using UnityEngine;
using XUtliPoolLib;

public abstract class XWall : MonoBehaviour
{
    protected bool _forward_collision;
    protected IXPlayerAction _interface;

    private BoxCollider _box = null;

    private Vector3 _left;
    private Vector3 _right;

	// Use this for initialization
	void Awake ()
    {
        _box = GetComponent<BoxCollider>();
        _box.enabled = false;

        Vector3 half = Vector3.Cross(Vector3.up, transform.forward) * _box.size.x * _box.transform.localScale.x * 0.5f;

        _left  = _box.center + _box.transform.position - half;
        _right = _box.center + _box.transform.position + half;
	}

    void Update()
    {
        if (_interface == null || _interface.Deprecated) _interface = XInterfaceMgr.singleton.GetInterface<IXPlayerAction>(1);

        if (_interface != null && _interface.IsValid)
        {
            Vector3 pos = _interface.PlayerPosition(!(this is XCameraWall));
            Vector3 last_pos = _interface.PlayerLastPosition(!(this is XCameraWall));

            if ((last_pos - pos).sqrMagnitude > 0)
            {
                CollisionDetected(pos, last_pos);
            }
        }
    }

    private void CollisionDetected(Vector3 pos, Vector3 last)
    {
        if (XCommon.singleton.IsLineSegmentCross(last, pos, _left, _right))
        {
            Vector3 dir = pos - last;

            _forward_collision = Vector3.Dot(dir, transform.forward) > 0;
            OnTriggered();
        }
    }

    protected abstract void OnTriggered();
}