using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Research.DynamicDataDisplay.ViewportConstraints;
using System.Windows.Media;
using System.Windows;
using System.Windows.Data;

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
    /// <summary>
    /// Represents an axis with ticks of <see cref="System.DateTime"/> type.
    /// </summary>
    public class DateTimeAxis : AxisBase<DateTime>
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="DateTimeAxis"/> class.
        /// </summary>
        public DateTimeAxis()
            : base(new DateTimeAxisControl(), DoubleToDate,
                dt => dt.Ticks / 10000000000.0)
        {
            AxisControl.SetBinding(MajorLabelBackgroundBrushProperty, new Binding("MajorLabelBackgroundBrush") { Source = this });
            AxisControl.SetBinding(MajorLabelRectangleBorderPropertyProperty, new Binding("MajorLabelRectangleBorderProperty") { Source = this });
        }

        #region VisualProperties

        /// <summary>
        /// Gets or sets the major tick labels' background brush. This is a DependencyProperty.
        /// </summary>
        /// <value>The major label background brush.</value>
        public Brush MajorLabelBackgroundBrush
        {
            get { return (Brush)GetValue(MajorLabelBackgroundBrushProperty); }
            set { SetValue(MajorLabelBackgroundBrushProperty, value); }
        }

        public static readonly DependencyProperty MajorLabelBackgroundBrushProperty = DependencyProperty.Register(
          "MajorLabelBackgroundBrush",
          typeof(Brush),
          typeof(DateTimeAxis),
          new FrameworkPropertyMetadata(Brushes.Beige));


        public Brush MajorLabelRectangleBorderProperty
        {
            get { return (Brush)GetValue(MajorLabelRectangleBorderPropertyProperty); }
            set { SetValue(MajorLabelRectangleBorderPropertyProperty, value); }
        }

        public static readonly DependencyProperty MajorLabelRectangleBorderPropertyProperty = DependencyProperty.Register(
          "MajorLabelRectangleBorderProperty",
          typeof(Brush),
          typeof(DateTimeAxis),
          new FrameworkPropertyMetadata(Brushes.Peru));

        #endregion // end of VisualProperties

		private ViewportConstraint constraint = new DateTimeHorizontalAxisConstraint();
		protected ViewportConstraint Constraint
        {
			get { return constraint; }
            set { constraint = value; }
        }

        protected override void OnPlotterAttached(Plotter2D plotter)
        {
            base.OnPlotterAttached(plotter);

            plotter.Viewport.Constraints.Add(constraint);
        }

        protected override void OnPlotterDetaching(Plotter2D plotter)
        {
            plotter.Viewport.Constraints.Remove(constraint);

            base.OnPlotterDetaching(plotter);
        }

        private static readonly long minTicks = DateTime.MinValue.Ticks;
        private static readonly long maxTicks = DateTime.MaxValue.Ticks;
        private static DateTime DoubleToDate(double d)
        {
            long ticks = (long)(d * 10000000000L);

            // todo should we throw an exception if number of ticks is too big or small?
            if (ticks < minTicks)
                ticks = minTicks;
            else if (ticks > maxTicks)
                ticks = maxTicks;

            return new DateTime(ticks);
        }

        /// <summary>
        /// Sets conversions of axis - functions used to convert values of axis type to and from double values of viewport.
        /// Sets both ConvertToDouble and ConvertFromDouble properties.
        /// </summary>
        /// <param name="min">The minimal viewport value.</param>
        /// <param name="minValue">The value of axis type, corresponding to minimal viewport value.</param>
        /// <param name="max">The maximal viewport value.</param>
        /// <param name="maxValue">The value of axis type, corresponding to maximal viewport value.</param>
        public override void SetConversion(double min, DateTime minValue, double max, DateTime maxValue)
        {
            var conversion = new DateTimeToDoubleConversion(min, minValue, max, maxValue);

            ConvertToDouble = conversion.ToDouble;
            ConvertFromDouble = conversion.FromDouble;
        }
    }
}