using KLHZ.Trader.Core.Math.Declisions.Utils;
using MathNet.Numerics;
using MathNet.Numerics.IntegralTransforms;
using System.Security.Cryptography;

namespace KLHZ.Trader.Core.Tests
{
    public class FFTTests
    {
        [Test]
        public static void Test()
        {
            var da = new List<float>();
            for (int i = 0; i < 100; i++)
            {
                da.Add((float)System.Math.Sin(0.5 * i)+(float)System.Math.Cos(0.5 * i));
            }

            var start = da.ToArray();
            var arrv = da.Select(d => new Complex32(d, 0)).ToArray();
            Fourier.Forward(arrv);
            var tem = arrv.Select(a => Complex32.Abs(a)).ToArray();
            var s = tem.Sum();
            Fourier.Inverse(arrv);
            var res = arrv.Select(a => a.Real).ToArray();

            for (int i = 0; i < 1000; i++)
            {
                var d = res[i] - start[i];
            }
        }

        [Test]
        public static void CalcHarmonyPeriodTest1()
        {
            var period1 = FFT.CaclHarmonycPeriod(TimeSpan.FromHours(1), 1000, 1);
            var period2 = FFT.CaclHarmonycPeriod(TimeSpan.FromHours(1), 1000, 2);
            var period3 = FFT.CaclHarmonycPeriod(TimeSpan.FromHours(1), 1000, 3);
            var period4 = FFT.CaclHarmonycPeriod(TimeSpan.FromHours(1), 1000, 4);
        }


        [Test]
        public static void CalcPhaseRange()
        {
            var res = FFT.CalcPhaseRange(1, 0, 0, 0.001);
            Assert.IsTrue(res.min < System.Math.PI / 2);
            Assert.IsTrue(res.min > System.Math.PI / 2 * 0.9);
            Assert.IsTrue(res.max > System.Math.PI / 2);
            Assert.IsTrue(res.max < System.Math.PI / 2 * 1.1);
        }
    }
}