using System.Drawing;
using System.Numerics;

namespace WebmrAPI.Utils.Sequences
{
    public abstract class OscillationGenerator<T> : BaseGenerator<T>
    {
        private int _segments = 1;
        private double _amplitude = 100.0;
        public double Amplitude { get => _amplitude; protected set => _amplitude = Math.Abs(value); }
        public int Segments { get => _segments; protected set => _segments = value < 1 ? 1 : value; }
        public override double Step { get; protected set; }
        protected abstract double FOffset { get; }
        public OscillationGenerator(T min, T max)
            : base(min, max) { }
    }

    public abstract class SawtoothGenerator<T> : OscillationGenerator<T>
    {
        protected override double FOffset { get { double s = (Progress * Segments) % 1.0; return (s < 0.5 ? s : (1.0 - s)) * 4.0 - 1.0; } }

        public SawtoothGenerator(T min, T max)
            : base(min, max) { }
    }

    public abstract class SineWaveGenerator<T> : OscillationGenerator<T>
    {
        protected override double FOffset { get => Math.Sin(Progress * (Segments * 2.0) * Math.PI); }

        public SineWaveGenerator(T min, T max)
            : base(min, max) { }
    }

    public abstract class SquareWaveGenerator<T> : OscillationGenerator<T>
    {
        protected override double FOffset { get => (Math.Floor(Progress * Segments) % 2 == 0) ? 1 : -1; }

        public SquareWaveGenerator(T min, T max)
            : base(min, max) { }
    }
    public sealed class SawtoothNumberGenerator<T> : SawtoothGenerator<T>, INumberGenerator<T> where T : struct, INumber<T>
    {
        public INumberGenerator<T> Self { get => this; }
        public SawtoothNumberGenerator<T> SetShapeFactor(double fShape) { FShape = fShape; return this; }
        public SawtoothNumberGenerator<T> SetFadeFactor(double fade) { FFade = fade; return this; }
        public SawtoothNumberGenerator<T> SetSegments(int count) { Segments = count; return this; }
        public SawtoothNumberGenerator<T> SetAmplitude(double amplitude) { Amplitude = amplitude; return this; }
        protected override T Calc()
        {
            var offs = Amplitude * FOffset * Scale * ((Self.DMax - Self.DMin) / 2.0);

            return T.CreateChecked(Math.Clamp(Self.Mean + offs, Self.DMin, Self.DMax));
        }
        public SawtoothNumberGenerator(T min, T max, int count = 10) : base(min, max)
        {
            Step = CalcStepByCount(count);
            Amplitude = 1.0; // Set default
        }
    }
    public sealed class SineWaveNumberGenerator<T> : SineWaveGenerator<T>, INumberGenerator<T> where T : struct, INumber<T>
    {
        public INumberGenerator<T> Self { get => this; }
        public SineWaveNumberGenerator<T> SetShapeFactor(double fShape) { FShape = fShape; return this; }
        public SineWaveNumberGenerator<T> SetFadeFactor(double fade) { FFade = fade; return this; }
        public SineWaveNumberGenerator<T> SetSegments(int count) { Segments = count; return this; }
        public SineWaveNumberGenerator<T> SetAmplitude(double amplitude) { Amplitude = amplitude; return this; }
        protected override T Calc()
        {
            var offs = Amplitude * FOffset * Scale * ((Self.DMax - Self.DMin) / 2.0);

            return T.CreateChecked(Math.Clamp(Self.Mean + offs, Self.DMin, Self.DMax));
        }
        public SineWaveNumberGenerator(T min, T max, int count = 10) : base(min, max)
        {
            Step = CalcStepByCount(count);
            Amplitude = 1.0; // Set default
        }
    }
    public sealed class SquareWaveNumberGenerator<T> : SquareWaveGenerator<T>, INumberGenerator<T> where T : struct, INumber<T>
    {
        public INumberGenerator<T> Self { get => this; }
        public SquareWaveNumberGenerator<T> SetShapeFactor(double fShape) { FShape = fShape; return this; }
        public SquareWaveNumberGenerator<T> SetFadeFactor(double fade) { FFade = fade; return this; }
        public SquareWaveNumberGenerator<T> SetSegments(int count) { Segments = count; return this; }
        public SquareWaveNumberGenerator<T> SetAmplitude(double amplitude) { Amplitude = amplitude; return this; }
        protected override T Calc()
        {
            var offs = Amplitude * FOffset * Scale * ((Self.DMax - Self.DMin) / 2.0);

            return T.CreateChecked(Math.Clamp(Self.Mean + offs, Self.DMin, Self.DMax));
        }
        public SquareWaveNumberGenerator(T min, T max, int count = 10) : base(min, max)
        {
            Step = CalcStepByCount(count);
            Amplitude = 1.0; // Set default
        }
    }

    public sealed class SawtoothPointGenerator : SawtoothGenerator<Point>, IPointGenerator
    {
        private readonly double _pAngle;
        public IPointGenerator Self { get => this; }
        public SawtoothPointGenerator SetShapeFactor(double fShape) { FShape = fShape; return this; }
        public SawtoothPointGenerator SetFadeFactor(double fade) { FFade = fade; return this; }
        public SawtoothPointGenerator SetSegments(int count) { Segments = count; return this; }
        public SawtoothPointGenerator SetAmplitude(double amplitude) { Amplitude = amplitude; return this; }
        protected override Point Calc()
        {
            return IPointGenerator.CalcPoint(Self.LinearX, Self.LinearY, Amplitude * FOffset * Scale, _pAngle);
        }

        public static SawtoothPointGenerator CreateByCount(Point start, Point end, int count)
        {
            return new SawtoothPointGenerator(start, end) { Step = CalcStepByCount(count) };
        }

        public static SawtoothPointGenerator CreateByStepSize(Point start, Point end, double pxPerStep = 5)
        {
            return new SawtoothPointGenerator(start, end, pxPerStep);
        }

        public SawtoothPointGenerator(Point start, Point end, double pxPerStep = 5)
            : this(start, end)
        {
            Step = pxPerStep / IPointGenerator.CalcDistance(start, end);
        }

        private SawtoothPointGenerator(Point start, Point end)
            : base(start, end)
        {
            _pAngle = IPointGenerator.CalcAngle(start, end) + Math.PI / 2.0;
        }
    }

    public sealed class SineWavePointGenerator : SineWaveGenerator<Point>, IPointGenerator
    {
        private readonly double _pAngle;
        public IPointGenerator Self { get => this; }
        public SineWavePointGenerator SetShapeFactor(double fShape) { FShape = fShape; return this; }
        public SineWavePointGenerator SetFadeFactor(double fade) { FFade = fade; return this; }
        public SineWavePointGenerator SetSegments(int count) { Segments = count; return this; }
        public SineWavePointGenerator SetAmplitude(double amplitude) { Amplitude = amplitude; return this; }
        protected override Point Calc()
        {
            return IPointGenerator.CalcPoint(Self.LinearX, Self.LinearY, Amplitude * FOffset * Scale, _pAngle);
        }

        public static SineWavePointGenerator CreateByCount(Point start, Point end, int count)
        {
            return new SineWavePointGenerator(start, end) { Step = CalcStepByCount(count) };
        }

        public static SineWavePointGenerator CreateByStepSize(Point start, Point end, double pxPerStep = 5)
        {
            return new SineWavePointGenerator(start, end, pxPerStep);
        }

        public SineWavePointGenerator(Point start, Point end, double pxPerStep = 5)
            : this(start, end)
        {
            Step = pxPerStep / IPointGenerator.CalcDistance(start, end);
        }

        private SineWavePointGenerator(Point start, Point end)
            : base(start, end)
        {
            _pAngle = IPointGenerator.CalcAngle(start, end) + Math.PI / 2.0;
        }
    }

    public sealed class SquareWavePointGenerator : SquareWaveGenerator<Point>, IPointGenerator
    {
        private readonly double _pAngle;
        public IPointGenerator Self { get => this; }
        public SquareWavePointGenerator SetShapeFactor(double fShape) { FShape = fShape; return this; }
        public SquareWavePointGenerator SetFadeFactor(double fade) { FFade = fade; return this; }
        public SquareWavePointGenerator SetSegments(int count) { Segments = count; return this; }
        public SquareWavePointGenerator SetAmplitude(double amplitude) { Amplitude = amplitude; return this; }
        protected override Point Calc()
        {
            return IPointGenerator.CalcPoint(Self.LinearX, Self.LinearY, Amplitude * FOffset * Scale, _pAngle);
        }

        public static SquareWavePointGenerator CreateByCount(Point start, Point end, int count)
        {
            return new SquareWavePointGenerator(start, end) { Step = CalcStepByCount(count) };
        }

        public static SquareWavePointGenerator CreateByStepSize(Point start, Point end, double pxPerStep = 5)
        {
            return new SquareWavePointGenerator(start, end, pxPerStep);
        }

        public SquareWavePointGenerator(Point start, Point end, double pxPerStep = 5)
            : this(start, end)
        {
            Step = pxPerStep / IPointGenerator.CalcDistance(start, end);
        }

        private SquareWavePointGenerator(Point start, Point end)
            : base(start, end)
        {
            _pAngle = IPointGenerator.CalcAngle(start, end) + Math.PI / 2.0;
        }
    }
}