using UnityEngine;
using System.Collections;

public class CameraFollow : MonoBehaviour
{
    public GameObject levelBorder;
    public GameObject player;
    private Rect m_viewPlane;
    private Bounds levelBounds;

    //triggers before Start
    void Awake()
    {
        //player = PlayerManager.Instance.PlayerObject;

        if (player != null)
        {
            Vector3 playerPosition = new Vector3(
                player.transform.position.x,
                player.transform.position.y,
                transform.position.z);

            transform.position = playerPosition;
        }

	ResetCameraBorder(levelBorder);
    }

    public void ResetCameraBorder(GameObject newLevelBorder)
    {
        if (levelBorder != null && levelBorder.collider2D != null)
            levelBounds = newLevelBorder.collider2D.bounds;
        else
            Debug.Log("MainCamera: level border not found or does not contain BoxCollider2D! Camera will be broken!");
    }

    void LateUpdate()
    {
	/*
        if (player == null)
        {
            player = PlayerManager.Instance.PlayerObject;
        }
	*/

        if (player != null)
        {
            Vector3 playerPosition = new Vector3(
                player.transform.position.x,
                player.transform.position.y,
                transform.position.z);

            transform.position = playerPosition;
        }

        if (levelBounds != null)
        {

            Vector3 bottomLeft = camera.ScreenToWorldPoint(new Vector3(0.0f, 0.0f, -transform.position.z));
            Vector3 topRight = camera.ScreenToWorldPoint(new Vector3(camera.pixelWidth, camera.pixelHeight, -transform.position.z));

            m_viewPlane = new Rect(bottomLeft.x, bottomLeft.y, topRight.x - bottomLeft.x, topRight.y - bottomLeft.y);

            Vector3 newPos = transform.position;

            newPos.x = Mathf.Clamp(newPos.x, levelBounds.min.x + (m_viewPlane.width / 2), levelBounds.max.x - (m_viewPlane.width / 2));

            newPos.y = Mathf.Clamp(newPos.y, levelBounds.min.y + (m_viewPlane.height / 2), levelBounds.max.y - (m_viewPlane.height / 2));

            transform.position = newPos;
        }

    }
}