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

namespace Tango.Visuals
{
    /// <summary>
    /// Interaction logic for YAxisDoubles.xaml
    /// </summary>
    public partial class YAxisDoubles : UserControl
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="YAxisDoubles"/> class.
        /// </summary>
        public YAxisDoubles()
        {
            InitializeComponent();
            this.FocusVisualStyle = null;
            this.Focusable = false;
            this.Loaded += YAxisDoubles_Loaded;
        }

        /// <summary>
        /// Handles the Loaded event of the YAxisDoubles control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
        private void YAxisDoubles_Loaded(object sender, RoutedEventArgs e)
        {
            DrawTicks();
        }

        /// <summary>
        /// Gets or sets the number of ticks.
        /// </summary>
        public int Ticks
        {
            get { return (int)GetValue(TicksProperty); }
            set { SetValue(TicksProperty, value); }
        }
        public static readonly DependencyProperty TicksProperty =
            DependencyProperty.Register("Ticks", typeof(int), typeof(YAxisDoubles), new PropertyMetadata(8, (d, e) => (d as YAxisDoubles).DrawTicks()));

        /// <summary>
        /// Gets or sets the minimum value.
        /// </summary>
        public double Minimum
        {
            get { return (double)GetValue(MinimumProperty); }
            set { SetValue(MinimumProperty, value); }
        }
        public static readonly DependencyProperty MinimumProperty =
            DependencyProperty.Register("Minimum", typeof(double), typeof(YAxisDoubles), new PropertyMetadata(0.0, (d, e) => (d as YAxisDoubles).DrawTicks()));

        /// <summary>
        /// Gets or sets the maximum value.
        /// </summary>
        public double Maximum
        {
            get { return (double)GetValue(MaximumProperty); }
            set { SetValue(MaximumProperty, value); }
        }
        public static readonly DependencyProperty MaximumProperty =
            DependencyProperty.Register("Maximum", typeof(double), typeof(YAxisDoubles), new PropertyMetadata(100.0, (d, e) => (d as YAxisDoubles).DrawTicks()));

        /// <summary>
        /// Gets or sets the string format.
        /// </summary>
        public String StringFormat
        {
            get { return (String)GetValue(StringFormatProperty); }
            set { SetValue(StringFormatProperty, value); }
        }
        public static readonly DependencyProperty StringFormatProperty =
            DependencyProperty.Register("StringFormat", typeof(String), typeof(YAxisDoubles), new PropertyMetadata(null, (d, e) => (d as YAxisDoubles).DrawTicks()));


        /// <summary>
        /// Gets or sets the label alignment.
        /// </summary>
        public HorizontalAlignment LabelAlignment
        {
            get { return (HorizontalAlignment)GetValue(LabelAlignmentProperty); }
            set { SetValue(LabelAlignmentProperty, value); }
        }
        public static readonly DependencyProperty LabelAlignmentProperty =
            DependencyProperty.Register("LabelAlignment", typeof(HorizontalAlignment), typeof(YAxisDoubles), new PropertyMetadata(HorizontalAlignment.Right, (d, e) => (d as YAxisDoubles).DrawTicks()));

        /// <summary>
        /// Gets or sets the label template.
        /// </summary>
        public DataTemplate LabelTemplate
        {
            get { return (DataTemplate)GetValue(LabelTemplateProperty); }
            set { SetValue(LabelTemplateProperty, value); }
        }
        public static readonly DependencyProperty LabelTemplateProperty =
            DependencyProperty.Register("LabelTemplate", typeof(DataTemplate), typeof(YAxisDoubles), new PropertyMetadata(null));



        /// <summary>
        /// Draws the labels.
        /// </summary>
        private void DrawTicks()
        {
            grid.RowDefinitions.Clear();
            grid.Children.Clear();
            grid.ClipToBounds = false;

            var steps = Enumerable.Range(0, Ticks)
                 .Select(i => Minimum + (Maximum - Minimum) * ((double)i / (Ticks - 1))).ToList();

            steps.Reverse();

            for (int i = 0; i < Ticks; i++)
            {
                if (i == Ticks - 1)
                {
                    var container = AddLabel(steps[i].ToString(StringFormat != null ? StringFormat : "0.0"), i);
                    container.VerticalAlignment = System.Windows.VerticalAlignment.Bottom;
                    grid.Children.Add(container);
                    container.Loaded += (x, y) =>
                    {
                        container.Margin = new Thickness(0, 0, 0, (container.ActualHeight / 2) * -1);
                    };
                }
                else
                {

                    RowDefinition row = new RowDefinition();
                    row.Height = new GridLength(1, GridUnitType.Star);
                    grid.RowDefinitions.Add(row);
                    var container = AddLabel(steps[i].ToString(StringFormat != null ? StringFormat : "0.0"), i);
                    grid.Children.Add(container);
                    container.Loaded += (x, y) =>
                    {
                        container.Margin = new Thickness(0, (container.ActualHeight / 2) * -1, 0, 0);
                    };
                }
            }
        }

        /// <summary>
        /// Adds the label.
        /// </summary>
        /// <param name="text">The text.</param>
        /// <param name="index">The index.</param>
        /// <returns></returns>
        private ContentControl AddLabel(String text, int index)
        {
            ContentControl label = new ContentControl();
            label.Content = text;
            label.ContentTemplate = LabelTemplate;
            label.VerticalAlignment = System.Windows.VerticalAlignment.Top;
            label.HorizontalAlignment = LabelAlignment;
            Grid.SetRow(label, index);
            return label;
        }
    }
}