using System;
using System.Collections.Generic;

namespace Shapes
{
    public class Validator
    {
        public static void ValidateDouble(double value, string errorMessage)
        {
            if (double.IsInfinity(value) || double.IsNaN(value))
                throw new ShapeException(errorMessage);
        }

        public static void ValidatePositiveDouble(double value, string errorMessage)
        {
            ValidateDouble(value, errorMessage);
            if (value < 0)
                throw new ShapeException(errorMessage);
        }

        public static void ValidateRectangle(List<Point> points, string errorMessage)
        {
            var pointList = new List<Point>(points);

            var TOLERANCE = double.Epsilon + double.Epsilon;
            var plumLine1 = new Line(points[0], points[2]);
            var plumLine2 = new Line(points[1], points[3]);
            var heightLine1 = new Line(points[0], points[3]);
            var heightLine2 = new Line(points[1], points[2]);
            var lengthLine1 = new Line(points[0], points[1]);
            var lengthLine2 = new Line(points[3], points[2]);
            if (Math.Abs(plumLine1.ComputeLength() - plumLine2.ComputeLength()) > TOLERANCE
                || Math.Abs(heightLine1.ComputeLength() - heightLine2.ComputeLength()) > TOLERANCE
                || Math.Abs(lengthLine1.ComputeLength() - lengthLine2.ComputeLength()) > TOLERANCE)
                throw new ShapeException(errorMessage);

//            while (pointList.Count > 0)
//            {
//                var tmp = pointList[0];
//                pointList.Remove(tmp);
//                if (pointList.Contains(tmp)) throw new ShapeException(errorMessage);
//            }

            while (pointList.Count > 0)
            {
                var tmp = pointList[0];
                pointList.Remove(tmp);
                foreach (var point in pointList)
                {
                    if (point.X.Equals(tmp.X) && point.Y.Equals(tmp.Y))
                        throw new ShapeException(errorMessage);
                }

                //if (pointList.Contains(tmp)) throw new ShapeException(errorMessage);
            }
        }
    }
}