using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Globalization;



namespace Microsoft.Research.DynamicDataDisplay.Charts.Maps

{

	public struct Degree : IComparable, IComparable<Degree>, IEquatable<Degree>

	{

		private readonly CoordinateType coordinateType;

		public CoordinateType CoordinateType

		{

			get { return coordinateType; }

		}



		private readonly double value;

		public double TotalDegrees

		{

			get { return value; }

		}



		public Degree(double totalDegrees)

		{

			if (Double.IsNaN(totalDegrees))

				throw new ArgumentException("Value cannot be NaN.", "totalDegrees");

			if (Math.Abs(totalDegrees) >= Int32.MaxValue)

				throw new ArgumentOutOfRangeException("totalDegrees", "Value cannot be greater than Int32.MaxValue.");



			this.value = totalDegrees;

			coordinateType = CoordinateType.Latitude;

		}



		public Degree(int degrees, int minutes, double seconds, CoordinateType coordinateType)

			: this(degrees + minutes / 60.0 + seconds / 3600.0)

		{

			if (Math.Abs(minutes) >= 60)

				throw new ArgumentOutOfRangeException("minutes");

			if (Math.Abs(seconds) >= 60.0)

				throw new ArgumentOutOfRangeException("seconds");



			this.coordinateType = coordinateType;

		}



		public Degree(double value, CoordinateType coodinateType)

			: this(value)

		{

			this.coordinateType = coodinateType;

		}



		public static Degree CreateLatitude(int degrees, int minutes)

		{

			return Degree.CreateLatitude(degrees, minutes, 0);

		}



		public static Degree CreateLongitude(int degrees, int minutes)

		{

			return Degree.CreateLongitude(degrees, minutes, 0);

		}



		public static Degree CreateLatitude(int degrees, int minutes, double seconds)

		{

			int sign = Math.Sign(degrees);

			return new Degree(degrees, sign * minutes, sign * seconds, CoordinateType.Latitude);

		}



		public static Degree CreateLongitude(int degrees, int minutes, double seconds)

		{

			int sign = Math.Sign(degrees);

			return new Degree(degrees, sign * minutes, sign * seconds, CoordinateType.Longitude);

		}



		public static Degree CreateLatitude(double value)

		{

			return new Degree(value, CoordinateType.Latitude);

		}



		public static Degree CreateLongitude(double value)

		{

			return new Degree(value, CoordinateType.Longitude);

		}



		public int Degrees

		{

			get { return (int)Math.Sign(value) * (int)Math.Floor(Math.Abs(value)); }

		}



		public int Minutes

		{

			get { return (int)Math.Floor(TotalMinutes); }

		}



		public double TotalMinutes

		{

			get

			{

				double abs = Math.Abs(value);

				double frac = abs - Math.Floor(abs);

				return frac * 60;

			}

		}



		public int Seconds

		{

			get

			{

				return (int)Math.Floor(TotalSeconds);

			}

		}



		public double TotalSeconds

		{

			get

			{

				double mins = TotalMinutes;

				double frac = mins - Math.Floor(mins);

				return frac * 60;

			}

		}



		#region IComparable Members



		public int CompareTo(object obj)

		{

			if (obj == null)

				return 1;

			if (!(obj is Degree))

				throw new ArgumentException("Argument must be Degree.", "obj");

			double otherValue = ((Degree)obj).value;



			return value.CompareTo(otherValue);

		}



		#endregion



		#region IComparable<Degree> Members



		public int CompareTo(Degree other)

		{

			return value.CompareTo(other.value);

		}



		#endregion



		#region Operators



		public static Degree operator -(Degree degree)

		{

			return new Degree(-degree.value);

		}



		public static bool operator ==(Degree left, Degree right)

		{

			return left.value == right.value;

		}



		public static bool operator !=(Degree left, Degree right)

		{

			return left.value != right.value;

		}



		#endregion



		#region IEquatable<Degree> Members



		public override bool Equals(object obj)

		{

			return (obj is Degree) && (((Degree)obj).value == value);

		}



		public override int GetHashCode()

		{

			return value.GetHashCode();

		}



		public bool Equals(Degree other)

		{

			return value == other.value;

		}



		#endregion



		public override string ToString()

		{

			return ToString("{0}° {1:0#}' {2:00.00}\" {3}");

		}



		public string ToString(string format)

		{

			if (String.IsNullOrEmpty(format))

				throw new ArgumentException("Format string cannot be null or empty.", "format");



			string typeStr = CreateTypeString();

			string str = String.Format(format, Math.Abs(Degrees), Minutes, TotalSeconds, typeStr);

			return str;

		}



		private string CreateTypeString()

		{

			CultureInfo culture = CultureInfo.CurrentCulture;



			// russian language

			if (culture.TwoLetterISOLanguageName == "ru")

			{

				if (coordinateType == CoordinateType.Latitude)

					return value >= 0 ? "с.ш." : "ю.ш.";

				else

					return value >= 0 ? "в.д." : "з.д.";

			}



			// other languages - taking English translation

			if (coordinateType == CoordinateType.Latitude)

				return value >= 0 ? "N" : "S";

			else

				return value >= 0 ? "E" : "W";

		}

	}

}