using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tango.Visuals.Components
{
    internal class PolarPoint
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="PolarPoint"/> class.
        /// </summary>
        /// <param name="radius">The radius.</param>
        /// <param name="angleDeg">Angle expressed in degrees.</param>
        /// <exception cref="ArgumentException">
        /// Radius must be non-negative
        /// or
        /// Angle must be in range [0,360)
        /// </exception>
        public PolarPoint(double radius, double angleDeg)
        {
            if (radius < 0.0)
                throw new ArgumentException("Radius must be non-negative");
            if ((angleDeg < 0) || (angleDeg >= 360.0))
                throw new ArgumentException("Angle must be in range [0,360)");

            Radius = radius;
            AngleDeg = angleDeg;
        }

        /// <summary>
        /// Gets or sets the Polar coordinates.
        /// </summary>
        /// <value>
        /// The radius.
        /// </value>
        public double Radius { get; set; }

        /// <summary>
        /// Gets or sets the angle degree.
        /// </summary>
        /// <value>
        /// The angle deg.
        /// </value>
        public double AngleDeg { get; set; }

        /// <summary>
        /// Cartesian X Coordinate.
        /// </summary>
        /// <value>
        /// The x.
        /// </value>
        public double X
        {
            get { return Radius * Math.Cos(AngleDeg * Math.PI / 180.0); }
        }

        /// <summary>
        /// Cartesian Y Coordinate.
        /// </summary>
        /// <value>
        /// The y.
        /// </value>
        public double Y
        {
            get { return Radius * Math.Sin(AngleDeg * Math.PI / 180.0); }
        }

        /// <summary>
        /// Returns a <see cref="System.String" /> that represents this instance.
        /// </summary>
        /// <returns>
        /// A <see cref="System.String" /> that represents this instance.
        /// </returns>
        public override string ToString()
        {
            return string.Format("({0},{1})", X, Y);
        }
    }
}