using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class magnetGun : MonoBehaviour {

	public Camera camera;
	public GameObject crossHair;
	public thirdPersonController playerController;
	public magnetGun otherPlayer;

	public string L_TRIGGER_INPUT;
	public string R_TRIGGER_INPUT;
	public string L_BUTTON_INPUT;
	public string R_BUTTON_INPUT;
	private bool L_Trigger_Down;
	
	public bool topScreen = true;
	private float playerScreen = 2;

	public GameObject gravityWell;
	public Collider GravityTarget;
	private Vector3 rayHitPoint;
	private Vector3 targetOffset;

	public float objectSpeed;
	public float magnetRange = 20;
	public float maxPullSpeed = 30;
	public float rotateSpeed;
	public float minDistance = 3.0f;
	public float closeRange = 5.0f;
	public float impulsePower = 50.0f;

	private RigidbodyConstraints originalConstrants;
	private bool originalGravity;

	private bool axisDown = false;


	private float normGrip;
	private Renderer lastTargetRenderer;
	private Color lastTargetColour;


	public GameObject magnetTipObject;


	//-----------------------
	// Use PlayerSound script
	// (specifically for object-rotation sounds for this MagnetGun script)
	public PlayerSounds _playerSoundScript;


	// Use this for initialization
	void Start () {
		if (topScreen)
			playerScreen = 2;
		else
			playerScreen = -1;

		normGrip = playerController.grip;

	
	}
	
	// Update is called once per frame
	void Update () {

		if (playerController.active) {
			float triggerL = Input.GetAxis (L_TRIGGER_INPUT);
			float triggerR = Input.GetAxis (R_TRIGGER_INPUT);


			Collider target = testItem ();

			crossHair.GetComponent<RawImage> ().color = Color.white;
			if (target != null) {
				if (target.GetComponent<Collider> ().tag == "moveable") {
					Debug.Log ("Moveable Item");
					crossHair.GetComponent<RawImage> ().color = Color.red;
					if (Vector3.Distance (rayHitPoint, camera.transform.position) <= closeRange) {
						crossHair.GetComponent<RawImage> ().color = Color.blue;
					}
				}
			}

			//updateColors (target);

			if (getAxisDown (L_TRIGGER_INPUT)) {
				Debug.Log ("axis down");
				//Debug.Log (GravityTarget.name);

				if (GravityTarget != null) {
					dropItem (GravityTarget);
					Debug.Log ("dropping item");
				} else {
					pickUpItem (target);
				}
			}


			/* (triggerL > 0) {
			if (!L_Trigger_Down) {
				pickUpItem (target);
				L_Trigger_Down = true;
			}
		} else {
			L_Trigger_Down = false;
			dropItem(GravityTarget);
		}
		*/
			if ( GravityTarget == null)
				impulsePush (target);
			else
				pullItem (triggerR);
		}
		moveItem (GravityTarget);
		rotateInput (GravityTarget);
		cameraRotateTest (GravityTarget);


	}



	private Collider testItem(){
		RaycastHit hit;

		//Vector3 rayDirection = camera.transform.rotation * Vector3.forward;
		//Ray ray = camera.ScreenPointToRay(new Vector3(Screen.width/2, Screen.height/2 + (Screen.height/6 * playerScreen), 0));
		
		Ray ray = camera.ScreenPointToRay(crossHair.transform.position);

		Debug.DrawRay (ray.origin, ray.direction*magnetRange, Color.green);

		if (Physics.Raycast (ray, out hit, magnetRange)) {
			if (hit.collider.tag == "moveable"){
				Debug.DrawRay (ray.origin,ray.direction*magnetRange, Color.red);
				rayHitPoint = hit.point;

			}


		}
		return hit.collider;
	}

	private void pickUpItem(Collider item){
		if (item != null) {

			//_playerSoundScript.PlayPickUp();

			if (item == otherPlayer.GravityTarget){
				otherPlayer.dropItem(item);
			}


			if (item.tag == "moveable"){
				originalConstrants = item.attachedRigidbody.constraints;
				originalGravity = item.attachedRigidbody.useGravity;

				item.attachedRigidbody.useGravity = false;
				item.attachedRigidbody.drag = 3.0f;
				item.attachedRigidbody.constraints = RigidbodyConstraints.FreezeRotation | originalConstrants;
				//camera.transform.LookAt(item.transform.position);
				//playerController.cameraX = camera.transform.eulerAngles.x;
				//playerController.cameraY = camera.transform.eulerAngles.y;
				gravityWell.transform.position = rayHitPoint;
				GravityTarget = item;
				targetOffset = GravityTarget.transform.position - rayHitPoint + (Vector3.up * 0.05f);


				playerController.slowed = true;
				playerController.movementLock = true;
				playerController.grip = 15.0f;

				if (!topScreen){
					playerController.cameraSpeedX = 0.0f;
					playerController.cameraSpeedY = 0.0f;
				}
			}
		}
	}

	private void impulsePush (Collider item){
		if (item != null) {

			if (item.tag == "moveable" && Input.GetButtonDown("Quick Push")){

				if (item == otherPlayer.GravityTarget){
					otherPlayer.dropItem(item);
				}

				Vector3 direction = (transform.position - item.transform.position).normalized;

				item.attachedRigidbody.AddForce(direction * impulsePower * maxPullSpeed* item.attachedRigidbody.mass,ForceMode.Impulse );
			}
		}
	}

	private void moveItem(Collider item){
		if (item != null)  {
			if (item != playerController.curCollider){
				float step = objectSpeed * Time.deltaTime;
				Vector3 direction = gravityWell.transform.position - item.transform.position + targetOffset;
				direction = Vector3.ClampMagnitude(direction,1.0f);

				item.attachedRigidbody.AddForce(direction * objectSpeed * Time.deltaTime);
			}
		}
	}

	private void dropItem(Collider item){
		if (item != null) {
			item.attachedRigidbody.useGravity = originalGravity;
			item.attachedRigidbody.drag = 0.0f;
			item.attachedRigidbody.constraints = originalConstrants;

			if(topScreen)
				item.attachedRigidbody.velocity = Vector3.ClampMagnitude (item.attachedRigidbody.velocity, 5);
			GravityTarget = null;

			playerController.slowed = false;
			playerController.movementLock = false;
			playerController.grip = normGrip;

			playerController.cameraSpeedX = 250.0f;
			playerController.cameraSpeedY = 120.0f;
		}

	}

	private void pullItem(float speed){

		if (!Input.GetButton ("Quick Push"))
			return;

		float step = maxPullSpeed * 0.5f * Time.deltaTime;

		Vector3 maxPull;
		maxPull = camera.transform.position + (camera.transform.rotation * Vector3.forward);


		if ((Vector3.Distance (gravityWell.transform.position, camera.transform.position) > minDistance && Vector3.Distance (gravityWell.transform.position, camera.transform.position) < magnetRange) || maxPullSpeed<1) {
			gravityWell.transform.position = Vector3.MoveTowards (gravityWell.transform.position, maxPull, step);
			//MagnetLaserShoot();

			if ((Vector3.Distance (gravityWell.transform.position, camera.transform.position) > magnetRange) && !topScreen)
				dropItem (GravityTarget);
		}

	}

	private void rotateInput(Collider item){
		if (item != null) {
				if (Input.GetButtonDown(L_BUTTON_INPUT))
					//_playerSoundScript.PlayRotateL(); // Rotate-Object Sound. ERROR: Held object continuously rotates
					StartCoroutine (rotateItem(item,new Vector3 (0,90,0),0.3f));
					
				if (Input.GetButtonDown(R_BUTTON_INPUT))
					//_playerSoundScript.PlayRotateR(); // Rotate-Object Sound. ERROR: Held object continuously rotates
					StartCoroutine (rotateItem(item,new Vector3 (90,0,0),0.3f));
		}
	}





	IEnumerator rotateItem (Collider item, Vector3 byAngles, float inTime){

		Quaternion startAngle = item.transform.rotation;
		Quaternion endAngle = Quaternion.Euler (item.transform.eulerAngles + byAngles);

		for (float i = 0; i < 1; i+=Time.deltaTime/inTime) {
			item.transform.rotation = Quaternion.Lerp(startAngle,endAngle,i);
			yield return null;
		}


	}

	public void cameraRotateTest(Collider item){

		if (item != null) {
			//Debug.Log ("distance test: " + Vector3.Distance (gravityWell.transform.position, camera.transform.position));
			if (Vector3.Distance (gravityWell.transform.position, camera.transform.position) <= closeRange) {
				playerController.cameraSpeedX = 250.0f;
				playerController.cameraSpeedY = 120.0f;
			} else {
				playerController.cameraSpeedX = 0.0f;
				playerController.cameraSpeedY = 0.0f;
			}

		}
	}

	public void updateColors(Collider target){

		if (target != null && target.tag == "moveable") {
			lastTargetRenderer = target.GetComponent<Renderer> ();

			if (lastTargetRenderer.material.color != Color.white) {
				lastTargetColour = lastTargetRenderer.material.color;
				lastTargetRenderer.material.color = Color.white;
			}


		} else {
			if (lastTargetRenderer != null)
				lastTargetRenderer.material.color = lastTargetColour;
		}


	}

	private bool getAxisDown (string axis){

		if( Input.GetAxisRaw(axis) != 0)
		{
			if(axisDown == false)
			{
				axisDown = true;
				return true;
			}
		}
		if( Input.GetAxisRaw(axis) == 0)
		{
			axisDown = false;
		} 
		return false;
	}



	// FUNCTION: Shoot Magnet Ray
//	void MagnetLaserShoot(){
//		RaycastHit hit;
//		
//		if(Physics.Raycast(magnetTipObject.transform.position, magnetTipObject.transform.forward, out hit)){
//			if(hit.collider.tag == "moveable"){
//				Debug.Log("Magnet laser has collided" + hit.collider.gameObject.name);
//			}
//		}
//	}


	
}