using System.IO;
using UnityEngine;

public class CacheMapboxElevation: MonoBehaviour
{
    private string GetTilePath(OnlineMapsTiledElevationManager<OnlineMapsMapboxElevationManager>.Tile tile)
    {
        return Application.persistentDataPath + "/Elevation Cache/" + tile.zoom + "/" + tile.x + "/" + tile.y + ".png";
    }

    private void OnDownload(OnlineMapsTiledElevationManager<OnlineMapsMapboxElevationManager>.Tile tile)
    {
        string path = GetTilePath(tile);
        if (!File.Exists(path))
        {
            OnlineMapsMapboxElevationManager.instance.StartDownloadElevationTile(tile);
            return;
        }

        Texture2D texture = new Texture2D(256, 256);
        texture.LoadImage(File.ReadAllBytes(path));
        OnlineMapsMapboxElevationManager.instance.SetElevationTexture(tile, texture);
        OnlineMapsUtils.Destroy(texture);

        Debug.Log("Loaded from cache: " + path);
    }

    private void OnDownloadSuccess(OnlineMapsTiledElevationManager<OnlineMapsMapboxElevationManager>.Tile tile, OnlineMapsWWW www)
    {
        string path = GetTilePath(tile);
        FileInfo info = new FileInfo(path);
        if (!info.Directory.Exists) info.Directory.Create();
        File.WriteAllBytes(path, www.bytes);

        Debug.Log("Elevation saved: " + path);
    }

    private void Start()
    {
        OnlineMapsMapboxElevationManager.instance.OnDownload += OnDownload;
        OnlineMapsMapboxElevationManager.instance.OnDownloadSuccess += OnDownloadSuccess;
    }
}