using UnityEngine;

public class TestESRIElevations : MonoBehaviour
{
    private OnlineMapsWWW www;

    private void Start ()
    {
	    OnlineMapsTileSetControl.instance.OnGetElevation += OnGetElevation;
	}

    private void OnGetElevation(Vector2 topLeft, Vector2 bottomRight)
    {
        www = OnlineMapsUtils.GetWWW("http://sampleserver4.arcgisonline.com/ArcGIS/rest/services/Elevation/ESRI_Elevation_World/MapServer/exts/ElevationsSOE/ElevationLayers/1/GetElevationData?f=json&Extent={%22spatialReference%22:{%22wkid%22:4326},%22ymin%22:" + bottomRight.y + ",%22ymax%22:" + topLeft.y + ",%22xmin%22:" + topLeft.x + ",%22xmax%22:" + bottomRight.x + "}&Rows=32&Columns=32");
    }

    private void Update()
    {
        if (www != null && www.isDone)
        {
            if (!string.IsNullOrEmpty(www.error))
            {
                Debug.Log(www.error);
                www = null;
                return;
            }
            string r = www.text;
            www = null;
            int dataIndex = r.IndexOf("\"data\":[");
            if (dataIndex == -1)
            {
                Debug.Log("Something wrong");
                Debug.Log(r);
                return;
            }
            dataIndex += 8;

            short[,] elevationData = new short[32, 32];

            int index = 0;
            int v = 0;
            bool isNegative = false;

            for (int i = dataIndex; i < r.Length; i++)
            {
                char c = r[i];
                if (c == ',')
                {
                    int x = index % 32;
                    int y = 31 - index / 32;
                    if (isNegative) v = -v;
                    elevationData[x, y] = (short) v;
                    v = 0;
                    isNegative = false;
                    index++;
                }
                else if (c == '-') isNegative = true;
                else if (c > 47 && c < 58) v = v * 10 + (c - 48);
                else break;
            }

            OnlineMapsTileSetControl.instance.SetElevationData(elevationData);
        }
    }
}