using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class BuildMode : MonoBehaviour
{

	public static BuildMode Instance { get; private set; }

	private int previewItemId = -1; //this is the item that the user is placing
	private GameObject previewObject;

	public void Awake()
	{
		Instance = this;
	}

	public void preview(int itemId)
	{
		if (itemId != -1)
		{
			GameObject clone = OnDemandLoader.Load<GameObject>("items/" + itemId);
			previewObject = Instantiate(clone);
		}
		else
		{
			//Destroy(previewObject);
		}
		previewItemId = itemId;
	}

	public void Update()
	{
		if (previewItemId != -1)
		{
			Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

			//do a raycast on the terrain
			RaycastHit hitInfo;
			if (Physics.Raycast(ray, out hitInfo, 1000.0f))
			{
				previewObject.SetActive(true);
				previewObject.transform.position = hitInfo.point;
				previewObject.transform.position = new Vector3(Mathf.Floor(hitInfo.point.x) + 0.5f,
					World.Instance.getHeight(hitInfo.point),
					Mathf.Floor(hitInfo.point.z) + 0.5f);
				previewObject.transform.localScale = new Vector3(8.0f, 8.0f, 8.0f);

				//make preview object transparent
				Renderer[] renderers = previewObject.GetComponentsInChildren<Renderer>();
				for (int i = 0; i < renderers.Length; i++)
				{
				    renderers[i].material.color = new Color(1.0f, 1.0f, 1.0f, 0.5f);
				}

				//previewObject.transform.rotation = Quaternion.FromToRotation(Vector3.up, hitInfo.normal);
			}
			else
			{
				previewObject.SetActive(false);
			}

			//check for click
			if (Input.GetMouseButtonDown(0))
			{
				PacketManager.sendPlaceItem(previewItemId, previewObject.transform.position.x, previewObject.transform.position.y, previewObject.transform.position.z, previewObject.transform.rotation.y);
				preview(-1);
			}

			//if the mouse wheen has scrolled up, rotate the previewObject
			if (Input.GetAxis("Mouse ScrollWheel") > 0f)
			{
				previewObject.transform.Rotate(Vector3.up, 10.0f);
			}
			else if (Input.GetAxis("Mouse ScrollWheel") < 0f)
			{
				previewObject.transform.Rotate(Vector3.up, -10.0f);
			}


		}
	}
}