryGetJsonField (_jsonInput, "platformId", out string platformId)) {
                                _userIdentifier = default;
                                return false;
                        }

                        if (!TryGetJsonField (_jsonInput, "userId", out string userId)) {
                                _userIdentifier = default;
                                return false;
                        }

                        _userIdentifier = PlatformUserIdentifierAbs.FromPlatformAndId (platformId, userId, false);
                        return _userIdentifier != null;
                }

                public static void WriteDateTime (ref JsonWriter _writer, DateTime _dateTime) {
                        _writer.WriteString (_dateTime.ToString ("o"));
                }

                public static bool TryReadDateTime (IDictionary<string, object> _jsonInput, string _fieldName, out DateTime _result) {
                        _result = default;
                        
                        if (!TryGetJsonField (_jsonInput, _fieldName, out string dateTimeString)) {
                                return false;
                        }

                        return DateTime.TryParse (dateTimeString, null, DateTimeStyles.RoundtripKind, out _result);
                }


                public static bool TryGetJsonField (IDictionary<string, object> _jsonObject, string _fieldName, out int _value) {
                        _value = default;
                        
                        if (!_jsonObject.TryGetValue (_fieldName, out object fieldNode)) {
                                return false;
                        }

                        if (fieldNode is not double value) {
                                return false;
                        }

                        try {
                                _value = (int)value;
                                return true;
                        } catch (Exception) {
                                return false;
                        }
                }

                public static bool TryGetJsonField (IDictionary<string, object> _jsonObject, string _fieldName, out double _value) {
                        _value = default;
                        
                        if (!_jsonObject.TryGetValue (_fieldName, out object fieldNode)) {
                                return false;
                        }

                        if (fieldNode is not double value) {
                                return false;
                        }

                        try {
                                _value = value;
                                return true;
                        } catch (Exception) {
                                return false;
                        }
                }

                public static bool TryGetJsonField (IDictionary<string, object> _jsonObject, string _fieldName, out string _value) {
                        _value = default;
                        
                        if (!_jsonObject.TryGetValue (_fieldName, out object fieldNode)) {
                                return false;
                        }

                        if (fieldNode is not string value) {
                                return false;
                        }

                        try {
                                _value = value;
                                return true;
                        } catch (Exception) {
                                return false;
                        }
                }

                public static bool TryGetJsonField (IDictionary<string, object> _jsonObject, string _fieldName,
                        out IDictionary<string, object> _value) {
                        _value = default;
                        
                        if (!_jsonObject.TryGetValue (_fieldName, out object fieldNode)) {
                                return false;
                        }

                        if (fieldNode is not IDictionary<string, object> value) {
                                return false;
                        }

                        try {
                                _value = value;
                                return true;
                        } catch (Exception) {
                                return false;
                        }
                }
        }
}