using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
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.Components
{
    /// <summary>
    /// Interaction logic for YAxisLabels.xaml
    /// </summary>
    internal partial class YAxisLabels : UserControl
    {
        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="YAxisLabels"/> class.
        /// </summary>
        public YAxisLabels()
        {
            InitializeComponent();
            this.Loaded += YAxisLabels_Loaded;
        }
        
        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets the labels.
        /// </summary>
        /// <value>
        /// The labels.
        /// </value>
        public ObservableCollection<Object> Labels
        {
            get { return (ObservableCollection<Object>)GetValue(LabelsProperty); }
            set { SetValue(LabelsProperty, value); }
        }
        public static readonly DependencyProperty LabelsProperty =
            DependencyProperty.Register("Labels", typeof(ObservableCollection<Object>), typeof(YAxisLabels), new PropertyMetadata(new ObservableCollection<Object>()));

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

        #region Event Handlers

        /// <summary>
        /// Handles the Loaded event of the YAxisLabels 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 YAxisLabels_Loaded(object sender, RoutedEventArgs e)
        {
            DrawLabels();
        }
        
        #endregion

        #region Methods

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

            if (Labels == null) return;

            for (int i = 0; i < Labels.Count; i++)
            {
                if (i == Labels.Count - 1)
                {
                    var container = AddLabel(Labels[i].ToString(), 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(Labels[i].ToString(), 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.VerticalAlignment = System.Windows.VerticalAlignment.Top;
            label.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
            Grid.SetRow(label, index);

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

            return label;
        }
        
        #endregion
    }
}