using System;
using System.Collections.Generic;
using UnityEngine;
using Unity.Mathematics;
using static Unity.Mathematics.math;

[Serializable]
public abstract class Nucleus {
    public string name; 
    
    //[Obsolete]
    public ClusterPrefab cluster { get; set; }
    public Cluster parent { get; set; }

    protected float3 _outputValue;
    public virtual Vector3 outputValue {
        get { return _outputValue; }
        set {
            //this.stale = 0;
            _outputValue = value;
            if (this.isFiring)
                WhenFiring?.Invoke();
        }
    }
    public bool isFiring => length(_outputValue) > 0.5f;
    public Action WhenFiring;

    public virtual bool isSleeping => lengthsq(this.outputValue) == 0;
    [NonSerialized]
    public int stale = 1000;
    public readonly int staleValueForSleep = 20;
    public bool trace = false;

    public abstract Nucleus ShallowCloneTo(Cluster parent);
    public abstract Nucleus Clone(ClusterPrefab prefab);

    public enum Type {
        None,
        Neuron,
        MemoryCell,
        Selector,
        Cluster,
        Pulsar
    }

    #region Synapses

    public Vector3 bias = Vector3.zero;
    
    [SerializeField]
    private List<Synapse> _synapses = new();
    public List<Synapse> synapses => _synapses;

    public Synapse AddSynapse(Nucleus sendingNucleus, float weight = 1.0f) {
        Synapse synapse = new(sendingNucleus, weight);
        this.synapses.Add(synapse);
        return synapse;
    }

    public Synapse GetSynapse(Nucleus sender) {
        foreach (Synapse synapse in this.synapses)
            if (synapse.nucleus == sender)
                return synapse;
        return null;
    }

    #endregion Synapses

    #region Receivers

    [SerializeReference]
    private List<Nucleus> _receivers = new();
    public List<Nucleus> receivers {
        get { return _receivers; }
        set { _receivers = value; }
    }

    public virtual void AddReceiver(Nucleus receivingNucleus, float weight = 1) {
        this._receivers.Add(receivingNucleus);
        receivingNucleus.AddSynapse(this, weight);
    }

    public void RemoveReceiver(Nucleus receiverNucleus) {
        this._receivers.RemoveAll(receiver => receiver == receiverNucleus);
        receiverNucleus.synapses.RemoveAll(synapse => synapse.nucleus == this);
    }


    #endregion Receivers

    [SerializeReference]
    private NucleusArray _array;
    public NucleusArray array {
        get { return _array; }
        set { _array = value; }
    }

    #region Update

    public abstract void UpdateStateIsolated();

    public virtual void UpdateNuclei() {
        if (this.array == null || this.array.nuclei == null || this.array.nuclei.Length <= 1)
            return;

        this.stale++;
        if (this.stale > staleValueForSleep) {
            //Debug.Log($"{this.name} goes to sleep, stale = {this.stale}");
            _outputValue = Vector3.zero;
        }
    }

    public void ProcessStimulus(int thingId, Vector3 inputValue, string thingName = null) {
        this.array.ProcessStimulus(thingId, inputValue, thingName);
    }

    #endregion Update

}