Loot Customizer

using UnityEngine;
using System.Collections;

public class Loot_Customizer : MonoBehaviour {

//--------------------PICKUP MANAGER--------------------//

	//By default, finds GameObjects with the tag "Player"
	public bool detectPlayerTag = true;
	
	//Manually assign the player otherwise
	public GameObject assignPlayer;

	//Declares player and playerDistance for later assignment
	GameObject player;
	float playerDistance;

//Loot vanishes when the player comes in contact with it
	public bool pickUpOnTouch = true;

//Loot vanishes when the player is nearby and presses the command key
	public KeyCode pickupCommand;

	public float pickupDistance = 1.0f;

//--------------------ANIMATION MANAGER--------------------//

//Pops the loot out of the chest in a charming and slightly randomized arch
	public bool lootAnimationCurves = true;
	
//Create animation curve and randomization
	public AnimationCurve animationCurve;
	public float animationLength = 0.5f;
	public float curveHeight = 1.0f;
	public float curveHeightVariation = 0.5f;
	public float curveLength = 2.0f;
	public float curveLengthVariation = 0.5f;
	public float arcAngle = 60.0f;

	//Runs animations at Start
	IEnumerator lootAnimation()
	{
		float elapsedTime = 0.0f;

		//Randomizers for curve height, length and angle
		curveHeight = Random.Range ((curveHeight), (curveHeight + curveHeightVariation));
		curveLength = Random.Range ((curveLength), (curveLength + curveLengthVariation));

		float randomRotY = Random.Range (-arcAngle, arcAngle);

		//Store parent transforms
		Vector3 parent_pos = new Vector3 (gameObject.transform.position.x, gameObject.transform.position.y, gameObject.transform.position.z);
		Vector3 parent_rot = new Vector3 (0, 0, 0);
		Vector3 parent_scale = new Vector3 (1, 1, 1);
		/*
		Vector3 parent_pos = new Vector3 (0, 0, 0);
		Vector3 parent_rot = new Vector3 (0, 0, 0);
		Vector3 parent_scale = new Vector3 (1, 1, 1);
		*/

		if (transform.parent != null) {
			parent_pos = transform.parent.localPosition;
			parent_rot = transform.parent.localEulerAngles;
			parent_scale = transform.parent.localScale;
		}

		//Set random rotation of curve if relevant
		if (arcAngle != 0)
		{
			parent_rot.y = randomRotY;
		}

		Quaternion quat = Quaternion.Euler (parent_rot);
		Matrix4x4 space = Matrix4x4.TRS (parent_pos, quat, parent_scale);

		Vector3 start_position = transform.localPosition;

		while (elapsedTime < animationLength)
		{
			//Generate position on Y axis
			float lootPosY = animationCurve.Evaluate(elapsedTime / animationLength) * curveHeight;
			Vector3 next_pos = new Vector3 ((start_position.x + curveLength * elapsedTime), lootPosY , 0);

			transform.localPosition = space * next_pos;
			
			yield return null;

			//Increment time towards ending the loop
			elapsedTime += Time.deltaTime;
		}
	}

//--------------------RUNTIME FUNCTIONS--------------------//

	// Use this for initialization
	void Start ()
	{
		//Sets the player variable or throws a warning
		if (detectPlayerTag)
		{
			player = GameObject.FindGameObjectWithTag ("Player");
		} else if (assignPlayer != null)
		{
			player = assignPlayer;
		} else {
			Debug.LogError ("No valid player assigned!  Loot will be non-interactable and will generate errors.  Please either \"Automically Detech Player\" if you are using the \"Player\" tag, or assign your playable character's GameObject to \"Assign Player\".");
		}

		//Checks to make sure loot can be picked up
		if (!pickUpOnTouch && pickupCommand == KeyCode.None)
		{
			Debug.LogError ("There is no way for the player to pick up loot!  Please either check \"Pick Up On Touch\" or assign a \"Pick Up Command\".");
		}

		//Run animation if requested
		if (lootAnimationCurves)
		{
			StartCoroutine ("lootAnimation");
		}
	}

	void Update()
	{	
		//Calculates player's distance from the chest
		playerDistance = Vector3.Distance (gameObject.transform.position, player.transform.position);
		
		//Pick up loot
		if ((Input.GetKeyDown (pickupCommand) && !pickUpOnTouch) || pickUpOnTouch)
		{
			//Check if the player is close enough to open the chest
			if (playerDistance <= pickupDistance)
			{
				Destroy(gameObject);
			}
		}
	}
}