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

namespace game
{
    [RequireComponent(typeof(PolygonCollider2D))]
    [RequireComponent(typeof(Image))]
    public class EditablePolygon : MonoBehaviour
    {
        public Color polygonColor = new Color(0.5f, 0.5f, 1f, 0.5f);
        public Vector2[] points = new Vector2[]
        {
            new Vector2(0, 0),
            new Vector2(100, 50),
            new Vector2(50, 100),
            new Vector2(-50, 50)
        };

        private PolygonCollider2D polygonCollider;
        private Image image;

        void OnValidate()
        {
            UpdatePolygon();
        }

        void Awake()
        {
            UpdatePolygon();
        }

        public void UpdatePolygon()
        {
            if (polygonCollider == null) polygonCollider = GetComponent<PolygonCollider2D>();
            if (image == null) image = GetComponent<Image>();

            polygonCollider.points = points;
            image.color = polygonColor;
        }
        public bool IsDown()
        {
            if (EventSystem.current == null)
            {
                return true;
            }
            PointerEventData pointerEventData = new PointerEventData(EventSystem.current)
            {
                position = Input.mousePosition
            };

            List<RaycastResult> results = new List<RaycastResult>();
            EventSystem.current.RaycastAll(pointerEventData, results);
            if (results.Count > 0 && results[0].gameObject == gameObject)
            {
                return true;
            }
            return false;
        }
        public bool ContainsPoint(Vector2 position)
        {
            if (!IsDown())
            {
                return false;
            }
            RectTransformUtility.ScreenPointToLocalPointInRectangle(
                transform as RectTransform,
                position,
                UIManager.Instance.UICanvas.worldCamera,
                out Vector2 localPoint);

            //bool flag = polygonCollider.OverlapPoint(localPoint);

            //if (IsPointInPolygon(localPoint, polygonCollider.points))
            //{
            //    Debug.LogError("点在多边形内");
            //}
            //else
            //{
            //    Debug.LogError("点不在多边形内");
            //}

            return IsPointInPolygon(localPoint, points);
        }

        bool IsPointInPolygon(Vector2 point, Vector2[] polygon)
        {
            int polygonLength = polygon.Length;
            bool inside = false;

            // 从点向右发射水平射线
            for (int i = 0, j = polygonLength - 1; i < polygonLength; j = i++)
            {
                Vector2 pi = polygon[i];
                Vector2 pj = polygon[j];

                // 检查点是否在顶点上
                if (Mathf.Approximately(point.x, pi.x) && Mathf.Approximately(point.y, pi.y))
                    return true;

                // 检查边是否与射线相交
                if (((pi.y > point.y) != (pj.y > point.y)) &&
                    (point.x < (pj.x - pi.x) * (point.y - pi.y) / (pj.y - pi.y) + pi.x))
                {
                    inside = !inside;
                }
            }
            return inside;
        }
    }
}

#if UNITY_EDITOR
namespace game
{
    using UnityEditor;

    [CustomEditor(typeof(EditablePolygon))]
    public class EditablePolygonEditor : Editor
    {
        private EditablePolygon polygon;
        private SerializedProperty pointsProperty;
        private SerializedProperty colorProperty;

        private const float handleSize = 10f;
        private int selectedIndex = -1;

        void OnEnable()
        {
            polygon = (EditablePolygon)target;
            pointsProperty = serializedObject.FindProperty("points");
            colorProperty = serializedObject.FindProperty("polygonColor");
        }

        public override void OnInspectorGUI()
        {
            serializedObject.Update();

            EditorGUILayout.PropertyField(colorProperty);
            EditorGUILayout.LabelField("多边形顶点", EditorStyles.boldLabel);

            for (int i = 0; i < pointsProperty.arraySize; i++)
            {
                EditorGUILayout.BeginHorizontal();
                EditorGUILayout.PropertyField(pointsProperty.GetArrayElementAtIndex(i),
                    new GUIContent("顶点 " + i));

                if (GUILayout.Button("删除", GUILayout.Width(50)))
                {
                    pointsProperty.DeleteArrayElementAtIndex(i);
                    serializedObject.ApplyModifiedProperties();
                    polygon.UpdatePolygon();
                    return;
                }
                EditorGUILayout.EndHorizontal();
            }

            if (GUILayout.Button("添加顶点"))
            {
                pointsProperty.arraySize++;
                serializedObject.ApplyModifiedProperties();
                polygon.UpdatePolygon();
            }

            serializedObject.ApplyModifiedProperties();
        }

        void OnSceneGUI()
        {
            RectTransform rectTransform = polygon.GetComponent<RectTransform>();

            for (int i = 0; i < polygon.points.Length; i++)
            {
                Vector2 point = polygon.points[i];
                Vector3 worldPoint = rectTransform.TransformPoint(point);

                Handles.color = i == selectedIndex ? Color.red : Color.green;

                // 绘制可拖拽的handle
                EditorGUI.BeginChangeCheck();
                var fmh_147_21_638823244657839550 = Quaternion.identity; Vector3 newWorldPoint = Handles.FreeMoveHandle(
                    worldPoint,
                    handleSize,
                    Vector3.zero,
                    Handles.CircleHandleCap);

                if (EditorGUI.EndChangeCheck())
                {
                    Undo.RecordObject(polygon, "Move Polygon Point");
                    polygon.points[i] = rectTransform.InverseTransformPoint(newWorldPoint);
                    polygon.UpdatePolygon();
                }

                // 检查点击选择
                if (Event.current.type == EventType.MouseDown &&
                    Event.current.button == 0 &&
                    Vector2.Distance(HandleUtility.WorldToGUIPoint(worldPoint),
                                   Event.current.mousePosition) < handleSize)
                {
                    selectedIndex = i;
                    Event.current.Use();
                }
            }

            // 绘制多边形线框
            Handles.color = polygon.polygonColor;
            Vector3[] worldPoints = new Vector3[polygon.points.Length + 1];
            for (int i = 0; i < polygon.points.Length; i++)
            {
                worldPoints[i] = rectTransform.TransformPoint(polygon.points[i]);
            }
            worldPoints[worldPoints.Length - 1] = worldPoints[0];
            Handles.DrawPolyLine(worldPoints);

            // 删除选中的顶点
            if (selectedIndex != -1 && Event.current.type == EventType.KeyDown &&
                Event.current.keyCode == KeyCode.Delete)
            {
                Undo.RecordObject(polygon, "Delete Polygon Point");
                var newPoints = new Vector2[polygon.points.Length - 1];
                for (int i = 0, j = 0; i < polygon.points.Length; i++)
                {
                    if (i != selectedIndex) newPoints[j++] = polygon.points[i];
                }
                polygon.points = newPoints;
                selectedIndex = -1;
                polygon.UpdatePolygon();
                Event.current.Use();
            }
        }
    }
}
#endif