using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour {

	float speed = 0;
	float baseSpeed = 5;

	Transform cam;
	Transform ghostPlayer;
	Transform trail;

	float camWidth;
	float playerSize;

	ParticleSystem trailSys;

	Level level;
	Fade fade;
	CountDown countDown;

	Menu menu;

	[SerializeField] GameObject explosion;

	bool alive = false;

	void Start () {
		menu = GameObject.Find("Main Camera").GetComponent<Menu>();
		level = GameObject.Find("Obstacles").GetComponent<Level>();
		countDown = GameObject.Find("countDown").GetComponent<CountDown>();
		fade = GameObject.Find("Obstacles").GetComponent<Fade>();
		cam = GameObject.Find("Main Camera").transform;
		camWidth = Camera.main.ViewportToWorldPoint(new Vector3(1,0,1)).x;
		ghostPlayer = GameObject.Find("GhostPlayer").transform;
		trail = GameObject.Find("trail").transform;
		playerSize = GetComponent<Renderer>().bounds.size.x;
		trailSys = trail.GetComponent<ParticleSystem>();
		transform.eulerAngles = new Vector3(0,0,0);
	}

	void Update () {
		if(!alive) return;

        // move player forward
		transform.position = new Vector3(transform.position.x + (speed * Time.deltaTime), transform.position.y, transform.position.z);
		cam.position = Vector3.Lerp(cam.position, new Vector3(0,transform.position.y,-10), .2f);

		trail.position = new Vector3(transform.position.x, transform.position.y, 1);

        // move player to other side if they exit screen
		if(transform.position.x + playerSize / 2 >= camWidth) {
			ghostPlayer.transform.position = new Vector3(transform.position.x - camWidth * 2, transform.position.y, 0);
			trail.position = new Vector3(ghostPlayer.position.x, ghostPlayer.position.y, 1);
			ghostPlayer.GetComponent<Renderer>().enabled = true;

			if(transform.position.x  - playerSize / 2 >= camWidth) {
				transform.position = new Vector3(ghostPlayer.position.x, transform.position.y, 0);
				ghostPlayer.GetComponent<Renderer>().enabled = false;
			}
		}
		else if(transform.position.x - playerSize / 2 <= -camWidth) {
			ghostPlayer.transform.position = new Vector3(transform.position.x + camWidth * 2, transform.position.y, 0);
			trail.position = new Vector3(ghostPlayer.position.x, ghostPlayer.position.y, 1);
			ghostPlayer.GetComponent<Renderer>().enabled = true;

			if(transform.position.x  + playerSize / 2 <= -camWidth) {
				transform.position = new Vector3(ghostPlayer.position.x, transform.position.y, 0);
				ghostPlayer.GetComponent<Renderer>().enabled = false;
			}
		}
		else {
			ghostPlayer.GetComponent<Renderer>().enabled = false;
		}

		float ypos = transform.position.y;
		float xpos = transform.position.x;

		foreach( Touch touch in Input.touches) {
			if(touch.phase == TouchPhase.Began) {
				if(menu.GetMenu() != 4)
				{
                    // switch player direction
					if(transform.eulerAngles.z == 0) {
						if(touch.position.x < Screen.width / 2) {
							transform.eulerAngles = new Vector3(0,0,45);
							speed = baseSpeed;
						} else if(touch.position.x >= Screen.width / 2) {
							transform.eulerAngles = new Vector3(0,0,-45);
							speed = -baseSpeed;
						}
					}

					speed = -speed;
					transform.eulerAngles = new Vector3(0,0,-transform.eulerAngles.z);
					transform.position = new Vector3(xpos, ypos,transform.position.z);
				}
			}
		}
	}

    // kill player if they hit obstacle
	void OnTriggerEnter2D (Collider2D c) {
        if (c.gameObject.tag != "Obstacle") return;

		alive = false;
		GetComponent<AudioSource>().Play();
		Instantiate(explosion, transform.position, Quaternion.identity);
		level.OnPlayerDies();
		ghostPlayer.GetComponent<SpriteRenderer>().enabled = false;
		trailSys.enableEmission = false;
		GetComponent<SpriteRenderer>().enabled = false;
		StartCoroutine(Reset(false));
	}

    // reset player & level for new round
	public IEnumerator Reset (bool fromMain) {
		if(!fromMain) yield return new WaitForSeconds(2);

		fade.FadeOut();
		Menu menu = GameObject.Find("Main Camera").GetComponent<Menu>();
		Color playerColor = menu.GetColor();
		GetComponent<SpriteRenderer>().color = playerColor;
		ghostPlayer.GetComponent<SpriteRenderer>().color = playerColor;
		trailSys.startColor = playerColor;

		yield return new WaitForSeconds(.5f);

		level.Initialize();
		countDown.Initialize();
		fade.FadeIn();
		speed = 0;
		transform.eulerAngles = new Vector3(0,0,0);
		transform.position = new Vector3(0, 0, 0);
		alive = true;
		GetComponent<SpriteRenderer>().enabled = true;
		trailSys.enableEmission = true;
	}
}