using System.Collections;
using System.Collections.Generic;
using NaughtyAttributes;
using UnityEngine;

[RequireComponent(typeof(Rigidbody2D))]
public class Entity : MonoBehaviour 
{
	[SerializeField] [Required]
	GameFlowManager gameFlowManager = null!;

	[field: SerializeField] [field: Required]
	protected EntityStats stats { get; private set; }
	[field: SerializeField]protected float Health { get; private set; }
    [SerializeField]private float movementSpeed;
    [SerializeField]private float rotSpeed;
    [SerializeField]private float fov;
    [SerializeField]private float attackRange;
    [SerializeField]private float attackDmg;
    [SerializeField]protected float attackCooldown;
    protected float attackTimer;
    [SerializeField]private Transform target;
    private new string name;
    private Collider atkCollider;
    private Vector3 direction;
    Rigidbody2D rb;
    bool beingPushed;

    void Awake() => rb = GetComponent<Rigidbody2D>();

    protected virtual void Start() {
        direction = new Vector3(1,0,0);
        attackTimer = attackCooldown;
    }

    protected virtual void FixedUpdate() {
	    //TODO sqrMagnitude?
	    if (beingPushed && rb.velocity.magnitude < stats.MinVelocityWhenPushed) {
		    rb.velocity = Vector2.zero;
		    beingPushed = false;
	    }
    }

    protected virtual void Attack(){
	    // jason: TODO Either have target be Entity instead of transform, or skip Attack when GetComponent<Entity>() is null
        Entity targetEntity = target.GetComponent<Entity>();
        bool isTargetAlive = targetEntity.TakeDamage(attackDmg);
    }

    protected virtual void SpecialAttack(){

    }

    protected virtual void MoveToTarget(){
        
        direction = Vector3.RotateTowards(direction, (target.position - transform.position), rotSpeed*Time.fixedDeltaTime, 0.0f);
        if(!IsInAttackRange()){
	        rb.MovePosition(transform.position + direction * movementSpeed * Time.fixedDeltaTime);
        }
            
    }

    public void SetTarget(Transform newTarget){
        target = newTarget;
    }

    public Transform GetTarget(){
        return target;
    }

    //Apply damage to the entity, returns true if it is still alive
    public virtual bool TakeDamage(float amount){
        Health -= amount;
        if(Health <= 0){
            return false;
        }
        return true;
    }

    public void SetName(string name){
        this.name = name;
    }

    protected string GetName(){
        return this.name;
    }

    protected bool IsInAttackRange(){
        return Vector2.Distance(transform.position, target.position) <= attackRange;
    }

    protected bool IsLookingAtTarget(){
        float angle = Vector2.SignedAngle(direction, (target.position - transform.position));
        return angle >= -fov && angle <= fov;
    }

    protected void AddImpulse(Vector3 impulse) {
	    beingPushed = true;
	    rb.AddForce(impulse, ForceMode2D.Impulse);
    }
}