using RealTimeGraphEx.Components.ComponentsItems;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;

namespace RealTimeGraphEx.Components
{
    public class YAxisScroll : ComponentBase
    {
        private Grid innerGrid;

        #region Properties

        public int Interval
        {
            get { return (int)GetValue(IntervalProperty); }
            set { SetValue(IntervalProperty, value); }
        }
        public static readonly DependencyProperty IntervalProperty =
            DependencyProperty.Register("Interval", typeof(int), typeof(YAxisScroll), new PropertyMetadata(4));

        public double VerticalOffset
        {
            get { return (double)GetValue(VerticalOffsetProperty); }
            set { SetValue(VerticalOffsetProperty, value); }
        }
        public static readonly DependencyProperty VerticalOffsetProperty =
            DependencyProperty.Register("VerticalOffset", typeof(double), typeof(YAxisScroll), new PropertyMetadata(0.0));

        public double HorizontalOffset
        {
            get { return (double)GetValue(HorizontalOffsetProperty); }
            set { SetValue(HorizontalOffsetProperty, value); }
        }
        public static readonly DependencyProperty HorizontalOffsetProperty =
            DependencyProperty.Register("HorizontalOffset", typeof(double), typeof(YAxisScroll), new PropertyMetadata(0.0));

        public DataTemplate LabelTemplate
        {
            get { return (DataTemplate)GetValue(LabelTemplateProperty); }
            set { SetValue(LabelTemplateProperty, value); }
        }
        public static readonly DependencyProperty LabelTemplateProperty =
            DependencyProperty.Register("LabelTemplate", typeof(DataTemplate), typeof(YAxisScroll), new PropertyMetadata(null));

        public ObservableCollection<YAxisLabel> Labels
        {
            get { return (ObservableCollection<YAxisLabel>)GetValue(LabelsProperty); }
            set { SetValue(LabelsProperty, value); }
        }
        public static readonly DependencyProperty LabelsProperty =
            DependencyProperty.Register("Labels", typeof(ObservableCollection<YAxisLabel>), typeof(YAxisScroll), new PropertyMetadata(null));

        public String StringFormat
        {
            get { return (String)GetValue(StringFormatProperty); }
            set { SetValue(StringFormatProperty, value); }
        }
        public static readonly DependencyProperty StringFormatProperty =
            DependencyProperty.Register("StringFormat", typeof(String), typeof(YAxisScroll), new PropertyMetadata("#0.0"));



        #endregion

        public YAxisScroll()
        {
            Labels = new ObservableCollection<YAxisLabel>();
            Location = ComponentLocationEnum.Left;
            this.SizeChanged += (x, y) => { Render(Graph); };
        }

        public override void Render(RealTimeGraphExBase graph, bool animate = false)
        {
            if (graph == null) return;

            if (Interval < 2) return;

            if (innerGrid == null)
            {
                innerGrid = new Grid();
            }

            var grid = innerGrid;

            double animationTime = animate ? 0.2 : 0;

            DoubleAnimation heightAnimation = new DoubleAnimation() { Duration = new Duration(TimeSpan.FromSeconds(animationTime)) };
            heightAnimation.To = double.IsNaN(Graph.gridLinesAndImageWrapperGrid.Height) ? Graph.gridLinesAndImageWrapperGrid.ActualHeight : Graph.gridLinesAndImageWrapperGrid.Height;

            if (!double.IsNaN(grid.Height))
            {
                grid.BeginAnimation(Grid.HeightProperty, heightAnimation);
            }
            else
            {
                grid.Height = Graph.gridLinesAndImageWrapperGrid.ActualHeight;
            }
            grid.VerticalAlignment = System.Windows.VerticalAlignment.Top;

            ThicknessAnimation marginAni = new ThicknessAnimation() { Duration = new Duration(TimeSpan.FromSeconds(animationTime)) };
            marginAni.To = new Thickness(0, Graph.gridLinesAndImageWrapperGrid.Margin.Top, 0, 0);

            if (!double.IsNaN(grid.Height))
            {
                grid.BeginAnimation(MarginProperty, marginAni);
            }
            else
            {
                grid.Margin = new Thickness(0, Graph.gridLinesAndImageWrapperGrid.Margin.Top, 0, 0);
            }

            double height = double.IsNaN(Graph.gridLinesAndImageWrapperGrid.Height) ? Graph.gridLinesAndImageWrapperGrid.ActualHeight : Graph.gridLinesAndImageWrapperGrid.Height;

            int interval = (int)Math.Round((Interval * (((height * 100) / Graph.gridMain.ActualHeight) / 100)), MidpointRounding.ToEven);

            this.Content = grid;
            this.ClipToBounds = true;

            grid.RowDefinitions.Clear();
            grid.Children.Clear();

            if (Labels != null && Labels.Count > 0)
            {
                for (int i = 0; i < Labels.Count - 1; i++)
                {
                    RowDefinition rowLabels = new RowDefinition();
                    rowLabels.Height = new GridLength(1, GridUnitType.Star);
                    grid.RowDefinitions.Add(rowLabels);
                    AddLabel(Labels[i], graph, grid, i, System.Windows.VerticalAlignment.Top);
                }

                AddLabel(Labels.Last(), graph, grid, interval - 1, System.Windows.VerticalAlignment.Bottom);
            }
            else
            {
                for (int i = 0; i < interval; i++)
                {
                    RowDefinition rowLabels = new RowDefinition();
                    rowLabels.Height = new GridLength(1, GridUnitType.Star);
                    grid.RowDefinitions.Add(rowLabels);
                }

                for (int i = 0; i < interval; i++)
                {
                    double value = graph.Maximum - (i * ((graph.Maximum - graph.Minimum) / interval));
                    AddLabel(value.ToString(StringFormat), graph, grid, i, System.Windows.VerticalAlignment.Top);
                }

                AddLabel(graph.Minimum.ToString(StringFormat), graph, grid, interval - 1, System.Windows.VerticalAlignment.Bottom);
            }

            grid.InvalidateArrange();
            grid.InvalidateMeasure();
            grid.UpdateLayout();
            grid.InvalidateVisual();
        }

        protected void AddLabel(Object content, RealTimeGraphExBase graph, Grid grid, int row, VerticalAlignment align)
        {
            //Add Labels
            YAxisLabel label = new YAxisLabel();
            label.HorizontalAlignment = System.Windows.HorizontalAlignment.Center;
            label.VerticalAlignment = align;
            label.Content = content;

            if (row > 0 || VerticalOffset > 0)
            {
                label.Margin = new Thickness(HorizontalOffset, VerticalOffset, 0, 0);
            }

            Grid.SetRow(label, row);
            grid.Children.Add(label);

            if (LabelTemplate != null)
            {
                label.ContentTemplate = LabelTemplate;
            }
        }

        protected override void OnGraphZoomComplete(Point transformOrigin, double scaleX, double scaleY)
        {
            Render(Graph, true);
        }

        protected override void OnGraphMinMaxChanged()
        {
            Render(Graph);
        }

        protected override void OnGraphPanningComplete(Point translate)
        {
            if (innerGrid != null)
            {
                var renderBounds = Graph.GetGraphRenderBounds();
                innerGrid.BeginAnimation(MarginProperty, null);
                innerGrid.Margin = new Thickness(0, Graph.gridLinesAndImageWrapperGrid.Margin.Top, 0, 0);
            }
        }
    }
}