source: binary-improvements/MapRendering/API/GetPlayerInventory.cs

using System.Collections.Generic;
using System.Net;
using AllocsFixes.PersistentData;
using JetBrains.Annotations;
using Utf8Json;
using Webserver;
using Webserver.WebAPI;

namespace AllocsFixes.WebAPIs {
        [UsedImplicitly]
        public class GetPlayerInventory : AbsWebAPI {
                public override void HandleRequest (RequestContext _context) {
                        if (_context.Request.QueryString ["userid"] == null) {
                                WebUtils.WriteText (_context.Response, "No user id given", HttpStatusCode.BadRequest);
                                return;
                        }

                        string userIdString = _context.Request.QueryString ["userid"];
                        if (!PlatformUserIdentifierAbs.TryFromCombinedString (userIdString, out PlatformUserIdentifierAbs userId)) {
                                WebUtils.WriteText (_context.Response, "Invalid user id given", HttpStatusCode.BadRequest);
                                return;
                        }

                        Player p = PersistentContainer.Instance.Players.GetByUserId (userId);
                        if (p == null) {
                                WebUtils.WriteText (_context.Response, "Unknown user id given", HttpStatusCode.NotFound);
                                return;
                        }

                        GetInventoryArguments (_context, out bool showIconColor, out bool showIconName);

                        JsonWriter writer = new JsonWriter ();
                        DoPlayer (ref writer, p, showIconColor, showIconName);
                        WebUtils.WriteJsonData (_context.Response, ref writer);
                }

                internal static void GetInventoryArguments (RequestContext _context, out bool _showIconColor, out bool _showIconName) {
                        if (_context.Request.QueryString ["showiconcolor"] == null || !bool.TryParse (_context.Request.QueryString ["showiconcolor"], out _showIconColor)) {
                                _showIconColor = true;
                        }
                        
                        if (_context.Request.QueryString ["showiconname"] == null || !bool.TryParse (_context.Request.QueryString ["showiconname"], out _showIconName)) {
                                _showIconName = true;
                        }
                }

                private static readonly byte[] jsonKeyUserId = JsonWriter.GetEncodedPropertyNameWithBeginObject ("userid");
                private static readonly byte[] jsonKeyCrossPlatformId = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("crossplatformid");
                private static readonly byte[] jsonKeyEntityId = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("entityid");
                private static readonly byte[] jsonKeyPlayerName = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("playername");
                private static readonly byte[] jsonKeyBag = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("bag");
                private static readonly byte[] jsonKeyBelt = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("belt");
                private static readonly byte[] jsonKeyEquipment = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("equipment");

                internal static void DoPlayer (ref JsonWriter _writer, Player _player, bool _showIconColor, bool _showIconName) {
                        PersistentData.Inventory inv = _player.Inventory;
                        
                        _writer.WriteRaw (jsonKeyUserId);
                        _writer.WriteString (_player.PlatformId.CombinedString);
                        
                        _writer.WriteRaw (jsonKeyCrossPlatformId);
                        _writer.WriteString (_player.CrossPlatformId?.CombinedString ?? "");
                        
                        _writer.WriteRaw (jsonKeyEntityId);
                        _writer.WriteInt32 (_player.EntityID);
                        
                        _writer.WriteRaw (jsonKeyPlayerName);
                        _writer.WriteString (_player.Name);
                        
                        _writer.WriteRaw (jsonKeyBag);
                        DoInventory (ref _writer, inv.bag, _showIconColor, _showIconName);
                        
                        _writer.WriteRaw (jsonKeyBelt);
                        DoInventory (ref _writer, inv.belt, _showIconColor, _showIconName);
                        
                        _writer.WriteRaw (jsonKeyEquipment);
                        DoEquipment (ref _writer, inv.equipment, _showIconColor, _showIconName);
                        
                        _writer.WriteEndObject ();
                }

                private static void DoInventory (ref JsonWriter _writer, IReadOnlyList<InvItem> _inv, bool _showIconColor, bool _showIconName) {
                        _writer.WriteBeginArray ();
                        for (int i = 0; i < _inv.Count; i++) {
                                if (i > 0) {
                                        _writer.WriteValueSeparator ();
                                }
                                GetJsonForItem (ref _writer, _inv [i], _showIconColor, _showIconName);
                        }
                        _writer.WriteEndArray ();
                }

                private static void DoEquipment (ref JsonWriter _writer, IReadOnlyList<InvItem> _equ, bool _showIconColor, bool _showIconName) {
                        _writer.WriteBeginObject ();
                        
                        AddEquipment (ref _writer, "head", _equ, EquipmentSlots.Head, _showIconColor, _showIconName);
                        _writer.WriteValueSeparator ();

                        AddEquipment (ref _writer, "armor", _equ, EquipmentSlots.Chest, _showIconColor, _showIconName);
                        _writer.WriteValueSeparator ();

                        AddEquipment (ref _writer, "boots", _equ, EquipmentSlots.Feet, _showIconColor, _showIconName);
                        _writer.WriteValueSeparator ();

                        AddEquipment (ref _writer, "gloves", _equ, EquipmentSlots.Hands, _showIconColor, _showIconName);
                        
                        _writer.WriteEndObject ();
                }

                private static void AddEquipment (ref JsonWriter _writer, string _slotname, IReadOnlyList<InvItem> _items, EquipmentSlots _slot, bool _showIconColor, bool _showIconName) {
                        _writer.WritePropertyName (_slotname);

                        int slotindex = (int)_slot;

                        if (_items == null || _items[slotindex] == null) {
                                // Slot not found / empty
                                _writer.WriteNull ();
                                return;
                        }
                        
                        InvItem item = _items [slotindex];
                        GetJsonForItem (ref _writer, item, _showIconColor, _showIconName);
                }

                private static readonly byte[] jsonKeyCount = JsonWriter.GetEncodedPropertyNameWithBeginObject ("count");
                private static readonly byte[] jsonKeyName = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("name");
                private static readonly byte[] jsonKeyIcon = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("icon");
                private static readonly byte[] jsonKeyIconColor = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("iconcolor");
                private static readonly byte[] jsonKeyQuality = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("quality");
                private static readonly byte[] jsonKeyQualityColor = JsonWriter.GetEncodedPropertyNameWithPrefixValueSeparator ("qualitycolor");

                private static void GetJsonForItem (ref JsonWriter _writer, InvItem _item, bool _showIconColor, bool _showIconName) {
                        if (_item == null) {
                                _writer.WriteNull ();
                                return;
                        }
                        
                        _writer.WriteRaw (jsonKeyCount);
                        _writer.WriteInt32 (_item.count);
                        
                        _writer.WriteRaw (jsonKeyName);
                        _writer.WriteString (_item.itemName);
                        
                        if (_showIconName) {
                                _writer.WriteRaw (jsonKeyIcon);
                                _writer.WriteString (_item.icon);
                        }

                        if (_showIconColor) {
                                _writer.WriteRaw (jsonKeyIconColor);
                                _writer.WriteString (_item.iconcolor);
                        }

                        _writer.WriteRaw (jsonKeyQuality);
                        _writer.WriteInt32 (_item.quality);

                        if (_item.quality >= 0) {
                                _writer.WriteRaw (jsonKeyQualityColor);
                                _writer.WriteString (QualityInfo.GetQualityColorHex (_item.quality));
                        }
                        
                        _writer.WriteEndObject ();
                }
        }
}