using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using UnityEngine.Events;

public class NPCBrain : MonoBehaviour
{
    [Header("Decision Profile")]
    [SerializeField] private NPCDecisionProfile decisionProfile;

    NPCDecisionPriority currentlyExecutingDecision;
    bool isDead;
    BaseAbility currentlyQueuedAbility;
    bool isCasting;

    NavMeshAgent agent;
    public NavMeshAgent Agent => agent;


    public UnityEvent OnDecisionFinishedExecuting = new UnityEvent();

    private void Awake()
    {
        isDead = false;
        isCasting = false;
    }

    private void Start()
    {
        StartCoroutine(Decide());
    }

    IEnumerator Decide()
    {
        decisionProfile.decisions.Sort((decisionA, decisionB) => decisionB.priority.CompareTo(decisionA.priority));

        foreach (NPCDecisionPriority decisionPriority in decisionProfile.decisions)
        {
            yield return null;

            if (currentlyExecutingDecision != null)
                if (currentlyExecutingDecision.priority >= decisionPriority.priority) continue;

            if (!decisionPriority.decision.IsPossibleToExecute(this)) continue;

            currentlyExecutingDecision = decisionPriority;
            StartCoroutine(TakeAction(currentlyExecutingDecision));
        }
    }

    IEnumerator TakeAction(NPCDecisionPriority decisionPriority)
    {
        decisionPriority.decision.Execute(this);

        yield return new WaitUntil(() => decisionPriority.decision.IsRunning());

        OnDecisionFinishedExecuting.Invoke();
    }

    public bool IsCasting()
    {
        return currentlyQueuedAbility != null ? !currentlyQueuedAbility.castableWhileMoving : isCasting;
    }

    public bool IsDead()
    {
        return isDead;
    }
}


// idle
// patrol
// pursuit
// recall
// attack
// block