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

public class CombatantSight : MonoBehaviour
{
    public List<GameObject> potentialViewedObjects;
    public List<GameObject> viewedCombatants;
    public bool isDebug;
    int layerMask;
    public bool hasPlayerLock = false;
    // Start is called before the first frame update
    void Awake()
    {
        layerMask = 1 << 9;
        //layerMask = ~layerMask;
    }

    private void Update()
    {
        UpdateSight();
        if( isDebug )
        {
            foreach( GameObject viewed in viewedCombatants )
            {
                Vector3 target = viewed.transform.position;
                Vector3 direction = target - transform.position;
                Debug.DrawRay( transform.position, direction, Color.red );
            }
        }

    }


    public void UpdateSight()
    {
        foreach( GameObject potential in potentialViewedObjects )
        {
            RunSightCheck( potential );
        }
    }

    private void RunSightCheck( GameObject viewable )
    {
        Vector3 target = viewable.transform.position;
        RaycastHit hit;
        Vector3 direction = target - transform.position;
        Debug.DrawRay( transform.position, direction, Color.green );
        if( Physics.Linecast( transform.position, target, out hit, layerMask, QueryTriggerInteraction.Ignore ) )
        {
            if( hit.collider.gameObject != viewable )
            {
                //Debug.Log( "hit " + hit.collider.gameObject.name + " , " + viewable.name );
                Debug.DrawRay( transform.position, direction, Color.red );
                //Debug.Log( hit );
                if( viewedCombatants.Contains( viewable ) )
                {
                    viewedCombatants.Remove( viewable );
                }
                if( viewable.tag == "Player" )
                {
                    hasPlayerLock = false;
                }
            }
            else
            {
                //Debug.Log( "found viewable combatant" );
                Debug.DrawRay( transform.position, direction, Color.white );
                if( !viewedCombatants.Contains( viewable ) )
                {
                    viewedCombatants.Add( viewable );
                }
                if (viewable.tag == "Player" )
                {
                    hasPlayerLock = true;
                }
            }

        }


    }

    private void OnTriggerEnter( Collider other )
    {
        //Debug.Log( "Trigger enter" );
        if( other.gameObject.layer == 9 )
        {
            //Debug.Log( "Other Combatant in view, adding to potential" );
            potentialViewedObjects.Add( other.gameObject );
            RunSightCheck( other.gameObject );

        }

        //else if( other.gameObject.tag == "Obstacle" )
        //{

        //}
    }


    private void OnTriggerExit( Collider other )
    {
        if( other.gameObject.layer == 9 )
        {
            potentialViewedObjects.Remove( other.gameObject );
            if( viewedCombatants.Contains( other.gameObject ) )
            {
                viewedCombatants.Remove( other.gameObject );
            }
            if( other.gameObject.tag == "Player" )
            {
                hasPlayerLock = false;
            }
        }
        //else if( other.gameObject.tag == "Obstacle" )
        //{

        //}
    }

}