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

public class RayScript : MonoBehaviour
{
    // Start is called before the first frame update
    Transform topCannon;
    bool part1 = true;
    bool part2 = false;
    bool part3 = false;
    Material material;

    bool fire = false;

    Vector3 leftCannon = new Vector3((float)0.077, 0, (float)0.450);
    Vector3 rightCannon = new Vector3((float)-0.077, 0, (float)0.450);
    Vector3 topCannonPoint = new Vector3(0, (float)0.25, (float)-0.09);

    Transform explosion;
    Transform target;

    Matrix4x4 falconTrans;
    Vector3 partThreeRay;
    Quaternion cannonRotation;


    void Start()
    {
        topCannon = GameObject.Find("TopCannon").transform;
        explosion = GameObject.Find("Explosion").transform;
        target = GameObject.Find("FighterTarget").transform;
 
    }

    // Update is called once per frame
    void Update() {
        falconTrans = transform.localToWorldMatrix;
        partThreeRay = falconTrans.MultiplyPoint3x4(topCannonPoint);
        cannonRotation = Quaternion.Euler(0, 30, 0);

        bool hit = false;

        if (Input.GetKeyDown("space")) {
            print("Firing ray");
            fire = true;
            
            if (part1) {
                hit = Physics.Raycast(transform.position, transform.TransformDirection(Vector3.forward), Mathf.Infinity);
            } else if (part2) {
                var trans = transform.localToWorldMatrix;
                var transLeft = trans.MultiplyPoint3x4(leftCannon);
                var transRight = trans.MultiplyPoint3x4(rightCannon);
                hit = (Physics.Raycast(transLeft, transform.TransformDirection(Vector3.forward), Mathf.Infinity) ||
                       Physics.Raycast(transRight, transform.TransformDirection(Vector3.forward), Mathf.Infinity));                
            } else if (part3) {
                hit = Physics.Raycast(partThreeRay, transform.TransformDirection(cannonRotation * Vector3.forward), Mathf.Infinity);
            }

        } else if (Input.GetKeyUp("space")) {
            fire = false;
        }

        if (hit) {
            print("Hit");
            explosion.position = target.position;
            explosion.GetComponent<ParticleSystem>().Play();
        }

    }

     void OnRenderObject()
    {

        if (!fire) return;
        if (material == null)
            material = new Material(Shader.Find("Hidden/Internal-Colored"));
        material.SetPass(0);

        if (part1) {

            GL.Begin(GL.LINES);
            GL.Color(Color.red);
            GL.Vertex(transform.position);
            GL.Vertex(transform.position + (transform.TransformDirection(Vector3.forward)));
            GL.End();   
        } else if (part2) {
            var trans = transform.localToWorldMatrix;
            var transLeft = trans.MultiplyPoint3x4(leftCannon);
            var transRight = trans.MultiplyPoint3x4(rightCannon);

            
            GL.Begin(GL.LINES);
            GL.Color(Color.red);
            GL.Vertex(transLeft);
            GL.Vertex(transLeft + (transform.TransformDirection(Vector3.forward)));

            GL.Begin(GL.LINES);
            GL.Color(Color.red);
            GL.Vertex(transRight);
            GL.Vertex(transRight + (transform.TransformDirection(Vector3.forward)));
            GL.End();   
        } else if (part3) {
            topCannon.localPosition = topCannonPoint;

            GL.Begin(GL.LINES);
            GL.Color(Color.red);
            GL.Vertex(partThreeRay);
            GL.Vertex((partThreeRay + transform.TransformDirection(cannonRotation * Vector3.forward)));
            GL.End();  

        }
        
    }
}