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

// 用于控制一组 UIToggleSwap
public class TogglesControl : MonoBehaviour {

    private ToggleGroup toggleGroup;            // 控制唯一 Toggle 被勾选
    private Toggle[] toggles;                   // 子物体 toggles
    private UIToggleSwap[] toggleSwaps;         // toggles 显示脚本

    public delegate void VoidIntDelegate(int index);

    public event VoidIntDelegate OnTogglesSelect;       // 返回当前被选中的 Toggle 索引

    private bool hasInit = false;
    private void Awake()
    {
        Init();
    }

    private void Init()
    {
        if (!hasInit)
        {
            toggleGroup = transform.GetComponent<ToggleGroup>();
            toggles = transform.GetComponentsInChildren<Toggle>();
            toggleSwaps = transform.GetComponentsInChildren<UIToggleSwap>();

            for (int i = 0; i < toggles.Length; ++i)
            {
                toggles[i].group = toggleGroup;
                toggles[i].onValueChanged.AddListener(OnToggleChange);
                toggles[i].onValueChanged.AddListener(toggleSwaps[i].OnToggleSwap);
            }

            hasInit = true;
        }
    }

    /// <summary>
    /// 设置ToggleS组中某个Toggle成激活状态
    /// </summary>
    /// <param name="index">激活的的Toggle索引，0为第一个</param>
    public void SetToggleOn(int index = 0)
    {
        // 此处Init为解决当其他脚本在OnEnable调用时，该脚本会出现未初始化的情况。
        Init();
        if(toggles != null && index != -1)
        {
            if(index < toggles.Length)
            {
                toggles[index].isOn = true;
            }
        }
    }

    public void OnToggleChange(bool isOn)
    {
        if(isOn)
        {
            for(int i = 0; i < toggles.Length; i++)
            {
                if(toggles[i].isOn && OnTogglesSelect != null)
                {
                    OnTogglesSelect(i);
                    break;
                }
            }
        }
    }

    public void OnDisable()
    {
        foreach (Toggle tg in toggles)
        {
            tg.isOn = false;
        }
    }
}