using System;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.AI;
using UnityEngine.VFX;
using DG.Tweening;

public class NPC : MonoBehaviour
{

    public event Action OnDead;
    public void Dead() => OnDead?.Invoke();

    private void Awake()
    {
		npcAssistant = new NPCAssistant(this);

		entityManager = Client.Instance.gameObject.GetComponent<NPCManager>();

        //projectile origin is normally the RIGHT hand. LEFT hand for troll / NPC's with bows.
        Transform[] children = GetComponentsInChildren<Transform>();
        foreach (Transform transforms in children)
        {
            if (transforms.name == "projectileOrigin")
            {
                projectileOrigin = transforms.gameObject;
            }
            if (transforms.CompareTag("Head"))
            {
                headTransform = transforms;
            }
            if (transforms.TryGetComponent(out SkinnedMeshRenderer skinnedMesh))
            {
                //Debug.LogError($"SkinnedMesh Found: {skinnedMesh.name}");
                this.skinnedMesh = skinnedMesh;
            }

            if (transforms.TryGetComponent(out Collider collider))
            {
                npcColliders.Add(collider);
            }
        }

        weaponRandomizer = GetComponent<NPCWeaponRandomizer>();
        sampleMesh = GetComponent<SkinnedMeshToMesh>();
        healthBarComponent = GetComponent<NPCHealthBar>();

		healthBarComponent.HeadTransform = headTransform;
		
    }

    private void Start()
    {
        if (localPathfinding())
        {
            l = new LocalNPC(this);
            l.Start();
        }
        
        

        animator = GetComponent<Animator>();

        targetPosition = transform.position;
        previousPosition = transform.position;

        lastUpdate = Time.time;
        forcePositionUpdate = false;
    }

    

    

    

    private void Update()
    {
        if (Time.time - lastUpdate > 7.0f)
        {
            entityManager.RemoveNPC(this);
            return;
        }

        //force update position
        if (forcePositionUpdate)
        {
            transform.position = targetPosition;
            forcePositionUpdate = false;
            return;
        }
    }


    private void FixedUpdate()
    {
        if (localPathfinding())
		{
            l.FixedUpdate();
            return;
		}
        
        if (isDead) { return; }

        getNA().InterpolateEntity();
        getNA().BindEntityToTerrain();

        
        showMesh();
    }

    

    

    



    
    
    public void processUpdateMessage(int id, float x, float z, int deltaMultiplier, float face, float normalizedHealth)
    {
        lastUpdate = Time.time;

        if (localPathfinding())
		{
            return;
		}

        if (deltaMultiplier == -1)
            this.forcePositionUpdate = true;
        else
            this.deltaMultiplier = deltaMultiplier;

        targetPosition = new Vector3(x + (getNA().getSize(this.type) / 2.0f), transform.position.y, z + (getNA().getSize(this.type) / 2.0f));
        transform.rotation = Quaternion.Euler(0, face, 0);
        if (healthBarComponent.healthBar != null)
            healthBarComponent.healthBar.SetHealth(normalizedHealth);

        if (normalizedHealth <= 0.0f)
		{
			Destroy(GetComponent<AudioSource>());
			isDead = true;
		}


	}

    public void PlayAnimation(string anim)
    {
        if (anim.ToLower().Equals("death"))
        {
            Destroy(GetComponent<AudioSource>());
			isDead = true;
            getNA().ToggleColliders(false);
            StartCoroutine(getNA().DeathFadePosition());
            StartCoroutine(getNA().WaitToSpawnDeathSoul());
            getNA().FadeHealthCanvas();
            OnDead?.Invoke();
        }

        //print("trying to play animation: " + anim);
        
        animator?.Play(anim);
    }


    public void showMesh()
    {
        if (Time.time - lastDistanceCheck < 3.0f) { return; }
        //if distance to player > 80
        if (Vector3.Distance(transform.position, Client.Instance.mainPlayer.transform.position) > 80)
        {
            skinnedMesh.enabled = false;
        }
        else
        {
            skinnedMesh.enabled = true;
        }
    }
    

    

    public int GetID()
    {
        return id;
    }

    public void SetID(int id)
    {
        this.id = id;
    }

    public void SetHitPoints(int hp)
    {
        hitPoints = hp;
    }
    public int GetHitPoints()
    {
        return hitPoints;
    }

    public NPCAssistant getNA()
    {
        return npcAssistant;
    }
    
    public bool localPathfinding()
	{
        return Misc.checkBit(flags, 0);
	}

    public Projectile Instantiate2(Projectile g)
	{
        return Instantiate(g);
	}

    private int id;//uuid
    public int flags;

    public Vector3 targetPosition;
    public float lastUpdate;
    public bool forcePositionUpdate;
    public int hitPoints;
    private NPCManager entityManager;
    public GameObject projectileOrigin;
    [System.NonSerialized] public Animator animator;
    [System.NonSerialized] public int type;
    //when dead, stop interpolation
    [System.NonSerialized] public bool isDead = false;

    public float damping = 10.0f;
    public Vector3 previousPosition;

    public Transform headTransform;

    public SkinnedMeshRenderer skinnedMesh = null;
    public SkinnedMeshToMesh sampleMesh = null;
    public NPCWeaponRandomizer weaponRandomizer = null;
    public NPCHealthBar healthBarComponent;
    public int deltaMultiplier;
    
    private float lastDistanceCheck = 0.0f;

    public List<Collider> npcColliders = new List<Collider>();


    public NPCAssistant npcAssistant;
    //only used for npcs where pathfinding and AI is done locally
    public LocalNPC l;
}