using StgSharp.Controlling;
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Text;

namespace StgSharp.Math
{
    public static unsafe partial class Scaler
    {

        internal static float currentSeed
#if DEBUG    
            = 0.5f;
#else
        = Calc.Abs(System.DateTime.UtcNow.GetHashCode());
#endif

        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static float Random()
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// returns a random float number between 0 and 1.
        /// </summary>
        /// <returns></returns>
        public static unsafe float LowProceisionRandom()
        {
            float seed = currentSeed;

            float sample = Scaler.Pow(Scaler.SeedSqrt(seed), 2);
            float sample2 = (sample - seed) / seed;
            sample2 = Scaler.Abs(sample2);

            if (sample == 1)
            {
                sample = sample2;
            }

            currentSeed = sample;
            sample2 *= 1000000;

            float result = sample2 - (int)sample2;
            if (result == 0)
            {
                currentSeed = sample2 + 0.1f;
                result = Scaler.LowProceisionRandom();
            }
            return result;

        }

        /// <summary>
        /// Generates a random seed in int value.
        /// </summary>
        /// <returns></returns>
        public static unsafe int RandomSeed()
        {
            float seedValue1 = LowProceisionRandom();
            float seedValue2 = LowProceisionRandom();
            uint seedValueBits = *(uint*)&seedValue1;

            float seedValue = seedValueBits * seedValue2;

            return *(int*)&seedValue;
        }
    }
}