using UnityEngine;
using System;


public class MathUtility
{

    public static Vector3 Rotate90_XZ_CW(Vector3 vector)
    {
        Vector3 _vec = new Vector3(vector.z, vector.y, -vector.x);
        return _vec;
    }

    public static Vector3 Rotate90_XZ_CCW(Vector3 vector)
    {
        Vector3 _vec = new Vector3(-vector.z, vector.y, vector.x);
        return _vec;
    }

    public static Vector3 Rotate180_XZ(Vector3 vector)
    {
        Vector3 _vec = new Vector3(-vector.x, vector.y, -vector.z);
        return _vec;
    }

    /// <summary>
    /// 返回手势方向
    /// </summary>
    /// <param name="_start"></param>
    /// <param name="_end"></param>
    /// <returns></returns>
    static public GestureType GetGestureDirection(Vector2 _start, Vector2 _end)
    {
        GestureType gesture;

        var direction = _end - _start;
        var x = direction.x;
        var y = direction.y;

        if (y < x && y > -x)
        {
            gesture = GestureType.Right;
        }
        else if (y > x && y < -x)
        {
            gesture = GestureType.Left;
        }
        else if (y > x && y > -x)
        {
            gesture = GestureType.Up;
        }
        else
        {
            gesture = GestureType.Down;
        }

        return gesture;
    }

    // public static float FreeFall(float _startY, float _time)
    // {

    //     float deltaY = 0.5f * Constants.GRAVITY_RATE * Mathf.Pow(_time, 2f);

    //     return _startY - deltaY;
    // }

    public static float CalculateRefrenceScale(Vector2 _designWH)
    {
        var width = _designWH.x;
        var height = _designWH.y;
        var refrenceHeight = 0f;

        if (Screen.height / (float)Screen.width > height / (float)width)
        {
            refrenceHeight = (float)width / Screen.width * Screen.height;
        }
        else
        {
            refrenceHeight = height;
        }

        var scale = refrenceHeight / height;

        return scale;
    }

    public static float CalDistance(Vector3 srcPos, Vector3 desPos)
    {
        return (srcPos.x - desPos.x) * (srcPos.x - desPos.x) + (srcPos.z - desPos.z) * (srcPos.z - desPos.z);
    }

    /// <summary>
    /// 返回Int数据中某一位是否为1
    /// </summary>
    /// <param name="value"></param>
    /// <param name="index">32位数据的从右向左的偏移位索引(0~31)</param>
    /// <returns>true表示该位为1，false表示该位为0</returns>
    public static bool GetBitValue(uint value, ushort index)
    {
        if (index > 31)
        {
            throw new ArgumentOutOfRangeException("index"); //索引出错
        }

        var val = 1 << index;
        return (value & val) == val;
    }

    /// <summary>
    /// 设定Int数据中某一位的值
    /// </summary>
    /// <param name="value">位设定前的值</param>
    /// <param name="index">32位数据的从右向左的偏移位索引(0~31)</param>
    /// <param name="bitValue">true设该位为1,false设为0</param>
    /// <returns>返回位设定后的值</returns>
    public static int SetBitValue(int value, ushort index, bool bitValue)
    {
        if (index > 31)
        {
            throw new ArgumentOutOfRangeException("index"); //索引出错
        }

        var val = 1 << index;
        return bitValue ? (value | val) : (value & ~val);
    }

    public static bool IsPointInsideRectangel(Vector3 point, Vector3 rectStart, Vector3 rectEnd)
    {
        return point.x > rectStart.x && point.x < rectEnd.x && point.z > rectStart.z && point.z < rectEnd.z;
    }

    /// <summary>
    /// 返回角度代表的四元素
    /// </summary>
    /// <param name="angle"></param>
    /// <returns></returns>
    public static Quaternion GetClientRotationFromAngle(int angle)
    {
        float _angle = Mathf.Clamp(1.40625f * angle, 0f, 359f);
        return Quaternion.Euler(0, _angle, 0);
    }

    public static float DistanceSqrtXZ(Vector3 p1, Vector3 p2)
    {
        p1.y = 0;
        p2.y = 0;
        return Vector3.SqrMagnitude(p2 - p1);
    }

    public static Vector3 ForwardXZ(Vector3 target, Vector3 self)
    {
        target.y = 0;
        self.y = 0;
        return (target - self).normalized;
    }

    public static bool IsSameDir(Vector3 vec1, Vector3 vec2)
    {
        vec1.y = 0;
        vec2.y = 0;

        return Vector3.Dot(vec1, vec2) > 0;
    }

    public static bool OppositeDir(Vector3 vec1, Vector3 vec2)
    {
        vec1.y = 0;
        vec2.y = 0;

        return Vector3.Dot(vec1, vec2) < 0;
    }
    public static int Power(int a, int e)
    {
        int value = 1;
        for (int i = 0; i < e; i++)
        {
            value *= a;
        }

        return value;
    }

    public static bool CheckAdult(string _IDNumber)
    {
        if (string.IsNullOrEmpty(_IDNumber))
        {
            return false;
        }

        if (_IDNumber.Length == 15)
        {
            return true;
        }
        else if (_IDNumber.Length == 18)
        {
            var year = int.Parse(_IDNumber.Substring(6, 4));
            var month = int.Parse(_IDNumber.Substring(10, 2));
            var day = int.Parse(_IDNumber.Substring(12, 2));
            var borth = new DateTime(year, month, day);

            return (DateTime.Now - borth).TotalDays >= (365 * 18 + 4);
        }
        else
        {
            return true;
        }
    }

    public static float GetFloatFromLitJson(LitJson.JsonData j)
    {
        if (j.IsDouble)
        {
            return (float)(double)j;
        }
        else if (j.IsInt)
        {
            return (float)(int)j;
        }
        return 0f;
    }

    public static float GetQuatLength(Quaternion q)
	{
		return Mathf.Sqrt(q.x * q.x + q.y * q.y + q.z * q.z + q.w * q.w);
	}

	public static Quaternion GetQuatConjugate(Quaternion q)
	{
		return new Quaternion(-q.x, -q.y, -q.z, q.w);
	}

	/// <summary>
	/// Logarithm of a unit quaternion. The result is not necessary a unit quaternion.
	/// </summary>
	public static Quaternion GetQuatLog(Quaternion q)
	{
		Quaternion res = q;
		res.w = 0;

		if (Mathf.Abs(q.w) < 1.0f)
		{
			float theta = Mathf.Acos(q.w);
			float sin_theta = Mathf.Sin(theta);

			if (Mathf.Abs(sin_theta) > 0.0001)
			{
				float coef = theta / sin_theta;
				res.x = q.x * coef;
				res.y = q.y * coef;
				res.z = q.z * coef;
			}
		}

		return res;
	}

	public static Quaternion GetQuatExp(Quaternion q)
	{
		Quaternion res = q;

		float fAngle = Mathf.Sqrt(q.x * q.x + q.y * q.y + q.z * q.z);
		float fSin = Mathf.Sin(fAngle);

		res.w = Mathf.Cos(fAngle);

		if (Mathf.Abs(fSin) > 0.0001)
		{
			float coef = fSin / fAngle;
			res.x = coef * q.x;
			res.y = coef * q.y;
			res.z = coef * q.z;
		}

		return res;
	}

	/// <summary>
	/// SQUAD Spherical Quadrangle interpolation [Shoe87]
	/// </summary>
	public static Quaternion GetQuatSquad(float t, Quaternion q0, Quaternion q1, Quaternion a0, Quaternion a1)
	{
		float slerpT = 2.0f * t * (1.0f - t);

		Quaternion slerpP = Slerp(q0, q1, t);
		Quaternion slerpQ = Slerp(a0, a1, t);

		return Slerp(slerpP, slerpQ, slerpT);
	}

	public static Quaternion GetSquadIntermediate(Quaternion q0, Quaternion q1, Quaternion q2)
	{
		Quaternion q1Inv = GetQuatConjugate(q1);
		Quaternion p0 = GetQuatLog(q1Inv * q0);
		Quaternion p2 = GetQuatLog(q1Inv * q2);
		Quaternion sum = new Quaternion(-0.25f * (p0.x + p2.x), -0.25f * (p0.y + p2.y), -0.25f * (p0.z + p2.z), -0.25f * (p0.w + p2.w));

		return q1 * GetQuatExp(sum);
	}

	/// <summary>
	/// Smooths the input parameter t.
	/// If less than k1 ir greater than k2, it uses a sin.
	/// Between k1 and k2 it uses linear interp.
	/// </summary>
	public static float Ease(float t, float k1, float k2)
	{
		float f; float s;

		f = k1 * 2 / Mathf.PI + k2 - k1 + (1.0f - k2) * 2 / Mathf.PI;

		if (t < k1)
		{
			s = k1 * (2 / Mathf.PI) * (Mathf.Sin((t / k1) * Mathf.PI / 2 - Mathf.PI / 2) + 1);
		}
		else
			if (t < k2)
			{
				s = (2 * k1 / Mathf.PI + t - k1);
			}
			else
			{
				s = 2 * k1 / Mathf.PI + k2 - k1 + ((1 - k2) * (2 / Mathf.PI)) * Mathf.Sin(((t - k2) / (1.0f - k2)) * Mathf.PI / 2);
			}

		return (s / f);
	}

	/// <summary>
	/// We need this because Quaternion.Slerp always uses the shortest arc.
	/// </summary>
	public static Quaternion Slerp(Quaternion p, Quaternion q, float t)
	{
		Quaternion ret;

		float fCos = Quaternion.Dot(p, q);

		if ((1.0f + fCos) > 0.00001)
		{
			float fCoeff0, fCoeff1;

			if ((1.0f - fCos) > 0.00001)
			{
				float omega = Mathf.Acos(fCos);
				float invSin = 1.0f / Mathf.Sin(omega);
				fCoeff0 = Mathf.Sin((1.0f - t) * omega) * invSin;
				fCoeff1 = Mathf.Sin(t * omega) * invSin;
			}
			else
			{
				fCoeff0 = 1.0f - t;
				fCoeff1 = t;
			}

			ret.x = fCoeff0 * p.x + fCoeff1 * q.x;
			ret.y = fCoeff0 * p.y + fCoeff1 * q.y;
			ret.z = fCoeff0 * p.z + fCoeff1 * q.z;
			ret.w = fCoeff0 * p.w + fCoeff1 * q.w;
		}
		else
		{
			float fCoeff0 = Mathf.Sin((1.0f - t) * Mathf.PI * 0.5f);
			float fCoeff1 = Mathf.Sin(t * Mathf.PI * 0.5f);

			ret.x = fCoeff0 * p.x - fCoeff1 * p.y;
			ret.y = fCoeff0 * p.y + fCoeff1 * p.x;
			ret.z = fCoeff0 * p.z - fCoeff1 * p.w;
			ret.w = p.z;
		}

		return ret;
	}
    #region 进制转换
    private static char[] symbolsArray = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '+', '/' };
    static string symbolStr = new string(symbolsArray, 0, 64);
    /// <summary>
    /// 讲字符串由64进制转为10进制，前缀没用的可用字符-代替
    /// </summary>
    /// <param name="val"></param>
    /// <returns></returns>
    public static int Convert64To10(string val)
    {
        val=val.Trim('-');
        int result = 0;
        long longResult = 0;
        val = val.Trim();
        if (string.IsNullOrEmpty(val)) {
            return result;
        }
        if (val.Equals("0")) return 0;
        for (int i = 0; i < val.Length; i++) {
            if(!symbolStr.Contains(val[i].ToString())) {
                //DesignDebug.LogError(string.Format("64进制格式错误{0}", val));
                return 0;
            }
            else {
                try {
                    int index = 0;
                    for (int j = 0; j < symbolsArray.Length; j++) {
                        if (symbolsArray[j] == val[val.Length - i - 1]) {
                            index = j;
                        }
                    }
                    longResult += (long)System.Math.Pow(64, i) * index;
                    if(longResult>int.MaxValue) {
                        Debug.LogError("超出Int最大值，尝试转换为long类型");
                        return 0;
                    }
                    result = (int)longResult;
                }
                catch {
                    Debug.LogError("运算溢出");
                    return 0;
                }
            }
        }
        return result;
    }
    static char[] outSymbol = new char[65];
    /// <summary>
    /// 将10进制转为64进制的字符串
    /// </summary>
    /// <param name="val"></param>
    /// <returns></returns>
    public static string Convert10To64(int val)
    {
        if (0 == val) return "0";
        int index = 0;
        long longPositive = Mathf.Abs(val);
        for (index = 0; index <= 64; index++) {
            if (longPositive == 0) break;
            outSymbol[outSymbol.Length - index - 1] = symbolsArray[longPositive % 64];
            longPositive /= 64;
        }
        return new string(outSymbol,outSymbol.Length-index,index);
    }
    #endregion
}