using UnityEngine;
using System.Collections;
using System.Linq;

public enum ExplosiveState{
	Idle,
	Countdown,
	Explode,
	Exploded
}

public class Explosive : MonoBehaviour {

	public float explosionRadius = 1.0f;
	public float explosionForce = 100;
	private PlayerSensor _sensor;
	public float detonateDistance = 1.0f;
	private AudioSource _audio;
	public GameObject[] createOnExplosion;
	public bool destroySelf = true;
	public float hitPoints = 100;


	public void Explode(){

		var targets = Physics2D.OverlapCircleAll(transform.position, explosionRadius);
		targets = targets.Where(v => v.attachedRigidbody != null).ToArray();

		var rb = targets.Select(v => v.attachedRigidbody).Distinct();

		foreach(var t in rb){
			var v = (Vector2)(t.transform.position - transform.position);
			var forceVector = v.normalized;
			float k = 1.0f - Mathf.Clamp01(v.magnitude / explosionRadius);
			float forceMagnitude = k * explosionForce;
			t.AddForce(forceVector * forceMagnitude);

			float resultP = k * hitPoints;
			var health= t.gameObject.GetComponent<Health>();
			if(health != null){
				Debug.Log("Apply damage: " + resultP);
			health.ApplyDamage(resultP);
			}

		}

		foreach(var g in createOnExplosion){
			if(g != null){
				var instance = Instantiate(g);
				instance.transform.position = transform.position;
			}
		}



		if(destroySelf){
			Destroy(gameObject);
		}
	}
	
	void Start () {
		_sensor = GetComponentInChildren<PlayerSensor>();
		_sensor.PlayerEnter += HandlePlayerEnter;
		_audio = GetComponent<AudioSource>();
	}

	void HandlePlayerEnter (PlayerSensor sensor, GameObject player)
	{

		//Explode();
	}

	void Update () {
		if(Input.GetKeyDown(KeyCode.R)){
			Explode();
		}
	}

	void OnDrawGizmosSelected(){
		AdvancedGizmo.DrawCircle(transform.position, Vector3.forward, explosionRadius, Color.red, 36);
		AdvancedGizmo.DrawCircle(transform.position, Vector3.forward, detonateDistance, Color.blue, 36);
	}
}