using System;
using UnityEngine;
using UnityEngine.UI;

namespace SceneView
{
    public class CanvasControl : MonoBehaviour
    {
        public const string ViewCanvasName = "_SceneViewCanvas";
        public const string ShowAim = "";

        public static Vector2 panelSize = new Vector2(500, 800);

        private static GameObject _focusObject;
        public SceneViewPanel? sceneViewPanel;
        public ParametersPanel? parametersPanel;

        public static GameObject FocusGameObject
        {
            get => _focusObject;
            set
            {
                if (value != _focusObject)
                {
                    if (_focusObject)
                    {
                        var outline=_focusObject.GetComponent<Outline>();
                        if (outline)
                            Destroy(outline);
                    }
                    _focusObject = value;
                    var outlineNew= _focusObject.AddComponent<Outline>();
                    outlineNew.effectColor = Color.blue;
                    outlineNew.effectDistance = new Vector2(1, -1);
                    outlineNew.useGraphicAlpha = true;
      
                    OnChangeFocusObject?.Invoke(value);
                }
            }
        }

        private void Start()
        {
            InitCanvas();
        }

        public void Update()
        {
            if (Input.GetKeyDown(KeyCode.F3))
            {
                // Debug.Log("切换");
                parametersPanel.gameObject.SetActive(!parametersPanel.gameObject.activeSelf);
                sceneViewPanel.gameObject.SetActive(!sceneViewPanel.gameObject.activeSelf);
            }
            // if (sceneViewPanel.gameObject.activeSelf)
            // {
            //     sceneViewPanel.Refresh();
            // }
        }

        private void OnDestroy()
        {
            if (sceneViewPanel) Destroy(sceneViewPanel.gameObject);
            if (parametersPanel) Destroy(parametersPanel.gameObject);
        }

        public static event Action<GameObject> OnChangeFocusObject;

        private void InitCanvas()
        {
            var canvasObj = new GameObject(ViewCanvasName);
            var canvas = canvasObj.AddComponent<Canvas>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            canvas.sortingOrder = 1000;
            canvasObj.AddComponent<CanvasScaler>();
            canvasObj.AddComponent<GraphicRaycaster>();
            DontDestroyOnLoad(canvasObj);

            sceneViewPanel = CreateSceneViewPanel(canvasObj.transform);
            parametersPanel = CreateParametersPanel(canvasObj.transform);
        }

        public static SceneViewPanel CreateSceneViewPanel(Transform parent)
        {
            var panelObj = new GameObject(ViewCanvasName);
            panelObj.transform.SetParent(parent, false);
            var sceneViewPanel = panelObj.AddComponent<SceneViewPanel>();
            var panelImage = panelObj.AddComponent<Image>();
            panelImage.color = new Color(0.5f, 0.5f, 0.5f, 0.3f);

            var rectTransform = panelObj.GetComponent<RectTransform>();
            rectTransform.sizeDelta = panelSize;

            return sceneViewPanel;
        }

        public ParametersPanel CreateParametersPanel(Transform parent)
        {
            var panelObj = new GameObject(ViewCanvasName);
            panelObj.transform.SetParent(parent, false);
            var parametersViewPanel = panelObj.AddComponent<ParametersPanel>();
            var panelImage = panelObj.AddComponent<Image>();
            panelImage.color = new Color(0.5f, 0.5f, 0.5f, 0.3f);
            return parametersViewPanel;
        }
    }
}