using UnityEngine;
using System.Collections;

public class PopUpManager : MonoBehaviour {

	public static bool modal = false;

	public static void UpdateModal()
	{
		PopUpPanel[] popUpPanels = GameObject.FindObjectsOfType<PopUpPanel>();
		for(int i=0; i<popUpPanels.Length; i++)
		{
			PopUpPanel panel = popUpPanels[i];
			if(panel.modal == true && panel.gameObject.activeSelf == true)
			{
				modal = true;
				return;
			}
		}
		modal = false;
	}

	public static PopUpPanel AddPopUp(GameObject panelPrefab, Transform parent=null, bool modal=false, System.Type panelType=null)
	{
		if(panelPrefab == null)
			return null;

		GameObject gameObj = Instantiate(panelPrefab) as GameObject;
        PopUpPanel panel = null;
        if (panelType != null)
        {
            panel = (PopUpPanel)gameObj.AddComponent(panelType);
        }
        else
        {
            panel = gameObj.GetComponent<PopUpPanel>();
        }

		panel.gameObject.AddComponent<PopUpUtil>();
		PopUpManager.AddToMainCanvas(gameObj, parent);

		panel.modal = modal;
		UpdateModal();
		return panel;
	}


	public static T AddPopUp<T>(GameObject panelPrefab, Transform parent=null, bool modal=false) where T : PopUpPanel
	{
		if(panelPrefab == null)
			return null;

		GameObject gameObj = Instantiate(panelPrefab) as GameObject;
		T panel = gameObj.GetComponent<T>();
		if (panel == null)
		{
			panel = gameObj.AddComponent<T>();
		}

		if(panel.GetComponent<PopUpUtil>() == null)
			panel.gameObject.AddComponent<PopUpUtil>();
		
		PopUpManager.AddToMainCanvas(gameObj, parent);

		panel.modal = modal;
		UpdateModal();
		return panel;
	}


	public static void AddToMainCanvas(GameObject gameObj, Transform parent = null)
	{
		RectTransform rectTrans = gameObj.GetComponent<RectTransform>();
		if(rectTrans != null)
		{
			Vector3 originPos = rectTrans.localPosition;
			Vector3 originSizeDelta = rectTrans.sizeDelta;

			if(parent == null)
			{
				Canvas canvas = GameObject.FindObjectOfType<Canvas>();
				parent = canvas.transform;
			}
			gameObj.transform.SetParent(parent);
	        gameObj.transform.localScale = new Vector3(1f, 1f, 1f);
			rectTrans.localPosition = originPos;
			rectTrans.sizeDelta = originSizeDelta;
		}
		else
		{
			Vector3 pos =gameObj.transform.localPosition;
			Vector3 scale = gameObj.transform.localScale;
			if(parent == null)
			{
				MainCanvas canvas = GameObject.FindObjectOfType<MainCanvas>();
				parent = canvas.transform;
			}
			gameObj.transform.SetParent(parent);
			gameObj.transform.localScale = scale;
			gameObj.transform.localPosition = pos;
		}
	}

	public static void RemovePopUp(PopUpPanel panel)
	{
		Destroy(panel.gameObject);
		UpdateModal();
	}
}