using UnityEngine;

public class Marker3D_SetAltitude:MonoBehaviour
{
    public float altitude = 1000; // Meters
    public GameObject marker; // Prefab

    private OnlineMaps api;
    private OnlineMapsTileSetControl control;
    private int defaultZoom = 8;
    private OnlineMapsMarker3D marker3D;
    

    private void Start()
    {
        api = OnlineMaps.instance;
        control = OnlineMapsTileSetControl.instance;
        marker3D = control.AddMarker3D(OnlineMaps.instance.position, marker);

        // To prevent blink.
        marker3D.OnPositionChanged += d => LateUpdate();

        // Click on the map to get the elevation value at the point.
        control.OnMapClick += () =>
        {
            Vector3 pos = control.GetWorldPosition(control.GetCoords());
            Vector2 topLeftPosition = api.topLeftPosition;
            Vector2 bottomRightPosition = api.bottomRightPosition;
            float elevationValue = control.GetElevationValue(pos.x, pos.z, 1, topLeftPosition, bottomRightPosition);
            Debug.Log(elevationValue);
        };
    }

    private void LateUpdate()
    {
        float originalScale = 1 << defaultZoom;
        float currentScale = 1 << api.zoom;
        marker3D.scale = currentScale / originalScale;
        Vector3 pos = marker3D.instance.transform.position;
        Vector2 topLeftPosition = api.topLeftPosition;
        Vector2 bottomRightPosition = api.bottomRightPosition;
        float bestElevationYScale = control.GetBestElevationYScale(topLeftPosition, bottomRightPosition);
        pos.y = altitude * bestElevationYScale * control.elevationScale + api.transform.position.y;
        marker3D.instance.transform.position = pos;
    }
}