using System.Collections;
using System.Collections.Generic;
using NPOI.SS.Formula.Functions;
using PhxhSDK;
using TGS;
using UnityEditor;
using UnityEditor.Graphs;
using UnityEditor.SceneManagement;
using UnityEngine;

public partial class SceneBrush
{
    protected readonly Color BRUSH_COLOR = new Color(0.1453659f, 0.7463484f, 0.9433962f, 0.3f);
    protected readonly Color ERASER_COLOR = new Color(1, 0, 0, 0.3f);

    private const float ERASER_MAX_RADIUS = 20;
    private const float ERASER_MIN_RADIUS = 1;

    private RaycastHit[] _hits = new RaycastHit[1];

    protected bool _isHitGround;

    protected Vector3 _mouseHitPosition;

    protected Event _currEvent;

    protected GameObject _ground;

    private bool _isDragging;

    private int _undoGroupID;

    public virtual void OnInspectorGUI()
    {
        GUI.enabled = false;
        EditorGUILayout.EnumPopup("笔刷类型", brushType);
        GUI.enabled = true;
        
        if (Valid)
            GUI.enabled = false;
        EditorGUI.BeginChangeCheck();
        var tempPrefab =
            EditorGUILayout.ObjectField("笔刷预制:", prefab, typeof(GameObject), false) as GameObject;
        if (EditorGUI.EndChangeCheck())
        {
            OnPrefabChanged(tempPrefab);
            EditorUtility.SetDirty(this);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            return;
        }
        GUI.enabled = true;
        
        if (Valid)
        {
            Undo.RecordObject(this, BRUSH_UNDO_NAME);
            Undo.RecordObject(prefab, BRUSH_UNDO_NAME);
            renderInfo.RecordUndo(BRUSH_UNDO_NAME);
            remarkName = EditorGUILayout.TextField("备注", remarkName);

            isEraser = EditorGUILayout.Toggle("擦子", isEraser);
            if (isEraser)
            {
                radius = EditorGUILayout.Slider("笔刷半径", radius, ERASER_MIN_RADIUS, ERASER_MAX_RADIUS);
                eraseSameType = EditorGUILayout.Toggle("擦除同类", eraseSameType);
            }
            else
            {
                radius = 1;
                if (_tgs != null)
                    useTGS = EditorGUILayout.Toggle("对其网格", useTGS);
                scale = EditorGUILayout.FloatField("对象缩放", scale);
                yAngle = EditorGUILayout.FloatField("y轴旋转", yAngle);
                //objCount = EditorGUILayout.IntField("对象数目", objCount);
                //layout = (ESceneObjectLayout)EditorGUILayout.EnumPopup("分布类型", layout);
                canOverlap = EditorGUILayout.Toggle("允许重叠", canOverlap);
            }

            EditorUtility.SetDirty(this);
            EditorUtility.SetDirty(renderInfo);
        }
    }

    public virtual void OnSceneGUI(Event e)
    {
        ResetSceneGUIState(e);
        DrawMouse();
        HandleInput();
    }

    protected void ResetSceneGUIState(Event e)
    {
        _isHitGround = false;
        _mouseHitPosition = Vector3.zero;
        _currEvent = e;
        _ground = null;
    }

    protected void DrawMouse()
    {
        var mousePosSS = _currEvent.mousePosition;
        var ray = HandleUtility.GUIPointToWorldRay(mousePosSS);
        var count = Physics.RaycastNonAlloc(ray, _hits, 1000, 1 << LayerMask.NameToLayer("Ground"));
        if (count > 0)
        {
            var hit = _hits[0];
            _mouseHitPosition = hit.point;
            Handles.color = isEraser ? ERASER_COLOR : BRUSH_COLOR;
            Handles.DrawSolidDisc(_mouseHitPosition, Vector3.up, radius);
            _isHitGround = true;
            _ground = hit.collider.gameObject;
        }
    }

    protected void HandleInput()
    {
        if (!_isHitGround)
            return;


        var controlID = GUIUtility.GetControlID(FocusType.Passive);
        var eventType = _currEvent.GetTypeForControl(controlID);

        switch (eventType)
        {
            case EventType.MouseDown:
                if (_currEvent.button == 0)
                {
                    Undo.IncrementCurrentGroup();
                    _undoGroupID = Undo.GetCurrentGroup();
                    OnMouseDownInScene(_mouseHitPosition);

                    GUIUtility.hotControl = controlID;
                    _isDragging = true;
                }

                break;
            case EventType.MouseDrag:
                if (GUIUtility.hotControl == controlID && _isDragging)
                {
                    OnMouseDragInScene(_mouseHitPosition, Vector3.Distance(_mouseHitPosition, _lastDrawPosition));
                }

                break;
            case EventType.MouseUp:
                if (GUIUtility.hotControl == controlID && _currEvent.button == 0)
                {
                    OnMouseUpInScene(_mouseHitPosition);
                    _isDragging = false;
                    GUIUtility.hotControl = 0;
                    _currEvent.Use();
                    Undo.CollapseUndoOperations(_undoGroupID);
                }

                break;
            case EventType.ScrollWheel:
                if (_currEvent.control)
                {
                    Undo.RecordObject(this, BRUSH_UNDO_NAME);
                    radius += _currEvent.delta.y;
                    radius = Mathf.Clamp(radius, ERASER_MIN_RADIUS, ERASER_MAX_RADIUS);
                    _currEvent.Use();
                }

                break;
        }
    }
}