using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Timers;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;

namespace Signal_Generator
{
    public class DrawTask : Task
    {
        Canvas currentCanvas;
        System.Timers.Timer taskTimer;
        Stopwatch stopwatch = new Stopwatch();
        MultiSignal currentMultiSignal;
        public DStatus dStatus;
        public enum DStatus
        {
            Created, Running, Paused, Finished, Canceled
        }

        public DrawTask(Action a) : base(a) { }

        public void buildTask(MultiSignal s, Canvas c)
        {
            currentCanvas = c;
            currentMultiSignal = s;
            dStatus = DStatus.Running;
            drawSignalAtCanvas();
            stopwatch.Start();
            taskTimer = new System.Timers.Timer(2000);
            taskTimer.Elapsed += updateTextForms;
            taskTimer.Enabled = true;
        }

        private void updateTextForms(object sender, ElapsedEventArgs e)
        {
            var elapsed = stopwatch.ElapsedMilliseconds;
        }

        private void drawSignalAtCanvas()
        {
            double lastX = 0, lastY = 0;
            double w = currentCanvas.ActualWidth;
            for (int i = 0; i != (int)w; i++)
            {
                double y = currentMultiSignal.currentAmplitude(i / 5.0);
                drawLine(lastX, lastY, i, y);
                lastX = i;
                lastY = y;
                Thread.Sleep(10);
                switch (dStatus)
                {
                    case DStatus.Paused:
                        while (dStatus == DStatus.Paused)
                            Thread.Sleep(10);
                        break;
                    case DStatus.Canceled: return;
                }
            }
            dStatus = DStatus.Finished;
        }

        private void drawLine(double x1, double y1, double x2, double y2)
        {
            Action a = () => {
                Line l = new Line();
                l.StrokeThickness = 1;
                l.Stroke = Brushes.Red;
                l.X1 = x1;
                l.Y1 = remap(y1);
                l.X2 = x2;
                l.Y2 = remap(y2);
                currentCanvas.Children.Add(l);
            };
            currentCanvas.Dispatcher.Invoke(a);
        }

        private double remap(double x, double oldMin = -100.0, double oldMax = 100.0, double newMin = 100.0, double newMax = 0.0)
        {
            newMin = currentCanvas.ActualHeight;
            return newMin + (x - oldMin) * (newMax - newMin) / (oldMax - oldMin);
        }
    }
}