using System.Linq;
using Unity.Mathematics;
using UnityEditor;
using UnityEditor.EditorTools;
using UnityEditor.IMGUI.Controls;
using UnityEditorInternal;
using UnityEngine;
using UnityEngine.UIElements;

namespace X.Rendering.Scene
{
    [CustomEditor(typeof(SceneEffect))]
    public class SceneEffectEditorBase : Editor
    {
        ReorderableList lightList;
        Transform transform;
        int selectIndex = -1;
        Vector4 mainLightDir = Vector4.zero;

        SerializedProperty boundsProperty;
        private BoxBoundsHandle boundsHandle = new();
        LightData[] lightDatas = null;

        public override VisualElement CreateInspectorGUI()
        {
            transform = (target as MonoBehaviour).transform;
            var mainLight = GameObject.FindGameObjectWithTag("MainLight")?.GetComponent<Light>();
            if (mainLight == null)
            {
                mainLight = GameObject.FindObjectsOfType<Light>().Where(l => l.type == LightType.Directional).First();
            }

            if (mainLight != null)
            {
                mainLightDir = (mainLight.transform.rotation * Vector3.forward).normalized;
                mainLightDir.w = 1;
            }

            lightList = new ReorderableList(serializedObject, serializedObject.FindProperty("capsuleLights"), true, true, true, true);
            lightList.onSelectCallback += (_) =>
            {
                Debug.Log($"{lightList.index}");
                selectIndex = lightList.index;
            };
            var t = serializedObject.targetObject.GetType().GetField("capsuleLights", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);
            lightDatas = t.GetValue(serializedObject.targetObject) as LightData[];

            lightList.onAddCallback += (_) =>
            {
                if (lightList.index == -1 && lightList.count == 0)
                {
                    lightList.index = 0;
                }
                lightList.serializedProperty.InsertArrayElementAtIndex(lightList.index);
                serializedObject.ApplyModifiedProperties();

                var light = new LightData()
                {
                    isPointLight = true,
                    lightIntensity = 1,
                    lightPosition = transform.position + Vector3.up
                };

                if (lightDatas != null)
                {
                    lightDatas[lightList.index] = light;
                    lightList.Select(lightList.index);
                }
            };

            lightList.drawHeaderCallback = DrawHeader;

            lightList.drawElementCallback = DrawListItems;

            boundsProperty = serializedObject.FindProperty("Bounds");

            return base.CreateInspectorGUI();
        }

        private void DrawListItems(Rect rect, int index, bool isActive, bool isFocused)
        {
            if(index < 0 )
            {
                return;
            }

            EditorGUI.BeginChangeCheck();
            var light = lightDatas[index];
            float x = rect.x;
            //EditorGUI.LabelField(new Rect(x, rect.y, 50, EditorGUIUtility.singleLineHeight), "点光");
            //x += 50;
            EditorGUI.LabelField(new Rect(x, rect.y, 150, EditorGUIUtility.singleLineHeight), $"{light.lightPosition}");
            x += 140;
            light.lightIntensity = EditorGUI.Slider(new Rect(x, rect.y, 200, EditorGUIUtility.singleLineHeight), light.lightIntensity, 0.2f, 2);
            x += 210;
            light.isPointLight = EditorGUI.ToggleLeft(new Rect(x, rect.y, 50, EditorGUIUtility.singleLineHeight), "点光", light.isPointLight);
            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(target, "DrawListItems");
                CallValidate();
            }
        }

        private void DrawHeader(Rect rect)
        {
            string name = "光照方向";
            EditorGUI.LabelField(rect, name);
        }

        public override void OnInspectorGUI()
        {
            serializedObject.Update();
            base.OnInspectorGUI();
            lightList.DoLayoutList();
            serializedObject.ApplyModifiedProperties();
        }

        private void OnDestroy()
        {
            Tools.hidden = false;
        }

        public void OnSceneGUI()
        {
            DrawBoundHandle();
            if (selectIndex == -1 || lightList == null || selectIndex >= lightList?.serializedProperty.arraySize)
            {
                return;
            }
            var light = lightDatas[selectIndex];
            Tools.hidden = true;

            if (!light.isPointLight)
            {
                var rot = (float3)light.lightPosition;
                rot += DrawRotationHandle(light.lightPosition);
                light.lightPosition = rot;
            }
            else
            {
                var pos = (float3)light.lightPosition;
                pos += DrawPositionHandle(light.lightPosition);
                light.lightPosition = pos;
            }
            serializedObject.ApplyModifiedProperties();
        }

        protected void CallValidate()
        {
            target.GetType().GetMethod("OnValidate", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance).Invoke(target, null);
        }

        protected float3 DrawPositionHandle(Vector3 vec)
        {
            EditorGUI.BeginChangeCheck();
            var newPos = Handles.PositionHandle(vec, Quaternion.identity);
            float3 delta = float3.zero;
            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(target, "DrawPositionHandle");
                delta = newPos - vec;
                CallValidate();
            }

            return delta;
        }

        protected float3 DrawRotationHandle(Vector3 vec)
        {
            EditorGUI.BeginChangeCheck();
            var rotation = Quaternion.LookRotation(vec);
            Vector3 newEuler = Vector3.zero;
            Vector3 oldEuler = rotation.eulerAngles;

            var col = Handles.color;
            var pos = transform.position;
            if (boundsProperty != null)
            {
                pos = boundsProperty.boundsValue.center;
            }

            Handles.color = Handles.xAxisColor;
            newEuler.x = Handles.Disc(Quaternion.Euler(oldEuler.x, 0, 0), pos, Vector3.left, HandleUtility.GetHandleSize(pos) * 1.5f, false, 0.1f).eulerAngles.x;

            Handles.color = Handles.yAxisColor;
            newEuler.y = Handles.Disc(Quaternion.Euler(0, oldEuler.y, 0), pos, Vector3.up, HandleUtility.GetHandleSize(pos) * 1.5f, false, 0.1f).eulerAngles.y;
            //var newRot = Handles.RotationHandle(rotation, pos);

            EditorGUI.EndChangeCheck();

            Handles.ConeHandleCap(0, pos, Quaternion.Euler(newEuler), HandleUtility.GetHandleSize(pos), EventType.Repaint);

            Handles.color = col;

            float3 delta = float3.zero;
            var newVec = (Quaternion.Euler(newEuler) * Vector3.forward).normalized;
            if (newVec != vec)
            {
                Undo.RecordObject(target, "DrawRotationHandle");
                delta = newVec - vec;
                CallValidate();
            }

            return delta;
        }

        protected void DrawBoundHandle()
        {
            if (boundsProperty == null)
            {
                return;
            }

            EditorGUI.BeginChangeCheck();
            var bounds = boundsProperty.boundsValue;
            var col = Handles.color;
            Handles.color = Color.green;
            var newPos = Handles.PositionHandle(bounds.center, transform.rotation);
            boundsHandle.center = bounds.center;
            boundsHandle.size = bounds.size;
            boundsHandle.DrawHandle();
            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(target, "DrawBoundHandle");
                bounds.center = newPos;
                bounds.size = boundsHandle.size;
                boundsProperty.boundsValue = bounds;
            }
            boundsProperty.serializedObject.ApplyModifiedProperties();
            Handles.color = col;
        }
    }


    [CustomEditor(typeof(CapsuleShadowAreaEffect))]
    public class MyClaCapsuleShadowAreaEffectsEditor : SceneEffectEditorBase
    {

    }


    //[CustomPropertyDrawer(typeof(CapsuleShadowAreaSetting))]
    //public class CapsuleShadowAreaSettingDrawer : PropertyDrawer
    //{
    //    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    //    {
    //        EditorGUI.BeginProperty(position, label, property);
    //        EditorGUI.PropertyField(new Rect(position.x, position.y, 30, position.height), property.FindPropertyRelative("AmbientIntensity"), GUIContent.none);
    //        EditorGUI.PropertyField(new Rect(position.x + 35, position.y, 50, position.height), property.FindPropertyRelative("ShadowIntensity"), GUIContent.none);
    //        EditorGUI.PropertyField(new Rect(position.x + 90, position.y, position.width - 90, position.height), property.FindPropertyRelative("ShadowSharpness"), GUIContent.none);

    //        EditorGUI.EndProperty();
    //    }
    //}
}