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


using AsyncStateMachine;


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 ServerBase;


public abstract partial class EntityHFSMBase : HFSMBase<EntityStateTriggerType, EntityStateType>, IWithEntityOwner
{
    private readonly EntityBase m_owner;

    public EntityHFSMBase(EntityBase owner)
        : base()
    {
        m_owner = owner;
    }


    public async Task<Result> loadHfsm()
    {
        var result = new Result();
        var err_msg = string.Empty;

        if (false == await initHfsm(EntityStateType.Created, setupHfsm))
        {
            err_msg = $"\"Failed to create Entity HFSM !!!";
            result.setFail(ServerErrorCode.EntityBaseHfsmInitFailed, err_msg);
            return result;
        }

        return result;
    }

    protected abstract bool setupHfsm(HFSMBase<EntityStateTriggerType, EntityStateType> initHFSM);

    public override void onSubscribeStateChangeNotify()
    {
        var sm = getStateMachine();
        NullReferenceCheckHelper.throwIfNull(sm, () => $"sm is null !!!");

        sm.Observable.Subscribe(onTransitionedState);
    }

    protected virtual void onTransitionedState(AsyncStateMachine.Transition<EntityStateTriggerType, EntityStateType> transition)
    {
        if (false == transition.isChangedState())
        {
            return;
        }

        var owner = getOwner();

        var debug_msg = $"EntityHFSM transited State !!! : {transition.toBasicString()} - {owner.toBasicString()}";
        Log.getLogger().debug(debug_msg);
    }
}