using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


using Axion.Collections.Concurrent;


using ServerCore; using ServerBase;


using SESSION_ID = System.Int32;
using META_ID = System.UInt32;
using ENTITY_GUID = System.String;
using ACCOUNT_ID = System.String;
using OWNER_GUID = System.String;
using USER_GUID = System.String;
using CHARACTER_GUID = System.String;
using ITEM_GUID = System.String;


namespace ServerCommon
{
    public abstract class SlotsBase
    {
        private AtomicInt32 m_slot_max_count = new(0);

        public virtual bool onInitSlots(int slotMaxCount)
        {
            m_slot_max_count.set(slotMaxCount);
            return true;
        }

        public abstract UInt32 onGetCurrSlotCount();

        public UInt32 getSlotMaxCount()
        {
            return (UInt32)m_slot_max_count.Value;
        }

        public virtual string toBasicString()
        {
            return $"{this.getTypeName()}, UsingSlotCount:{onGetCurrSlotCount()}, SlotMaxCount:{m_slot_max_count.Value}";
        }
    }

    public class Slots<TSlotType> : SlotsBase, ISlotsWithType<TSlotType>
        where TSlotType : Enum
    {
        private ConcurrentHashSet<TSlotType> m_slots = new();

        public Slots()
        { }

        public override bool onInitSlots(int slotMaxCount)
        {
            m_slots = new ConcurrentHashSet<TSlotType>(MultiThreadHelper.getThreadOptimalCount(), (int)slotMaxCount);
            return true;
        }

        public virtual ServerErrorCode onIsEquipable(TSlotType targetSlot)
        {
            return (false == m_slots.Contains(targetSlot)) ? ServerErrorCode.Success : ServerErrorCode.SlotsAlreadyEquiped;
        }

        public virtual ServerErrorCode onTryEquip(TSlotType targetSlot)
        {
            return (true == m_slots.TryAdd(targetSlot, out _)) ? ServerErrorCode.Success : ServerErrorCode.SlotsAlreadyEquiped;
        }

        public virtual ServerErrorCode onIsUnequipable(TSlotType targetSlot)
        {
            return (true == m_slots.Contains(targetSlot)) ? ServerErrorCode.Success : ServerErrorCode.SlotsAlreadyUnequiped;
        }

        public virtual ServerErrorCode onTryUnequip(TSlotType targetSlot)
        {
            return (true == m_slots.TryRemove(targetSlot, out _)) ? ServerErrorCode.Success : ServerErrorCode.SlotsAlreadyUnequiped;
        }

        public virtual ServerErrorCode onTryEquipWithEntityBase(TSlotType targetSlot, EntityBase entityBase) => ServerErrorCode.FunctionNotImplemented;

        public virtual ServerErrorCode onTryUnequipWithEntityBase(TSlotType targetSlot, out EntityBase? entityBase)
        {
            entityBase = null;
            return ServerErrorCode.FunctionNotImplemented;
        }

        public virtual EntityBase? onFindEntityBase(TSlotType targetSlot)
        {
            return null;
        }

        public bool isExistSlotType(TSlotType slotType)
        {
            return true == m_slots.Contains(slotType);
        }

        public override UInt32 onGetCurrSlotCount()
        {
            return (UInt32)m_slots.Count;
        }

        public List<EntityBase> getEntityBases()
        {
            return new List<EntityBase>();
        }

        public ICollection getSlots() => m_slots;
    }

    public class SlotsWithEntityBase<TSlotType> : SlotsBase, ISlotsWithType<TSlotType>
        where TSlotType : notnull
    {
        private ConcurrentDictionary<TSlotType, EntityBase> m_slots = new();

        public SlotsWithEntityBase()
        {
        }

        public override bool onInitSlots(int slotMaxCount)
        {
            m_slots = new ConcurrentDictionary<TSlotType, EntityBase>(MultiThreadHelper.getThreadOptimalCount(), (int)slotMaxCount);
            return true;
        }

        public virtual ServerErrorCode onIsEquipable(TSlotType targetSlot)
        {
            return (false == m_slots.ContainsKey(targetSlot)) ? ServerErrorCode.Success : ServerErrorCode.SlotsAlreadyEquiped;
        }

        public virtual ServerErrorCode onTryEquipWithEntityBase(TSlotType targetSlot, EntityBase entityBase)
        {
            return (true == m_slots.TryAdd(targetSlot, entityBase)) ? ServerErrorCode.Success : ServerErrorCode.SlotsAlreadyEquiped;
        }

        public virtual ServerErrorCode onIsUnequipable(TSlotType targetSlot)
        {
            return (true == m_slots.ContainsKey(targetSlot)) ? ServerErrorCode.Success : ServerErrorCode.SlotsAlreadyUnequiped;
        }

        public virtual ServerErrorCode onTryUnequipWithEntityBase(TSlotType targetSlot, out EntityBase? removedEntityBase)
        {
            removedEntityBase = null;
            if (false == m_slots.TryRemove(targetSlot, out var removed_entity_base))
            {
                return ServerErrorCode.SlotsAlreadyUnequiped;
            }
            removedEntityBase = removed_entity_base;

            return ServerErrorCode.Success;
        }

        public virtual EntityBase? onFindEntityBase(TSlotType targetSlot)
        {
            return findEntityBaseInSlotType(targetSlot);
        }

        public EntityBase? findEntityBaseInSlotType(TSlotType targetSlot)
        {
            if(false == m_slots.TryGetValue(targetSlot, out var found_entity_base))
            {
                return null;
            }
            return found_entity_base;
        }

        public EntityBase? findEntityBaseBy(Func<EntityBase, bool> isFound)
        {
            foreach(var each in m_slots)
            {
                var is_success = isFound(each.Value);
                if(true == is_success)
                {
                    return each.Value;
                }
            }

            return null;
        }

        public bool isExistSlotType(TSlotType slotType)
        {
            return true == m_slots.ContainsKey(slotType);
        }

        public override UInt32 onGetCurrSlotCount()
        {
            return (UInt32)m_slots.Count;
        }

        public List<EntityBase> getEntityBases()
        {
            return m_slots.Values.ToList();
        }

        public ICollection getSlots() => m_slots;

        public virtual ServerErrorCode onTryEquip(TSlotType targetSlot) => ServerErrorCode.FunctionNotImplemented;

        public virtual ServerErrorCode onTryUnequip(TSlotType targetSlot) => ServerErrorCode.FunctionNotImplemented;
    }
}