using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GetElevationFromGeoServerTMS : MonoBehaviour {

    public static string url =
        "[[geoserver link]]/{0}/{1}/{2}.png";

    private OnlineMapsTileSetControl control;
    List<string> tempFiles;
    [SerializeField]


    private void Start()
    {
        // Get Tileset control.
        control = OnlineMapsControlBase.instance as OnlineMapsTileSetControl;

        if (control == null)
        {
            Debug.LogError("You must use the Tileset control.");
            return;
        }


        OnlineMaps.instance.OnStartDownloadTile += OnStartDownloadTile;
    }

    private void OnStartDownloadTile(OnlineMapsTile tile)
    {
        TileRequest request = new TileRequest(tile);
        OnlineMaps.instance.StartDownloadTile(tile);
        StartCoroutine(SetElevationFromRequest(request));

    }



    IEnumerator SetElevationFromRequest(TileRequest request)
    {
        if (string.IsNullOrEmpty(request.www.error) && request.tile.status != OnlineMapsTileStatus.disposed)
        {

            while (request.www == null)
                yield return null;

            try { while (!request.www.isDone) { } } catch (Exception) { }

            byte[] bytes = request.www.bytes;

            control.SetElevationData(GetElevation(bytes));

        }

        request.Dispose();
    }

    short[,] GetElevation(byte[] bytes)
    {
        int bRef = 0;
        short[,] elevation = new short[32, 32];
        for (int width = 0; width < 16; width++)
        {
            for (int height = 0; height < 16; height++)
            {
                short val = (short)(bytes[bRef]);
                elevation[width, height] = val;
                bRef++;
            }
        }

        return elevation;
    }


    internal class TileRequest
    {
        public OnlineMapsWWW www;
        public OnlineMapsTile tile;
        public TileRequest(OnlineMapsTile tile)
        {
            url = string.Format(url, tile.zoom, tile.y, tile.x);
            www = new OnlineMapsWWW(url);
            this.tile = tile;
        }

        public void Dispose()
        {
            www.Dispose();
            www = null;
            tile = null;
        }
    }

}