using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Media;

namespace AiwazAnimator
{
    public class HistoricalFloat : FrameworkElement
    {
        private List<Func<float>> ObservableFloats;
        private Dictionary<Func<float>, List<float>> History;

        public HistoricalFloat()
        {
            ObservableFloats = new List<Func<float>>();
            History = new Dictionary<Func<float>, List<float>>();
        }

        public void Add(Func<float> ObservableFloat)
        {
            ObservableFloats.Add(ObservableFloat);
            History[ObservableFloat] = new List<float>();
        }

        public void Tick()
        {
            foreach (var f in ObservableFloats)
            {
                History[f].Add(f());
                while (History[f].Count > 128)
                    History[f].RemoveAt(0);
            }

            this.InvalidateVisual();
        }

        protected override void OnRender(DrawingContext dc)
        {
            base.OnRender(dc);

            SolidColorBrush b = new SolidColorBrush();
            b.Color = Colors.Black;
            Pen p = new Pen(Brushes.Green, 1);
            dc.DrawRectangle(b, p, new Rect(this.RenderSize));

            int y = 0;
            int height = 50;
            foreach (var f in ObservableFloats)
            {
                float x = 128 - History[f].Count;
                Point oldPoint = new Point(-1, -1);
                foreach (var val in History[f])
                {
                    float newVal = val;
                    if (newVal > 1)
                        newVal = 1;
                    if (newVal < 0)
                        newVal = 0;
                    Point newPoint = new Point((x * RenderSize.Width) / 128, y + 2 + height * (1.0f - newVal));
                    if (oldPoint.X != -1)
                        dc.DrawLine(p, oldPoint, newPoint);
                    x++;
                    oldPoint = newPoint;
                }
                y += height + 4;
            }
        }
    }
}