// ClassicalSharp copyright 2014-2016 UnknownShadow200 | Licensed under MIT
using System;
using OpenTK;

namespace ClassicalSharp.Entities {

	/// <summary> Stores data that describes either a relative position, 
	/// full position, or an orientation update for an entity. </summary>
	public struct LocationUpdate {
		
		public Vector3 Pos;
		public float Yaw, Pitch;
		
		/// <summary> Whether this update includes an absolute or relative position. </summary>
		public bool IncludesPosition;
		
		/// <summary> Whether the positon is specified as absolute (world coordinates), 
		/// or relative to the last position that was received from the server. </summary>
		public bool RelativePosition;
		
		/// <summary> Whether this update includes absolute yaw and pitch. </summary>
		public bool IncludesOrientation;
		
		public LocationUpdate(float x, float y, float z, float yaw, float pitch,
		                      bool incPos, bool relPos, bool incOri) {
			Pos = new Vector3(x, y, z);
			// Make sure yaw and pitch are in [0, 360)
			Yaw = yaw % 360;
			if (Yaw < 0) Yaw += 360;
			Pitch = pitch % 360;
			if (Pitch < 0) Pitch += 360;
			
			IncludesPosition = incPos;
			RelativePosition = relPos;
			IncludesOrientation = incOri;
		}
		
		public static LocationUpdate MakeOri(float yaw, float pitch) {
			return new LocationUpdate(0, 0, 0, yaw, pitch, false, false, true);
		}
		
		public static LocationUpdate MakePos(float x, float y, float z, bool rel) {
			return new LocationUpdate(x, y, z, 0, 0, true, rel, false);
		}
		
		public static LocationUpdate MakePos(Vector3 pos, bool rel) {
			return new LocationUpdate(pos.X, pos.Y, pos.Z, 0, 0, true, rel, false);
		}
		
		public static LocationUpdate MakePosAndOri(Vector3 v, float yaw, float pitch, bool rel) {
			return new LocationUpdate(v.X, v.Y, v.Z, yaw, pitch, true, rel, true);
		}
		
		public static LocationUpdate MakePosAndOri(float x, float y, float z, float yaw, float pitch, bool rel) {
			return new LocationUpdate(x, y, z, yaw, pitch, true, rel, true);
		}
	}
}