using UnityEngine;
using System.Collections;

public class AllyShip : MonoBehaviour 
{
	public SU_Thruster[] thrusters;
	public float rollRate = 100.0f;
	public float yawRate = 30.0f;
	public float pitchRate = 100.0f;
	public Vector3[] weaponMountPoints;	
	public Transform[] laserShotPrefab;
	public AudioClip[] soundEffectFire;
	public CameraFollow followCamera;
	public float life = 100;

	private bool isAlive = true;

	private Rigidbody _cacheRigidbody;
	private float shootFreq = 1f;
	private float lastShootTime = 0;
	private int weaponType = 0;

	private GameObject currentEnemyTarget;

	private static float ROTATION_SPEED = 0.75f; // degrees
	private static float SHOOT_RANGE = 2000.0f;
	private static float MIN_ENGAGE_RANGE = 300.0f;

	private static float HERO_MIN_RANGE = 1000.0f;
	private static float HERO_MAX_RANGE = 2000.0f;

	float genCoord(float min_distance, float max_distance) {
		return (Random.value - Random.value) * (min_distance + Random.value * (max_distance-min_distance));
	}

	void Start()
	{
		this.transform.position = new Vector3(
			genCoord(HERO_MIN_RANGE, HERO_MAX_RANGE),
			genCoord(HERO_MIN_RANGE, HERO_MAX_RANGE),
			genCoord(HERO_MIN_RANGE, HERO_MAX_RANGE) 
		);
	
		this.transform.rotation = Random.rotation;

		foreach (SU_Thruster _thruster in thrusters)
		{
			if (_thruster == null) 
			{
				Debug.LogError("Thruster array not properly configured. Attach thrusters to the game object and link them to the Thrusters array.");
			}
		}

		_cacheRigidbody = rigidbody;
		if (_cacheRigidbody == null) 
		{
			Debug.LogError("Spaceship has no rigidbody - the thruster scripts will fail. Add rigidbody component to the spaceship.");
		}
	}

	public void getHitted(float hit)
	{
		if (!isAlive) return;
		
		life -= hit;
		if (life<=0)
		{
			isAlive = false;
			Instantiate(GameManager.Instance.explosionEffect, this.transform.position, this.transform.rotation);
			CommunicationCenter.Instance.DestroyOneAlly(this.gameObject);
			Destroy(this.gameObject);
		}
	}
	
	void StartThruster()
	{
		foreach (SU_Thruster _thruster in thrusters) 
		{
			_thruster.StartThruster();
		}
	}

	void StopThruster()
	{
		foreach (SU_Thruster _thruster in thrusters) 
		{
			_thruster.StopThruster();
		}
	}

	void Update()
	{
		lastShootTime+=Time.deltaTime;

		if (currentEnemyTarget == null)
		{
			//Debug.Log ("Find target");
			currentEnemyTarget = GameManager.GetClosestShip(GameManager.ENEMY_TAG, this.gameObject);
		}

		if (currentEnemyTarget)
		{
			Transform enemyShip = currentEnemyTarget.transform;
			Debug.DrawLine(transform.position, enemyShip.position, Color.yellow);

			//transform.LookAt(enemyShip);
			Vector3 relative = enemyShip.position - transform.position;
			float distance = relative.magnitude;

			relative.Normalize();
		
			//Debug.DrawLine (this.transform.position, this.transform.position + targetDir*100.0f, Color.green);
			float step = ROTATION_SPEED * Time.deltaTime;
			Vector3 newDir = Vector3.RotateTowards (this.transform.forward, relative, step, 0.0f);
			this.transform.rotation = Quaternion.LookRotation (newDir);

			if (distance<MIN_ENGAGE_RANGE)
			{
				StopThruster();
			}
			else
			{
				StartThruster();
			}

			if ((distance<SHOOT_RANGE) && (Vector3.Dot (relative, transform.forward)>0.5) && (lastShootTime>shootFreq))
			{
				lastShootTime=0;
				foreach (Vector3 _wmp in weaponMountPoints) 
				{
					// Calculate where the position is in world space for the mount point
					Vector3 _pos = transform.position + transform.right * _wmp.x + transform.up * _wmp.y + transform.forward * _wmp.z;
					// Instantiate the laser prefab at position with the spaceships rotation
					// Specify which transform it was that fired this round so we can ignore it for collision/hit
					//Transform _laserShot = (Transform) Instantiate(laserShotPrefab[weaponType], _pos, transform.rotation);
					//_laserShot.GetComponent<SU_LaserShot>().firedBy = transform;
					WeaponFireUtils.FireLaser(laserShotPrefab[weaponType], _pos, this.transform.rotation, this.gameObject, GameManager.ENEMY_TAG);
				}
				if (soundEffectFire[weaponType] != null) 
				{
					audio.PlayOneShot(soundEffectFire[weaponType]);
				}
			}
		}
	}
}