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

public class PanelItemBar : PanelBase
{
	public ItemWidget m_ItemTempalte;

	public UISimpleGrid m_ItemGrid;

	public Text m_TextName;

	private List<ItemWidget> m_Items = new List<ItemWidget>();

	private int m_CurrentIndex = 0;

	public override void Set(object param)
	{
		for(int i = 0; i < PlayerManager.Instance.items.Count; ++i)
		{
			ItemWidget widget = MakeItemWidget(PlayerManager.Instance.items[i]);
			m_Items.Add(widget);
		}

		SelectItemWidget(0);
	}

	bool SwitchToLeft()
	{
		return Input.GetButtonDown("LeftItem");
	}

	bool SwitchToRight()
	{
		return Input.GetButtonDown("RightItem");
	}

	bool UseItem()
	{
		return Input.GetButtonDown("Fire3");
	}

	ItemWidget MakeItemWidget(ItemBase item)
	{
		ItemWidget widget = Instantiate<ItemWidget>(m_ItemTempalte);
		widget.transform.SetParent(m_ItemGrid.transform);
		widget.gameObject.SetActive(true);
		widget.GetComponent<RectTransform>().anchoredPosition = new Vector2(0, 0);
#if UNITY_EDITOR
		widget.name = "item (" + item.name + ")";
#endif

		ItemWidgetParam param = new ItemWidgetParam();
		//param.onSelected = OnSelectItemWidget;
		param.item = item;
		widget.Set(param);
		return widget;
	}

	protected override void Update()
	{
		if (SwitchToLeft())
		{
			int newIndex = Mathf.Clamp(m_CurrentIndex - 1, 0, m_Items.Count - 1);
			SelectItemWidget(newIndex);
		}
		if (SwitchToRight())
		{
			int newIndex = Mathf.Clamp(m_CurrentIndex + 1, 0, m_Items.Count - 1);
			SelectItemWidget(newIndex);
		}
		if (UseItem())
		{
			m_Items[m_CurrentIndex].OnUseCallback();
			PlayerManager.Instance.UseItem(m_Items[m_CurrentIndex].item);
		}
	}

	void SelectItemWidget(int index)
	{
		if(index < 0 || index > m_Items.Count - 1)
		{
			return ;
		}
		m_Items[m_CurrentIndex].OnDeselectCallback();
		m_Items[index].OnSelectCallback();

		m_TextName.text = m_Items[index].item.name;

		m_CurrentIndex = index;
	}

}