namespace AntdWpf.Utils
{
    using System.Windows;

    public static class CornerRadiusUtil
    {
        /// <summary>
        /// 验证角半径是否只包含有效值
        /// 有效性检查集作为参数传递。
        /// </summary>
        /// <param name='corner'>CornerRadius value</param>
        /// <param name='allowNegative'>allows negative values</param>
        /// <param name='allowNaN'>allows Double.NaN</param>
        /// <param name='allowPositiveInfinity'>allows Double.PositiveInfinity</param>
        /// <param name='allowNegativeInfinity'>allows Double.NegativeInfinity</param>
        /// <returns>Whether or not the CornerRadius complies to the range specified</returns>
        public static bool IsValid(CornerRadius corner, bool allowNegative, bool allowNaN, bool allowPositiveInfinity, bool allowNegativeInfinity)
        {
            if (!allowNegative)
            {
                if (corner.TopLeft < 0d || corner.TopRight < 0d || corner.BottomLeft < 0d || corner.BottomRight < 0d)
                {
                    return false;
                }
            }

            if (!allowNaN)
            {
                if (DoubleUtil.IsNaN(corner.TopLeft) || DoubleUtil.IsNaN(corner.TopRight) ||
                    DoubleUtil.IsNaN(corner.BottomLeft) || DoubleUtil.IsNaN(corner.BottomRight))
                {
                    return false;
                }
            }

            if (!allowPositiveInfinity)
            {
                if (double.IsPositiveInfinity(corner.TopLeft) || double.IsPositiveInfinity(corner.TopRight) ||
                    double.IsPositiveInfinity(corner.BottomLeft) || double.IsPositiveInfinity(corner.BottomRight))
                {
                    return false;
                }
            }

            if (!allowNegativeInfinity)
            {
                if (double.IsNegativeInfinity(corner.TopLeft) || double.IsNegativeInfinity(corner.TopRight) ||
                    double.IsNegativeInfinity(corner.BottomLeft) || double.IsNegativeInfinity(corner.BottomRight))
                {
                    return false;
                }
            }

            return true;
        }

        /// <summary>
        /// Verifies if the CornerRadius contains only zero values
        /// </summary>
        /// <param name="corner">CornerRadius</param>
        /// <returns>Size</returns>
        public static bool IsZero(CornerRadius corner)
        {
            return DoubleUtil.IsZero(corner.TopLeft) && DoubleUtil.IsZero(corner.TopRight)
                    && DoubleUtil.IsZero(corner.BottomRight) && DoubleUtil.IsZero(corner.BottomLeft);
        }

        /// <summary>
        /// Verifies if the CornerRadius contains same values
        /// </summary>
        /// <param name="corner">CornerRadius</param>
        /// <returns>true if yes, otherwise false</returns>
        public static bool IsUniform(CornerRadius corner)
        {
            var topLeft = corner.TopLeft;
            return DoubleUtil.AreClose(topLeft, corner.TopRight)
                    && DoubleUtil.AreClose(topLeft, corner.BottomRight)
                    && DoubleUtil.AreClose(topLeft, corner.BottomLeft);
        }
    }
}