using BrewMonster.Network;
using BrewMonster.Scripts;
using CSNetwork.GPDataType;
using System.Collections.Generic;
using static BrewMonster.Scripts.EC_Inventory;

namespace BrewMonster
{
    public partial class CECHostPlayer
    {
        /// <summary>
        /// C++ CECHostPlayer::SortPack — reorder pack via MULTI_EXCHANGE_ITEM (DlgInventory OnCommand_arrange).
        /// </summary>
        public void SortPack(int iPack)
        {
            EC_Inventory pInventory = GetPack(iPack);
            if (pInventory == null)
                return;

            int nIvtrSize = pInventory.GetSize();
            if (nIvtrSize <= 0)
                return;

            if (pInventory.GetEmptySlotNum() == nIvtrSize)
                return;

            for (int i = 0; i < nIvtrSize; i++)
            {
                var pItem = pInventory.GetItem(i, false);
                if (pItem != null && pItem.IsFrozen())
                    return;
            }

            for (int i = 0; i < nIvtrSize; i++)
            {
                var pItem = pInventory.GetItem(i, false);
                pItem?.Freeze(true);
            }

            try
            {
                var vecItem = new List<int>(nIvtrSize);
                for (int i = 0; i < nIvtrSize; i++)
                    vecItem.Add(i);

                vecItem.Sort((a, b) => ComparePackSortIndices(pInventory, a, b));

                var vecExchange = new List<int>();
                int pos = 0;
                while (pos < nIvtrSize)
                {
                    int j = vecItem[pos];
                    if (j == pos)
                    {
                        pos++;
                        continue;
                    }

                    int k = vecItem[j];
                    if (pInventory.GetItem(j, false) != null || pInventory.GetItem(k, false) != null)
                    {
                        vecExchange.Add(pos);
                        vecExchange.Add(j);
                    }

                    int tmp = vecItem[pos];
                    vecItem[pos] = vecItem[j];
                    vecItem[j] = tmp;
                }

                if (vecExchange.Count > 0)
                {
                    int pairCount = vecExchange.Count / 2;
                    for (int i = 0, j = vecExchange.Count - 1; i < j; i++, j--)
                    {
                        int t = vecExchange[i];
                        vecExchange[i] = vecExchange[j];
                        vecExchange[j] = t;
                    }

                    UnityGameSession.RequestMultiExchangeItem((byte)iPack, pairCount, vecExchange.ToArray());
                }
                else
                {
                    var pGameRun = EC_Game.GetGameRun();
                    pGameRun?.AddChatMessage("Không cần sắp xếp kho đồ.", (int)ChatChannel.GP_CHAT_SYSTEM);
                }
            }
            finally
            {
                for (int i = 0; i < nIvtrSize; i++)
                {
                    var pItem = pInventory.GetItem(i, false);
                    pItem?.Freeze(false);
                }
            }
        }

        private static int ComparePackSortIndices(EC_Inventory pInventory, int index1, int index2)
        {
            if (DefaultPackSortLess(pInventory, index1, index2))
                return -1;
            if (DefaultPackSortLess(pInventory, index2, index1))
                return 1;
            return 0;
        }

        /// <summary>Returns true when slot <paramref name="index1"/> should appear before <paramref name="index2"/>.</summary>
        private static bool DefaultPackSortLess(EC_Inventory pInventory, int index1, int index2)
        {
            if (pInventory == null)
                return false;

            EC_IvtrItem pItem1 = pInventory.GetItem(index1, false);
            EC_IvtrItem pItem2 = pInventory.GetItem(index2, false);

            if (pItem1 == null)
                return false;
            if (pItem2 == null)
                return true;

            int cid1 = pItem1.GetClassID();
            int tid1 = pItem1.GetTemplateID();
            int cid2 = pItem2.GetClassID();
            int tid2 = pItem2.GetTemplateID();

            if (cid1 != cid2)
            {
                int cidOrder1 = GetPackSortClassOrder(cid1);
                int cidOrder2 = GetPackSortClassOrder(cid2);
                if (cidOrder1 != cidOrder2)
                    return cidOrder1 > cidOrder2;
                return cid1 < cid2;
            }

            if (cid1 == (int)EC_IvtrItem.InventoryClassId.ICID_WEAPON)
            {
                if (pItem1 is CECIvtrWeapon w1 && pItem2 is CECIvtrWeapon w2)
                {
                    var e1 = w1.GetDBEssence();
                    var e2 = w2.GetDBEssence();
                    if (e1.level != e2.level)
                        return e1.level > e2.level;
                }
            }
            else if (cid1 == (int)EC_IvtrItem.InventoryClassId.ICID_ARMOR)
            {
                if (pItem1 is EC_IvtrArmor a1 && pItem2 is EC_IvtrArmor a2)
                {
                    var e1 = a1.GetDBEssence();
                    var e2 = a2.GetDBEssence();
                    if (e1.level != e2.level)
                        return e1.level > e2.level;
                }
            }
            else if (cid1 == (int)EC_IvtrItem.InventoryClassId.ICID_GENERALCARD)
            {
                if (pItem1 is EC_IvtrGeneralCard c1 && pItem2 is EC_IvtrGeneralCard c2)
                {
                    int t1 = c1.GetEssence().type;
                    int t2 = c2.GetEssence().type;
                    if (t1 != t2)
                        return t1 < t2;
                }
            }

            return tid1 < tid2;
        }

        private static int GetPackSortClassOrder(int cid)
        {
            int[] s_CIDs =
            {
                (int)EC_IvtrItem.InventoryClassId.ICID_WEAPON,
                (int)EC_IvtrItem.InventoryClassId.ICID_ARROW,
                (int)EC_IvtrItem.InventoryClassId.ICID_TOSSMAT,
                (int)EC_IvtrItem.InventoryClassId.ICID_ARMOR,
                (int)EC_IvtrItem.InventoryClassId.ICID_DECORATION,
                (int)EC_IvtrItem.InventoryClassId.ICID_BIBLE,
                (int)EC_IvtrItem.InventoryClassId.ICID_FLYSWORD,
                (int)EC_IvtrItem.InventoryClassId.ICID_WING,
                (int)EC_IvtrItem.InventoryClassId.ICID_GOBLIN,
                (int)EC_IvtrItem.InventoryClassId.ICID_GOBLIN_EQUIP,
                (int)EC_IvtrItem.InventoryClassId.ICID_FASHION,
                (int)EC_IvtrItem.InventoryClassId.ICID_AUTOHP,
                (int)EC_IvtrItem.InventoryClassId.ICID_AUTOMP,
                (int)EC_IvtrItem.InventoryClassId.ICID_MEDICINE,
                (int)EC_IvtrItem.InventoryClassId.ICID_SKILLMATTER,
                (int)EC_IvtrItem.InventoryClassId.ICID_TARGETITEM,
                (int)EC_IvtrItem.InventoryClassId.ICID_STONE,
                (int)EC_IvtrItem.InventoryClassId.ICID_PETEGG,
                (int)EC_IvtrItem.InventoryClassId.ICID_REFINETICKET,
                (int)EC_IvtrItem.InventoryClassId.ICID_DYETICKET,
                (int)EC_IvtrItem.InventoryClassId.ICID_GOBLIN_EXPPILL,
                (int)EC_IvtrItem.InventoryClassId.ICID_GENERALCARD,
                (int)EC_IvtrItem.InventoryClassId.ICID_GENERALCARD_DICE,
            };

            for (int i = 0; i < s_CIDs.Length; i++)
            {
                if (cid == s_CIDs[i])
                    return s_CIDs.Length - i;
            }

            return 0;
        }
    }
}