using System;
using MiNET;
using MiNET.Net;
using MiNET.Items;
using MiNET.Utils;
using fNbt;
using log4net;
namespace xCore
{
    public class HashedItemSigner : ItemSigner
    {
        public static string SessionTagKey { get; set; } = string.Empty;
        //public static int SessionKey = 0;
        private static readonly ILog Log = LogManager.GetLogger(typeof(HashedItemSigner));
        private static bool _signItems = true;
        public override Item SignItem(Item item)
        {

            //if (SessionKey == 0) xCoreGames.rnd.Next(0, 100000);
            if(string.IsNullOrEmpty(SessionTagKey))
            {
                var m = xCoreGames.rnd.Next(10, 20);
                for (var i = 0; i < m; i++)
                    SessionTagKey += (char)xCoreGames.rnd.Next(0, 40);
            }
            //if (!_signItems) return item;
            if (item.ExtraData == null) item.ExtraData = new NbtCompound();
            //item.ExtraData["Hash"] = new NbtInt("Hash", 911);
            {
                if (!item.ExtraData.Contains(SessionTagKey)) {
                    //lock(item.ExtraData)
                    //{

                    var vTag = new NbtCompound(SessionTagKey);
                    foreach (var t in item.ExtraData)
                        vTag.Add((NbtTag)t.Clone());

                    var itemDat = new NbtCompound("ItemData");
                    itemDat.Add(new NbtInt("Id", item.Id));
                    itemDat.Add(new NbtShort("Metadata", item.Metadata));
                    //itemDat.Add(new NbtByte("Count", item.Count));
                    vTag.Add(itemDat);

                    item.ExtraData.Add(vTag);
                    //}
                    //item.ExtraData["Hash"] = new NbtInt(911);
                }
            }
            return item;
        }

        public override bool VerifyItemStack(Player player, Item itemStack)
        {
            //if (!_signItems) return true;
            if (itemStack.Id == 0 && itemStack.Count == 0 && itemStack.Metadata == 0) return true;
            if (itemStack.ExtraData == null)
            {
                Log.Error($"{player.Username} Missing ExtraData on item with ID: {itemStack.Id}, Meta: {itemStack.Metadata}, Count: {itemStack.Count}");
                return false;
            }
            //if (!itemStack.ExtraData.Contains(SessionTagKey))
            //{
            //  Log.Error($"{player.Username} Missing hash for ExtraData on item with ID: {itemStack.Id}, Meta: {itemStack.Metadata}, Count: {itemStack.Count}");
            //  return false;
            //}
            //if (tag.IntValue != SessionKey)
            //{
            //  Log.Error($"{player.Username} Invalid hash for ExtraData on item with ID: {itemStack.Id}, Meta: {itemStack.Metadata}, Count: {itemStack.Count} NBT: {itemStack.ExtraData}");
            //  return false;
            //}
            NbtCompound signTag = null;
            if (!itemStack.ExtraData.TryGet(SessionTagKey, out signTag))
            {
                Log.Error($"{player.Username} Missing hash for ExtraData on item with ID: {itemStack.Id}, Meta: {itemStack.Metadata}, Count: {itemStack.Count}");
                return false;
            }

            NbtCompound itemDatTag = null;
            if (signTag.TryGet("ItemData", out itemDatTag))
            {
                NbtInt idTag = null;
                NbtShort metadataTag = null;
                NbtByte countTag = null;
                if(itemDatTag.TryGet("Id", out idTag) && itemDatTag.TryGet("Metadata", out metadataTag) /*&& itemDatTag.TryGet("Count", out countTag)*/)
                {
                    if(idTag.IntValue != itemStack.Id || metadataTag.ShortValue != itemStack.Metadata /*|| countTag.ByteValue != itemStack.Count*/)
                    {
                        return false;//id, metadata или count не совпадают с подписью
                    }
                }
                else
                {
                    return false;//отсутствует информация об id, metadata и count
                }
            }
            else
            {
                return false;//отсутствует информация об id, metadata и count
            }

            foreach(var extradataTag in itemStack.ExtraData)
            {
                if (extradataTag.Name == SessionTagKey) continue;
                NbtTag outTag = null;
                if (signTag.TryGet(extradataTag.Name, out outTag))
                {
                    if (extradataTag != outTag)
                    {
                        return false;//неверный тег extradataTag.Name
                    }
                }
                else
                {
                    return false;//в SignData отсутствует тег extradataTag.Name
                }
            }

            foreach (var sigTag in itemStack.ExtraData)
            {
                if (sigTag.Name == "ItemData") continue;
                NbtTag outTag = null;
                if (!itemStack.ExtraData.TryGet(sigTag.Name, out outTag))
                {
                    return false;//в ExtraData отсутствует тег extradataTag.Name
                }
        }

            return true;
        }
    }

    public static class ItemSignerConfig
    {
        public static void AddTag(this Item item, NbtTag tag)
        {
            if (item.ExtraData == null) return;//Hacks...
            NbtCompound signTag = null;
            if (!item.ExtraData.TryGet(HashedItemSigner.SessionTagKey, out signTag)) return;//hacks...
            signTag.Add((NbtTag)tag.Clone());
            item.ExtraData.Add((NbtTag)tag.Clone());
        }

        public static void RemoveTag(this Item item, string tagName)
        {
            if (item.ExtraData == null) return;//Hacks...
            NbtCompound signTag = null;
            if (!item.ExtraData.TryGet(HashedItemSigner.SessionTagKey, out signTag)) return;//hacks...
            NbtTag tag = null;
            if (signTag.TryGet(tagName, out tag))
                signTag.Remove(tag);
            if (item.ExtraData.TryGet(tagName, out tag))
                item.ExtraData.Remove(tag);
        }
    }
}