using UnityEngine;

public class ScenePointToRealWorldPointExample:MonoBehaviour
{
    public RealWorldTerrainContainer container;

    /// <summary>
    /// Converts scene point to real world point.
    /// </summary>
    /// <param name="container">Real World Terrain Container</param>
    /// <param name="scenePoint">Scene Point</param>
    /// <returns>Real World Point(X - Longitude, Y - Elevation, Z - Latitude)</returns>
    public static Vector3 ScenePointToRealWorldPoint(RealWorldTerrainContainer container, Vector3 scenePoint)
    {
        if (container == null) return Vector3.zero;

        Bounds bounds = new Bounds();
        bool hasBounds = false;

        foreach (RealWorldTerrainItem item in container.terrains)
        {
            if (item == null) continue;
            if (!hasBounds)
            {
                bounds = item.bounds;
                hasBounds = true;
            }
            else bounds.Encapsulate(item.bounds);
        }

        if (!hasBounds) return Vector3.zero;

        float lngScale = container.area.width / bounds.size.x;
        float latScale = -container.area.height / bounds.size.z;
        float elevationScale = (container.maxElevation - container.minElevation) / bounds.size.y;

        Debug.Log(container.maxElevation + "   " +  container.minElevation + "  " + bounds.size.y);

        Vector3 p = scenePoint - container.transform.position;

        return new Vector3(p.x * lngScale + container.area.xMin, p.y * elevationScale + container.minElevation, container.area.yMax + p.z * latScale);
    }

    private void Update()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit))
        {
            Debug.Log(ScenePointToRealWorldPoint(container, hit.point).ToString("F4"));
        }
    }
}