using UnityEngine;
using System.Collections;

public abstract class ListBase : MonoBehaviour
{
	public Transform itemsAnchor;
	public GameObject listEmptyLabel;

	const float VERTICAL_SPACE_PER_ITEM = 150;
	const float OFFSET_Y = 100;

#if UNITY_EDITOR
	void OnEnable()
	{
		CreateRandomRequests();
	}

	void CreateRandomRequests()
	{
		listEmptyLabel.SetActive(false);
		for (int i = 0; i < 5; i++)
		{
			PlaceItem(CreateRandomItemForTestingInEditor(i), i);
		}
	}
#else
	void OnEnable()
	{
		if (HasItems())
		{
			listEmptyLabel.SetActive(false);
			CreateItems();
		} else
		{
			listEmptyLabel.SetActive(true);
		}
	}
#endif

	protected abstract bool HasItems();

	protected abstract void CreateItems();

	protected abstract Transform CreateRandomItemForTestingInEditor(int index);

	protected void PlaceItem(Transform itemTransform, int row)
	{
		Vector3 originalScale = itemTransform.localScale;
		itemTransform.parent = itemsAnchor;
		itemTransform.localScale = originalScale;
		itemTransform.localPosition = new Vector3(0, (row * -VERTICAL_SPACE_PER_ITEM) + OFFSET_Y);

		//HACK:For some unknown reason, NGUI is creating a UIPanel on the second viewing on mobiles.
		//Removing it, otherwise no proper clipping is done by the parent UIPanel.
		UIPanel itemUIPanel = itemTransform.GetComponent<UIPanel>();
		if (itemUIPanel != null)
		{
			Destroy(itemUIPanel);
		}
	}

}