/*     INFINITY CODE 2013-2016      */
/*   http://www.infinity-code.com   */

using UnityEngine;

namespace InfinityCode.OnlineMapsExamples
{
	[AddComponentMenu("Infinity Code/Online Maps/Examples (API Usage)/SmoothMoveExample")]
	public class SmoothMove : MonoBehaviour
	{
		/// <summary>
		/// Move duration (sec)
		/// </summary>
		public float time = 3;

		/// <summary>
		/// Relative position (0-1) between from and to
		/// </summary>
		private float angle;

		/// <summary>
		/// Movement trigger
		/// </summary>
		private bool isMovement;

		private Vector2 fromPosition;
		private Vector2 toPosition;

		private OnlineMapsMarker marker;

		private void Start(){
			OnlineMaps api = OnlineMaps.instance;
			marker = api.AddMarker(api.position);
			// Subscribe to UpdateBefore event.
//			OnlineMapsLocationService.instance.OnCompassChanged += OnCompassChanged;


			// Create a new marker.
			marker = OnlineMaps.instance.AddMarker(new Vector2(), "Player");

			// Subscribe to UpdateBefore event.
			OnlineMaps.instance.OnUpdateBefore += OnUpdateBefore; 
		}


		private void Update()
		{
			moveCenter ();

		}

		private void LateUpdate(){
			// if not movement then return
			if (!isMovement) return;

			// update relative position
			angle += Time.deltaTime / time;

			if (angle > 1)
			{
				// stop movement
				isMovement = false;
				angle = 1;
			}

			// Set new position
			OnlineMaps.instance.position = Vector2.Lerp(fromPosition, toPosition, angle);
			marker.position = Vector2.Lerp(fromPosition, toPosition, angle);
		}


		private Vector2 getCurrentMapPosition(){
			// from current map position
			fromPosition = OnlineMaps.instance.position;
			return fromPosition;
		}

		private Vector2 getCurrentGPSPosition(){
			// to GPS position;
			toPosition = OnlineMaps.instance.GetComponent<OnlineMapsLocationService>().position;
			return toPosition;
		}

		private Vector2 calculateCurrentTilePosition(){
			Vector2 fromTile = OnlineMapsUtils.LatLongToTilef(getCurrentMapPosition(), OnlineMaps.instance.zoom);
			return fromTile;
		}

		private Vector2 calculateNewTilePosition(){
			Vector2 toTile = OnlineMapsUtils.LatLongToTilef(getCurrentGPSPosition(), OnlineMaps.instance.zoom);
			return toTile;
		}

		private float setAngleToZero(){
			// set relative position 0
			return angle = 0;
		}

		private void moveCenterWhenMovementIsFar(){
			OnlineMaps.instance.position = getCurrentGPSPosition();
		}


		private void moveCenter(){

			// On click button, starts movement
			if (getCurrentMapPosition() != getCurrentGPSPosition())
			{
				// if tile offset < 4, then start smooth movement
				if ((calculateCurrentTilePosition() - calculateNewTilePosition()).magnitude < 4)
				{
					// set relative position 0
					setAngleToZero ();

					// start movement
					isMovement = true;
				}
				else // too far
				{
					moveCenterWhenMovementIsFar ();
				}
			}
		}

//		private void OnCompassChanged(float f)
//		{
//			OnlineMapsTileSetControl.instance.cameraRotation.y = f * 360;
//		}

		private void OnUpdateBefore()
		{
			// Update camera rotation
			OnlineMapsTileSetControl.instance.cameraRotation = new Vector2(0, marker.rotation * 360);
		}

		//End Class
	}
}