using mh;
using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting.Antlr3.Runtime.Tree;
using UnityEngine;
using UnityEngine.UIElements;

/// <summary>
/// 物理查询
/// </summary>
public partial class PhysicsManager : Singleton<PhysicsManager>
{
    // 碰撞检测结果
    private List<IQuadTreeObject> m_SharedCollideResults = new List<IQuadTreeObject>();

    public static Vector4 GetCircleBound(Vector3 circle)
    {
        float size = circle.z * 2;
        return new Vector4(circle.x, circle.y, size, size);
    }

    public static Vector4 GetBoxBound(Vector4 box)
    {
        return box;
    }

    public static Vector4 GetRayBound(Vector4 ray)
    {
        Vector2 tr = ray.xy() + ray.zw();
        Vector4 bound = new Vector4();
        bound.x = (tr.x + ray.x) / 2;
        bound.y = (tr.y + ray.y) / 2;
        bound.z = Mathf.Max(Mathf.Abs(tr.x - ray.x), 1);
        bound.w = Mathf.Max(Mathf.Abs(tr.y - ray.y), 1);
        return bound;
    }

    public static Vector4 GetRaySegment(Vector4 ray)
    {
        Vector2 tr = ray.xy() + ray.zw();
        Vector4 seg = new Vector4();
        seg.x = ray.x;
        seg.y = ray.y;
        seg.z = tr.x;
        seg.w = tr.y;
        return seg;
    }

    public static Vector4 GetPointBound(Vector2 point)
    {
        Vector4 bound = new Vector4();
        bound.x = point.x;
        bound.y = point.y;
        bound.z = 1;
        bound.w = 1;
        return bound;
    }

    /// <summary>
    /// 把x,y,w,h的box转换为lowerx,higherx,lowery,highery
    /// </summary>
    /// <returns></returns>
    public static Vector4 GetBoxRange(Vector4 box)
    {
        Vector4 Range = new();
        Range.x = box.x - box.z / 2;
        Range.y = box.x + box.z / 2;
        Range.z = box.y - box.w / 2;
        Range.w = box.y + box.w / 2;
        return Range;
    }

    public ref readonly List<IQuadTreeObject> CircleCast(ColliderType target, Vector3 circle)
    {
        m_SharedCollideResults.Clear();
        var retriver = GetRetriverByType(target);
        if(retriver != null)
        {
            if (retriver(GetCircleBound(circle)))
            {
                for(int i = 0; i < m_SharedRetriveResults.Count; ++i)
                {
                    var collider = m_SharedRetriveResults[i];
                    if(collider != null)
                    {
                        if(collider is FastCircleCollider)
                        {
                            if(CircleVsCircle((collider as FastCircleCollider).circle, circle))
                            {
                                m_SharedCollideResults.Add(collider);
                            }
                        }
                        else if(collider is FastBoxCollider)
                        {
                            if (BoxVsCircle((collider as FastBoxCollider).box, circle))
                            {
                                m_SharedCollideResults.Add(collider);
                            }
                        }
                    }
                }
            }
        }
        return ref m_SharedCollideResults;
    }

    public ref readonly List<IQuadTreeObject> BoxCast(ColliderType target, Vector4 box)
    {
        m_SharedCollideResults.Clear();
        var retriver = GetRetriverByType(target);
        if (retriver != null)
        {
            if (retriver(GetBoxBound(box)))
            {
                for (int i = 0; i < m_SharedRetriveResults.Count; ++i)
                {
                    var collider = m_SharedRetriveResults[i];
                    if (collider != null)
                    {
                        if (collider is FastCircleCollider)
                        {
                            if (BoxVsCircle(box, (collider as FastCircleCollider).circle))
                            {
                                m_SharedCollideResults.Add(collider);
                            }
                        }
                        else if (collider is FastBoxCollider)
                        {
                            if (BoxVsBox(box, (collider as FastBoxCollider).box))
                            {
                                m_SharedCollideResults.Add(collider);
                            }
                        }
                    }
                }
            }
        }
        return ref m_SharedCollideResults;
    }

    /// <summary>
    /// x,y dir.x dir.y（dir带长度）
    /// </summary>
    /// <param name="target"></param>
    /// <param name="line"></param>
    /// <returns></returns>
    public ref readonly List<IQuadTreeObject> RayCast(ColliderType target, Vector4 ray)
    {
        m_SharedCollideResults.Clear();
        var retriver = GetRetriverByType(target);
        if(retriver != null)
        {
            if(retriver(GetRayBound(ray)))
            {
                for (int i = 0; i < m_SharedRetriveResults.Count; ++i)
                {
                    var collider = m_SharedRetriveResults[i];
                    if (collider != null)
                    {
                        if (collider is FastCircleCollider)
                        {
                            if (RayVsCircle(ray, (collider as FastCircleCollider).circle))
                            {
                                m_SharedCollideResults.Add(collider);
                            }
                        }
                        else if (collider is FastBoxCollider)
                        {
                            if (RayVsBox(ray, (collider as FastBoxCollider).box))
                            {
                                m_SharedCollideResults.Add(collider);
                            }
                        }
                    }
                }
            }
        }
        return ref m_SharedCollideResults;
    }

    public ref readonly List<IQuadTreeObject> PointCast(ColliderType target, Vector2 point)
    {
        return ref m_SharedCollideResults;
    }

}