using UnityEngine;
using System.Collections;
using UnityEngine.SceneManagement;
public class BirdScript : MonoBehaviour {
	// this global variable will be set from the inspector. Represents bird jump force
	public Vector2 jumpForce = new Vector2();
	//This is where you'll set the sprites in the editor
	public Sprite fly;
	public Sprite flap;
	private SpriteRenderer spriteRenderer;
	// function to be executed once the bird is created
	void Start () {
		// placing the bird
		transform.position = new Vector2(-2f,0f);
		//tk
		spriteRenderer = GetComponent<SpriteRenderer>();
		if (spriteRenderer.sprite == null){
			spriteRenderer.sprite = fly;
		}
	}
	// function to be executed at each frame
	void Update () {
		// waiting for mouse input
		if (Input.GetButtonDown("Fire1")) {
			// setting bird's rigid body velocity to zero
			GetComponent<Rigidbody2D>().velocity = Vector2.zero;
			// adding jump force to bird's rigid body
			GetComponent<Rigidbody2D>().AddForce(jumpForce);
			AudioSource audio = GetComponent<AudioSource>();
			audio.Play();
			//this triggers the animation every time you left click
			spriteRenderer.sprite = flap;
		}
		//this switches the sprite back when you release the left click
		if (Input.GetButtonUp ("Fire1")){
			spriteRenderer.sprite = fly;
		}
		// getting the real position, in pixels, of the bird on the stage
		Vector2 stagePos = Camera.main.WorldToScreenPoint(transform.position);
		// if the bird leaves the stage...
		if (stagePos.y > Screen.height || stagePos.y < 0){
			// ... call die function
			die();
		}
	}
	// function to be executed once the bird enters in collision with anything
	void OnCollisionEnter2D(){
		// call die function
		die();
	}
	void die(){
		// reload the current scene - actually restart the game
		SceneManager.LoadScene("Lose_Scene");
	}
}