using UnityEngine;
using System.Collections;

public class GoblinMovement : MonoBehaviour 
{
	public Vector3 currPosition;
	public GameObject goblin;
	Vector3 distance;
	public float speed;
	public float turnSpeed;
	public float minDistance;
	public float attackRange;
	public GameObject target;
	public bool move;
	public bool grounded;
	public float attackRate;
	Quaternion targetRotation;
	public float damage;
	public float sightRange;
	float timer = 0.0F;
	int state = 0;
	public GameObject bloodsplatter;
	public AudioClip hitSound;
	public GameObject Legs;
	public float attackChance;
	private int  difficulty;
	// Use this for initialization
	void Start ()
	{
		 difficulty = PlayerPrefs.GetInt("difficulty");
		
		
		//switch the difficulty and based on the difficulty change the kill goals
		switch(difficulty)
			{
			case 0:
				//leave the settings as they are since they are so easy
				break;
			case 1:
				//change the attacking chances to 50/50
				attackChance = 50.0F;
				break;
			case 2:
				//change the attacking change to 25 meaning 75% of the time they hit
				attackChance = 25.0F;
				break;
			}
		target = GameObject.Find("Barbarian");
	}
	void FixedUpdate()
	{
		if(move && grounded)
		{
			 Legs.animation.CrossFade("RelaxedWalk",0.2F);
			rigidbody.velocity = transform.forward * speed;	
		}
		else
		rigidbody.velocity = -transform.up * speed;
	}
	// Update is called once per frame
	void Update ()
	{
		if(target == null)
			return;
		// Create a particle if hit
		currPosition = target.transform.position;
		
		Vector3 rayDir = transform.TransformDirection(Vector3.forward);
		RaycastHit hitGob;
		
		//if there is a goblin in front of us we do not move
		if(Physics.Raycast (transform.position,rayDir,out hitGob, sightRange))
		{
			if(hitGob.transform.gameObject.tag == "Goblin")
			{
				move = false;
				targetRotation = Quaternion.LookRotation(currPosition 
														   - transform.position 
		       	                                          ,Vector3.up);	
				
				//rotate towards the target
				transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation , 
			                                           Time.deltaTime * turnSpeed);
				
				//make sure we only rotate on 1 axis and that is Y-Axis
				transform.rotation =  Quaternion.Euler(new Vector3(0f,transform.rotation.eulerAngles.y, 0f));
			}
		}else if( Vector3.Distance( currPosition, transform.position ) > minDistance && grounded )
		{
						
						//flip the flag for movement to true
						move = true;	
						goblin.animation.CrossFade("idle",1.2F);
						//if the player is further than 10 feet then add his velocity to
						//to where the goblin is looking so it can intercept other wise look
						//at the player
						if( Vector3.Distance( currPosition, transform.position ) > 10)
						{
						 	targetRotation = Quaternion.LookRotation (currPosition
																	- transform.position 
																	+ target.rigidbody.velocity
		       	                                              		, Vector3.up  );
						}else
						{
							//just look at the player since we are so close
							targetRotation = Quaternion.LookRotation (currPosition
																	- transform.position 
		       	                                              		, Vector3.up  );
						}
						//rotate towards the target
						transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation , 
			                                           Time.deltaTime * turnSpeed);
				
						//make sure we only rotate on 1 axis and that is Y-Axis
						transform.rotation =  Quaternion.Euler(new Vector3(0f,
				                                             transform.rotation.eulerAngles.y, 0f));
						
				
			}else
			{
					move = false;
					
				 	targetRotation = Quaternion.LookRotation (currPosition - transform.position
		       	                                              , Vector3.up);
					transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, 
			                                           Time.deltaTime * turnSpeed);
			
					transform.rotation =  Quaternion.Euler(new Vector3(0f,
				                                             transform.rotation.eulerAngles.y, 0f));
				
				timer += Time.deltaTime * 1;
			
				if(timer > attackRate && Vector3.Distance( currPosition, transform.position ) < attackRange)
				{
					
					Legs.animation.CrossFade("Standing",2.2F);
					goblin.animation.CrossFade("run",2.2F);
					float randomTemp;
					Random.seed = (int)(Time.time + transform.position.x + transform.position.z);
			
					randomTemp = Random.Range(1, 100);
				
					if(randomTemp > attackChance)
					{
						
						target.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
						AudioSource.PlayClipAtPoint(hitSound, target.transform.position);
						Instantiate(bloodsplatter,target.transform.position,new Quaternion(0,180,0,0));
					}
					timer = 0.0F;
				}
			}
		
		
		
	}
	
	
	// This part detects whether or not the object is grounded and stores it in a variable
	void OnCollisionEnter (  Collision terrain)
	{
		if(terrain.gameObject.tag == "ground")
		{
    		state ++;
    		if(state > 0)
    		{
				grounded = true;
			}
		}
		
	}
	
	//once we leave the ground start decreasing from the state
	//so we know we left the ground
	void OnCollisionExit (Collision terrain)
	{
		if(terrain.gameObject.tag == "ground")
		{
			state --;
    		if(state < 1)
    		{
				grounded = false;
				state = 0;
			}
		}
		
	}
}