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


/// <summary>
/// NPC交互，目前只有对话功能。所以只做对话功能。
/// </summary>
[RequireComponent(typeof(Collider))]
public class NpcInteract : InteractableObj
{
    [SerializeField]
    protected Npc_SO npc_SO;//根据读取的NpcSO来自动生成Npc
    [SerializeField]
    protected Transform pivotTrans;//名字支点Trans，需手动赋值

    protected Animator anim;

    public Npc_SO Npc_SO { get { return npc_SO; } }

    //Npc属性文件
    protected Dialog_SO dialog_SO;

    public void Awake()
    {
        if (npc_SO == null)
        {
            Destroy(gameObject);
            return;
        }

        //读取SO。设置Npc实体的各项属性
        dialog_SO = npc_SO.dialog_SO;

        //播放指定动画
        anim = GetComponentInChildren<Animator>();
        if (anim)
            anim.CrossFade(npc_SO.PlayAnimName, .2f);

        if (pivotTrans!=null)
        {
            Text textUI = GetComponentInChildren<Text>();
            if (textUI!=null)
                textUI.text = npc_SO.NpcName;
        }
    }

    private void OnEnable()
    {
        if (anim)
            anim.CrossFade(npc_SO.PlayAnimName,.2f);
    }

    protected void Update()
    {
        HandleNamePivot();
    }

    //覆盖父类的方法，UI调用接口的交互方法后调用
    protected override void Interact(PlayerManager playerManager)
    {
        base.Interact(playerManager);

        if (dialog_SO!=null)
        {
            UIManager.GetInstance().dialogPanel.StartADialog(dialog_SO, 0);

            //事件中心：交互NPC
            //TODO: 比较临时工的行为
            EventManager.GetInstance().EventTrigger("交互_"+npc_SO.NpcName);
            
        }
        else
        {
            Debug.Log("该NPC未配置对话文件");
        }
    }

    //处理显示名字的Pivot
    protected void HandleNamePivot()
    {
        if (pivotTrans == null) return;

        //检测与相机的距离
        //TODO:常量设置
        if (Vector3.Distance(Camera.main.transform.position, transform.position) < 15)
        {
            pivotTrans.gameObject.SetActive(true);
            pivotTrans.LookAt(Camera.main.transform.position);
        }
        else
        {
            pivotTrans.gameObject.SetActive(false);
        }
    }
    
}


/*
public class NpcInteract : InteractableObj
{
    [HideInInspector]
    public Animator anim;

    public string defaultAnim;//NPC默认初始播放的动画

    private void Start()
    {
        //播放指定动画
        anim = GetComponentInChildren<Animator>();
        anim.Play(defaultAnim);
    }
    public override void Interact(PlayerManager playerManager)
    {
        base.Interact(playerManager);

        Debug.Log("交互");
    }
}
*/