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

public class Gun : MonoBehaviour {

	public float damage = 10f;
	public float range = 100f;

	public Transform gunEnd;

	[SerializeField]
	LayerMask mask;

	public ParticleSystem muzzleFlash;

	public LineRenderer gunRay;

	public float accuracy = 1f;

	float randomOffset_x;
	float randomOffset_y;
	float randomOffset_z;

	public GameObject gun;

	void Start(){
		gunRay.enabled = false;
	}

	void Update () {
		RaycastHit gunrayhit;
		Ray gunlookat = Camera.main.ScreenPointToRay(new Vector3(Screen.width / 2, Screen.height / 2 ));
		if (Physics.Raycast (gunlookat, out gunrayhit, range)) {
			gun.transform.LookAt (gunrayhit.point);
		}

		if (Input.GetButtonDown ("Fire1")) {
			Shoot ();
		}
	}

	void Shoot(){

		randomOffset_x = UnityEngine.Random.Range(0, 1 - accuracy);
		randomOffset_y = UnityEngine.Random.Range(0, 1 - accuracy);
		randomOffset_z = UnityEngine.Random.Range(0, 1 -accuracy);

		Vector3 direction = transform.forward;

		direction.x += randomOffset_x;
		direction.y += randomOffset_y;
		direction.z += randomOffset_z;


		muzzleFlash.Play ();

		RaycastHit cameraHit;

		Ray cameraAim = Camera.main.ScreenPointToRay(new Vector3(Screen.width / 2, Screen.height / 2 ));

		cameraAim.direction = direction;

		if (Physics.Raycast (cameraAim, out cameraHit, range, mask)) {
			Debug.DrawLine (cameraAim.origin, cameraHit.point, Color.green);

			Vector3 cameraHitPoint = cameraHit.point;
			float cameraDistance = cameraHit.distance ;


			if (Physics.Raycast (cameraAim, out cameraHit)) {

				RaycastHit playerHit;

				Ray ray = new Ray (gunEnd.transform.position, cameraHitPoint - gunEnd.transform.position);

				if (Physics.Raycast (ray, out playerHit, range)) {

					Debug.DrawRay (gunEnd.transform.position, cameraHitPoint - gunEnd.transform.position, Color.red);

					float playerDistance = playerHit.distance;

					Target target = playerHit.transform.GetComponent<Target> ();
					if (target != null) {
						target.TakeDamage (damage);
					}
					StartCoroutine (gunHit (playerHit));
				}
			}
		} else {
			Debug.DrawLine (cameraAim.origin, cameraAim.origin + cameraAim.direction * range, Color.green);

			StartCoroutine (gunMiss(cameraAim));
		}

	}
	IEnumerator gunHit(RaycastHit hit){
		gunRay.enabled = true;
		gunRay.SetPosition (0, gunEnd.position);
		gunRay.SetPosition (1, hit.point);
		yield return null;
		gunRay.enabled = false;
	}
	IEnumerator gunMiss(Ray ray){
		gunRay.enabled = true;
		gunRay.SetPosition (0, gunEnd.position);
		gunRay.SetPosition(1, ray.origin + ray.direction * range);
		yield return null;
		gunRay.enabled = false;

	}
}