using AI.Common.Tools;
using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Text;

namespace AI.Reconstruction
{
    ///重要说明: 项目开发时使用的AI.Common（1.0.1.22）、AI.DiagSystem（1.0.1.31） 均为老版本
    ///现替换为正式发布的Release版AI.Common（1.0.1.31）、AI.DiagSystem（1.0.1.44），
    ///但与之前版本比较，缺少Point3DF、Point2DF等结构体定义，所以在此临时添加接口
    ///等添加接口后，仍需改为release版


    /// <summary>
    /// 2维点坐标
    /// 代替System.Drawing.Point
    /// </summary>
    [DataContract]
    [StructLayout(LayoutKind.Sequential)]
    public struct Point2DF : IEquatable<Point2DF>
    {
        private float _x;
        private float _y;

        /// <summary>
        /// X坐标
        /// </summary>
        [DataMember]
        public float X { get => _x; set => _x = value; }

        /// <summary>
        /// Y坐标
        /// </summary>
        [DataMember]
        public float Y { get => _y; set => _y = value; }

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        public Point2DF(float x, float y)
        {
            _x = x;
            _y = y;
        }

        /// <summary>
        /// 空的点
        /// </summary>
        public static readonly Point2DF Empty = new Point2DF(0, 0);

        /// <summary>
        /// 判断是否相等
        /// </summary>
        /// <param name="other"></param>
        /// <returns></returns>
        public bool Equals(Point2DF other)
        {
            return Equals(this, other);
        }

        /// <summary>
        /// 判断是否相等
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public override bool Equals(object obj)
        {
            if (obj == null || !(obj is Point2DF))
            {
                return false;
            }
            Point2DF point = (Point2DF)obj;
            return Equals(this, point);
        }

        /// <summary>
        /// 获得哈希值
        /// </summary>
        /// <returns></returns>
        public override int GetHashCode()
        {
            return string.Format("{0}-{1}", _x, _y).GetHashCode();
        }

        /// <summary>
        /// 转成字符串
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return SerializeDeserializeHelper.SerializeToJsonString(this);
        }

        /// <summary>
        /// 从字符串中重建
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static Point2DF FromString(string str)
        {
            return SerializeDeserializeHelper.DeserializeJsonResult<Point2DF>(str);
        }

        /// <summary>
        /// 转为bytes
        /// </summary>
        /// <returns></returns>
        public byte[] ToBytes()
        {
            byte[] result;
            using (var stream = new MemoryStream())
            {
                var writer = new AIStreamWriter(stream);
                writer.WriteFloat(_x);
                writer.WriteFloat(_y);
                result = stream.ToArray();
            }
            return result;
        }

        /// <summary>
        /// 从bytes里重建
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static Point2DF FromBytes(byte[] bytes)
        {
            Point2DF result;
            using (var stream = new MemoryStream(bytes))
            {
                stream.Position = 0;
                var reader = new AIStreamReader(stream);
                var x = reader.ReadFloat();
                var y = reader.ReadFloat();
                result = new Point2DF(x, y);
            }
            return result;
        }

        public static bool Equals(Point2DF one, Point2DF other)
        {
            return one.X == other.X && one.Y == other.Y;
        }

        public static bool operator ==(Point2DF left, Point2DF right)
        {
            return Equals(left, right);
        }

        public static bool operator !=(Point2DF left, Point2DF right)
        {
            return !Equals(left, right);
        }

        /// <summary>
        /// 计算两点之间的距离
        /// </summary>
        /// <param name="one"></param>
        /// <param name="other"></param>
        /// <returns></returns>
        public static float Distance(Point2DF one, Point2DF other)
        {
            return (float)Math.Sqrt(Math.Pow(one.X - other.X, 2) + Math.Pow(one.Y - other.Y, 2));
        }

        /// <summary>
        /// 求两点之间的中点
        /// </summary>
        /// <param name="one"></param>
        /// <param name="other"></param>
        /// <returns></returns>
        public static Point2DF MidPoint(Point2DF one, Point2DF other)
        {
            return new Point2DF((one.X + other.X) / 2, (one.Y + other.Y) / 2);
        }

    }

    /// <summary>
    /// 3维点坐标
    /// </summary>
    [DataContract]
    [StructLayout(LayoutKind.Sequential)]
    public struct Point3DF : IEquatable<Point3DF>
    {
        private float _x;
        private float _y;
        private float _z;

        /// <summary>
        /// X坐标
        /// </summary>
        [DataMember]
        public float X { get => _x; set => _x = value; }

        /// <summary>
        /// Y坐标
        /// </summary>
        [DataMember]
        public float Y { get => _y; set => _y = value; }

        /// <summary>
        /// Z坐标
        /// </summary>
        [DataMember]
        public float Z { get => _z; set => _z = value; }

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="x"></param>
        /// <param name="y"></param>
        /// <param name="z"></param>
        public Point3DF(float x, float y, float z)
        {
            _x = x;
            _y = y;
            _z = z;
        }

        /// <summary>
        /// 空的点
        /// </summary>
        public static readonly Point3DF Empty = new Point3DF(0, 0, 0);

        /// <summary>
        /// 判断是否相等
        /// </summary>
        /// <param name="other"></param>
        /// <returns></returns>
        public bool Equals(Point3DF other)
        {
            return Equals(this, other);
        }

        /// <summary>
        /// 判断是否相等
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public override bool Equals(object obj)
        {
            if (obj == null || !(obj is Point3DF))
            {
                return false;
            }
            Point3DF point = (Point3DF)obj;
            return Equals(this, point);
        }

        /// <summary>
        /// 获取哈希值
        /// </summary>
        /// <returns></returns>
        public override int GetHashCode()
        {
            return string.Format("{0}-{1}-{2}", _x, _y, _z).GetHashCode();
        }

        /// <summary>
        /// 转成字符串
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return SerializeDeserializeHelper.SerializeToJsonString(this);
        }

        /// <summary>
        /// 从字符串中生成
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public Point3DF FromString(string str)
        {
            return SerializeDeserializeHelper.DeserializeJsonResult<Point3DF>(str);
        }

        /// <summary>
        /// 转为bytes
        /// </summary>
        /// <returns></returns>
        public byte[] ToBytes()
        {
            byte[] result;
            using (var stream = new MemoryStream())
            {
                var writer = new AIStreamWriter(stream);
                writer.WriteFloat(_x);
                writer.WriteFloat(_y);
                writer.WriteFloat(_z);
                result = stream.ToArray();
            }
            return result;
        }

        /// <summary>
        /// 从bytes里重建
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static Point3DF FromBytes(byte[] bytes)
        {
            Point3DF result;
            using (var stream = new MemoryStream(bytes))
            {
                stream.Position = 0;
                var reader = new AIStreamReader(stream);
                var x = reader.ReadFloat();
                var y = reader.ReadFloat();
                var z = reader.ReadFloat();
                result = new Point3DF(x, y, z);
            }
            return result;
        }

        public static bool Equals(Point3DF one, Point3DF other)
        {
            return one.X == other.X && one.Y == other.Y && one.Z == other.Z;
        }

        public static bool operator ==(Point3DF left, Point3DF right)
        {
            return Equals(left, right);
        }

        public static bool operator !=(Point3DF left, Point3DF right)
        {
            return !Equals(left, right);
        }

        public static float Distance(Point3DF one, Point3DF other)
        {
            return (float)Math.Sqrt(Math.Pow(one.X - other.X, 2) + Math.Pow(one.Y - other.Y, 2) + Math.Pow(one.Z - other.Z, 2));
        }

    }

    /// <summary>
    /// 矩形框
    /// 代替System.Drawing.Rectangle
    /// </summary>
    [DataContract]
    public struct RectF : IEquatable<RectF>
    {
        private float _left;
        private float _top;
        private float _right;
        private float _bottom;
        private float _width;
        private float _height;

        /// <summary>
        /// 面积
        /// </summary>
        public float Area
        {
            get => _width * _height;
        }

        /// <summary>
        /// 右
        /// </summary>
        public float Right { get => _right; }

        /// <summary>
        /// 下
        /// </summary>
        public float Bottom { get => _bottom; }

        /// <summary>
        /// 左
        /// </summary>
        [DataMember]
        public float Left
        {
            get => _left;
            set { _left = value; _right = _left + _width; }
        }

        /// <summary>
        /// 上
        /// </summary>
        [DataMember]
        public float Top
        {
            get => _top;
            set { _top = value; _bottom = _top + _height; }
        }

        /// <summary>
        /// 宽度
        /// </summary>
        [DataMember]
        public float Width
        {
            get => _width;
            set
            {
                if (value < 0)
                {
                    throw new ArgumentException("width", "Width should be greater than 0.");
                };
                _width = value;
                _right = _left + _width;
            }
        }

        /// <summary>
        /// 高度
        /// </summary>
        [DataMember]
        public float Height
        {
            get => _height;
            set
            {
                if (value < 0)
                {
                    throw new ArgumentException("height", "Height should be greater than 0");
                };
                _height = value;
                _bottom = _top + _height;
            }
        }

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="left"></param>
        /// <param name="top"></param>
        /// <param name="width"></param>
        /// <param name="height"></param>
        public RectF(float left, float top, float width, float height)
        {
            if (width < 0)
            {
                throw new ArgumentException("width", "Width should be greater than 0.");
            }
            if (height < 0)
            {
                throw new ArgumentException("height", "Height should be greater than 0");
            }
            _left = left;
            _top = top;
            _width = width;
            _height = height;
            _right = left + width;
            _bottom = top + height;
        }

        /// <summary>
        /// 判断是否为未被初始化的Rect结构
        /// </summary>
        /// <returns></returns>
        public bool IsEmpty()
        {
            return Equals(this, Empty);
        }

        /// <summary>
        /// 空矩形框
        /// </summary>
        public static readonly RectF Empty = new RectF(0, 0, 0, 0);

        /// <summary>
        /// 判断是否相等
        /// </summary>
        /// <param name="rect"></param>
        /// <returns></returns>
        public bool Equals(RectF rect)
        {
            return Equals(this, rect);
        }

        /// <summary>
        /// 判断是否相等
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public override bool Equals(object obj)
        {
            if (obj == null || !(obj is RectF))
            {
                return false;
            }
            RectF point = (RectF)obj;
            return Equals(this, point);
        }

        /// <summary>
        /// 获得哈希值
        /// </summary>
        /// <returns></returns>
        public override int GetHashCode()
        {
            return string.Format("{0}-{1}-{2}-{3}", _left, _right, _width, _height).GetHashCode();
        }

        /// <summary>
        /// 转成字符串
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return SerializeDeserializeHelper.SerializeToJsonString(this);
        }

        /// <summary>
        /// 从字符串中生成
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static RectF FromString(string str)
        {
            return SerializeDeserializeHelper.DeserializeJsonResult<RectF>(str);
        }

        /// <summary>
        /// 转为bytes
        /// </summary>
        /// <returns></returns>
        public byte[] ToBytes()
        {
            byte[] result;
            using (var stream = new MemoryStream())
            {
                var writer = new AIStreamWriter(stream);
                writer.WriteFloat(_left);
                writer.WriteFloat(_top);
                writer.WriteFloat(_width);
                writer.WriteFloat(_height);
                result = stream.ToArray();
            }
            return result;
        }

        /// <summary>
        /// 从bytes里重建
        /// </summary>
        /// <param name="bytes"></param>
        /// <returns></returns>
        public static RectF FromBytes(byte[] bytes)
        {
            RectF result;
            using (var stream = new MemoryStream(bytes))
            {
                stream.Position = 0;
                var reader = new AIStreamReader(stream);
                var left = reader.ReadFloat();
                var top = reader.ReadFloat();
                var width = reader.ReadFloat();
                var height = reader.ReadFloat();
                result = new RectF(left, top, width, height);
            }
            return result;
        }

        public static bool Equals(RectF one, RectF other)
        {
            return one.Left == other.Left && one.Top == other.Top && one.Width == other.Width && one.Height == other.Height;
        }

        public static bool operator ==(RectF left, RectF right)
        {
            return Equals(left, right);
        }

        public static bool operator !=(RectF left, RectF right)
        {
            return !Equals(left, right);
        }


        /// <summary>
        /// 在原来的rect的基础上，上下左右一起偏移指定像素数
        /// 当offset为正时，为一起向正方向偏移（向右或向下）
        /// 当offset为负时，为一起向负方向偏移（向左或向上）
        /// </summary>
        /// <param name="offsetX"></param>
        /// <param name="offsetY"></param>
        /// <returns></returns>
        public static RectF Offset(RectF rect, float offsetX, float offsetY)
        {
            return new RectF(rect.Left + offsetX, rect.Top + offsetY, rect.Width, rect.Height);
        }

        /// <summary>
        /// 以原来的rect中心为中心，上下左右一起向外扩张或内缩指定像素数
        /// 当offset为正时，为外扩，当offset为负时，为内缩
        /// </summary>
        /// <param name="rect"></param>
        /// <param name="offset"></param>
        /// <returns></returns>
        public static RectF AdjustRect(RectF rect, float offsetX, float offsetY)
        {
            // 往内缩时，不能缩成负的了
            if (offsetX < -rect.Width / 2)
            {
                offsetX = -rect.Width / 2;
            }
            if (offsetY < -rect.Height / 2)
            {
                offsetY = -rect.Height / 2;
            }
            var correctedLeft = rect.Left - offsetX;
            var correctedRight = rect.Right + offsetX;
            var correctedTop = rect.Top - offsetY;
            var correctedBottom = rect.Bottom + offsetY;
            var correctedWidth = correctedRight - correctedLeft;
            var correctedHeight = correctedBottom - correctedTop;
            return new RectF(correctedLeft, correctedTop, correctedWidth, correctedHeight);
        }

        /// <summary>
        /// 以clipBound为边界，截断当前rect
        /// 即，左上右下角，改为不超过clipBound所限定的范围
        /// </summary>
        /// <param name="rect"></param>
        /// <param name="clipBound"></param>
        /// <returns></returns>
        public static RectF Clip(RectF rect, RectF clipBound)
        {
            var left = Math.Min(Math.Max(rect.Left, clipBound.Left), clipBound.Right);
            var right = Math.Min(Math.Max(rect.Right, clipBound.Left), clipBound.Right);
            var top = Math.Min(Math.Max(rect.Top, clipBound.Top), clipBound.Bottom);
            var bottom = Math.Min(Math.Max(rect.Bottom, clipBound.Top), clipBound.Bottom);
            var width = right - left;
            var height = bottom - top;
            return new RectF(left, top, width, height);
        }

        /// <summary>
        /// 计算两个rect的相交部分
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static RectF Intersection(RectF a, RectF b)
        {
            var left = Math.Max(a.Left, b.Left);
            var top = Math.Max(a.Top, b.Top);
            var right = Math.Min(a.Right, b.Right);
            var bottom = Math.Min(a.Bottom, b.Bottom);
            if (left > right || top > bottom)
            {
                return RectF.Empty;
            }
            var width = right - left;
            var height = bottom - top;
            return new RectF(left, top, width, height);
        }

        /// <summary>
        /// 计算两个rect的并集
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static RectF Union(RectF a, RectF b)
        {
            var left = Math.Min(a.Left, b.Left);
            var top = Math.Min(a.Top, b.Top);
            var right = Math.Max(a.Right, b.Right);
            var bottom = Math.Max(a.Bottom, b.Bottom);
            var width = right - left;
            var height = bottom - top;
            return new RectF(left, top, width, height);
        }

        /// <summary>
        /// 计算两个rect的IOU
        /// 注意：计算IOU时，分子是a和b的交集的面积（= Intersect(a,b).Area）
        /// 分母是a和b的并集的面积（≠Union(a,b).Area，而应该是a.Area+b.Area-Intersection(a,b).Area）
        /// </summary>
        /// <param name="a"></param>
        /// <param name="b"></param>
        /// <returns></returns>
        public static float CalcIOU(RectF a, RectF b)
        {
            var intersection = Intersection(a, b);
            var areaInter = intersection.Area;
            var areaUnion = a.Area + b.Area - areaInter;
            if (areaUnion <= 0)
            {
                return 0;
            }
            else
            {
                return areaInter * 1.0f / areaUnion;
            }
        }

    }
}