using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour {
	
	public SpriteRenderer fuelBar; //related HUD element
	public SpriteRenderer fuelOverfillBar; //related HUD element

	public float fuelCapacity = 100.0f;
	public float fuelCostPerFrame = 0.3f;
	public float fuelForce = 1.5f;
	public float turnRate = 4.0f;

	public float fuelOverfillCapacity = 100.0f;
	public float fuelOverfillCostPerFrame = 0.7f;
	public float fuelOverfillForce = 2.0f;
	public float overfillTurnRate = 8.0f;

	public float fuelFromFood = 25.0f;
	public float flapForce = 70.0f;
	
	private Vector3 fuelScale;
	private Vector3 fuelOverfillScale;

	private float currentFuel;
	private float currentFuelOverfill;

	private bool paused = false;

	private GameObject menuObject;

	void Start() {
        //initiate all the values
		currentFuel = fuelCapacity;
		currentFuelOverfill = 0;

		menuObject = GameObject.Find ("Menu");
		fuelScale = fuelBar.transform.localScale;
		fuelOverfillScale = fuelOverfillBar.transform.localScale;
		
		Vector3 startPos = new Vector3(-10,-10,0);
		gameObject.rigidbody2D.transform.position = startPos;
		rigidbody2D.gravityScale = 0;

		paused = true;
	}

	void Update() {
        //adjust fuel bar HUD graphic scales to match the current fuel amount
		fuelBar.transform.localScale = new Vector3(fuelScale.x * (currentFuel/fuelCapacity), 1, 1);
		fuelOverfillBar.transform.localScale = new Vector3(fuelOverfillScale.x * (currentFuelOverfill/fuelCapacity), 1, 1);
	}

	void FixedUpdate() {
		if (paused) {
			return;
		}

		//rotate toward cursor
		Vector3 cursorPos = Camera.main.ScreenToWorldPoint
			(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 1));
		Vector3 targetDir = cursorPos - gameObject.transform.position;
		targetDir.Normalize();
		Vector3 angles = gameObject.transform.eulerAngles;

		//if overfull, propel at overfill rate
		if (currentFuelOverfill > 0) {
			//turn at overfill rate
			angles.z = Mathf.MoveTowardsAngle(gameObject.transform.eulerAngles.z, Mathf.Atan2(-targetDir.x,targetDir.y)*Mathf.Rad2Deg, overfillTurnRate);
			gameObject.transform.eulerAngles = angles;
			
			//get direction of movement
			Vector2 propulsionDirection = new Vector2(-Mathf.Sin(angles.z*Mathf.Deg2Rad), Mathf.Cos(angles.z*Mathf.Deg2Rad));
			propulsionDirection.Normalize();

			//spend fuel
			gameObject.rigidbody2D.velocity = (propulsionDirection*fuelOverfillForce);
			currentFuelOverfill -= fuelOverfillCostPerFrame;
			
			if (currentFuelOverfill <= 0) {
				currentFuelOverfill = 0;
			}
		}
		//otherwise, propel at standard speed
		else if (currentFuel >= 0) {
			//turn at standard rate, regardless of fuel
			angles.z = Mathf.MoveTowardsAngle(gameObject.transform.eulerAngles.z, Mathf.Atan2(-targetDir.x,targetDir.y)*Mathf.Rad2Deg, turnRate);
			gameObject.transform.eulerAngles = angles;

			if (currentFuel > 0) {
				//get direction of movement
				Vector2 propulsionDirection = new Vector2(-Mathf.Sin(angles.z*Mathf.Deg2Rad), Mathf.Cos(angles.z*Mathf.Deg2Rad));
				propulsionDirection.Normalize();
			
				//spend fuel
				gameObject.rigidbody2D.velocity = (propulsionDirection*fuelForce);
				currentFuel -= fuelCostPerFrame;
				
				if (currentFuel <= 0) {
					currentFuel = 0;
					rigidbody2D.gravityScale = 1;
				}
			}
		}
	}
	
	public void Reset() {
        //reset the bird's everything for a fresh game
		paused = false;

		currentFuel = fuelCapacity;
		currentFuelOverfill = 0;
		
		Vector3 startPos = new Vector3(0,0,0);
		Quaternion startRot = new Quaternion(0,0,0,0);
		transform.position = startPos;
		transform.rotation = startRot;
		rigidbody2D.gravityScale = 0;
		rigidbody2D.fixedAngle = true;
	}

	void OnTriggerEnter2D(Collider2D collider) {
		if (paused) return;

        //bird eats food!
		if (collider.tag == "Food") {
			GameObject.Find ("GetMeat").audio.Play();
			currentFuel += fuelFromFood;
			if (currentFuel > fuelCapacity) {
				GameObject.Find ("Overfill").audio.Play();
				currentFuelOverfill = currentFuel - fuelCapacity;
				currentFuel = fuelCapacity;
			}
			Destroy(collider.gameObject);

			rigidbody2D.gravityScale = 0;
		}
	}

	void OnCollisionEnter2D(Collision2D collision) {
		if (paused) return;

        //bird dies!
		if (collision.collider.tag == "Obstacle") {
			//GAME OVER MAN! show that sweet retry menu
			GameObject.Find ("Hit").audio.Play();
			GameObject.Find ("RecordScratch").audio.Play();
			GameObject.Find ("Blue_Danube_by_Strauss").audio.Stop();

			paused = true;
			rigidbody2D.gravityScale = 1;
			rigidbody2D.fixedAngle = false;
			menuObject.SetActive(true);
			Menu menu = menuObject.GetComponent<Menu>();
			menu.SetupRetry();

			GameObject.Find ("Obstacle Manager").GetComponent<ObstacleManager>().Pause ();
		}
	}
}