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

public class RuntimeGizmo 
{
    public GameObject gizmo;
    protected GameObject prefab;
    public bool enabled = false;

    protected GameObject target;

    protected List<string> handleNames;

    protected float scaleRate = 1.0f;

    public virtual void Initialize() { }

    public virtual List<GameObject> RegisterObjectsToSelectDetector() { return null; }      //这样可以让Gizmo的指定组件可以使用TransformGizmo的操纵

    public virtual void Update() { }

    protected virtual void RenderUpdate()
    {
        //Gizmo Scale Update
        Vector3 cameraPosition = Camera.main.transform.position;
        Vector3 gizmoPosition = gizmo.transform.position;
        float distance = (cameraPosition - gizmoPosition).magnitude;
        gizmo.GetComponent<Transform>().localScale = new Vector3(distance, distance, distance);
    }

    protected virtual void FollowUpdate() { }

    protected void HideBeindCamera()
    {
        if (gizmo.activeSelf) { gizmo.SetActive(false); }
        gizmo.GetComponent<Transform>().position = Camera.main.transform.position - Camera.main.transform.forward * 10;
    }

    public virtual void EnableGizmo(GameObject target)
    {
        enabled = true;
        this.target = target;
        if (!gizmo.activeSelf) { gizmo.SetActive(true); }
        gizmo.GetComponent<Transform>().position = target.transform.position;
        gizmo.GetComponent<Transform>().rotation = target.transform.rotation;
    }

    public virtual void DisableGizmo()
    {
        enabled = false;
        this.target = null;
        HideBeindCamera();
    }
    public virtual void OnSelect(string handleName) { }

    public virtual void OnUnSelect() { }
    protected virtual void OnSelecting() { }

    protected virtual void ChangeRenderOnSelect() { }
    protected virtual void ChangeRenderOnUnSelect() { }
}